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KVM: generalize "bugged" VM to "dead" VM 

Generalize KVM_REQ_VM_BUGGED so that it can be called even in cases
where it is by design that the VM cannot be operated upon.  In this
case any KVM_BUG_ON should still warn, so introduce a new flag
kvm->vm_dead that is separate from kvm->vm_bugged.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-11-11 10:13:38 -05:00
parent b67a4cc35c
commit f4d3165370
3 changed files with 16 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/x86.c
View File

@ -9654,7 +9654,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
}
if (kvm_request_pending(vcpu)) {
if (kvm_check_request(KVM_REQ_VM_BUGGED, vcpu)) {
if (kvm_check_request(KVM_REQ_VM_DEAD, vcpu)) {
r = -EIO;
goto out;
}

12
include/linux/kvm_host.h
View File

@ -150,7 +150,7 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_MMU_RELOAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_UNBLOCK 2
#define KVM_REQ_UNHALT 3
#define KVM_REQ_VM_BUGGED (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_VM_DEAD (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQUEST_ARCH_BASE 8
#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
@ -617,6 +617,7 @@ struct kvm {
unsigned int max_halt_poll_ns;
u32 dirty_ring_size;
bool vm_bugged;
bool vm_dead;
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
struct notifier_block pm_notifier;
@ -650,12 +651,19 @@ struct kvm {
#define vcpu_err(vcpu, fmt, ...) \
kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
static inline void kvm_vm_dead(struct kvm *kvm)
{
kvm->vm_dead = true;
kvm_make_all_cpus_request(kvm, KVM_REQ_VM_DEAD);
}
static inline void kvm_vm_bugged(struct kvm *kvm)
{
kvm->vm_bugged = true;
kvm_make_all_cpus_request(kvm, KVM_REQ_VM_BUGGED);
kvm_vm_dead(kvm);
}
#define KVM_BUG(cond, kvm, fmt...) \
({ \
int __ret = (cond); \

10
virt/kvm/kvm_main.c
View File

@ -3747,7 +3747,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
struct kvm_fpu *fpu = NULL;
struct kvm_sregs *kvm_sregs = NULL;
if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged)
if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_dead)
return -EIO;
if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
@ -3957,7 +3957,7 @@ static long kvm_vcpu_compat_ioctl(struct file *filp,
void __user *argp = compat_ptr(arg);
int r;
if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged)
if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_dead)
return -EIO;
switch (ioctl) {
@ -4023,7 +4023,7 @@ static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
{
struct kvm_device *dev = filp->private_data;
if (dev->kvm->mm != current->mm || dev->kvm->vm_bugged)
if (dev->kvm->mm != current->mm || dev->kvm->vm_dead)
return -EIO;
switch (ioctl) {
@ -4345,7 +4345,7 @@ static long kvm_vm_ioctl(struct file *filp,
void __user *argp = (void __user *)arg;
int r;
if (kvm->mm != current->mm || kvm->vm_bugged)
if (kvm->mm != current->mm || kvm->vm_dead)
return -EIO;
switch (ioctl) {
case KVM_CREATE_VCPU:
@ -4556,7 +4556,7 @@ static long kvm_vm_compat_ioctl(struct file *filp,
struct kvm *kvm = filp->private_data;
int r;
if (kvm->mm != current->mm || kvm->vm_bugged)
if (kvm->mm != current->mm || kvm->vm_dead)
return -EIO;
switch (ioctl) {
#ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT