From 0612c7ed587422ec7e07c27c8ca11b89c7aa8b02 Mon Sep 17 00:00:00 2001
From: Michael Roth <michael.roth@amd.com>
Date: Thu, 30 May 2024 06:16:43 -0500
Subject: [PATCH 077/100] i386/sev: Enable KVM_HC_MAP_GPA_RANGE hcall for SNP
 guests

RH-Author: Paolo Bonzini <pbonzini@redhat.com>
RH-MergeRequest: 245: SEV-SNP support
RH-Jira: RHEL-39544
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Bandan Das <bdas@redhat.com>
RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
RH-Commit: [77/91] 3c494eb54499c24121cc2c47045626478b8bb41e (bonzini/rhel-qemu-kvm)

KVM will forward GHCB page-state change requests to userspace in the
form of KVM_HC_MAP_GPA_RANGE, so make sure the hypercall handling is
enabled for SNP guests.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@amd.com>
Message-ID: <20240530111643.1091816-32-pankaj.gupta@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit e3cddff93c1f88fea3b26841e792dc0be6b6fae8)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/sev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index eaf5fc6c6b..abb63062ac 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -14,6 +14,7 @@
 #include "qemu/osdep.h"
 
 #include <linux/kvm.h>
+#include <linux/kvm_para.h>
 #include <linux/psp-sev.h>
 
 #include <sys/ioctl.h>
@@ -758,6 +759,10 @@ sev_snp_launch_start(SevCommonState *sev_common)
     trace_kvm_sev_snp_launch_start(start->policy,
                                    sev_snp_guest->guest_visible_workarounds);
 
+    if (!kvm_enable_hypercall(BIT_ULL(KVM_HC_MAP_GPA_RANGE))) {
+            return 1;
+    }
+
     rc = sev_ioctl(sev_common->sev_fd, KVM_SEV_SNP_LAUNCH_START,
                    start, &fw_error);
     if (rc < 0) {
-- 
2.39.3