From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH 00/11] KVM: fix issues with stale control fields
Date: Mon, 28 Sep 2026 10:01:54 -0700 [thread overview]
Message-ID: <arqdghk8eIxk1A4A@google.com> (raw)
In-Reply-To: <20260926061135.714158-1-pbonzini@redhat.com>
On Sat, Sep 26, 2026, Paolo Bonzini wrote:
> > Fix two bugs where the guest could do stupid things on purpose to
> > cause problems in the host.
> >
> > Patches 1-5 cover cases where actions done through VMCB control fields
> > have to be redone if VMRUN fails. In particular, failed VMRUNs can
> > cause pending TLB flushes to be dropped.
> >
> > Patch 6 fixes a case where eVMCS execution controls can cause the
> > host to use a stale MSR permission bitmap. Patches 7-11 are tests
> > for nested x2APIC; don't run them on an unpatched kernel.
>
> In addition to what was reported by Sashiko, the test does not pass on
> SVM. Fixed as follows:
Thanks for cleaning up the mess! I was definitely getting too greedy trying to
get bonus coverage on AMD (and I've been ignoring the SVM failures in my local
testing for an embarrasingly long time).
next prev parent reply other threads:[~2026-09-28 17:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-26 5:32 Paolo Bonzini
2026-09-26 5:32 ` [PATCH 01/11] KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN Paolo Bonzini
2026-09-26 5:32 ` [PATCH 02/11] KVM: SVM: Update control fields on #VMEXIT if and only if VMRUN succeeded Paolo Bonzini
2026-09-26 5:32 ` [PATCH 03/11] KVM: SVM: Don't mark ASID fields as dirty when setting control.tlb_ctl Paolo Bonzini
2026-09-26 5:32 ` [PATCH 04/11] KVM: SVM: Sync guest's PERF_CNTR_GLOBAL_CTL from h/w only on successful VMRUN Paolo Bonzini
2026-09-26 5:32 ` [PATCH 05/11] KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted Paolo Bonzini
2026-09-26 5:32 ` [PATCH 06/11] KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified Paolo Bonzini
2026-09-26 5:32 ` [PATCH 07/11] KVM: selftests: Add x2APIC MSR test for inhibiting APICv while nested Paolo Bonzini
2026-09-26 5:32 ` [PATCH 08/11] KVM: selftests: Run the nested x2APIC with and without APICv being inhibited in L2 Paolo Bonzini
2026-09-26 5:32 ` [PATCH 09/11] KVM: selftests: Verify that L0's TPR doesn't get clobbered Paolo Bonzini
2026-09-26 5:32 ` [PATCH 10/11] KVM: selftests: Extend nested x2APIC test to validate disabling x2APIC virt Paolo Bonzini
2026-09-26 5:32 ` [PATCH 11/11] KVM: selftests: Extend nested x2APIC test to validate using eVMCS for vmcs12 Paolo Bonzini
2026-09-26 6:11 ` [PATCH 00/11] KVM: fix issues with stale control fields Paolo Bonzini
2026-09-28 17:01 ` Sean Christopherson [this message]
2026-09-26 6:12 ` Paolo Bonzini
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