@@ -2053,6 +2053,38 @@ int sev_guest_df_flush(int *error)
}
EXPORT_SYMBOL_GPL(sev_guest_df_flush);
+int snp_guest_dbg_decrypt_page(u64 gctx_pfn, u64 src_pfn, u64 dst_pfn, int *error)
+{
+ struct sev_data_snp_dbg data = {0};
+ struct sev_device *sev;
+ int ret;
+
+ if (!psp_master || !psp_master->sev_data)
+ return -ENODEV;
+
+ sev = psp_master->sev_data;
+
+ if (!sev->snp_initialized)
+ return -EINVAL;
+
+ data.gctx_paddr = sme_me_mask | (gctx_pfn << PAGE_SHIFT);
+ data.src_addr = sme_me_mask | (src_pfn << PAGE_SHIFT);
+ data.dst_addr = sme_me_mask | (dst_pfn << PAGE_SHIFT);
+
+ /* The destination page must be in the firmware state. */
+ if (rmp_mark_pages_firmware(data.dst_addr, 1, false))
+ return -EIO;
+
+ ret = sev_do_cmd(SEV_CMD_SNP_DBG_DECRYPT, &data, error);
+
+ /* Restore the page state */
+ if (snp_reclaim_pages(data.dst_addr, 1, false))
+ ret = -EIO;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snp_guest_dbg_decrypt_page);
+
static void sev_exit(struct kref *ref)
{
misc_deregister(&misc_dev->misc);
@@ -930,6 +930,20 @@ int sev_guest_decommission(struct sev_data_decommission *data, int *error);
*/
int sev_do_cmd(int cmd, void *data, int *psp_ret);
+/**
+ * snp_guest_dbg_decrypt_page - perform SEV SNP_DBG_DECRYPT command
+ *
+ * @sev_ret: sev command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV if the SEV device is not available
+ * -%ENOTSUPP if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO if the SEV returned a non-zero return code
+ */
+int snp_guest_dbg_decrypt_page(u64 gctx_pfn, u64 src_pfn, u64 dst_pfn, int *error);
+
void *psp_copy_user_blob(u64 uaddr, u32 len);
void *snp_alloc_firmware_page(gfp_t mask);
void snp_free_firmware_page(void *addr);
@@ -960,6 +974,11 @@ sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int
static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); }
+static inline int snp_guest_dbg_decrypt_page(u64 gctx_pfn, u64 src_pfn, u64 dst_pfn, int *error)
+{
+ return -ENODEV;
+}
+
static inline void *snp_alloc_firmware_page(gfp_t mask)
{
return NULL;