KVM: x86: Ignore cpuid faulting in SMM

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The Intel Virtualization Technology FlexMigration Application Note says,
"When CPUID faulting is enabled, all executions of the CPUID instruction
outside system-management mode (SMM) cause a general-protection exception
(#GP(0)) if the current privilege level (CPL) is greater than 0."

Always allow the execution of CPUID in SMM.

Fixes: db2336a804 ("KVM: x86: virtualize cpuid faulting")
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260210234613.1383279-1-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Jim Mattson 2026-02-10 15:45:42 -08:00 • committed by Sean Christopherson

parent e907b4e724

commit 690dc03859

2 changed files with 5 additions and 4 deletions

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3

arch/x86/kvm/cpuid.c

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6

arch/x86/kvm/emulate.c

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