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[PULL,6/6] target/i386/sev: Replace qemu_map_ram_ptr with address_space_map

Message ID 20211118133532.2029166-7-berrange@redhat.com
State New
Headers show
Series [PULL,1/6] qapi/qom, target/i386: sev-guest: Introduce kernel-hashes=on|off option | expand

Commit Message

Daniel P. Berrangé Nov. 18, 2021, 1:35 p.m. UTC 
From: Dov Murik <dovmurik@linux.ibm.com>

Use address_space_map/unmap and check for errors.

Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
Acked-by: Brijesh Singh <brijesh.singh@amd.com>
[Two lines wrapped for length - Daniel]
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 target/i386/sev.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
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Patch

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 4fd258a570..025ff7a6f8 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -37,6 +37,7 @@ 
 #include "qapi/qmp/qerror.h"
 #include "exec/confidential-guest-support.h"
 #include "hw/i386/pc.h"
+#include "exec/address-spaces.h"
 
 #define TYPE_SEV_GUEST "sev-guest"
 OBJECT_DECLARE_SIMPLE_TYPE(SevGuestState, SEV_GUEST)
@@ -1232,6 +1233,9 @@  bool sev_add_kernel_loader_hashes(SevKernelLoaderContext *ctx, Error **errp)
     uint8_t kernel_hash[HASH_SIZE];
     uint8_t *hashp;
     size_t hash_len = HASH_SIZE;
+    hwaddr mapped_len = sizeof(*padded_ht);
+    MemTxAttrs attrs = { 0 };
+    bool ret = true;
 
     /*
      * Only add the kernel hashes if the sev-guest configuration explicitly
@@ -1292,7 +1296,12 @@  bool sev_add_kernel_loader_hashes(SevKernelLoaderContext *ctx, Error **errp)
      * Populate the hashes table in the guest's memory at the OVMF-designated
      * area for the SEV hashes table
      */
-    padded_ht = qemu_map_ram_ptr(NULL, area->base);
+    padded_ht = address_space_map(&address_space_memory, area->base,
+                                  &mapped_len, true, attrs);
+    if (!padded_ht || mapped_len != sizeof(*padded_ht)) {
+        error_setg(errp, "SEV: cannot map hashes table guest memory area");
+        return false;
+    }
     ht = &padded_ht->ht;
 
     ht->guid = sev_hash_table_header_guid;
@@ -1314,10 +1323,13 @@  bool sev_add_kernel_loader_hashes(SevKernelLoaderContext *ctx, Error **errp)
     memset(padded_ht->padding, 0, sizeof(padded_ht->padding));
 
     if (sev_encrypt_flash((uint8_t *)padded_ht, sizeof(*padded_ht), errp) < 0) {
-        return false;
+        ret = false;
     }
 
-    return true;
+    address_space_unmap(&address_space_memory, padded_ht,
+                        mapped_len, true, mapped_len);
+
+    return ret;
 }
 
 static void