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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm:
  KVM: Prevent guest fpu state from leaking into the host
This commit is contained in:
Linus Torvalds 2007-06-15 16:14:34 -07:00
commit 3ea88d6738
3 changed files with 28 additions and 9 deletions
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3
drivers/kvm/kvm.h
View file

@ -304,6 +304,7 @@ struct kvm_vcpu {
char *host_fx_image;
char *guest_fx_image;
int fpu_active;
int guest_fpu_loaded;
int mmio_needed;
int mmio_read_completed;
@ -508,6 +509,8 @@ void fx_init(struct kvm_vcpu *vcpu);
void load_msrs(struct vmx_msr_entry *e, int n);
void save_msrs(struct vmx_msr_entry *e, int n);
void kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
int kvm_read_guest(struct kvm_vcpu *vcpu,
gva_t addr,

22
drivers/kvm/kvm_main.c
View file

@ -253,6 +253,28 @@ int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
}
EXPORT_SYMBOL_GPL(kvm_write_guest);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
{
if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
return;
vcpu->guest_fpu_loaded = 1;
fx_save(vcpu->host_fx_image);
fx_restore(vcpu->guest_fx_image);
}
EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
{
if (!vcpu->guest_fpu_loaded)
return;
vcpu->guest_fpu_loaded = 0;
fx_save(vcpu->guest_fx_image);
fx_restore(vcpu->host_fx_image);
}
EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
/*
* Switches to specified vcpu, until a matching vcpu_put()
*/

12
drivers/kvm/vmx.c
View file

@ -280,6 +280,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_put_guest_fpu(vcpu);
put_cpu();
}
@ -1847,10 +1848,8 @@ static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (vcpu->guest_debug.enabled)
kvm_guest_debug_pre(vcpu);
if (vcpu->fpu_active) {
fx_save(vcpu->host_fx_image);
fx_restore(vcpu->guest_fx_image);
}
kvm_load_guest_fpu(vcpu);
/*
* Loading guest fpu may have cleared host cr0.ts
*/
@ -2012,11 +2011,6 @@ static int vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
}
#endif
if (vcpu->fpu_active) {
fx_save(vcpu->guest_fx_image);
fx_restore(vcpu->host_fx_image);
}
vcpu->interrupt_window_open = (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));