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

0ddfb1cf · Tom Lendacky <[email protected]> · 2020-09-25 08:38:26 -05:00

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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Joerg Roedel <[email protected]>
Link: https://lkml.kernel.org/r/ba84deabdf44a7a880454fb351d189c6ad79d4ba.1601041106.git.thomas.lendacky@amd.com

Commit: 0ddfb1cf3b6b07c97cff16ea69931d986f9622ee
Parents: f5ed7775

Changes

1 files changed · +1 −1

File	Status	Add	Del	Content
arch/x86/kernel/sev-es.c	modified	+1	−1	View file

arch/x86/kernel/sev-es.c

View file

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 6fcfdd3..4a96726 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -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);
 }