Commit 0c2fd2ef authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov
Browse files

x86/sev-es: Handle MONITOR/MONITORX Events 



Implement a handler for #VC exceptions caused by MONITOR and MONITORX
instructions.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-58-joro@8bytes.org
parent 8b4ce837

arch/x86/kernel/sev-es.c

+13 −0
Original line number Diff line number Diff line
@@ -872,6 +872,16 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt 
	return ES_OK;

}



static enum es_result vc_handle_monitor(struct ghcb *ghcb,

					struct es_em_ctxt *ctxt)

{

	/*

	 * Treat it as a NOP and do not leak a physical address to the

	 * hypervisor.

	 */

	return ES_OK;

}



static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,

					 struct ghcb *ghcb,

					 unsigned long exit_code)
@@ -908,6 +918,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, 
	case SVM_EXIT_WBINVD:

		result = vc_handle_wbinvd(ghcb, ctxt);

		break;

	case SVM_EXIT_MONITOR:

		result = vc_handle_monitor(ghcb, ctxt);

		break;

	case SVM_EXIT_NPF:

		result = vc_handle_mmio(ghcb, ctxt);

		break;