Re: [Question PATCH kernel] x86/amd/sev/nmi+vc: Fix stack handling (why is this happening?)

[Joerg Roedel]

On Mon, Jan 30, 2023 at 09:30:38AM -0800, H. Peter Anvin wrote:
> It's somewhat odd to me that reading %dr7 is volatile, but %dr6 is
> not... %dr6 is the status register!

The reason is that on SEV-ES only accesses to DR7 will cause #VC
exceptions, DR0-DR6 are not intercepted.

Regards,

	Joerg