From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: wei.huang2@amd.com, cavery@redhat.com, vkuznets@redhat.com,
Sean Christopherson <sean.j.christopherson@intel.com>,
Oliver Upton <oupton@google.com>,
Jim Mattson <jmattson@google.com>
Subject: [PATCH v2 01/22] KVM: SVM: introduce nested_run_pending
Date: Fri, 24 Apr 2020 13:23:55 -0400 [thread overview]
Message-ID: <20200424172416.243870-2-pbonzini@redhat.com> (raw)
In-Reply-To: <20200424172416.243870-1-pbonzini@redhat.com>
We want to inject vmexits immediately from svm_check_nested_events,
so that the interrupt/NMI window requests happen in inject_pending_event
right after it returns.
This however has the same issue as in vmx_check_nested_events, so
introduce a nested_run_pending flag with the exact same purpose
of delaying vmexit injection after the vmentry.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/svm/nested.c | 3 ++-
arch/x86/kvm/svm/svm.c | 1 +
arch/x86/kvm/svm/svm.h | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index a7c3b3030e59..51cfab68428d 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -413,6 +413,7 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
copy_vmcb_control_area(hsave, vmcb);
+ svm->nested.nested_run_pending = 1;
enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb, &map);
if (!nested_svm_vmrun_msrpm(svm)) {
@@ -792,7 +793,8 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
bool block_nested_events =
- kvm_event_needs_reinjection(vcpu) || svm->nested.exit_required;
+ kvm_event_needs_reinjection(vcpu) || svm->nested.exit_required ||
+ svm->nested.nested_run_pending;
if (kvm_cpu_has_interrupt(vcpu) && nested_exit_on_intr(svm)) {
if (block_nested_events)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c86f7278509b..77440b5953e3 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3417,6 +3417,7 @@ static enum exit_fastpath_completion svm_vcpu_run(struct kvm_vcpu *vcpu)
sync_cr8_to_lapic(vcpu);
svm->next_rip = 0;
+ svm->nested.nested_run_pending = 0;
svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 98c2890d561d..435f3328c99c 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -97,6 +97,10 @@ struct nested_state {
/* A VMEXIT is required but not yet emulated */
bool exit_required;
+ /* A VMRUN has started but has not yet been performed, so
+ * we cannot inject a nested vmexit yet. */
+ bool nested_run_pending;
+
/* cache for intercepts of the guest */
u32 intercept_cr;
u32 intercept_dr;
--
2.18.2
next prev parent reply other threads:[~2020-04-24 17:25 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-24 17:23 [PATCH v2 00/22] KVM: Event fixes and cleanup Paolo Bonzini
2020-04-24 17:23 ` Paolo Bonzini [this message]
2020-04-24 17:23 ` [PATCH v2 02/22] KVM: SVM: leave halted state on vmexit Paolo Bonzini
2020-04-24 17:41 ` Oliver Upton
2020-04-24 17:23 ` [PATCH v2 03/22] KVM: SVM: immediately inject INTR vmexit Paolo Bonzini
2020-05-21 12:50 ` Vitaly Kuznetsov
2020-05-21 14:08 ` Paolo Bonzini
2020-05-21 21:04 ` Paolo Bonzini
2020-04-24 17:23 ` [PATCH v2 04/22] KVM: SVM: Implement check_nested_events for NMI Paolo Bonzini
2020-04-24 17:23 ` [PATCH v2 05/22] KVM: nVMX: Preserve exception priority irrespective of exiting behavior Paolo Bonzini
2020-04-24 17:24 ` [PATCH v2 06/22] KVM: nVMX: Open a window for pending nested VMX preemption timer Paolo Bonzini
2020-04-24 17:24 ` [PATCH v2 07/22] KVM: x86: Set KVM_REQ_EVENT if run is canceled with req_immediate_exit set Paolo Bonzini
2020-04-24 17:24 ` [PATCH v2 08/22] KVM: x86: Make return for {interrupt_nmi,smi}_allowed() a bool instead of int Paolo Bonzini
2020-04-24 17:24 ` [PATCH v2 09/22] KVM: x86: replace is_smm checks with kvm_x86_ops.smi_allowed Paolo Bonzini
2020-04-24 17:29 ` [PATCH v2 00/22] KVM: Event fixes and cleanup Sean Christopherson
2020-04-24 21:02 ` Oliver Upton
2020-04-24 21:05 ` Sean Christopherson
2020-04-25 7:21 ` Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 10/22] KVM: nVMX: Report NMIs as allowed when in L2 and Exit-on-NMI is set Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 11/22] KVM: nSVM: " Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 12/22] KVM: nSVM: Move SMI vmexit handling to svm_check_nested_events() Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 13/22] KVM: VMX: Split out architectural interrupt/NMI blocking checks Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 14/22] KVM: SVM: Split out architectural interrupt/NMI/SMI " Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 15/22] KVM: nVMX: Preserve IRQ/NMI priority irrespective of exiting behavior Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 16/22] KVM: nVMX: Prioritize SMI over nested IRQ/NMI Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 17/22] KVM: nSVM: Report interrupts as allowed when in L2 and exit-on-interrupt is set Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 18/22] KVM: nSVM: Preserve IRQ/NMI/SMI priority irrespective of exiting behavior Paolo Bonzini
2020-04-25 7:01 ` [PATCH v2 19/22] KVM: x86: WARN on injected+pending exception even in nested case Paolo Bonzini
2020-04-25 7:02 ` [PATCH v2 20/22] KVM: VMX: Use vmx_interrupt_blocked() directly from vmx_handle_exit() Paolo Bonzini
2020-04-25 7:02 ` [PATCH v2 21/22] KVM: VMX: Use vmx_get_rflags() to query RFLAGS in vmx_interrupt_blocked() Paolo Bonzini
2020-04-25 7:02 ` [PATCH v2 22/22] KVM: x86: Replace late check_nested_events() hack with more precise fix Paolo Bonzini
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