[PATCH v4 60/75] x86/sev-es: Handle MWAIT/MWAITX Events

[Joerg Roedel]

From: Tom Lendacky <thomas.lendacky@xxxxxxx>

Implement a handler for #VC exceptions caused by MWAIT and MWAITX
instructions.

Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
[ jroedel@xxxxxxx: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 arch/x86/kernel/sev-es.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index c0977bdc400e..541f8994eb21 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -888,6 +888,13 @@ static enum es_result vc_handle_monitor(struct ghcb *ghcb,
 	return ES_OK;
 }
 
+static enum es_result vc_handle_mwait(struct ghcb *ghcb,
+				      struct es_em_ctxt *ctxt)
+{
+	/* Treat the same as MONITOR/MONITORX */
+	return ES_OK;
+}
+
 static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
 					 struct ghcb *ghcb,
 					 unsigned long exit_code)
@@ -927,6 +934,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
 	case SVM_EXIT_MONITOR:
 		result = vc_handle_monitor(ghcb, ctxt);
 		break;
+	case SVM_EXIT_MWAIT:
+		result = vc_handle_mwait(ghcb, ctxt);
+		break;
 	case SVM_EXIT_NPF:
 		result = vc_handle_mmio(ghcb, ctxt);
 		break;
-- 
2.27.0