KVM: SVM: Add support for SVM instruction address check change

KVM: SVM: Add support for SVM instruction address check change

New AMD CPUs have a change that checks #VMEXIT intercept on special SVM
instructions before checking their EAX against reserved memory region.
This change is indicated by CPUID_0x8000000A_EDX[28]. If it is 1, #VMEXIT
is triggered before #GP. KVM doesn't need to intercept and emulate #GP
faults as #GP is supposed to be triggered.

Co-developed-by: Bandan Das <[email protected]>
Signed-off-by: Bandan Das <[email protected]>
Signed-off-by: Wei Huang <[email protected]>
Reviewed-by: Maxim Levitsky <[email protected]>
Message-Id: <20210126081831[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>