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KVM: SVM: Add support for KVM_SEV_LAUNCH_MEASURE command

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The command is used to retrieve the measurement of contents encrypted
through the KVM_SEV_LAUNCH_UPDATE_DATA command.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Brijesh Singh 2017-12-04 10:57:36 -06:00
parent 89c5058090
commit 0d0736f763
1 changed files with 74 additions and 0 deletions
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74
arch/x86/kvm/svm.c
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@ -6042,6 +6042,77 @@ e_free:
return ret;
}
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &kvm->arch.sev_info;
struct sev_data_launch_measure *data;
struct kvm_sev_launch_measure params;
void *blob = NULL;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
/* User wants to query the blob length */
if (!params.len)
goto cmd;
if (params.uaddr) {
if (params.len > SEV_FW_BLOB_MAX_SIZE) {
ret = -EINVAL;
goto e_free;
}
if (!access_ok(VERIFY_WRITE, params.uaddr, params.len)) {
ret = -EFAULT;
goto e_free;
}
ret = -ENOMEM;
blob = kmalloc(params.len, GFP_KERNEL);
if (!blob)
goto e_free;
data->address = __psp_pa(blob);
data->len = params.len;
}
cmd:
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error);
/*
* If we query the session length, FW responded with expected data.
*/
if (!params.len)
goto done;
if (ret)
goto e_free_blob;
if (blob) {
if (copy_to_user((void __user *)(uintptr_t)params.uaddr, blob, params.len))
ret = -EFAULT;
}
done:
params.len = data->len;
if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params)))
ret = -EFAULT;
e_free_blob:
kfree(blob);
e_free:
kfree(data);
return ret;
}
static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@ -6065,6 +6136,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_LAUNCH_UPDATE_DATA:
r = sev_launch_update_data(kvm, &sev_cmd);
break;
case KVM_SEV_LAUNCH_MEASURE:
r = sev_launch_measure(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;