On Tue, Apr 11, 2023, Alexey Kardashevskiy wrote: > 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@xxxxxxx> > Reviewed-by: Carlos Bilbao <carlos.bilbao@xxxxxxx> > Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx> > Reviewed-by: Pankaj Gupta <pankaj.gupta@xxxxxxx> > --- > Changes: > v4: > * rebased on top of SNP feature negotiation > > v2: > * use new bit definition > --- > arch/x86/boot/compressed/sev.c | 2 +- > arch/x86/kernel/sev.c | 6 ++++++ > 2 files changed, 7 insertions(+), 1 deletion(-) Can you post this separately (or bribe Boris to grab it)? IIUC, this has no dependency on the KVM enabling, i.e. can/should go through the tip tree without waiting for the KVM patches to be applied.
