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x86/sev-es: Use GHCB accessor for setting the MMIO scratch buffer

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Use ghcb_set_sw_scratch() to set the GHCB scratch field, which will also
set the corresponding bit in the GHCB valid_bitmap field to denote that
sw_scratch is actually valid.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Link: https://lkml.kernel.org/r/ba84deabdf44a7a880454fb351d189c6ad79d4ba.1601041106.git.thomas.lendacky@amd.com
This commit is contained in:
Tom Lendacky 2020-09-25 08:38:26 -05:00 committed by Borislav Petkov
parent f5ed777586
commit 0ddfb1cf3b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/sev-es.c
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@ -751,7 +751,7 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt,
/* Can never be greater than 8 */
exit_info_2 = bytes;
ghcb->save.sw_scratch = ghcb_pa + offsetof(struct ghcb, shared_buffer);
ghcb_set_sw_scratch(ghcb, ghcb_pa + offsetof(struct ghcb, shared_buffer));
return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2);
}