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When a guest is running under SEV-ES, the hypervisor cannot access the
guest register state. There are numerous places in the KVM code where
certain registers are accessed that are not allowed to be accessed (e.g.
RIP, CR0, etc). Add checks to prevent register accesses and add intercept
update support at various points within the KVM code.
Also, when handling a VMGEXIT, exceptions are passed back through the
GHCB. Since the RDMSR/WRMSR intercepts (may) inject a #GP on error,
update the SVM intercepts to handle this for SEV-ES guests.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[Redo MSR part using the .complete_emulated_msr callback. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
f1c6366e30