[v4] Add AMD Secure Nested Paging (SEV-SNP) support

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

Pankaj Gupta posted 31 patches 5 months, 4 weeks ago

Diff against v1 v2 v3
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Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Peter Xu <peterx@redhat.com>, David Hildenbrand <david@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Cornelia Huck <cohuck@redhat.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>

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

Posted by Pankaj Gupta 5 months, 4 weeks ago

From: Michael Roth <michael.roth@amd.com>

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>
---
 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