[Part2 PATCH v9 31/38] KVM: SVM: Add support for SEV GUEST_STATUS command

[Brijesh Singh]

The command is used for querying the SEV guest information.

Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: "Radim Krčmář" <rkrc...@redhat.com>
Cc: Joerg Roedel <j...@8bytes.org>
Cc: Borislav Petkov <b...@suse.de>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: x...@kernel.org
Cc: k...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
Reviewed-by: Borislav Petkov <b...@suse.de>
---
 arch/x86/kvm/svm.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6a8d81311e9d..f5da2753790d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6133,6 +6133,36 @@ static int sev_launch_finish(struct kvm *kvm, struct 
kvm_sev_cmd *argp)
        return ret;
 }
 
+static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+       struct kvm_sev_info *sev = &kvm->arch.sev_info;
+       struct kvm_sev_guest_status params;
+       struct sev_data_guest_status *data;
+       int ret;
+
+       if (!sev_guest(kvm))
+               return -ENOTTY;
+
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       data->handle = sev->handle;
+       ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error);
+       if (ret)
+               goto e_free;
+
+       params.policy = data->policy;
+       params.state = data->state;
+       params.handle = data->handle;
+
+       if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, 
sizeof(params)))
+               ret = -EFAULT;
+e_free:
+       kfree(data);
+       return ret;
+}
+
 static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
 {
        struct kvm_sev_cmd sev_cmd;
@@ -6162,6 +6192,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user 
*argp)
        case KVM_SEV_LAUNCH_FINISH:
                r = sev_launch_finish(kvm, &sev_cmd);
                break;
+       case KVM_SEV_GUEST_STATUS:
+               r = sev_guest_status(kvm, &sev_cmd);
+               break;
        default:
                r = -EINVAL;
                goto out;
-- 
2.9.5