[v3,60/75] x86/sev-es: Handle MWAIT/MWAITX Events
diff mbox series

Message ID 20200428151725.31091-61-joro@8bytes.org
State New
Headers show
Series
  • x86: SEV-ES Guest Support
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Commit Message

Joerg Roedel April 28, 2020, 3:17 p.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(+)

Patch
diff mbox series

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 1a961714cd1b..d5d4804d1e17 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -840,6 +840,15 @@  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)
@@ -879,6 +888,9 @@  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;