mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Like Xu](/assets/img/avatar_default.png)
The header lapic.h is included more than once, remove one of them. Signed-off-by: Like Xu <likexu@tencent.com> Message-Id: <20220406063715.55625-2-likexu@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1857 lines
50 KiB
C
1857 lines
50 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
|
|
* Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
*
|
|
* KVM Xen emulation
|
|
*/
|
|
|
|
#include "x86.h"
|
|
#include "xen.h"
|
|
#include "hyperv.h"
|
|
#include "lapic.h"
|
|
|
|
#include <linux/eventfd.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/sched/stat.h>
|
|
|
|
#include <trace/events/kvm.h>
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/interface/vcpu.h>
|
|
#include <xen/interface/version.h>
|
|
#include <xen/interface/event_channel.h>
|
|
#include <xen/interface/sched.h>
|
|
|
|
#include "trace.h"
|
|
|
|
static int kvm_xen_set_evtchn(struct kvm_xen_evtchn *xe, struct kvm *kvm);
|
|
static int kvm_xen_setattr_evtchn(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
|
|
static bool kvm_xen_hcall_evtchn_send(struct kvm_vcpu *vcpu, u64 param, u64 *r);
|
|
|
|
DEFINE_STATIC_KEY_DEFERRED_FALSE(kvm_xen_enabled, HZ);
|
|
|
|
static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn)
|
|
{
|
|
struct gfn_to_pfn_cache *gpc = &kvm->arch.xen.shinfo_cache;
|
|
struct pvclock_wall_clock *wc;
|
|
gpa_t gpa = gfn_to_gpa(gfn);
|
|
u32 *wc_sec_hi;
|
|
u32 wc_version;
|
|
u64 wall_nsec;
|
|
int ret = 0;
|
|
int idx = srcu_read_lock(&kvm->srcu);
|
|
|
|
if (gfn == GPA_INVALID) {
|
|
kvm_gfn_to_pfn_cache_destroy(kvm, gpc);
|
|
goto out;
|
|
}
|
|
|
|
do {
|
|
ret = kvm_gfn_to_pfn_cache_init(kvm, gpc, NULL, KVM_HOST_USES_PFN,
|
|
gpa, PAGE_SIZE);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* This code mirrors kvm_write_wall_clock() except that it writes
|
|
* directly through the pfn cache and doesn't mark the page dirty.
|
|
*/
|
|
wall_nsec = ktime_get_real_ns() - get_kvmclock_ns(kvm);
|
|
|
|
/* It could be invalid again already, so we need to check */
|
|
read_lock_irq(&gpc->lock);
|
|
|
|
if (gpc->valid)
|
|
break;
|
|
|
|
read_unlock_irq(&gpc->lock);
|
|
} while (1);
|
|
|
|
/* Paranoia checks on the 32-bit struct layout */
|
|
BUILD_BUG_ON(offsetof(struct compat_shared_info, wc) != 0x900);
|
|
BUILD_BUG_ON(offsetof(struct compat_shared_info, arch.wc_sec_hi) != 0x924);
|
|
BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* Paranoia checks on the 64-bit struct layout */
|
|
BUILD_BUG_ON(offsetof(struct shared_info, wc) != 0xc00);
|
|
BUILD_BUG_ON(offsetof(struct shared_info, wc_sec_hi) != 0xc0c);
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) {
|
|
struct shared_info *shinfo = gpc->khva;
|
|
|
|
wc_sec_hi = &shinfo->wc_sec_hi;
|
|
wc = &shinfo->wc;
|
|
} else
|
|
#endif
|
|
{
|
|
struct compat_shared_info *shinfo = gpc->khva;
|
|
|
|
wc_sec_hi = &shinfo->arch.wc_sec_hi;
|
|
wc = &shinfo->wc;
|
|
}
|
|
|
|
/* Increment and ensure an odd value */
|
|
wc_version = wc->version = (wc->version + 1) | 1;
|
|
smp_wmb();
|
|
|
|
wc->nsec = do_div(wall_nsec, 1000000000);
|
|
wc->sec = (u32)wall_nsec;
|
|
*wc_sec_hi = wall_nsec >> 32;
|
|
smp_wmb();
|
|
|
|
wc->version = wc_version + 1;
|
|
read_unlock_irq(&gpc->lock);
|
|
|
|
kvm_make_all_cpus_request(kvm, KVM_REQ_MASTERCLOCK_UPDATE);
|
|
|
|
out:
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
return ret;
|
|
}
|
|
|
|
void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (atomic_read(&vcpu->arch.xen.timer_pending) > 0) {
|
|
struct kvm_xen_evtchn e;
|
|
|
|
e.vcpu_id = vcpu->vcpu_id;
|
|
e.vcpu_idx = vcpu->vcpu_idx;
|
|
e.port = vcpu->arch.xen.timer_virq;
|
|
e.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
|
|
|
|
kvm_xen_set_evtchn(&e, vcpu->kvm);
|
|
|
|
vcpu->arch.xen.timer_expires = 0;
|
|
atomic_set(&vcpu->arch.xen.timer_pending, 0);
|
|
}
|
|
}
|
|
|
|
static enum hrtimer_restart xen_timer_callback(struct hrtimer *timer)
|
|
{
|
|
struct kvm_vcpu *vcpu = container_of(timer, struct kvm_vcpu,
|
|
arch.xen.timer);
|
|
if (atomic_read(&vcpu->arch.xen.timer_pending))
|
|
return HRTIMER_NORESTART;
|
|
|
|
atomic_inc(&vcpu->arch.xen.timer_pending);
|
|
kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
|
|
kvm_vcpu_kick(vcpu);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static void kvm_xen_start_timer(struct kvm_vcpu *vcpu, u64 guest_abs, s64 delta_ns)
|
|
{
|
|
atomic_set(&vcpu->arch.xen.timer_pending, 0);
|
|
vcpu->arch.xen.timer_expires = guest_abs;
|
|
|
|
if (delta_ns <= 0) {
|
|
xen_timer_callback(&vcpu->arch.xen.timer);
|
|
} else {
|
|
ktime_t ktime_now = ktime_get();
|
|
hrtimer_start(&vcpu->arch.xen.timer,
|
|
ktime_add_ns(ktime_now, delta_ns),
|
|
HRTIMER_MODE_ABS_HARD);
|
|
}
|
|
}
|
|
|
|
static void kvm_xen_stop_timer(struct kvm_vcpu *vcpu)
|
|
{
|
|
hrtimer_cancel(&vcpu->arch.xen.timer);
|
|
vcpu->arch.xen.timer_expires = 0;
|
|
atomic_set(&vcpu->arch.xen.timer_pending, 0);
|
|
}
|
|
|
|
static void kvm_xen_init_timer(struct kvm_vcpu *vcpu)
|
|
{
|
|
hrtimer_init(&vcpu->arch.xen.timer, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_ABS_HARD);
|
|
vcpu->arch.xen.timer.function = xen_timer_callback;
|
|
}
|
|
|
|
static void kvm_xen_update_runstate(struct kvm_vcpu *v, int state)
|
|
{
|
|
struct kvm_vcpu_xen *vx = &v->arch.xen;
|
|
u64 now = get_kvmclock_ns(v->kvm);
|
|
u64 delta_ns = now - vx->runstate_entry_time;
|
|
u64 run_delay = current->sched_info.run_delay;
|
|
|
|
if (unlikely(!vx->runstate_entry_time))
|
|
vx->current_runstate = RUNSTATE_offline;
|
|
|
|
/*
|
|
* Time waiting for the scheduler isn't "stolen" if the
|
|
* vCPU wasn't running anyway.
|
|
*/
|
|
if (vx->current_runstate == RUNSTATE_running) {
|
|
u64 steal_ns = run_delay - vx->last_steal;
|
|
|
|
delta_ns -= steal_ns;
|
|
|
|
vx->runstate_times[RUNSTATE_runnable] += steal_ns;
|
|
}
|
|
vx->last_steal = run_delay;
|
|
|
|
vx->runstate_times[vx->current_runstate] += delta_ns;
|
|
vx->current_runstate = state;
|
|
vx->runstate_entry_time = now;
|
|
}
|
|
|
|
void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, int state)
|
|
{
|
|
struct kvm_vcpu_xen *vx = &v->arch.xen;
|
|
struct gfn_to_pfn_cache *gpc = &vx->runstate_cache;
|
|
uint64_t *user_times;
|
|
unsigned long flags;
|
|
size_t user_len;
|
|
int *user_state;
|
|
|
|
kvm_xen_update_runstate(v, state);
|
|
|
|
if (!vx->runstate_cache.active)
|
|
return;
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode)
|
|
user_len = sizeof(struct vcpu_runstate_info);
|
|
else
|
|
user_len = sizeof(struct compat_vcpu_runstate_info);
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa,
|
|
user_len)) {
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
/* When invoked from kvm_sched_out() we cannot sleep */
|
|
if (state == RUNSTATE_runnable)
|
|
return;
|
|
|
|
if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa, user_len))
|
|
return;
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* The only difference between 32-bit and 64-bit versions of the
|
|
* runstate struct us the alignment of uint64_t in 32-bit, which
|
|
* means that the 64-bit version has an additional 4 bytes of
|
|
* padding after the first field 'state'.
|
|
*
|
|
* So we use 'int __user *user_state' to point to the state field,
|
|
* and 'uint64_t __user *user_times' for runstate_entry_time. So
|
|
* the actual array of time[] in each state starts at user_times[1].
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) != 0);
|
|
BUILD_BUG_ON(offsetof(struct compat_vcpu_runstate_info, state) != 0);
|
|
BUILD_BUG_ON(sizeof(struct compat_vcpu_runstate_info) != 0x2c);
|
|
#ifdef CONFIG_X86_64
|
|
BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) !=
|
|
offsetof(struct compat_vcpu_runstate_info, state_entry_time) + 4);
|
|
BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, time) !=
|
|
offsetof(struct compat_vcpu_runstate_info, time) + 4);
|
|
#endif
|
|
|
|
user_state = gpc->khva;
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode)
|
|
user_times = gpc->khva + offsetof(struct vcpu_runstate_info,
|
|
state_entry_time);
|
|
else
|
|
user_times = gpc->khva + offsetof(struct compat_vcpu_runstate_info,
|
|
state_entry_time);
|
|
|
|
/*
|
|
* First write the updated state_entry_time at the appropriate
|
|
* location determined by 'offset'.
|
|
*/
|
|
BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, state_entry_time) !=
|
|
sizeof(user_times[0]));
|
|
BUILD_BUG_ON(sizeof_field(struct compat_vcpu_runstate_info, state_entry_time) !=
|
|
sizeof(user_times[0]));
|
|
|
|
user_times[0] = vx->runstate_entry_time | XEN_RUNSTATE_UPDATE;
|
|
smp_wmb();
|
|
|
|
/*
|
|
* Next, write the new runstate. This is in the *same* place
|
|
* for 32-bit and 64-bit guests, asserted here for paranoia.
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) !=
|
|
offsetof(struct compat_vcpu_runstate_info, state));
|
|
BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, state) !=
|
|
sizeof(vx->current_runstate));
|
|
BUILD_BUG_ON(sizeof_field(struct compat_vcpu_runstate_info, state) !=
|
|
sizeof(vx->current_runstate));
|
|
|
|
*user_state = vx->current_runstate;
|
|
|
|
/*
|
|
* Write the actual runstate times immediately after the
|
|
* runstate_entry_time.
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) !=
|
|
offsetof(struct vcpu_runstate_info, time) - sizeof(u64));
|
|
BUILD_BUG_ON(offsetof(struct compat_vcpu_runstate_info, state_entry_time) !=
|
|
offsetof(struct compat_vcpu_runstate_info, time) - sizeof(u64));
|
|
BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, time) !=
|
|
sizeof_field(struct compat_vcpu_runstate_info, time));
|
|
BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, time) !=
|
|
sizeof(vx->runstate_times));
|
|
|
|
memcpy(user_times + 1, vx->runstate_times, sizeof(vx->runstate_times));
|
|
smp_wmb();
|
|
|
|
/*
|
|
* Finally, clear the XEN_RUNSTATE_UPDATE bit in the guest's
|
|
* runstate_entry_time field.
|
|
*/
|
|
user_times[0] &= ~XEN_RUNSTATE_UPDATE;
|
|
smp_wmb();
|
|
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
|
|
}
|
|
|
|
static void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *v)
|
|
{
|
|
struct kvm_lapic_irq irq = { };
|
|
int r;
|
|
|
|
irq.dest_id = v->vcpu_id;
|
|
irq.vector = v->arch.xen.upcall_vector;
|
|
irq.dest_mode = APIC_DEST_PHYSICAL;
|
|
irq.shorthand = APIC_DEST_NOSHORT;
|
|
irq.delivery_mode = APIC_DM_FIXED;
|
|
irq.level = 1;
|
|
|
|
/* The fast version will always work for physical unicast */
|
|
WARN_ON_ONCE(!kvm_irq_delivery_to_apic_fast(v->kvm, NULL, &irq, &r, NULL));
|
|
}
|
|
|
|
/*
|
|
* On event channel delivery, the vcpu_info may not have been accessible.
|
|
* In that case, there are bits in vcpu->arch.xen.evtchn_pending_sel which
|
|
* need to be marked into the vcpu_info (and evtchn_upcall_pending set).
|
|
* Do so now that we can sleep in the context of the vCPU to bring the
|
|
* page in, and refresh the pfn cache for it.
|
|
*/
|
|
void kvm_xen_inject_pending_events(struct kvm_vcpu *v)
|
|
{
|
|
unsigned long evtchn_pending_sel = READ_ONCE(v->arch.xen.evtchn_pending_sel);
|
|
struct gfn_to_pfn_cache *gpc = &v->arch.xen.vcpu_info_cache;
|
|
unsigned long flags;
|
|
|
|
if (!evtchn_pending_sel)
|
|
return;
|
|
|
|
/*
|
|
* Yes, this is an open-coded loop. But that's just what put_user()
|
|
* does anyway. Page it in and retry the instruction. We're just a
|
|
* little more honest about it.
|
|
*/
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa,
|
|
sizeof(struct vcpu_info))) {
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa,
|
|
sizeof(struct vcpu_info)))
|
|
return;
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
}
|
|
|
|
/* Now gpc->khva is a valid kernel address for the vcpu_info */
|
|
if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode) {
|
|
struct vcpu_info *vi = gpc->khva;
|
|
|
|
asm volatile(LOCK_PREFIX "orq %0, %1\n"
|
|
"notq %0\n"
|
|
LOCK_PREFIX "andq %0, %2\n"
|
|
: "=r" (evtchn_pending_sel),
|
|
"+m" (vi->evtchn_pending_sel),
|
|
"+m" (v->arch.xen.evtchn_pending_sel)
|
|
: "0" (evtchn_pending_sel));
|
|
WRITE_ONCE(vi->evtchn_upcall_pending, 1);
|
|
} else {
|
|
u32 evtchn_pending_sel32 = evtchn_pending_sel;
|
|
struct compat_vcpu_info *vi = gpc->khva;
|
|
|
|
asm volatile(LOCK_PREFIX "orl %0, %1\n"
|
|
"notl %0\n"
|
|
LOCK_PREFIX "andl %0, %2\n"
|
|
: "=r" (evtchn_pending_sel32),
|
|
"+m" (vi->evtchn_pending_sel),
|
|
"+m" (v->arch.xen.evtchn_pending_sel)
|
|
: "0" (evtchn_pending_sel32));
|
|
WRITE_ONCE(vi->evtchn_upcall_pending, 1);
|
|
}
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
/* For the per-vCPU lapic vector, deliver it as MSI. */
|
|
if (v->arch.xen.upcall_vector)
|
|
kvm_xen_inject_vcpu_vector(v);
|
|
|
|
mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
|
|
}
|
|
|
|
int __kvm_xen_has_interrupt(struct kvm_vcpu *v)
|
|
{
|
|
struct gfn_to_pfn_cache *gpc = &v->arch.xen.vcpu_info_cache;
|
|
unsigned long flags;
|
|
u8 rc = 0;
|
|
|
|
/*
|
|
* If the global upcall vector (HVMIRQ_callback_vector) is set and
|
|
* the vCPU's evtchn_upcall_pending flag is set, the IRQ is pending.
