x86/sev: Do not handle #VC for DR7 read/write
With MSR_AMD64_SEV_DEBUG_SWAP enabled, the guest is not expected to receive a #VC for reads or writes of DR7. Update the SNP_FEATURES_PRESENT mask with MSR_AMD64_SNP_DEBUG_SWAP so an SNP guest doesn't gracefully terminate during SNP feature negotiation if MSR_AMD64_SEV_DEBUG_SWAP is enabled. Since a guest is not expected to receive a #VC on DR7 accesses when MSR_AMD64_SEV_DEBUG_SWAP is enabled, return an error from the #VC handler in this situation. Signed-off-by:Alexey Kardashevskiy <aik@amd.com> Signed-off-by:
Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by:
Carlos Bilbao <carlos.bilbao@amd.com> Reviewed-by:
Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by:
Pankaj Gupta <pankaj.gupta@amd.com> Link: https://lore.kernel.org/r/20230816022122.981998-1-aik@amd.com
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2ccdd1b1
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