KVM: x86: Warn on zero-size save state for valid CPUID 0xD.N sub-leaf

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WARN if the save state size for a valid XCR0-managed sub-leaf is zero,
which would indicate a KVM or CPU bug.  Add a comment to explain why KVM
WARNs so the reader doesn't have to tease out the relevant bits from
Intel's SDM and KVM's XCR0/XSS code.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2020-03-02 15:56:11 -08:00 • committed by Paolo Bonzini

parent 1893c9415a

commit 91001d403a

1 changed files with 10 additions and 3 deletions

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arch/x86/kvm/cpuid.c

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