@@ -20,6 +20,7 @@
#include <linux/hw_random.h>
#include <linux/ccp.h>
#include <linux/firmware.h>
+#include <linux/gfp.h>
#include <asm/smp.h>
@@ -44,6 +45,17 @@ MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during
static bool psp_dead;
static int psp_timeout;
+/* Trusted Memory Region (TMR):
+ * The TMR is a 1MB area that must be 1MB aligned. To achieve this, allocate
+ * an amount that is the size of area plus an amount equal to the required
+ * alignment. The aligned address will be calculated from the returned
+ * address.
+ */
+#define SEV_ES_TMR_ALIGN (1024 * 1024)
+#define SEV_ES_TMR_SIZE (1024 * 1024)
+#define SEV_ES_TMR_LEN (SEV_ES_TMR_ALIGN + SEV_ES_TMR_SIZE)
+static void *sev_es_tmr;
+
static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
{
struct sev_device *sev = psp_master->sev_data;
@@ -214,6 +226,21 @@ static int __sev_platform_init_locked(int *error)
if (sev->state == SEV_STATE_INIT)
return 0;
+ if (sev_es_tmr) {
+ u64 tmr_pa;
+
+ /*
+ * Do not include the encryption mask on the physical
+ * address of the TMR (firmware should clear it anyway).
+ */
+ tmr_pa = __pa(sev_es_tmr);
+ tmr_pa = ALIGN(tmr_pa, SEV_ES_TMR_ALIGN);
+
+ sev->init_cmd_buf.flags |= SEV_INIT_FLAGS_SEV_ES;
+ sev->init_cmd_buf.tmr_address = tmr_pa;
+ sev->init_cmd_buf.tmr_len = SEV_ES_TMR_SIZE;
+ }
+
rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error);
if (rc)
return rc;
@@ -1012,6 +1039,7 @@ EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
void sev_pci_init(void)
{
struct sev_device *sev = psp_master->sev_data;
+ struct page *tmr_page;
int error, rc;
if (!sev)
@@ -1041,6 +1069,16 @@ void sev_pci_init(void)
sev_update_firmware(sev->dev) == 0)
sev_get_api_version();
+ /* Obtain the TMR memory area for SEV-ES use */
+ tmr_page = alloc_pages(GFP_KERNEL, get_order(SEV_ES_TMR_LEN));
+ if (tmr_page) {
+ sev_es_tmr = page_address(tmr_page);
+ } else {
+ sev_es_tmr = NULL;
+ dev_warn(sev->dev,
+ "SEV: TMR allocation failed, SEV-ES support unavailable\n");
+ }
+
/* Initialize the platform */
rc = sev_platform_init(&error);
if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
@@ -1075,4 +1113,13 @@ void sev_pci_exit(void)
return;
sev_platform_shutdown(NULL);
+
+ if (sev_es_tmr) {
+ /* The TMR area was encrypted, flush it from the cache */
+ wbinvd_on_all_cpus();
+
+ free_pages((unsigned long)sev_es_tmr,
+ get_order(SEV_ES_TMR_LEN));
+ sev_es_tmr = NULL;
+ }
}
@@ -100,6 +100,8 @@ struct sev_data_init {
u32 tmr_len; /* In */
} __packed;
+#define SEV_INIT_FLAGS_SEV_ES 0x01
+
/**
* struct sev_data_pek_csr - PEK_CSR command parameters
*
@@ -83,6 +83,8 @@ struct sev_user_data_status {
__u32 guest_count; /* Out */
} __packed;
+#define SEV_STATUS_FLAGS_CONFIG_ES 0x0100
+
/**
* struct sev_user_data_pek_csr - PEK_CSR command parameters
*
To provide support for SEV-ES, the hypervisor must provide an area of memory to the PSP. Once this Trusted Memory Region (TMR) is provided to the PSP, the contents of this area of memory are no longer available to the x86. Update the PSP driver to allocate a 1MB region for the TMR that is 1MB aligned and then provide it to the PSP through the SEV INIT command. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- drivers/crypto/ccp/sev-dev.c | 47 ++++++++++++++++++++++++++++++++++++ include/linux/psp-sev.h | 2 ++ include/uapi/linux/psp-sev.h | 2 ++ 3 files changed, 51 insertions(+)