[PATCH v3 60/75] x86/sev-es: Handle MWAIT/MWAITX Events

Joerg Roedel
2020-04-28T15:17:10Z

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 --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;
--
2.17.1