|
|
*/
|
|
|
|
/* No need for compat handling here */
|
|
BUILD_BUG_ON(offsetof(struct vcpu_info, evtchn_upcall_pending) !=
|
|
offsetof(struct compat_vcpu_info, evtchn_upcall_pending));
|
|
BUILD_BUG_ON(sizeof(rc) !=
|
|
sizeof_field(struct vcpu_info, evtchn_upcall_pending));
|
|
BUILD_BUG_ON(sizeof(rc) !=
|
|
sizeof_field(struct compat_vcpu_info, evtchn_upcall_pending));
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa,
|
|
sizeof(struct vcpu_info))) {
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
/*
|
|
* This function gets called from kvm_vcpu_block() after setting the
|
|
* task to TASK_INTERRUPTIBLE, to see if it needs to wake immediately
|
|
* from a HLT. So we really mustn't sleep. If the page ended up absent
|
|
* at that point, just return 1 in order to trigger an immediate wake,
|
|
* and we'll end up getting called again from a context where we *can*
|
|
* fault in the page and wait for it.
|
|
*/
|
|
if (in_atomic() || !task_is_running(current))
|
|
return 1;
|
|
|
|
if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa,
|
|
sizeof(struct vcpu_info))) {
|
|
/*
|
|
* If this failed, userspace has screwed up the
|
|
* vcpu_info mapping. No interrupts for you.
|
|
*/
|
|
return 0;
|
|
}
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
}
|
|
|
|
rc = ((struct vcpu_info *)gpc->khva)->evtchn_upcall_pending;
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
return rc;
|
|
}
|
|
|
|
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
|
|
{
|
|
int r = -ENOENT;
|
|
|
|
|
|
switch (data->type) {
|
|
case KVM_XEN_ATTR_TYPE_LONG_MODE:
|
|
if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode) {
|
|
r = -EINVAL;
|
|
} else {
|
|
mutex_lock(&kvm->lock);
|
|
kvm->arch.xen.long_mode = !!data->u.long_mode;
|
|
mutex_unlock(&kvm->lock);
|
|
r = 0;
|
|
}
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_SHARED_INFO:
|
|
mutex_lock(&kvm->lock);
|
|
r = kvm_xen_shared_info_init(kvm, data->u.shared_info.gfn);
|
|
mutex_unlock(&kvm->lock);
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_UPCALL_VECTOR:
|
|
if (data->u.vector && data->u.vector < 0x10)
|
|
r = -EINVAL;
|
|
else {
|
|
mutex_lock(&kvm->lock);
|
|
kvm->arch.xen.upcall_vector = data->u.vector;
|
|
mutex_unlock(&kvm->lock);
|
|
r = 0;
|
|
}
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_EVTCHN:
|
|
r = kvm_xen_setattr_evtchn(kvm, data);
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_XEN_VERSION:
|
|
mutex_lock(&kvm->lock);
|
|
kvm->arch.xen.xen_version = data->u.xen_version;
|
|
mutex_unlock(&kvm->lock);
|
|
r = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
|
|
{
|
|
int r = -ENOENT;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
switch (data->type) {
|
|
case KVM_XEN_ATTR_TYPE_LONG_MODE:
|
|
data->u.long_mode = kvm->arch.xen.long_mode;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_SHARED_INFO:
|
|
if (kvm->arch.xen.shinfo_cache.active)
|
|
data->u.shared_info.gfn = gpa_to_gfn(kvm->arch.xen.shinfo_cache.gpa);
|
|
else
|
|
data->u.shared_info.gfn = GPA_INVALID;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_UPCALL_VECTOR:
|
|
data->u.vector = kvm->arch.xen.upcall_vector;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_ATTR_TYPE_XEN_VERSION:
|
|
data->u.xen_version = kvm->arch.xen.xen_version;
|
|
r = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
|
|
{
|
|
int idx, r = -ENOENT;
|
|
|
|
mutex_lock(&vcpu->kvm->lock);
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
|
|
switch (data->type) {
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO:
|
|
/* No compat necessary here. */
|
|
BUILD_BUG_ON(sizeof(struct vcpu_info) !=
|
|
sizeof(struct compat_vcpu_info));
|
|
BUILD_BUG_ON(offsetof(struct vcpu_info, time) !=
|
|
offsetof(struct compat_vcpu_info, time));
|
|
|
|
if (data->u.gpa == GPA_INVALID) {
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm, &vcpu->arch.xen.vcpu_info_cache);
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
r = kvm_gfn_to_pfn_cache_init(vcpu->kvm,
|
|
&vcpu->arch.xen.vcpu_info_cache,
|
|
NULL, KVM_HOST_USES_PFN, data->u.gpa,
|
|
sizeof(struct vcpu_info));
|
|
if (!r)
|
|
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
|
|
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO:
|
|
if (data->u.gpa == GPA_INVALID) {
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,
|
|
&vcpu->arch.xen.vcpu_time_info_cache);
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
r = kvm_gfn_to_pfn_cache_init(vcpu->kvm,
|
|
&vcpu->arch.xen.vcpu_time_info_cache,
|
|
NULL, KVM_HOST_USES_PFN, data->u.gpa,
|
|
sizeof(struct pvclock_vcpu_time_info));
|
|
if (!r)
|
|
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (data->u.gpa == GPA_INVALID) {
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,
|
|
&vcpu->arch.xen.runstate_cache);
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
r = kvm_gfn_to_pfn_cache_init(vcpu->kvm,
|
|
&vcpu->arch.xen.runstate_cache,
|
|
NULL, KVM_HOST_USES_PFN, data->u.gpa,
|
|
sizeof(struct vcpu_runstate_info));
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (data->u.runstate.state > RUNSTATE_offline) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
kvm_xen_update_runstate(vcpu, data->u.runstate.state);
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (data->u.runstate.state > RUNSTATE_offline) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
if (data->u.runstate.state_entry_time !=
|
|
(data->u.runstate.time_running +
|
|
data->u.runstate.time_runnable +
|
|
data->u.runstate.time_blocked +
|
|
data->u.runstate.time_offline)) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
if (get_kvmclock_ns(vcpu->kvm) <
|
|
data->u.runstate.state_entry_time) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
vcpu->arch.xen.current_runstate = data->u.runstate.state;
|
|
vcpu->arch.xen.runstate_entry_time =
|
|
data->u.runstate.state_entry_time;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_running] =
|
|
data->u.runstate.time_running;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_runnable] =
|
|
data->u.runstate.time_runnable;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_blocked] =
|
|
data->u.runstate.time_blocked;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_offline] =
|
|
data->u.runstate.time_offline;
|
|
vcpu->arch.xen.last_steal = current->sched_info.run_delay;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (data->u.runstate.state > RUNSTATE_offline &&
|
|
data->u.runstate.state != (u64)-1) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
/* The adjustment must add up */
|
|
if (data->u.runstate.state_entry_time !=
|
|
(data->u.runstate.time_running +
|
|
data->u.runstate.time_runnable +
|
|
data->u.runstate.time_blocked +
|
|
data->u.runstate.time_offline)) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (get_kvmclock_ns(vcpu->kvm) <
|
|
(vcpu->arch.xen.runstate_entry_time +
|
|
data->u.runstate.state_entry_time)) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
