Jim Mattson e2ffe85b6d KVM: x86: Introduce KVM_X86_QUIRK_VMCS12_ALLOW_FREEZE_IN_SMM ... Add KVM_X86_QUIRK_VMCS12_ALLOW_FREEZE_IN_SMM to allow L1 to set FREEZE_IN_SMM in vmcs12's GUEST_IA32_DEBUGCTL field, as permitted prior to commit 6b1dd26544 ("KVM: VMX: Preserve host's DEBUGCTLMSR_FREEZE_IN_SMM while running the guest"). Enable the quirk by default for backwards compatibility (like all quirks); userspace can disable it via KVM_CAP_DISABLE_QUIRKS2 for consistency with the constraints on WRMSR(IA32_DEBUGCTL). Note that the quirk only bypasses the consistency check. The vmcs02 bit is still owned by the host, and PMCs are not frozen during virtualized SMM. In particular, if a host administrator decides that PMCs should not be frozen during physical SMM, then L1 has no say in the matter. Fixes: 095686e6fc ("KVM: nVMX: Check vmcs12->guest_ia32_debugctl on nested VM-Enter") Cc: stable@vger.kernel.org Signed-off-by: Jim Mattson <jmattson@google.com> Link: https://patch.msgid.link/20260205231537.1278753-1-jmattson@google.com [sean: tag for stable@, clean-up and fix goofs in the comment and docs] Signed-off-by: Sean Christopherson <seanjc@google.com> [Rename quirk. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2026-03-11 18:41:11 +01:00
..
acrn	docs: acrn: Introduce ACRN	2021-02-09 10:58:18 +01:00
coco	ARM:	2024-07-20 12:41:03 -07:00
hyperv	Documentation: hyperv: Confidential VMBus	2025-11-15 06:18:14 +00:00
kvm	KVM: x86: Introduce KVM_X86_QUIRK_VMCS12_ALLOW_FREEZE_IN_SMM	2026-03-11 18:41:11 +01:00
uml	um: Remove legacy network transport infrastructure	2025-05-05 10:26:59 +02:00
guest-halt-polling.rst	Documentation: virt: correct location of haltpoll module params	2023-06-16 08:17:21 -06:00
index.rst	Documentation: use a source-read extension for the index link boilerplate	2026-01-23 11:59:34 -07:00
ne_overview.rst	nitro_enclaves: Update documentation for Arm64 support	2021-09-14 11:11:20 +02:00
paravirt_ops.rst	Documentation: virt: Clean up paravirt_ops doc	2023-06-19 12:09:54 +02:00