KVM: x86/xen: Fix get_attr of KVM_XEN_ATTR_TYPE_SHARED_INFO

In commit 319afe68567b ("KVM: xen: do not use struct gfn_to_hva_cache") we
stopped storing this in-kernel as a GPA, and started storing it as a GFN.
Which means we probably should have stopped calling gpa_to_gfn() on it
when userspace asks for it back.

Cc: stable@vger.kernel.org
Fixes: 319afe68567b ("KVM: xen: do not use struct gfn_to_hva_cache")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20211115165030.7422-2-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 9ea9c3d..79090db 100644 (file)
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -282,7 +282,7 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
                break;
 
        case KVM_XEN_ATTR_TYPE_SHARED_INFO:
-               data->u.shared_info.gfn = gpa_to_gfn(kvm->arch.xen.shinfo_gfn);
+               data->u.shared_info.gfn = kvm->arch.xen.shinfo_gfn;
                r = 0;
                break;