vcpu->arch.xen.runstate_entry_time +=
|
|
data->u.runstate.state_entry_time;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_running] +=
|
|
data->u.runstate.time_running;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_runnable] +=
|
|
data->u.runstate.time_runnable;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_blocked] +=
|
|
data->u.runstate.time_blocked;
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_offline] +=
|
|
data->u.runstate.time_offline;
|
|
|
|
if (data->u.runstate.state <= RUNSTATE_offline)
|
|
kvm_xen_update_runstate(vcpu, data->u.runstate.state);
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID:
|
|
if (data->u.vcpu_id >= KVM_MAX_VCPUS)
|
|
r = -EINVAL;
|
|
else {
|
|
vcpu->arch.xen.vcpu_id = data->u.vcpu_id;
|
|
r = 0;
|
|
}
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_TIMER:
|
|
if (data->u.timer.port) {
|
|
if (data->u.timer.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
vcpu->arch.xen.timer_virq = data->u.timer.port;
|
|
kvm_xen_init_timer(vcpu);
|
|
|
|
/* Restart the timer if it's set */
|
|
if (data->u.timer.expires_ns)
|
|
kvm_xen_start_timer(vcpu, data->u.timer.expires_ns,
|
|
data->u.timer.expires_ns -
|
|
get_kvmclock_ns(vcpu->kvm));
|
|
} else if (kvm_xen_timer_enabled(vcpu)) {
|
|
kvm_xen_stop_timer(vcpu);
|
|
vcpu->arch.xen.timer_virq = 0;
|
|
}
|
|
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR:
|
|
if (data->u.vector && data->u.vector < 0x10)
|
|
r = -EINVAL;
|
|
else {
|
|
vcpu->arch.xen.upcall_vector = data->u.vector;
|
|
r = 0;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
mutex_unlock(&vcpu->kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
|
|
{
|
|
int r = -ENOENT;
|
|
|
|
mutex_lock(&vcpu->kvm->lock);
|
|
|
|
switch (data->type) {
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO:
|
|
if (vcpu->arch.xen.vcpu_info_cache.active)
|
|
data->u.gpa = vcpu->arch.xen.vcpu_info_cache.gpa;
|
|
else
|
|
data->u.gpa = GPA_INVALID;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO:
|
|
if (vcpu->arch.xen.vcpu_time_info_cache.active)
|
|
data->u.gpa = vcpu->arch.xen.vcpu_time_info_cache.gpa;
|
|
else
|
|
data->u.gpa = GPA_INVALID;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if (vcpu->arch.xen.runstate_cache.active) {
|
|
data->u.gpa = vcpu->arch.xen.runstate_cache.gpa;
|
|
r = 0;
|
|
}
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
data->u.runstate.state = vcpu->arch.xen.current_runstate;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_DATA:
|
|
if (!sched_info_on()) {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
data->u.runstate.state = vcpu->arch.xen.current_runstate;
|
|
data->u.runstate.state_entry_time =
|
|
vcpu->arch.xen.runstate_entry_time;
|
|
data->u.runstate.time_running =
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_running];
|
|
data->u.runstate.time_runnable =
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_runnable];
|
|
data->u.runstate.time_blocked =
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_blocked];
|
|
data->u.runstate.time_offline =
|
|
vcpu->arch.xen.runstate_times[RUNSTATE_offline];
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST:
|
|
r = -EINVAL;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID:
|
|
data->u.vcpu_id = vcpu->arch.xen.vcpu_id;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_TIMER:
|
|
data->u.timer.port = vcpu->arch.xen.timer_virq;
|
|
data->u.timer.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
|
|
data->u.timer.expires_ns = vcpu->arch.xen.timer_expires;
|
|
r = 0;
|
|
break;
|
|
|
|
case KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR:
|
|
data->u.vector = vcpu->arch.xen.upcall_vector;
|
|
r = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&vcpu->kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
u32 page_num = data & ~PAGE_MASK;
|
|
u64 page_addr = data & PAGE_MASK;
|
|
bool lm = is_long_mode(vcpu);
|
|
|
|
/* Latch long_mode for shared_info pages etc. */
|
|
vcpu->kvm->arch.xen.long_mode = lm;
|
|
|
|
/*
|
|
* If Xen hypercall intercept is enabled, fill the hypercall
|
|
* page with VMCALL/VMMCALL instructions since that's what
|
|
* we catch. Else the VMM has provided the hypercall pages
|
|
* with instructions of its own choosing, so use those.
|
|
*/
|
|
if (kvm_xen_hypercall_enabled(kvm)) {
|
|
u8 instructions[32];
|
|
int i;
|
|
|
|
if (page_num)
|
|
return 1;
|
|
|
|
/* mov imm32, %eax */
|
|
instructions[0] = 0xb8;
|
|
|
|
/* vmcall / vmmcall */
|
|
static_call(kvm_x86_patch_hypercall)(vcpu, instructions + 5);
|
|
|
|
/* ret */
|
|
instructions[8] = 0xc3;
|
|
|
|
/* int3 to pad */
|
|
memset(instructions + 9, 0xcc, sizeof(instructions) - 9);
|
|
|
|
for (i = 0; i < PAGE_SIZE / sizeof(instructions); i++) {
|
|
*(u32 *)&instructions[1] = i;
|
|
if (kvm_vcpu_write_guest(vcpu,
|
|
page_addr + (i * sizeof(instructions)),
|
|
instructions, sizeof(instructions)))
|
|
return 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* Note, truncation is a non-issue as 'lm' is guaranteed to be
|
|
* false for a 32-bit kernel, i.e. when hva_t is only 4 bytes.
|
|
*/
|
|
hva_t blob_addr = lm ? kvm->arch.xen_hvm_config.blob_addr_64
|
|
: kvm->arch.xen_hvm_config.blob_addr_32;
|
|
u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
|
|
: kvm->arch.xen_hvm_config.blob_size_32;
|
|
u8 *page;
|
|
|
|
if (page_num >= blob_size)
|
|
return 1;
|
|
|
|
blob_addr += page_num * PAGE_SIZE;
|
|
|
|
page = memdup_user((u8 __user *)blob_addr, PAGE_SIZE);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) {
|
|
kfree(page);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc)
|
|
{
|
|
/* Only some feature flags need to be *enabled* by userspace */
|
|
u32 permitted_flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL |
|
|
KVM_XEN_HVM_CONFIG_EVTCHN_SEND;
|
|
|
|
if (xhc->flags & ~permitted_flags)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* With hypercall interception the kernel generates its own
|
|
* hypercall page so it must not be provided.
|
|
*/
|
|
if ((xhc->flags & KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL) &&
|
|
(xhc->blob_addr_32 || xhc->blob_addr_64 ||
|
|
xhc->blob_size_32 || xhc->blob_size_64))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
if (xhc->msr && !kvm->arch.xen_hvm_config.msr)
|
|
static_branch_inc(&kvm_xen_enabled.key);
|
|
else if (!xhc->msr && kvm->arch.xen_hvm_config.msr)
|
|
static_branch_slow_dec_deferred(&kvm_xen_enabled);
|
|
|
|
memcpy(&kvm->arch.xen_hvm_config, xhc, sizeof(*xhc));
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_xen_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
|
|
{
|
|
kvm_rax_write(vcpu, result);
|
|
return kvm_skip_emulated_instruction(vcpu);
|
|
}
|
|
|
|
static int kvm_xen_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_run *run = vcpu->run;
|
|
|
|
if (unlikely(!kvm_is_linear_rip(vcpu, vcpu->arch.xen.hypercall_rip)))
|
|
return 1;
|
|
|
|
