linux-kernel - [PATCH 0/3] KVM: x86: Fix supported VM

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Date: Tue, 23 Apr 2024 09:53:25 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] KVM: x86: Fix supported VM_TYPES caps

Fix a goof where KVM fails to re-initialize the set of supported VM types,
resulting in KVM overreporting the set of supported types when a vendor
module is reloaded with incompatible settings.  E.g. unload kvm-intel.ko,
reload with ept=0, and KVM will incorrectly treat SW_PROTECTED_VM as
supported.

Fix a similar long-standing bug with supported_mce_cap that is much less
benign, and then harden against us making the same mistake in the future.

Sean Christopherson (3):
  KVM: x86: Fully re-initialize supported_vm_types on vendor module load
  KVM: x86: Fully re-initialize supported_mce_cap on vendor module load
  KVM: x86: Explicitly zero kvm_caps during vendor module load

 arch/x86/kvm/x86.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

base-commit: a96cb3bf390eebfead5fc7a2092f8452a7997d1b
-- 
2.44.0.769.g3c40516874-goog