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(parent: 1893c94) | patch
KVM: x86: Warn on zero-size save state for valid CPUID 0xD.N sub-leaf
authorSean Christopherson <sean.j.christopherson@intel.com>
Mon, 2 Mar 2020 23:56:11 +0000 (15:56 -0800)
committerPaolo Bonzini <pbonzini@redhat.com>
Mon, 16 Mar 2020 16:57:59 +0000 (17:57 +0100)
commit91001d403ad39b9c800a3b805bf48c5b027ecac5
treebd9fa524c9d4b5b88715be3bd720c34884447085tree | snapshot
parent1893c9415ae8cad20da863c41bdf308e56a2dd67commit | diff
KVM: x86: Warn on zero-size save state for valid CPUID 0xD.N sub-leaf

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>
arch/x86/kvm/cpuid.c diff | blob | history
Domain: System / Kernel;