Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 52/54] KVM: SVM: Exit to userspace if write to cr8 and not using in-kernel apic | Date | Tue, 1 Jan 2008 17:36:18 +0200 |
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From: Joerg Roedel <joerg.roedel@amd.com>
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 <joerg.roedel@amd.com> Signed-off-by: Markus Rechberger <markus.rechberger@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com> --- drivers/kvm/svm.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 677b525..9f8564a 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -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, -- 1.5.3.7
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