From e081354d6aa7b67c6d0ef51ff8c428b6c261a6fe Mon Sep 17 00:00:00 2001 From: "Tambe, William" Date: Tue, 13 Nov 2018 16:51:20 +0000 Subject: [PATCH] KVM: nSVM: Fix nested guest support for PAUSE filtering. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Currently, the nested guest's PAUSE intercept intentions are not being honored. Instead, since the L0 hypervisor's pause_filter_count and pause_filter_thresh values are still in place, these values are used instead of those programmed in the VMCB by the L1 hypervisor. To honor the desired PAUSE intercept support of the L1 hypervisor, the L0 hypervisor must use the PAUSE filtering fields of the L1 hypervisor. This requires saving and restoring of both the L0 and L1 hypervisor's PAUSE filtering fields. Signed-off-by: William Tambe Signed-off-by: Radim Krčmář --- arch/x86/kvm/svm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c4377f02a33b..1a64844dcdfb 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3281,6 +3281,8 @@ static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *fr dst->event_inj_err = from->event_inj_err; dst->nested_cr3 = from->nested_cr3; dst->virt_ext = from->virt_ext; + dst->pause_filter_count = from->pause_filter_count; + dst->pause_filter_thresh = from->pause_filter_thresh; } static int nested_svm_vmexit(struct vcpu_svm *svm) @@ -3359,6 +3361,11 @@ static int nested_svm_vmexit(struct vcpu_svm *svm) nested_vmcb->control.event_inj = 0; nested_vmcb->control.event_inj_err = 0; + nested_vmcb->control.pause_filter_count = + svm->vmcb->control.pause_filter_count; + nested_vmcb->control.pause_filter_thresh = + svm->vmcb->control.pause_filter_thresh; + /* We always set V_INTR_MASKING and remember the old value in hflags */ if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK)) nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK; @@ -3536,6 +3543,11 @@ static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa, svm->vmcb->control.event_inj = nested_vmcb->control.event_inj; svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err; + svm->vmcb->control.pause_filter_count = + nested_vmcb->control.pause_filter_count; + svm->vmcb->control.pause_filter_thresh = + nested_vmcb->control.pause_filter_thresh; + nested_svm_unmap(page); /* Enter Guest-Mode */ -- 2.30.2