diff mbox series

[57/70] x86/sev-es: Handle MWAIT/MWAITX Events

Message ID 20200319091407.1481-58-joro@8bytes.org (mailing list archive)
State New, archived
Headers show
Series x86: SEV-ES Guest Support | expand

Commit Message

Joerg Roedel March 19, 2020, 9:13 a.m. UTC 
From: Tom Lendacky <thomas.lendacky@amd.com>

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

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/kernel/sev-es.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 6bd8bc9f2e66..0ccbcc02e6f2 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -723,6 +723,15 @@  static enum es_result vc_handle_monitor(struct ghcb *ghcb,
 	return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MONITOR, 0, 0);
 }
 
+static enum es_result vc_handle_mwait(struct ghcb *ghcb,
+				      struct es_em_ctxt *ctxt)
+{
+	ghcb_set_rax(ghcb, ctxt->regs->ax);
+	ghcb_set_rcx(ghcb, ctxt->regs->cx);
+
+	return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MWAIT, 0, 0);
+}
+
 static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
 					 struct ghcb *ghcb,
 					 unsigned long exit_code,
@@ -763,6 +772,9 @@  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;