Commit 0ddfb1cf authored Sep 25, 2020 by Tom Lendacky Committed by Borislav Petkov Sep 25, 2020

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



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

parent f5ed7775

arch/x86/kernel/sev-es.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}

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