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| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-15 16:14:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-15 16:14:34 -0700 |
| commit | 3ea88d6738ebda95e05ada0c7b72f224d0a36953 (patch) | |
| tree | b087d4d9d978556d6f673d8ce93489ef2b0da9ad /drivers/kvm/kvm_main.c | |
| parent | 4ff4275b24fdcca189b33f9a73fe7abef1dc84bc (diff) | |
| parent | 7702fd1f6fea57921f2e643d27a23a2d0394499c (diff) | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm:
KVM: Prevent guest fpu state from leaking into the host
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index da985b31b17e..8f1f07adb04e 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -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() */ |