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crypto: ccp: Add the SNP_SET_CONFIG command

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The SEV-SNP firmware provides the SNP_CONFIG command used to set various
system-wide configuration values for SNP guests, such as the reported
TCB version used when signing guest attestation reports. Add an
interface to set this via userspace.

  [ mdr: Squash in doc patch from Dionna, drop extended request/
    certificate handling and simplify this to a simple wrapper around
    SNP_CONFIG fw cmd. ]

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Co-developed-by: Alexey Kardashevskiy <aik@amd.com>
Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Co-developed-by: Dionna Glaze <dionnaglaze@google.com>
Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-26-michael.roth@amd.com
This commit is contained in:
Brijesh Singh 2024-01-25 22:11:25 -06:00 committed by Borislav Petkov (AMD)
parent fad133c79a
commit cb645fe478
3 changed files with 34 additions and 0 deletions
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13
Documentation/virt/coco/sev-guest.rst
View File

@ -162,6 +162,19 @@ SEV-SNP firmware SNP_COMMIT command. This prevents roll-back to a previously
committed firmware version. This will also update the reported TCB to match
that of the currently installed firmware.
2.6 SNP_SET_CONFIG
------------------
:Technology: sev-snp
:Type: hypervisor ioctl cmd
:Parameters (in): struct sev_user_data_snp_config
:Returns (out): 0 on success, -negative on error
SNP_SET_CONFIG is used to set the system-wide configuration such as
reported TCB version in the attestation report. The command is similar
to SNP_CONFIG command defined in the SEV-SNP spec. The current values of
the firmware parameters affected by this command can be queried via
SNP_PLATFORM_STATUS.
3. SEV-SNP CPUID Enforcement
============================

20
drivers/crypto/ccp/sev-dev.c
View File

@ -2004,6 +2004,23 @@ static int sev_ioctl_do_snp_commit(struct sev_issue_cmd *argp)
return __sev_do_cmd_locked(SEV_CMD_SNP_COMMIT, &buf, &argp->error);
}
static int sev_ioctl_do_snp_set_config(struct sev_issue_cmd *argp, bool writable)
{
struct sev_device *sev = psp_master->sev_data;
struct sev_user_data_snp_config config;
if (!sev->snp_initialized || !argp->data)
return -EINVAL;
if (!writable)
return -EPERM;
if (copy_from_user(&config, (void __user *)argp->data, sizeof(config)))
return -EFAULT;
return __sev_do_cmd_locked(SEV_CMD_SNP_CONFIG, &config, &argp->error);
}
static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
@ -2061,6 +2078,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
case SNP_COMMIT:
ret = sev_ioctl_do_snp_commit(&input);
break;
case SNP_SET_CONFIG:
ret = sev_ioctl_do_snp_set_config(&input, writable);
break;
default:
ret = -EINVAL;
goto out;

1
include/uapi/linux/psp-sev.h
View File

@ -30,6 +30,7 @@ enum {
SEV_GET_ID2,
SNP_PLATFORM_STATUS,
SNP_COMMIT,
SNP_SET_CONFIG,
SEV_MAX,
};