Commit 4cfdd47d authored by Brijesh Singh's avatar Brijesh Singh Committed by Paolo Bonzini

KVM: SVM: Add KVM_SEV SEND_START command

The command is used to create an outgoing SEV guest encryption context.

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: 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
Reviewed-by: default avatarSteve Rutherford <srutherford@google.com>
Reviewed-by: default avatarVenu Busireddy <venu.busireddy@oracle.com>
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Signed-off-by: default avatarAshish Kalra <ashish.kalra@amd.com>
Message-Id: <2f1686d0164e0f1b3d6a41d620408393e0a48376.1618498113.git.ashish.kalra@amd.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 52acd22f
......@@ -290,6 +290,36 @@ Returns: 0 on success, -negative on error
__u32 len;
};
11. KVM_SEV_SEND_START
----------------------
The KVM_SEV_SEND_START command can be used by the hypervisor to create an
outgoing guest encryption context.
If session_len is zero on entry, the length of the guest session information is
written to session_len and all other fields are not used.
Parameters (in): struct kvm_sev_send_start
Returns: 0 on success, -negative on error
::
struct kvm_sev_send_start {
__u32 policy; /* guest policy */
__u64 pdh_cert_uaddr; /* platform Diffie-Hellman certificate */
__u32 pdh_cert_len;
__u64 plat_certs_uaddr; /* platform certificate chain */
__u32 plat_certs_len;
__u64 amd_certs_uaddr; /* AMD certificate */
__u32 amd_certs_len;
__u64 session_uaddr; /* Guest session information */
__u32 session_len;
};
References
==========
......
......@@ -1111,6 +1111,131 @@ static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
}
/* Userspace wants to query session length. */
static int
__sev_send_start_query_session_length(struct kvm *kvm, struct kvm_sev_cmd *argp,
struct kvm_sev_send_start *params)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_send_start *data;
int ret;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (data == NULL)
return -ENOMEM;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, data, &argp->error);
if (ret < 0)
goto out;
params->session_len = data->session_len;
if (copy_to_user((void __user *)(uintptr_t)argp->data, params,
sizeof(struct kvm_sev_send_start)))
ret = -EFAULT;
out:
kfree(data);
return ret;
}
static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_send_start *data;
struct kvm_sev_send_start params;
void *amd_certs, *session_data;
void *pdh_cert, *plat_certs;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data,
sizeof(struct kvm_sev_send_start)))
return -EFAULT;
/* if session_len is zero, userspace wants to query the session length */
if (!params.session_len)
return __sev_send_start_query_session_length(kvm, argp,
&params);
/* some sanity checks */
if (!params.pdh_cert_uaddr || !params.pdh_cert_len ||
!params.session_uaddr || params.session_len > SEV_FW_BLOB_MAX_SIZE)
return -EINVAL;
/* allocate the memory to hold the session data blob */
session_data = kmalloc(params.session_len, GFP_KERNEL_ACCOUNT);
if (!session_data)
return -ENOMEM;
/* copy the certificate blobs from userspace */
pdh_cert = psp_copy_user_blob(params.pdh_cert_uaddr,
params.pdh_cert_len);
if (IS_ERR(pdh_cert)) {
ret = PTR_ERR(pdh_cert);
goto e_free_session;
}
plat_certs = psp_copy_user_blob(params.plat_certs_uaddr,
params.plat_certs_len);
if (IS_ERR(plat_certs)) {
ret = PTR_ERR(plat_certs);
goto e_free_pdh;
}
amd_certs = psp_copy_user_blob(params.amd_certs_uaddr,
params.amd_certs_len);
if (IS_ERR(amd_certs)) {
ret = PTR_ERR(amd_certs);
goto e_free_plat_cert;
}
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (data == NULL) {
ret = -ENOMEM;
goto e_free_amd_cert;
}
/* populate the FW SEND_START field with system physical address */
data->pdh_cert_address = __psp_pa(pdh_cert);
data->pdh_cert_len = params.pdh_cert_len;
data->plat_certs_address = __psp_pa(plat_certs);
data->plat_certs_len = params.plat_certs_len;
data->amd_certs_address = __psp_pa(amd_certs);
data->amd_certs_len = params.amd_certs_len;
data->session_address = __psp_pa(session_data);
data->session_len = params.session_len;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, data, &argp->error);
if (!ret && copy_to_user((void __user *)(uintptr_t)params.session_uaddr,
session_data, params.session_len)) {
ret = -EFAULT;
goto e_free;
}
params.policy = data->policy;
params.session_len = data->session_len;
if (copy_to_user((void __user *)(uintptr_t)argp->data, &params,
sizeof(struct kvm_sev_send_start)))
ret = -EFAULT;
e_free:
kfree(data);
e_free_amd_cert:
kfree(amd_certs);
e_free_plat_cert:
kfree(plat_certs);
e_free_pdh:
kfree(pdh_cert);
e_free_session:
kfree(session_data);
return ret;
}
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
......@@ -1173,6 +1298,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_GET_ATTESTATION_REPORT:
r = sev_get_attestation_report(kvm, &sev_cmd);
break;
case KVM_SEV_SEND_START:
r = sev_send_start(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;
......
......@@ -326,11 +326,11 @@ struct sev_data_send_start {
u64 pdh_cert_address; /* In */
u32 pdh_cert_len; /* In */
u32 reserved1;
u64 plat_cert_address; /* In */
u32 plat_cert_len; /* In */
u64 plat_certs_address; /* In */
u32 plat_certs_len; /* In */
u32 reserved2;
u64 amd_cert_address; /* In */
u32 amd_cert_len; /* In */
u64 amd_certs_address; /* In */
u32 amd_certs_len; /* In */
u32 reserved3;
u64 session_address; /* In */
u32 session_len; /* In/Out */
......
......@@ -1732,6 +1732,18 @@ struct kvm_sev_attestation_report {
__u32 len;
};
struct kvm_sev_send_start {
__u32 policy;
__u64 pdh_cert_uaddr;
__u32 pdh_cert_len;
__u64 plat_certs_uaddr;
__u32 plat_certs_len;
__u64 amd_certs_uaddr;
__u32 amd_certs_len;
__u64 session_uaddr;
__u32 session_len;
};
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
#define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)
......
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