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KVM: arm/arm64: Remove the IRQ field from struct irq_phys_map 

The communication of a Linux IRQ number from outside the VGIC to the
vgic was a leftover from the day when the vgic code cared about how a
particular device injects virtual interrupts mapped to a physical
interrupt.

We can safely remove this notion, leaving all physical IRQ handling to
be done in the device driver (the arch timer in this case), which makes
room for a saner API for the new VGIC.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Eric Auger <eric.auger@linaro.org>
This commit is contained in:
Christoffer Dall 2016-06-04 15:41:00 +01:00
parent 63306c28ac
commit b452cb5207
3 changed files with 28 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/kvm/arm_vgic.h
View File

@ -158,7 +158,6 @@ struct vgic_io_device {
struct irq_phys_map {
u32 virt_irq;
u32 phys_irq;
u32 irq;
};
struct irq_phys_map_entry {
@ -346,7 +345,7 @@ int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid,
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
int virt_irq, int irq);
int virt_irq, int phys_irq);
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq);
bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int virt_irq);

23
virt/kvm/arm/arch_timer.c
View File

@ -20,6 +20,7 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <clocksource/arm_arch_timer.h>
#include <asm/arch_timer.h>
@ -300,7 +301,7 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
if (timer->active_cleared_last && !phys_active)
return;
ret = irq_set_irqchip_state(timer->map->irq,
ret = irq_set_irqchip_state(host_vtimer_irq,
IRQCHIP_STATE_ACTIVE,
phys_active);
WARN_ON(ret);
@ -333,6 +334,9 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct irq_phys_map *map;
struct irq_desc *desc;
struct irq_data *data;
int phys_irq;
/*
* The vcpu timer irq number cannot be determined in
@ -351,11 +355,26 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
timer->cntv_ctl = 0;
kvm_timer_update_state(vcpu);
/*
* Find the physical IRQ number corresponding to the host_vtimer_irq
*/
desc = irq_to_desc(host_vtimer_irq);
if (!desc) {
kvm_err("%s: no interrupt descriptor\n", __func__);
return -EINVAL;
}
data = irq_desc_get_irq_data(desc);
while (data->parent_data)
data = data->parent_data;
phys_irq = data->hwirq;
/*
* Tell the VGIC that the virtual interrupt is tied to a
* physical interrupt. We do that once per VCPU.
*/
map = kvm_vgic_map_phys_irq(vcpu, irq->irq, host_vtimer_irq);
map = kvm_vgic_map_phys_irq(vcpu, irq->irq, phys_irq);
if (WARN_ON(IS_ERR(map)))
return PTR_ERR(map);

28
virt/kvm/arm/vgic.c
View File

@ -1711,38 +1711,24 @@ static struct list_head *vgic_get_irq_phys_map_list(struct kvm_vcpu *vcpu,
/**
* kvm_vgic_map_phys_irq - map a virtual IRQ to a physical IRQ
* @vcpu: The VCPU pointer
* @virt_irq: The virtual irq number
* @irq: The Linux IRQ number
* @virt_irq: The virtual IRQ number for the guest
* @phys_irq: The hardware IRQ number of the host
*
* Establish a mapping between a guest visible irq (@virt_irq) and a
* Linux irq (@irq). On injection, @virt_irq will be associated with
* the physical interrupt represented by @irq. This mapping can be
* hardware irq (@phys_irq). On injection, @virt_irq will be associated with
* the physical interrupt represented by @phys_irq. This mapping can be
* established multiple times as long as the parameters are the same.
*
* Returns a valid pointer on success, and an error pointer otherwise
*/
struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
int virt_irq, int irq)
int virt_irq, int phys_irq)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct list_head *root = vgic_get_irq_phys_map_list(vcpu, virt_irq);
struct irq_phys_map *map;
struct irq_phys_map_entry *entry;
struct irq_desc *desc;
struct irq_data *data;
int phys_irq;
desc = irq_to_desc(irq);
if (!desc) {
kvm_err("%s: no interrupt descriptor\n", __func__);
return ERR_PTR(-EINVAL);
}
data = irq_desc_get_irq_data(desc);
while (data->parent_data)
data = data->parent_data;
phys_irq = data->hwirq;
/* Create a new mapping */
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
@ -1755,8 +1741,7 @@ struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
map = vgic_irq_map_search(vcpu, virt_irq);
if (map) {
/* Make sure this mapping matches */
if (map->phys_irq != phys_irq ||
map->irq != irq)
if (map->phys_irq != phys_irq)
map = ERR_PTR(-EINVAL);
/* Found an existing, valid mapping */
@ -1766,7 +1751,6 @@ struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
map = &entry->map;
map->virt_irq = virt_irq;
map->phys_irq = phys_irq;
map->irq = irq;
list_add_tail_rcu(&entry->entry, root);