From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Mon, 7 Sep 2020 15:15:58 +0200
Subject: x86/sev-es: Handle MONITOR/MONITORX Events
Git-commit: 0c2fd2ef64ef1a91d81c2f61309735ac438b68a4
Patch-mainline: v5.10-rc1
References: jsc#SLE-14337
Implement a handler for #VC exceptions caused by MONITOR and MONITORX
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/20200907131613.12703-58-joro@8bytes.org
---
arch/x86/kernel/sev-es.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -874,6 +874,16 @@ static enum es_result vc_handle_rdpmc(st
return ES_OK;
}
+static enum es_result vc_handle_monitor(struct ghcb *ghcb,
+ struct es_em_ctxt *ctxt)
+{
+ /*
+ * Treat it as a NOP and do not leak a physical address to the
+ * hypervisor.
+ */
+ return ES_OK;
+}
+
static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
struct ghcb *ghcb,
unsigned long exit_code)
@@ -910,6 +920,9 @@ static enum es_result vc_handle_exitcode
case SVM_EXIT_WBINVD:
result = vc_handle_wbinvd(ghcb, ctxt);
break;
+ case SVM_EXIT_MONITOR:
+ result = vc_handle_monitor(ghcb, ctxt);
+ break;
case SVM_EXIT_NPF:
result = vc_handle_mmio(ghcb, ctxt);
break;