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path: root/drivers/crypto/ccp/sev-dev.c
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Diffstat (limited to 'drivers/crypto/ccp/sev-dev.c')
-rw-r--r--drivers/crypto/ccp/sev-dev.c127
1 files changed, 114 insertions, 13 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 9f5ccc1720cb..011ca31bdd72 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -233,6 +233,7 @@ static int sev_cmd_buffer_len(int cmd)
case SEV_CMD_SNP_GUEST_REQUEST: return sizeof(struct sev_data_snp_guest_request);
case SEV_CMD_SNP_CONFIG: return sizeof(struct sev_user_data_snp_config);
case SEV_CMD_SNP_COMMIT: return sizeof(struct sev_data_snp_commit);
+ case SEV_CMD_SNP_FEATURE_INFO: return sizeof(struct sev_data_snp_feature_info);
default: return 0;
}
@@ -1073,6 +1074,88 @@ static void snp_set_hsave_pa(void *arg)
wrmsrq(MSR_VM_HSAVE_PA, 0);
}
+bool sev_is_snp_ciphertext_hiding_supported(void)
+{
+ struct psp_device *psp = psp_master;
+ struct sev_device *sev;
+
+ if (!psp || !psp->sev_data)
+ return false;
+
+ sev = psp->sev_data;
+
+ /*
+ * Feature information indicates if CipherTextHiding feature is
+ * supported by the SEV firmware and additionally platform status
+ * indicates if CipherTextHiding feature is enabled in the
+ * Platform BIOS.
+ */
+ return ((sev->snp_feat_info_0.ecx & SNP_CIPHER_TEXT_HIDING_SUPPORTED) &&
+ sev->snp_plat_status.ciphertext_hiding_cap);
+}
+EXPORT_SYMBOL_GPL(sev_is_snp_ciphertext_hiding_supported);
+
+static int snp_get_platform_data(struct sev_device *sev, int *error)
+{
+ struct sev_data_snp_feature_info snp_feat_info;
+ struct snp_feature_info *feat_info;
+ struct sev_data_snp_addr buf;
+ struct page *page;
+ int rc;
+
+ /*
+ * This function is expected to be called before SNP is
+ * initialized.
+ */
+ if (sev->snp_initialized)
+ return -EINVAL;
+
+ buf.address = __psp_pa(&sev->snp_plat_status);
+ rc = sev_do_cmd(SEV_CMD_SNP_PLATFORM_STATUS, &buf, error);
+ if (rc) {
+ dev_err(sev->dev, "SNP PLATFORM_STATUS command failed, ret = %d, error = %#x\n",
+ rc, *error);
+ return rc;
+ }
+
+ sev->api_major = sev->snp_plat_status.api_major;
+ sev->api_minor = sev->snp_plat_status.api_minor;
+ sev->build = sev->snp_plat_status.build_id;
+
+ /*
+ * Do feature discovery of the currently loaded firmware,
+ * and cache feature information from CPUID 0x8000_0024,
+ * sub-function 0.
+ */
+ if (!sev->snp_plat_status.feature_info)
+ return 0;
+
+ /*
+ * Use dynamically allocated structure for the SNP_FEATURE_INFO
+ * command to ensure structure is 8-byte aligned, and does not
+ * cross a page boundary.
