[PATCH v3 59/75] x86/sev-es: Handle MONITOR/MONITORX Events

Joerg Roedel
Tue, 28 Apr 2020 15:17:09 -0000

From: Tom Lendacky <thomas.lendacky at amd.com>

Implement a handler for #VC exceptions caused by MONITOR and MONITORX
instructions.

Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
[ jroedel at suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel <jroedel at suse.de>
Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 arch/x86/kernel/sev-es.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 601554e6360f..1a961714cd1b 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -824,6 +824,22 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb,
struct es_em_ctxt *ctxt
 	return ES_OK;
 }

+static enum es_result vc_handle_monitor(struct ghcb *ghcb,
+					struct es_em_ctxt *ctxt)
+{
+	phys_addr_t monitor_pa;
+	pgd_t *pgd;
+
+	pgd = __va(read_cr3_pa());
+	monitor_pa = vc_slow_virt_to_phys(ghcb, ctxt->regs->ax);
+
+	ghcb_set_rax(ghcb, monitor_pa);
+	ghcb_set_rcx(ghcb, ctxt->regs->cx);
+	ghcb_set_rdx(ghcb, ctxt->regs->dx);
+
+	return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MONITOR, 0, 0);
+}
+
 static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
 					 struct ghcb *ghcb,
 					 unsigned long exit_code)
@@ -860,6 +876,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt
*ctxt,
 	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;
--
2.17.1