From 91b7130cb6606d8c6b3b77e54426b3f3a83f48b1 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 22 May 2020 12:28:52 -0400 Subject: [PATCH] KVM: SVM: preserve VGIF across VMCB switch There is only one GIF flag for the whole processor, so make sure it is not clobbered when switching to L2 (in which case we also have to include the V_GIF_ENABLE_MASK, lest we confuse enable_gif/disable_gif/gif_set). When going back, L1 could in theory have entered L2 without issuing a CLGI so make sure the svm_set_gif is done last, after svm->vmcb->control.int_ctl has been copied back from hsave. Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm/nested.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 7e4a506..6c7f0bf 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -293,6 +293,7 @@ static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_v static void nested_prepare_vmcb_control(struct vcpu_svm *svm) { + const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK; if (svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) nested_svm_init_mmu_context(&svm->vcpu); @@ -308,7 +309,10 @@ static void nested_prepare_vmcb_control(struct vcpu_svm *svm) svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset + svm->nested.ctl.tsc_offset; - svm->vmcb->control.int_ctl = svm->nested.ctl.int_ctl | V_INTR_MASKING_MASK; + svm->vmcb->control.int_ctl = + (svm->nested.ctl.int_ctl & ~mask) | + (svm->nested.hsave->control.int_ctl & mask); + svm->vmcb->control.virt_ext = svm->nested.ctl.virt_ext; svm->vmcb->control.int_vector = svm->nested.ctl.int_vector; svm->vmcb->control.int_state = svm->nested.ctl.int_state; -- 2.7.4