Re: [PATCH v2 05/12] x86/sev: Use GHCB protocol version 2 if supported
From: Borislav Petkov <bp@alien8.de>
Date: 2021-11-03 16:05:14
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On Mon, Sep 13, 2021 at 05:55:56PM +0200, Joerg Roedel wrote:
quoted hunk ↗ jump to hunk
From: Joerg Roedel <redacted> Check whether the hypervisor supports GHCB version 2 and use it if available. Signed-off-by: Joerg Roedel <redacted> --- arch/x86/boot/compressed/sev.c | 10 ++++++++-- arch/x86/include/asm/sev.h | 4 ++-- arch/x86/kernel/sev-shared.c | 17 ++++++++++++++--- 3 files changed, 24 insertions(+), 7 deletions(-)diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index 101e08c67296..7f8416f76be7 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c@@ -119,16 +119,22 @@ static enum es_result vc_read_mem(struct es_em_ctxt *ctxt, /* Include code for early handlers */ #include "../../kernel/sev-shared.c" +static unsigned int ghcb_protocol;
I guess you need to sync up with Brijesh on what to use: https://lore.kernel.org/r/20211008180453.462291-7-brijesh.singh@amd.com (local) And if ghcb_version there is __ro_after_init I think that's perfectly fine and doesn't need an accessor... Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette