From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Jim Mattson <jmattson@google.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Oliver Upton <oupton@google.com>, Peter Shier <pshier@google.com>
Subject: [PATCH v5 16/27] KVM: x86: Use kvm_queue_exception_e() to queue #DF
Date: Tue, 30 Aug 2022 23:16:03 +0000 [thread overview]
Message-ID: <20220830231614.3580124-17-seanjc@google.com> (raw)
In-Reply-To: <20220830231614.3580124-1-seanjc@google.com>
Queue #DF by recursing on kvm_multiple_exception() by way of
kvm_queue_exception_e() instead of open coding the behavior. This will
allow KVM to Just Work when a future commit moves exception interception
checks (for L2 => L1) into kvm_multiple_exception().
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/x86.c | 21 +++++++++------------
1 file changed, 9 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bed42a75b515..c19658b7be23 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -667,25 +667,22 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
}
class1 = exception_class(prev_nr);
class2 = exception_class(nr);
- if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
- || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
+ if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) ||
+ (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
/*
- * Generate double fault per SDM Table 5-5. Set
- * exception.pending = true so that the double fault
- * can trigger a nested vmexit.
+ * Synthesize #DF. Clear the previously injected or pending
+ * exception so as not to incorrectly trigger shutdown.
*/
- vcpu->arch.exception.pending = true;
vcpu->arch.exception.injected = false;
- vcpu->arch.exception.has_error_code = true;
- vcpu->arch.exception.vector = DF_VECTOR;
- vcpu->arch.exception.error_code = 0;
- vcpu->arch.exception.has_payload = false;
- vcpu->arch.exception.payload = 0;
- } else
+ vcpu->arch.exception.pending = false;
+
+ kvm_queue_exception_e(vcpu, DF_VECTOR, 0);
+ } else {
/* replace previous exception with a new one in a hope
that instruction re-execution will regenerate lost
exception */
goto queue;
+ }
}
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
--
2.37.2.672.g94769d06f0-goog
next prev parent reply other threads:[~2022-08-30 23:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-30 23:15 [PATCH v5 00/27] KVM: x86: Event/exception fixes and cleanups Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 01/27] KVM: nVMX: Unconditionally purge queued/injected events on nested "exit" Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 02/27] KVM: VMX: Drop bits 31:16 when shoving exception error code into VMCS Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 03/27] KVM: x86: Don't check for code breakpoints when emulating on exception Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 04/27] KVM: x86: Allow clearing RFLAGS.RF on forced emulation to test code #DBs Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 05/27] KVM: x86: Suppress code #DBs on Intel if MOV/POP SS blocking is active Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 06/27] KVM: nVMX: Treat General Detect #DB (DR7.GD=1) as fault-like Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 07/27] KVM: nVMX: Prioritize TSS T-flag #DBs over Monitor Trap Flag Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 08/27] KVM: x86: Treat #DBs from the emulator as fault-like (code and DR7.GD=1) Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 09/27] KVM: x86: Use DR7_GD macro instead of open coding check in emulator Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 10/27] KVM: nVMX: Ignore SIPI that arrives in L2 when vCPU is not in WFS Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 11/27] KVM: nVMX: Unconditionally clear mtf_pending on nested VM-Exit Sean Christopherson
2022-08-30 23:15 ` [PATCH v5 12/27] KVM: VMX: Inject #PF on ENCLS as "emulated" #PF Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 13/27] KVM: x86: Rename kvm_x86_ops.queue_exception to inject_exception Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 14/27] KVM: x86: Make kvm_queued_exception a properly named, visible struct Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 15/27] KVM: x86: Formalize blocking of nested pending exceptions Sean Christopherson
2022-08-30 23:16 ` Sean Christopherson [this message]
2022-08-30 23:16 ` [PATCH v5 17/27] KVM: x86: Hoist nested event checks above event injection logic Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 18/27] KVM: x86: Evaluate ability to inject SMI/NMI/IRQ after potential VM-Exit Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 19/27] KVM: nVMX: Add a helper to identify low-priority #DB traps Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 20/27] KVM: nVMX: Document priority of all known events on Intel CPUs Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 21/27] KVM: x86: Morph pending exceptions to pending VM-Exits at queue time Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 22/27] KVM: x86: Treat pending TRIPLE_FAULT requests as pending exceptions Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 23/27] KVM: VMX: Update MTF and ICEBP comments to document KVM's subtle behavior Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 24/27] KVM: x86: Rename inject_pending_events() to kvm_check_and_inject_events() Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 25/27] KVM: selftests: Use uapi header to get VMX and SVM exit reasons/codes Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 26/27] KVM: selftests: Add an x86-only test to verify nested exception queueing Sean Christopherson
2022-08-30 23:16 ` [PATCH v5 27/27] KVM: x86: Allow force_emulation_prefix to be written without a reload Sean Christopherson
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