+ */
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ feat_info = page_address(page);
+ snp_feat_info.length = sizeof(snp_feat_info);
+ snp_feat_info.ecx_in = 0;
+ snp_feat_info.feature_info_paddr = __psp_pa(feat_info);
+
+ rc = sev_do_cmd(SEV_CMD_SNP_FEATURE_INFO, &snp_feat_info, error);
+ if (!rc)
+ sev->snp_feat_info_0 = *feat_info;
+ else
+ dev_err(sev->dev, "SNP FEATURE_INFO command failed, ret = %d, error = %#x\n",
+ rc, *error);
+
+ __free_page(page);
+
+ return rc;
+}
+
static int snp_filter_reserved_mem_regions(struct resource *rs, void *arg)
{
struct sev_data_range_list *range_list = arg;
@@ -1103,7 +1186,7 @@ static int snp_filter_reserved_mem_regions(struct resource *rs, void *arg)
return 0;
}
-static int __sev_snp_init_locked(int *error)
+static int __sev_snp_init_locked(int *error, unsigned int max_snp_asid)
{
struct psp_device *psp = psp_master;
struct sev_data_snp_init_ex data;
@@ -1164,6 +1247,12 @@ static int __sev_snp_init_locked(int *error)
}
memset(&data, 0, sizeof(data));
+
+ if (max_snp_asid) {
+ data.ciphertext_hiding_en = 1;
+ data.max_snp_asid = max_snp_asid;
+ }
+
data.init_rmp = 1;
data.list_paddr_en = 1;
data.list_paddr = __psp_pa(snp_range_list);
@@ -1286,7 +1375,7 @@ static int __sev_platform_init_locked(int *error)
sev = psp_master->sev_data;
- if (sev->state == SEV_STATE_INIT)
+ if (sev->sev_plat_status.state == SEV_STATE_INIT)
return 0;
__sev_platform_init_handle_tmr(sev);
@@ -1318,7 +1407,7 @@ static int __sev_platform_init_locked(int *error)
return rc;
}
- sev->state = SEV_STATE_INIT;
+ sev->sev_plat_status.state = SEV_STATE_INIT;
/* Prepare for first SEV guest launch after INIT */
wbinvd_on_all_cpus();
@@ -1347,10 +1436,10 @@ static int _sev_platform_init_locked(struct sev_platform_init_args *args)
sev = psp_master->sev_data;
- if (sev->state == SEV_STATE_INIT)
+ if (sev->sev_plat_status.state == SEV_STATE_INIT)
return 0;
- rc = __sev_snp_init_locked(&args->error);
+ rc = __sev_snp_init_locked(&args->error, args->max_snp_asid);
if (rc && rc != -ENODEV)
return rc;
@@ -1384,7 +1473,7 @@ static int __sev_platform_shutdown_locked(int *error)
sev = psp->sev_data;
- if (sev->state == SEV_STATE_UNINIT)
+ if (sev->sev_plat_status.state == SEV_STATE_UNINIT)
return 0;
ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
@@ -1394,7 +1483,7 @@ static int __sev_platform_shutdown_locked(int *error)
return ret;
}
- sev->state = SEV_STATE_UNINIT;
+ sev->sev_plat_status.state = SEV_STATE_UNINIT;
dev_dbg(sev->dev, "SEV firmware shutdown\n");
return ret;
@@ -1433,7 +1522,7 @@ static int snp_move_to_init_state(struct sev_issue_cmd *argp, bool *shutdown_req
{
int error, rc;
- rc = __sev_snp_init_locked(&error);
+ rc = __sev_snp_init_locked(&error, 0);
if (rc) {
argp->error = SEV_RET_INVALID_PLATFORM_STATE;
return rc;
@@ -1502,7 +1591,7 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool wr
if (!writable)
return -EPERM;
- if (sev->state == SEV_STATE_UNINIT) {
+ if (sev->sev_plat_status.state == SEV_STATE_UNINIT) {
rc = sev_move_to_init_state(argp, &shutdown_required);
if (rc)
return rc;
@@ -1551,7 +1640,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
data.len = input.length;
cmd:
- if (sev->state == SEV_STATE_UNINIT) {
+ if (sev->sev_plat_status.state == SEV_STATE_UNINIT) {
ret = sev_move_to_init_state(argp, &shutdown_required);
if (ret)
goto e_free_blob;
@@ -1599,6 +1688,16 @@ static int sev_get_api_version(void)
struct sev_user_data_status status;
int error = 0, ret;
+ /*
+ * Cache SNP platform status and SNP feature information
+ * if SNP is available.
+ */
+ if (cc_platform_has(CC_ATTR_HOST_SEV_SNP)) {
+ ret = snp_get_platform_data(sev, &error);
+ if (ret)
+ return 1;
+ }
+
ret = sev_platform_status(&status, &error);
if (ret) {
dev_err(sev->dev,
@@ -1606,10 +1705,12 @@ static int sev_get_api_version(void)
return 1;
}
+ /* Cache SEV platform status */
+ sev->sev_plat_status = status;
+
sev->api_major = status.api_major;
sev->api_minor = status.api_minor;
sev->build = status.build;
- sev->state = status.state;
return 0;
}
@@ -1837,7 +1938,7 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
data.oca_cert_len = input.oca_cert_len;
/* If platform is not in INIT state then transition it to INIT */
- if (sev->state != SEV_STATE_INIT) {
+ if (sev->sev_plat_status.state != SEV_STATE_INIT) {
ret = sev_move_to_init_state(argp, &shutdown_required);
if (ret)
goto e_free_oca;
@@ -2008,7 +2109,7 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
cmd:
/* If platform is not in INIT state then transition it to INIT. */
- if (sev->state != SEV_STATE_INIT) {
+ if (sev->sev_plat_status.state != SEV_STATE_INIT) {
if (!writable) {
ret = -EPERM;
goto e_free_cert;
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-11 06:12:49 +0000