Messages in this thread | | | From | Arvind Sankar <> | Date | Wed, 28 Oct 2020 12:50:07 -0400 | Subject | Re: [PATCH v3 1/5] x86/boot/compressed/64: Introduce sev_status |
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On Wed, Oct 28, 2020 at 09:23:52AM +0100, Joerg Roedel wrote: > On Mon, Oct 26, 2020 at 07:27:06PM +0100, Borislav Petkov wrote: > > A couple of lines above you call get_sev_encryption_bit() which already > > reads MSR_AMD64_SEV. Why not set sev_status there too instead of reading > > that MSR again here? > > > > It can read that MSR once and use sev_status(%rip) from then on to avoid > > reading that MSR multiple times... > > Right, makes sense. I updated the patch.
Hang on, get_sev_encryption_bit() is also called from startup_32(), so it can't contain any 64-bit instructions to set sev_status.
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