KVM: SVM: Mark VMCB_PERM_MAP as dirty on nested VMRUN

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commit 93c9e10738 upstream.

Mark the VMCB_PERM_MAP bit as dirty in nested_vmcb02_prepare_control()
on every nested VMRUN.

If L1 changes MSR interception (INTERCEPT_MSR_PROT) between two VMRUN
instructions on the same L1 vCPU, the msrpm_base_pa in the associated
vmcb02 will change, and the VMCB_PERM_MAP clean bit should be cleared.

Fixes: 4bb170a543 ("KVM: nSVM: do not mark all VMCB02 fields dirty on nested vmexit")
Reported-by: Matteo Rizzo <matteorizzo@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20250922162935.621409-2-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jim Mattson 2025-09-22 09:29:22 -07:00 • committed by Greg Kroah-Hartman

parent 5d018c1eac

commit 4dac2f321e

1 changed files with 1 additions and 0 deletions

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arch/x86/kvm/svm/nested.c

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