return kvm_xen_hypercall_set_result(vcpu, run->xen.u.hcall.result);
|
|
}
|
|
|
|
static bool wait_pending_event(struct kvm_vcpu *vcpu, int nr_ports,
|
|
evtchn_port_t *ports)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct gfn_to_pfn_cache *gpc = &kvm->arch.xen.shinfo_cache;
|
|
unsigned long *pending_bits;
|
|
unsigned long flags;
|
|
bool ret = true;
|
|
int idx, i;
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, PAGE_SIZE))
|
|
goto out_rcu;
|
|
|
|
ret = false;
|
|
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) {
|
|
struct shared_info *shinfo = gpc->khva;
|
|
pending_bits = (unsigned long *)&shinfo->evtchn_pending;
|
|
} else {
|
|
struct compat_shared_info *shinfo = gpc->khva;
|
|
pending_bits = (unsigned long *)&shinfo->evtchn_pending;
|
|
}
|
|
|
|
for (i = 0; i < nr_ports; i++) {
|
|
if (test_bit(ports[i], pending_bits)) {
|
|
ret = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out_rcu:
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool kvm_xen_schedop_poll(struct kvm_vcpu *vcpu, bool longmode,
|
|
u64 param, u64 *r)
|
|
{
|
|
int idx, i;
|
|
struct sched_poll sched_poll;
|
|
evtchn_port_t port, *ports;
|
|
gpa_t gpa;
|
|
|
|
if (!longmode || !lapic_in_kernel(vcpu) ||
|
|
!(vcpu->kvm->arch.xen_hvm_config.flags & KVM_XEN_HVM_CONFIG_EVTCHN_SEND))
|
|
return false;
|
|
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
gpa = kvm_mmu_gva_to_gpa_system(vcpu, param, NULL);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
if (!gpa || kvm_vcpu_read_guest(vcpu, gpa, &sched_poll,
|
|
sizeof(sched_poll))) {
|
|
*r = -EFAULT;
|
|
return true;
|
|
}
|
|
|
|
if (unlikely(sched_poll.nr_ports > 1)) {
|
|
/* Xen (unofficially) limits number of pollers to 128 */
|
|
if (sched_poll.nr_ports > 128) {
|
|
*r = -EINVAL;
|
|
return true;
|
|
}
|
|
|
|
ports = kmalloc_array(sched_poll.nr_ports,
|
|
sizeof(*ports), GFP_KERNEL);
|
|
if (!ports) {
|
|
*r = -ENOMEM;
|
|
return true;
|
|
}
|
|
} else
|
|
ports = &port;
|
|
|
|
for (i = 0; i < sched_poll.nr_ports; i++) {
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
gpa = kvm_mmu_gva_to_gpa_system(vcpu,
|
|
(gva_t)(sched_poll.ports + i),
|
|
NULL);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
if (!gpa || kvm_vcpu_read_guest(vcpu, gpa,
|
|
&ports[i], sizeof(port))) {
|
|
*r = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (sched_poll.nr_ports == 1)
|
|
vcpu->arch.xen.poll_evtchn = port;
|
|
else
|
|
vcpu->arch.xen.poll_evtchn = -1;
|
|
|
|
set_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.xen.poll_mask);
|
|
|
|
if (!wait_pending_event(vcpu, sched_poll.nr_ports, ports)) {
|
|
vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
|
|
|
|
if (sched_poll.timeout)
|
|
mod_timer(&vcpu->arch.xen.poll_timer,
|
|
jiffies + nsecs_to_jiffies(sched_poll.timeout));
|
|
|
|
kvm_vcpu_halt(vcpu);
|
|
|
|
if (sched_poll.timeout)
|
|
del_timer(&vcpu->arch.xen.poll_timer);
|
|
|
|
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
|
|
kvm_clear_request(KVM_REQ_UNHALT, vcpu);
|
|
}
|
|
|
|
vcpu->arch.xen.poll_evtchn = 0;
|
|
*r = 0;
|
|
out:
|
|
/* Really, this is only needed in case of timeout */
|
|
clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.xen.poll_mask);
|
|
|
|
if (unlikely(sched_poll.nr_ports > 1))
|
|
kfree(ports);
|
|
return true;
|
|
}
|
|
|
|
static void cancel_evtchn_poll(struct timer_list *t)
|
|
{
|
|
struct kvm_vcpu *vcpu = from_timer(vcpu, t, arch.xen.poll_timer);
|
|
|
|
kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
|
|
kvm_vcpu_kick(vcpu);
|
|
}
|
|
|
|
static bool kvm_xen_hcall_sched_op(struct kvm_vcpu *vcpu, bool longmode,
|
|
int cmd, u64 param, u64 *r)
|
|
{
|
|
switch (cmd) {
|
|
case SCHEDOP_poll:
|
|
if (kvm_xen_schedop_poll(vcpu, longmode, param, r))
|
|
return true;
|
|
fallthrough;
|
|
case SCHEDOP_yield:
|
|
kvm_vcpu_on_spin(vcpu, true);
|
|
*r = 0;
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
struct compat_vcpu_set_singleshot_timer {
|
|
uint64_t timeout_abs_ns;
|
|
uint32_t flags;
|
|
} __attribute__((packed));
|
|
|
|
static bool kvm_xen_hcall_vcpu_op(struct kvm_vcpu *vcpu, bool longmode, int cmd,
|
|
int vcpu_id, u64 param, u64 *r)
|
|
{
|
|
struct vcpu_set_singleshot_timer oneshot;
|
|
s64 delta;
|
|
gpa_t gpa;
|
|
int idx;
|
|
|
|
if (!kvm_xen_timer_enabled(vcpu))
|
|
return false;
|
|
|
|
switch (cmd) {
|
|
case VCPUOP_set_singleshot_timer:
|
|
if (vcpu->arch.xen.vcpu_id != vcpu_id) {
|
|
*r = -EINVAL;
|
|
return true;
|
|
}
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
gpa = kvm_mmu_gva_to_gpa_system(vcpu, param, NULL);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
/*
|
|
* The only difference for 32-bit compat is the 4 bytes of
|
|
* padding after the interesting part of the structure. So
|
|
* for a faithful emulation of Xen we have to *try* to copy
|
|
* the padding and return -EFAULT if we can't. Otherwise we
|
|
* might as well just have copied the 12-byte 32-bit struct.
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct compat_vcpu_set_singleshot_timer, timeout_abs_ns) !=
|
|
offsetof(struct vcpu_set_singleshot_timer, timeout_abs_ns));
|
|
BUILD_BUG_ON(sizeof_field(struct compat_vcpu_set_singleshot_timer, timeout_abs_ns) !=
|
|
sizeof_field(struct vcpu_set_singleshot_timer, timeout_abs_ns));
|
|
BUILD_BUG_ON(offsetof(struct compat_vcpu_set_singleshot_timer, flags) !=
|
|
offsetof(struct vcpu_set_singleshot_timer, flags));
|
|
BUILD_BUG_ON(sizeof_field(struct compat_vcpu_set_singleshot_timer, flags) !=
|
|
sizeof_field(struct vcpu_set_singleshot_timer, flags));
|
|
|
|
if (!gpa ||
|
|
kvm_vcpu_read_guest(vcpu, gpa, &oneshot, longmode ? sizeof(oneshot) :
|
|
sizeof(struct compat_vcpu_set_singleshot_timer))) {
|
|
*r = -EFAULT;
|
|
return true;
|
|
}
|
|
|
|
delta = oneshot.timeout_abs_ns - get_kvmclock_ns(vcpu->kvm);
|
|
if ((oneshot.flags & VCPU_SSHOTTMR_future) && delta < 0) {
|
|
*r = -ETIME;
|
|
return true;
|
|
}
|
|
|
|
kvm_xen_start_timer(vcpu, oneshot.timeout_abs_ns, delta);
|
|
*r = 0;
|
|
return true;
|
|
|
|
case VCPUOP_stop_singleshot_timer:
|
|
if (vcpu->arch.xen.vcpu_id != vcpu_id) {
|
|
*r = -EINVAL;
|
|
return true;
|
|
}
|
|
kvm_xen_stop_timer(vcpu);
|
|
*r = 0;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool kvm_xen_hcall_set_timer_op(struct kvm_vcpu *vcpu, uint64_t timeout,
|
|
u64 *r)
|
|
{
|
|
if (!kvm_xen_timer_enabled(vcpu))
|
|
return false;
|
|
|
|
if (timeout) {
|
|
uint64_t guest_now = get_kvmclock_ns(vcpu->kvm);
|
|
int64_t delta = timeout - guest_now;
|
|
|
|
/* Xen has a 'Linux workaround' in do_set_timer_op() which
|
|
* checks for negative absolute timeout values (caused by
|
|
* integer overflow), and for values about 13 days in the
|
|
* future (2^50ns) which would be caused by jiffies
|
|
* overflow. For those cases, it sets the timeout 100ms in
|
|
* the future (not *too* soon, since if a guest really did
|
|
* set a long timeout on purpose we don't want to keep
|
|
* churning CPU time by waking it up).
