svm: exit to userspace if write to cr8 and not using in-kernel apic
PATCH 1/1 svm: exit to userspace if write to cr8 and not using in-kernel apic
With this patch KVM on SVM will exit to userspace if the guest writes to CR8 and the in-kernel APIC is disabled.
Signed-off-by Joerg Roedel <[email protected]>
Signed-off-by Markus Rechberger <[email protected]>
--- drivers/kvm/svm.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-)
drivers/kvm/svm.c +10 -1
@@ -1048,6 +1048,15 @@ static int emulate_on_interception(struct vcpu_svm *svm,return 1 ; } +static int cr8_write_interception (struct vcpu_svm *svm,struct kvm_run *kvm_run) +{ +emulate_instruction (&svm->vcpu,NULL ,0 ,0 ,0 ); +if (irqchip_in_kernel (svm->vcpu.kvm)) +return 1 ; + kvm_run->exit_reason =KVM_EXIT_SET_TPR ; +return 0 ; +} +static int svm_get_msr (struct kvm_vcpu *vcpu,unsigned ecx,u64 *data) {struct vcpu_svm *svm =to_svm (vcpu);
@@ -1202,7 +1211,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm, [SVM_EXIT_WRITE_CR0] = emulate_on_interception, [SVM_EXIT_WRITE_CR3] = emulate_on_interception, [SVM_EXIT_WRITE_CR4] = emulate_on_interception, - [SVM_EXIT_WRITE_CR8] = emulate_on_interception, + [SVM_EXIT_WRITE_CR8] = cr8_write_interception, [SVM_EXIT_READ_DR0] = emulate_on_interception, [SVM_EXIT_READ_DR1] = emulate_on_interception, [SVM_EXIT_READ_DR2] = emulate_on_interception,
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Avi Kivity
AppliedQuoted 4 lines · Joerg Roedel
With this patch KVM on SVM will exit to userspace if the guest writes to CR8 and the in-kernel APIC is disabled.
Applied, thanks.
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