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target/i386: sev: Use ram_block_discard_disable()

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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>
Message-Id: <20200626072248.78761-8-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand 2020-06-26 09:22:34 +02:00 • committed by Michael S. Tsirkin
parent 06df2e692a
commit fee3f3baff
1 changed files with 7 additions and 0 deletions
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7
target/i386/sev.c
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@ -680,6 +680,12 @@ sev_guest_init(const char *id)
uint32_t host_cbitpos; uint32_t host_cbitpos;
struct sev_user_data_status status = {}; 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 = lookup_sev_guest_info(id); sev = lookup_sev_guest_info(id);
if (!sev) { if (!sev) {
error_report("%s: '%s' is not a valid '%s' object", error_report("%s: '%s' is not a valid '%s' object",
@ -751,6 +757,7 @@ sev_guest_init(const char *id)
return sev; return sev;
err: err:
sev_guest = NULL; sev_guest = NULL;
ram_block_discard_disable(false);
return NULL; return NULL;
} }