|
|
*/
|
|
if (unlikely((int64_t)timeout < 0 ||
|
|
(delta > 0 && (uint32_t) (delta >> 50) != 0))) {
|
|
delta = 100 * NSEC_PER_MSEC;
|
|
timeout = guest_now + delta;
|
|
}
|
|
|
|
kvm_xen_start_timer(vcpu, timeout, delta);
|
|
} else {
|
|
kvm_xen_stop_timer(vcpu);
|
|
}
|
|
|
|
*r = 0;
|
|
return true;
|
|
}
|
|
|
|
int kvm_xen_hypercall(struct kvm_vcpu *vcpu)
|
|
{
|
|
bool longmode;
|
|
u64 input, params[6], r = -ENOSYS;
|
|
bool handled = false;
|
|
|
|
input = (u64)kvm_register_read(vcpu, VCPU_REGS_RAX);
|
|
|
|
/* Hyper-V hypercalls get bit 31 set in EAX */
|
|
if ((input & 0x80000000) &&
|
|
kvm_hv_hypercall_enabled(vcpu))
|
|
return kvm_hv_hypercall(vcpu);
|
|
|
|
longmode = is_64_bit_hypercall(vcpu);
|
|
if (!longmode) {
|
|
params[0] = (u32)kvm_rbx_read(vcpu);
|
|
params[1] = (u32)kvm_rcx_read(vcpu);
|
|
params[2] = (u32)kvm_rdx_read(vcpu);
|
|
params[3] = (u32)kvm_rsi_read(vcpu);
|
|
params[4] = (u32)kvm_rdi_read(vcpu);
|
|
params[5] = (u32)kvm_rbp_read(vcpu);
|
|
}
|
|
#ifdef CONFIG_X86_64
|
|
else {
|
|
params[0] = (u64)kvm_rdi_read(vcpu);
|
|
params[1] = (u64)kvm_rsi_read(vcpu);
|
|
params[2] = (u64)kvm_rdx_read(vcpu);
|
|
params[3] = (u64)kvm_r10_read(vcpu);
|
|
params[4] = (u64)kvm_r8_read(vcpu);
|
|
params[5] = (u64)kvm_r9_read(vcpu);
|
|
}
|
|
#endif
|
|
trace_kvm_xen_hypercall(input, params[0], params[1], params[2],
|
|
params[3], params[4], params[5]);
|
|
|
|
switch (input) {
|
|
case __HYPERVISOR_xen_version:
|
|
if (params[0] == XENVER_version && vcpu->kvm->arch.xen.xen_version) {
|
|
r = vcpu->kvm->arch.xen.xen_version;
|
|
handled = true;
|
|
}
|
|
break;
|
|
case __HYPERVISOR_event_channel_op:
|
|
if (params[0] == EVTCHNOP_send)
|
|
handled = kvm_xen_hcall_evtchn_send(vcpu, params[1], &r);
|
|
break;
|
|
case __HYPERVISOR_sched_op:
|
|
handled = kvm_xen_hcall_sched_op(vcpu, longmode, params[0],
|
|
params[1], &r);
|
|
break;
|
|
case __HYPERVISOR_vcpu_op:
|
|
handled = kvm_xen_hcall_vcpu_op(vcpu, longmode, params[0], params[1],
|
|
params[2], &r);
|
|
break;
|
|
case __HYPERVISOR_set_timer_op: {
|
|
u64 timeout = params[0];
|
|
/* In 32-bit mode, the 64-bit timeout is in two 32-bit params. */
|
|
if (!longmode)
|
|
timeout |= params[1] << 32;
|
|
handled = kvm_xen_hcall_set_timer_op(vcpu, timeout, &r);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (handled)
|
|
return kvm_xen_hypercall_set_result(vcpu, r);
|
|
|
|
vcpu->run->exit_reason = KVM_EXIT_XEN;
|
|
vcpu->run->xen.type = KVM_EXIT_XEN_HCALL;
|
|
vcpu->run->xen.u.hcall.longmode = longmode;
|
|
vcpu->run->xen.u.hcall.cpl = static_call(kvm_x86_get_cpl)(vcpu);
|
|
vcpu->run->xen.u.hcall.input = input;
|
|
vcpu->run->xen.u.hcall.params[0] = params[0];
|
|
vcpu->run->xen.u.hcall.params[1] = params[1];
|
|
vcpu->run->xen.u.hcall.params[2] = params[2];
|
|
vcpu->run->xen.u.hcall.params[3] = params[3];
|
|
vcpu->run->xen.u.hcall.params[4] = params[4];
|
|
vcpu->run->xen.u.hcall.params[5] = params[5];
|
|
vcpu->arch.xen.hypercall_rip = kvm_get_linear_rip(vcpu);
|
|
vcpu->arch.complete_userspace_io =
|
|
kvm_xen_hypercall_complete_userspace;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int max_evtchn_port(struct kvm *kvm)
|
|
{
|
|
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode)
|
|
return EVTCHN_2L_NR_CHANNELS;
|
|
else
|
|
return COMPAT_EVTCHN_2L_NR_CHANNELS;
|
|
}
|
|
|
|
static void kvm_xen_check_poller(struct kvm_vcpu *vcpu, int port)
|
|
{
|
|
int poll_evtchn = vcpu->arch.xen.poll_evtchn;
|
|
|
|
if ((poll_evtchn == port || poll_evtchn == -1) &&
|
|
test_and_clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.xen.poll_mask)) {
|
|
kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
|
|
kvm_vcpu_kick(vcpu);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The return value from this function is propagated to kvm_set_irq() API,
|
|
* so it returns:
|
|
* < 0 Interrupt was ignored (masked or not delivered for other reasons)
|
|
* = 0 Interrupt was coalesced (previous irq is still pending)
|
|
* > 0 Number of CPUs interrupt was delivered to
|
|
*
|
|
* It is also called directly from kvm_arch_set_irq_inatomic(), where the
|
|
* only check on its return value is a comparison with -EWOULDBLOCK'.
|
|
*/
|
|
int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, struct kvm *kvm)
|
|
{
|
|
struct gfn_to_pfn_cache *gpc = &kvm->arch.xen.shinfo_cache;
|
|
struct kvm_vcpu *vcpu;
|
|
unsigned long *pending_bits, *mask_bits;
|
|
unsigned long flags;
|
|
int port_word_bit;
|
|
bool kick_vcpu = false;
|
|
int vcpu_idx, idx, rc;
|
|
|
|
vcpu_idx = READ_ONCE(xe->vcpu_idx);
|
|
if (vcpu_idx >= 0)
|
|
vcpu = kvm_get_vcpu(kvm, vcpu_idx);
|
|
else {
|
|
vcpu = kvm_get_vcpu_by_id(kvm, xe->vcpu_id);
|
|
if (!vcpu)
|
|
return -EINVAL;
|
|
WRITE_ONCE(xe->vcpu_idx, kvm_vcpu_get_idx(vcpu));
|
|
}
|
|
|
|
if (!vcpu->arch.xen.vcpu_info_cache.active)
|
|
return -EINVAL;
|
|
|
|
if (xe->port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
rc = -EWOULDBLOCK;
|
|
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, PAGE_SIZE))
|
|
goto out_rcu;
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) {
|
|
struct shared_info *shinfo = gpc->khva;
|
|
pending_bits = (unsigned long *)&shinfo->evtchn_pending;
|
|
mask_bits = (unsigned long *)&shinfo->evtchn_mask;
|
|
port_word_bit = xe->port / 64;
|
|
} else {
|
|
struct compat_shared_info *shinfo = gpc->khva;
|
|
pending_bits = (unsigned long *)&shinfo->evtchn_pending;
|
|
mask_bits = (unsigned long *)&shinfo->evtchn_mask;
|
|
port_word_bit = xe->port / 32;
|
|
}
|
|
|
|
/*
|
|
* If this port wasn't already set, and if it isn't masked, then
|
|
* we try to set the corresponding bit in the in-kernel shadow of
|
|
* evtchn_pending_sel for the target vCPU. And if *that* wasn't
|
|
* already set, then we kick the vCPU in question to write to the
|
|
* *real* evtchn_pending_sel in its own guest vcpu_info struct.
|
|
*/
|
|
if (test_and_set_bit(xe->port, pending_bits)) {
|
|
rc = 0; /* It was already raised */
|
|
} else if (test_bit(xe->port, mask_bits)) {
|
|
rc = -ENOTCONN; /* Masked */
|
|
kvm_xen_check_poller(vcpu, xe->port);
|
|
} else {
|
|
rc = 1; /* Delivered to the bitmap in shared_info. */
|
|
/* Now switch to the vCPU's vcpu_info to set the index and pending_sel */
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
gpc = &vcpu->arch.xen.vcpu_info_cache;
|
|
|
|
read_lock_irqsave(&gpc->lock, flags);
|
|
if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, sizeof(struct vcpu_info))) {
|
|
/*
|
|
* Could not access the vcpu_info. Set the bit in-kernel
|
|
* and prod the vCPU to deliver it for itself.
