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[v3,06/20] target/i386: sev: Use ram_block_discard_disable()

Message ID 20200603144914.41645-7-david@redhat.com
State New
Headers show
Series None | expand

Commit Message

David Hildenbrand June 3, 2020, 2:49 p.m. UTC 
AMD SEV will pin all guest memory, mark discarding of RAM broken. At the
time this is called, we cannot have anyone active that relies on discards
to work properly - let's still implement error handling.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/i386/sev.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 51cdbe5496..4a4863db28 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -649,6 +649,12 @@  sev_guest_init(const char *id)
     uint32_t host_cbitpos;
     struct sev_user_data_status status = {};
 
+    ret = ram_block_discard_disable(true);
+    if (ret) {
+        error_report("%s: cannot disable RAM discard", __func__);
+        return NULL;
+    }
+
     sev_state = s = g_new0(SEVState, 1);
     s->sev_info = lookup_sev_guest_info(id);
     if (!s->sev_info) {
@@ -724,6 +730,7 @@  sev_guest_init(const char *id)
 err:
     g_free(sev_state);
     sev_state = NULL;
+    ram_block_discard_disable(false);
     return NULL;
 }