Maciej S. Szmigiero d02e48830e KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active ... Commit 3bbf3565f4 ("svm: Do not intercept CR8 when enable AVIC") inhibited pre-VMRUN sync of TPR from LAPIC into VMCB::V_TPR in sync_lapic_to_cr8() when AVIC is active. AVIC does automatically sync between these two fields, however it does so only on explicit guest writes to one of these fields, not on a bare VMRUN. This meant that when AVIC is enabled host changes to TPR in the LAPIC state might not get automatically copied into the V_TPR field of VMCB. This is especially true when it is the userspace setting LAPIC state via KVM_SET_LAPIC ioctl() since userspace does not have access to the guest VMCB. Practice shows that it is the V_TPR that is actually used by the AVIC to decide whether to issue pending interrupts to the CPU (not TPR in TASKPRI), so any leftover value in V_TPR will cause serious interrupt delivery issues in the guest when AVIC is enabled. Fix this issue by doing pre-VMRUN TPR sync from LAPIC into VMCB::V_TPR even when AVIC is enabled. Fixes: 3bbf3565f4 ("svm: Do not intercept CR8 when enable AVIC") Cc: stable@vger.kernel.org Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Reviewed-by: Naveen N Rao (AMD) <naveen@kernel.org> Link: https://lore.kernel.org/r/c231be64280b1461e854e1ce3595d70cde3a2e9d.1756139678.git.maciej.szmigiero@oracle.com [sean: tag for stable@] Signed-off-by: Sean Christopherson <seanjc@google.com>		2025-09-10 12:04:16 -07:00
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avic.c	KVM: SVM: Generate GA log IRQs only if the associated vCPUs is blocking	2025-06-23 09:50:52 -07:00
hyperv.c	KVM: nSVM: hyper-v: Enable L2 TLB flush	2022-11-18 12:59:18 -05:00
hyperv.h	KVM: x86: Make Hyper-V emulation optional	2023-12-07 09:34:57 -08:00
nested.c	KVM: x86: Provide a capability to disable APERF/MPERF read intercepts	2025-07-09 09:33:37 -07:00
pmu.c	KVM: x86: Replace (almost) all guest CPUID feature queries with cpu_caps	2024-12-18 14:20:15 -08:00
sev.c	KVM: SEV: don't check have_run_cpus in sev_writeback_caches()	2025-08-18 14:31:27 -07:00
svm.c	KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active	2025-09-10 12:04:16 -07:00
svm.h	Merge tag 'kvm-x86-sev-6.17' of https://github.com/kvm-x86/linux into HEAD	2025-07-29 08:36:46 -04:00
svm_onhyperv.c	KVM: x86: Move Hyper-V partition assist page out of Hyper-V emulation context	2023-12-07 09:34:01 -08:00
svm_onhyperv.h	s390:	2023-05-01 12:06:20 -07:00
svm_ops.h	work around gcc bugs with 'asm goto' with outputs	2024-02-09 15:57:48 -08:00
vmenter.S	x86/bugs: Add a Transient Scheduler Attacks mitigation	2025-06-17 17:17:02 +02:00