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Subject[PATCH 48/62] x86/sev-es: Handle MONITOR/MONITORX Events
Date
From: Tom Lendacky <thomas.lendacky@amd.com>

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>
---
arch/x86/kernel/sev-es.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index d5a14f277adb..865f510d11ba 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -318,6 +318,21 @@ static enum es_result handle_invd(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
return ghcb_hv_call(ghcb, ctxt, SVM_EXIT_INVD, 0, 0);
}

+static enum es_result 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 = es_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 ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MONITOR, 0, 0);
+}
+
static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt,
struct ghcb *ghcb,
unsigned long exit_code,
@@ -354,6 +369,9 @@ static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt,
case SVM_EXIT_WBINVD:
result = handle_wbinvd(ghcb, ctxt);
break;
+ case SVM_EXIT_MONITOR:
+ result = handle_monitor(ghcb, ctxt);
+ break;
case SVM_EXIT_NPF:
result = handle_mmio(ghcb, ctxt);
break;
--
2.17.1
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