[PATCH v4 31/31] i386/sev: Enable KVM_HC_MAP_GPA_RANGE hcall for SNP guests

[Pankaj Gupta <pankaj.gupta@xxxxxxx>]

From: Michael Roth <michael.roth@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx>
---
 target/i386/sev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 7d2f67e2f3..c1872ce3a4 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>
@@ -774,6 +775,10 @@ 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) {
-- 
2.34.1