x86/sev-es: Handle MWAIT/MWAITX Events

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>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-59-joro@8bytes.org

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index b9976e710d77df42836be1d540f9679e4bfe76b7..2aea903ceb42e75a93a266d9727208be5d85b70b 100644 (file)
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -882,6 +882,13 @@ 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)
@@ -921,6 +928,9 @@ 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;