|
|
*/
|
|
if (!test_and_set_bit(port_word_bit, &vcpu->arch.xen.evtchn_pending_sel))
|
|
kick_vcpu = true;
|
|
goto out_rcu;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) {
|
|
struct vcpu_info *vcpu_info = gpc->khva;
|
|
if (!test_and_set_bit(port_word_bit, &vcpu_info->evtchn_pending_sel)) {
|
|
WRITE_ONCE(vcpu_info->evtchn_upcall_pending, 1);
|
|
kick_vcpu = true;
|
|
}
|
|
} else {
|
|
struct compat_vcpu_info *vcpu_info = gpc->khva;
|
|
if (!test_and_set_bit(port_word_bit,
|
|
(unsigned long *)&vcpu_info->evtchn_pending_sel)) {
|
|
WRITE_ONCE(vcpu_info->evtchn_upcall_pending, 1);
|
|
kick_vcpu = true;
|
|
}
|
|
}
|
|
|
|
/* For the per-vCPU lapic vector, deliver it as MSI. */
|
|
if (kick_vcpu && vcpu->arch.xen.upcall_vector) {
|
|
kvm_xen_inject_vcpu_vector(vcpu);
|
|
kick_vcpu = false;
|
|
}
|
|
}
|
|
|
|
out_rcu:
|
|
read_unlock_irqrestore(&gpc->lock, flags);
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
|
|
if (kick_vcpu) {
|
|
kvm_make_request(KVM_REQ_UNBLOCK, vcpu);
|
|
kvm_vcpu_kick(vcpu);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int kvm_xen_set_evtchn(struct kvm_xen_evtchn *xe, struct kvm *kvm)
|
|
{
|
|
bool mm_borrowed = false;
|
|
int rc;
|
|
|
|
rc = kvm_xen_set_evtchn_fast(xe, kvm);
|
|
if (rc != -EWOULDBLOCK)
|
|
return rc;
|
|
|
|
if (current->mm != kvm->mm) {
|
|
/*
|
|
* If not on a thread which already belongs to this KVM,
|
|
* we'd better be in the irqfd workqueue.
|
|
*/
|
|
if (WARN_ON_ONCE(current->mm))
|
|
return -EINVAL;
|
|
|
|
kthread_use_mm(kvm->mm);
|
|
mm_borrowed = true;
|
|
}
|
|
|
|
/*
|
|
* For the irqfd workqueue, using the main kvm->lock mutex is
|
|
* fine since this function is invoked from kvm_set_irq() with
|
|
* no other lock held, no srcu. In future if it will be called
|
|
* directly from a vCPU thread (e.g. on hypercall for an IPI)
|
|
* then it may need to switch to using a leaf-node mutex for
|
|
* serializing the shared_info mapping.
|
|
*/
|
|
mutex_lock(&kvm->lock);
|
|
|
|
/*
|
|
* It is theoretically possible for the page to be unmapped
|
|
* and the MMU notifier to invalidate the shared_info before
|
|
* we even get to use it. In that case, this looks like an
|
|
* infinite loop. It was tempting to do it via the userspace
|
|
* HVA instead... but that just *hides* the fact that it's
|
|
* an infinite loop, because if a fault occurs and it waits
|
|
* for the page to come back, it can *still* immediately
|
|
* fault and have to wait again, repeatedly.
|
|
*
|
|
* Conversely, the page could also have been reinstated by
|
|
* another thread before we even obtain the mutex above, so
|
|
* check again *first* before remapping it.
|
|
*/
|
|
do {
|
|
struct gfn_to_pfn_cache *gpc = &kvm->arch.xen.shinfo_cache;
|
|
int idx;
|
|
|
|
rc = kvm_xen_set_evtchn_fast(xe, kvm);
|
|
if (rc != -EWOULDBLOCK)
|
|
break;
|
|
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
rc = kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpc->gpa, PAGE_SIZE);
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
} while(!rc);
|
|
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
if (mm_borrowed)
|
|
kthread_unuse_mm(kvm->mm);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* This is the version called from kvm_set_irq() as the .set function */
|
|
static int evtchn_set_fn(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
|
|
int irq_source_id, int level, bool line_status)
|
|
{
|
|
if (!level)
|
|
return -EINVAL;
|
|
|
|
return kvm_xen_set_evtchn(&e->xen_evtchn, kvm);
|
|
}
|
|
|
|
/*
|
|
* Set up an event channel interrupt from the KVM IRQ routing table.
|
|
* Used for e.g. PIRQ from passed through physical devices.
|
|
*/
|
|
int kvm_xen_setup_evtchn(struct kvm *kvm,
|
|
struct kvm_kernel_irq_routing_entry *e,
|
|
const struct kvm_irq_routing_entry *ue)
|
|
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
if (ue->u.xen_evtchn.port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
/* We only support 2 level event channels for now */
|
|
if (ue->u.xen_evtchn.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Xen gives us interesting mappings from vCPU index to APIC ID,
|
|
* which means kvm_get_vcpu_by_id() has to iterate over all vCPUs
|
|
* to find it. Do that once at setup time, instead of every time.
|
|
* But beware that on live update / live migration, the routing
|
|
* table might be reinstated before the vCPU threads have finished
|
|
* recreating their vCPUs.
|
|
*/
|
|
vcpu = kvm_get_vcpu_by_id(kvm, ue->u.xen_evtchn.vcpu);
|
|
if (vcpu)
|
|
e->xen_evtchn.vcpu_idx = kvm_vcpu_get_idx(vcpu);
|
|
else
|
|
e->xen_evtchn.vcpu_idx = -1;
|
|
|
|
e->xen_evtchn.port = ue->u.xen_evtchn.port;
|
|
e->xen_evtchn.vcpu_id = ue->u.xen_evtchn.vcpu;
|
|
e->xen_evtchn.priority = ue->u.xen_evtchn.priority;
|
|
e->set = evtchn_set_fn;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Explicit event sending from userspace with KVM_XEN_HVM_EVTCHN_SEND ioctl.
|
|
*/
|
|
int kvm_xen_hvm_evtchn_send(struct kvm *kvm, struct kvm_irq_routing_xen_evtchn *uxe)
|
|
{
|
|
struct kvm_xen_evtchn e;
|
|
int ret;
|
|
|
|
if (!uxe->port || uxe->port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
/* We only support 2 level event channels for now */
|
|
if (uxe->priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL)
|
|
return -EINVAL;
|
|
|
|
e.port = uxe->port;
|
|
e.vcpu_id = uxe->vcpu;
|
|
e.vcpu_idx = -1;
|
|
e.priority = uxe->priority;
|
|
|
|
ret = kvm_xen_set_evtchn(&e, kvm);
|
|
|
|
/*
|
|
* None of that 'return 1 if it actually got delivered' nonsense.
|
|
* We don't care if it was masked (-ENOTCONN) either.
|
|
*/
|
|
if (ret > 0 || ret == -ENOTCONN)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Support for *outbound* event channel events via the EVTCHNOP_send hypercall.
|
|
*/
|
|
struct evtchnfd {
|
|
u32 send_port;
|
|
u32 type;
|
|
union {
|
|
struct kvm_xen_evtchn port;
|
|
struct {
|
|
u32 port; /* zero */
|
|
struct eventfd_ctx *ctx;
|
|
} eventfd;
|
|
} deliver;
|
|
};
|
|
|
|
/*
|
|
* Update target vCPU or priority for a registered sending channel.
|
|
*/
|
|
static int kvm_xen_eventfd_update(struct kvm *kvm,
|
|
struct kvm_xen_hvm_attr *data)
|
|
{
|
|
u32 port = data->u.evtchn.send_port;
|
|
struct evtchnfd *evtchnfd;
|
|
|
|
if (!port || port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
evtchnfd = idr_find(&kvm->arch.xen.evtchn_ports, port);
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
if (!evtchnfd)
|
|
return -ENOENT;
|
|
|
|
/* For an UPDATE, nothing may change except the priority/vcpu */
|
|
if (evtchnfd->type != data->u.evtchn.type)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Port cannot change, and if it's zero that was an eventfd
|
|
* which can't be changed either.
|
|
*/
|
|
if (!evtchnfd->deliver.port.port ||
|
|
evtchnfd->deliver.port.port != data->u.evtchn.deliver.port.port)
|
|
return -EINVAL;
|
|
|
|
/* We only support 2 level event channels for now */
|
|
if (data->u.evtchn.deliver.port.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
evtchnfd->deliver.port.priority = data->u.evtchn.deliver.port.priority;
|
|
if (evtchnfd->deliver.port.vcpu_id != data->u.evtchn.deliver.port.vcpu) {
|
|
evtchnfd->deliver.port.vcpu_id = data->u.evtchn.deliver.port.vcpu;
|
|
evtchnfd->deliver.port.vcpu_idx = -1;
|
|
}
|
|
mutex_unlock(&kvm->lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Configure the target (eventfd or local port delivery) for sending on
|
|
* a given event channel.
