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Subject[RFC Part2 PATCH v3 17/26] KVM: SVM: Add support for SEV LAUNCH_MEASURE command
Date
The command is used to retrieve the measurement of memory encrypted
through the LAUNCH_UPDATE_DATA command. This measurement can be used
for attestation purposes.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/kvm/svm.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 52 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 91b070f..9b672eb 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5957,6 +5957,54 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
}

+static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+ struct sev_data_launch_measure *data = NULL;
+ struct kvm_sev_launch_measure params;
+ void *addr = NULL;
+ int ret;
+
+ if (!sev_guest(kvm))
+ return -ENOTTY;
+
+ if (copy_from_user(&params, (void *)argp->data,
+ sizeof(struct kvm_sev_launch_measure)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (params.address && params.length) {
+ ret = -EFAULT;
+ addr = kzalloc(params.length, GFP_KERNEL);
+ if (!addr)
+ goto e_free;
+ data->address = __psp_pa(addr);
+ data->length = params.length;
+ }
+
+ data->handle = sev_get_handle(kvm);
+ ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error);
+
+ /* copy the measurement to userspace */
+ if (addr &&
+ copy_to_user((void *)params.address, addr, params.length)) {
+ ret = -EFAULT;
+ goto e_free;
+ }
+
+ params.length = data->length;
+ if (copy_to_user((void *)argp->data, &params,
+ sizeof(struct kvm_sev_launch_measure)))
+ ret = -EFAULT;
+
+e_free:
+ kfree(addr);
+ kfree(data);
+ return ret;
+}
+
static int svm_memory_encryption_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@@ -5980,6 +6028,10 @@ static int svm_memory_encryption_op(struct kvm *kvm, void __user *argp)
r = sev_launch_update_data(kvm, &sev_cmd);
break;
}
+ case KVM_SEV_LAUNCH_MEASURE: {
+ r = sev_launch_measure(kvm, &sev_cmd);
+ break;
+ }
default:
break;
}
--
2.9.4
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