On 20/1/23 16:12, Nikunj A. Dadhania wrote:
On 20/01/23 08:40, Alexey Kardashevskiy wrote:
With MSR_AMD64_SEV_DEBUG_SWAP enabled, the VM should not get #VC
events for DR7 read/write which it rather avoided.
SNP guest feature negotiation patch is part of tip now: https://lore.kernel.org/lkml/167414649850.4906.1693185384677559889.tip-bot2@tip-bot2/
Worth mentioning it is tip/x86/urgent (which does not have
X86_FEATURE_NO_NESTED_DATA_BP), not tip/master (which has
X86_FEATURE_NO_NESTED_DATA_BP).
MSR_AMD64_SNP_DEBUG_SWAP is already defined. As this requires guest side changes, please add MSR_AMD64_SNP_DEBUG_SWAP as part of SNP_FEATURES_PRESENT bit mask.
It is MSR_AMD64_SEV_DEBUG_SWAP (SEV, not SNP), it is an SEV-ES thing.
Why is that feature negotiation SNP-only and not SEV?
--
Alexey