|
|
*/
|
|
static int kvm_xen_eventfd_assign(struct kvm *kvm,
|
|
struct kvm_xen_hvm_attr *data)
|
|
{
|
|
u32 port = data->u.evtchn.send_port;
|
|
struct eventfd_ctx *eventfd = NULL;
|
|
struct evtchnfd *evtchnfd = NULL;
|
|
int ret = -EINVAL;
|
|
|
|
if (!port || port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
evtchnfd = kzalloc(sizeof(struct evtchnfd), GFP_KERNEL);
|
|
if (!evtchnfd)
|
|
return -ENOMEM;
|
|
|
|
switch(data->u.evtchn.type) {
|
|
case EVTCHNSTAT_ipi:
|
|
/* IPI must map back to the same port# */
|
|
if (data->u.evtchn.deliver.port.port != data->u.evtchn.send_port)
|
|
goto out; /* -EINVAL */
|
|
break;
|
|
|
|
case EVTCHNSTAT_interdomain:
|
|
if (data->u.evtchn.deliver.port.port) {
|
|
if (data->u.evtchn.deliver.port.port >= max_evtchn_port(kvm))
|
|
goto out; /* -EINVAL */
|
|
} else {
|
|
eventfd = eventfd_ctx_fdget(data->u.evtchn.deliver.eventfd.fd);
|
|
if (IS_ERR(eventfd)) {
|
|
ret = PTR_ERR(eventfd);
|
|
goto out;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case EVTCHNSTAT_virq:
|
|
case EVTCHNSTAT_closed:
|
|
case EVTCHNSTAT_unbound:
|
|
case EVTCHNSTAT_pirq:
|
|
default: /* Unknown event channel type */
|
|
goto out; /* -EINVAL */
|
|
}
|
|
|
|
evtchnfd->send_port = data->u.evtchn.send_port;
|
|
evtchnfd->type = data->u.evtchn.type;
|
|
if (eventfd) {
|
|
evtchnfd->deliver.eventfd.ctx = eventfd;
|
|
} else {
|
|
/* We only support 2 level event channels for now */
|
|
if (data->u.evtchn.deliver.port.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL)
|
|
goto out; /* -EINVAL; */
|
|
|
|
evtchnfd->deliver.port.port = data->u.evtchn.deliver.port.port;
|
|
evtchnfd->deliver.port.vcpu_id = data->u.evtchn.deliver.port.vcpu;
|
|
evtchnfd->deliver.port.vcpu_idx = -1;
|
|
evtchnfd->deliver.port.priority = data->u.evtchn.deliver.port.priority;
|
|
}
|
|
|
|
mutex_lock(&kvm->lock);
|
|
ret = idr_alloc(&kvm->arch.xen.evtchn_ports, evtchnfd, port, port + 1,
|
|
GFP_KERNEL);
|
|
mutex_unlock(&kvm->lock);
|
|
if (ret >= 0)
|
|
return 0;
|
|
|
|
if (ret == -ENOSPC)
|
|
ret = -EEXIST;
|
|
out:
|
|
if (eventfd)
|
|
eventfd_ctx_put(eventfd);
|
|
kfree(evtchnfd);
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_xen_eventfd_deassign(struct kvm *kvm, u32 port)
|
|
{
|
|
struct evtchnfd *evtchnfd;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
evtchnfd = idr_remove(&kvm->arch.xen.evtchn_ports, port);
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
if (!evtchnfd)
|
|
return -ENOENT;
|
|
|
|
if (kvm)
|
|
synchronize_srcu(&kvm->srcu);
|
|
if (!evtchnfd->deliver.port.port)
|
|
eventfd_ctx_put(evtchnfd->deliver.eventfd.ctx);
|
|
kfree(evtchnfd);
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_xen_eventfd_reset(struct kvm *kvm)
|
|
{
|
|
struct evtchnfd *evtchnfd;
|
|
int i;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
idr_for_each_entry(&kvm->arch.xen.evtchn_ports, evtchnfd, i) {
|
|
idr_remove(&kvm->arch.xen.evtchn_ports, evtchnfd->send_port);
|
|
synchronize_srcu(&kvm->srcu);
|
|
if (!evtchnfd->deliver.port.port)
|
|
eventfd_ctx_put(evtchnfd->deliver.eventfd.ctx);
|
|
kfree(evtchnfd);
|
|
}
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_xen_setattr_evtchn(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
|
|
{
|
|
u32 port = data->u.evtchn.send_port;
|
|
|
|
if (data->u.evtchn.flags == KVM_XEN_EVTCHN_RESET)
|
|
return kvm_xen_eventfd_reset(kvm);
|
|
|
|
if (!port || port >= max_evtchn_port(kvm))
|
|
return -EINVAL;
|
|
|
|
if (data->u.evtchn.flags == KVM_XEN_EVTCHN_DEASSIGN)
|
|
return kvm_xen_eventfd_deassign(kvm, port);
|
|
if (data->u.evtchn.flags == KVM_XEN_EVTCHN_UPDATE)
|
|
return kvm_xen_eventfd_update(kvm, data);
|
|
if (data->u.evtchn.flags)
|
|
return -EINVAL;
|
|
|
|
return kvm_xen_eventfd_assign(kvm, data);
|
|
}
|
|
|
|
static bool kvm_xen_hcall_evtchn_send(struct kvm_vcpu *vcpu, u64 param, u64 *r)
|
|
{
|
|
struct evtchnfd *evtchnfd;
|
|
struct evtchn_send send;
|
|
gpa_t gpa;
|
|
int idx;
|
|
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
gpa = kvm_mmu_gva_to_gpa_system(vcpu, param, NULL);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
if (!gpa || kvm_vcpu_read_guest(vcpu, gpa, &send, sizeof(send))) {
|
|
*r = -EFAULT;
|
|
return true;
|
|
}
|
|
|
|
/* The evtchn_ports idr is protected by vcpu->kvm->srcu */
|
|
evtchnfd = idr_find(&vcpu->kvm->arch.xen.evtchn_ports, send.port);
|
|
if (!evtchnfd)
|
|
return false;
|
|
|
|
if (evtchnfd->deliver.port.port) {
|
|
int ret = kvm_xen_set_evtchn(&evtchnfd->deliver.port, vcpu->kvm);
|
|
if (ret < 0 && ret != -ENOTCONN)
|
|
return false;
|
|
} else {
|
|
eventfd_signal(evtchnfd->deliver.eventfd.ctx, 1);
|
|
}
|
|
|
|
*r = 0;
|
|
return true;
|
|
}
|
|
|
|
void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->arch.xen.vcpu_id = vcpu->vcpu_idx;
|
|
vcpu->arch.xen.poll_evtchn = 0;
|
|
timer_setup(&vcpu->arch.xen.poll_timer, cancel_evtchn_poll, 0);
|
|
}
|
|
|
|
void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (kvm_xen_timer_enabled(vcpu))
|
|
kvm_xen_stop_timer(vcpu);
|
|
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,
|
|
&vcpu->arch.xen.runstate_cache);
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,
|
|
&vcpu->arch.xen.vcpu_info_cache);
|
|
kvm_gfn_to_pfn_cache_destroy(vcpu->kvm,
|
|
&vcpu->arch.xen.vcpu_time_info_cache);
|
|
del_timer_sync(&vcpu->arch.xen.poll_timer);
|
|
}
|
|
|
|
void kvm_xen_init_vm(struct kvm *kvm)
|
|
{
|
|
idr_init(&kvm->arch.xen.evtchn_ports);
|
|
}
|
|
|
|
void kvm_xen_destroy_vm(struct kvm *kvm)
|
|
{
|
|
struct evtchnfd *evtchnfd;
|
|
int i;
|
|
|
|
kvm_gfn_to_pfn_cache_destroy(kvm, &kvm->arch.xen.shinfo_cache);
|
|
|
|
idr_for_each_entry(&kvm->arch.xen.evtchn_ports, evtchnfd, i) {
|
|
if (!evtchnfd->deliver.port.port)
|
|
eventfd_ctx_put(evtchnfd->deliver.eventfd.ctx);
|
|
kfree(evtchnfd);
|
|
}
|
|
idr_destroy(&kvm->arch.xen.evtchn_ports);
|
|
|
|
if (kvm->arch.xen_hvm_config.msr)
|
|
static_branch_slow_dec_deferred(&kvm_xen_enabled);
|
|
}
|