From f3380ca5d7edb5e31932998ab2e29dfdce39c5ed Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Tue, 5 Aug 2014 12:42:23 +0800 Subject: [PATCH] KVM: nVMX: Fix nested vmexit ack intr before load vmcs01 An external interrupt will cause a vmexit with reason "external interrupt" when L2 is running. L1 will pick up the interrupt through vmcs12 if L1 set the ack interrupt bit. Commit 77b0f5d (KVM: nVMX: Ack and write vector info to intr_info if L1 asks us to) retrieves the interrupt that belongs to L1 before vmcs01 is loaded. This will lead to problems in the next patch, which would write to SVI of vmcs02 instead of vmcs01 (SVI of vmcs02 doesn't make sense because L2 runs without APICv). Reviewed-by: Paolo Bonzini Tested-by: Liu, RongrongX Tested-by: Felipe Reyes Fixes: 77b0f5d67ff2781f36831cba79674c3e97bd7acf Cc: stable@vger.kernel.org Signed-off-by: Wanpeng Li [Move tracepoint as well. - Paolo] Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e618f34bde2d..bfe11cf124a1 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8754,6 +8754,8 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info, exit_qualification); + vmx_load_vmcs01(vcpu); + if ((exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT) && nested_exit_intr_ack_set(vcpu)) { int irq = kvm_cpu_get_interrupt(vcpu); @@ -8769,8 +8771,6 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, vmcs12->vm_exit_intr_error_code, KVM_ISA_VMX); - vmx_load_vmcs01(vcpu); - vm_entry_controls_init(vmx, vmcs_read32(VM_ENTRY_CONTROLS)); vm_exit_controls_init(vmx, vmcs_read32(VM_EXIT_CONTROLS)); vmx_segment_cache_clear(vmx); -- 2.20.1