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machine/memory encryption: Disable mem merge

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When a host is running with memory encryption, the memory isn't visible
to the host kernel; attempts to merge that memory are futile because
what it's really comparing is encrypted memory, usually encrypted
with different keys.

Automatically turn mem-merge off when memory encryption is specified.

https://bugzilla.redhat.com/show_bug.cgi?id=1796356

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20200130175046.85850-1-dgilbert@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2020-01-30 17:50:46 +00:00 committed by Eduardo Habkost
parent dcf08bc60b
commit 4ba59be1d6
1 changed files with 8 additions and 0 deletions
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8
hw/core/machine.c
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@ -425,6 +425,14 @@ static void machine_set_memory_encryption(Object *obj, const char *value,
g_free(ms->memory_encryption); g_free(ms->memory_encryption);
ms->memory_encryption = g_strdup(value); ms->memory_encryption = g_strdup(value);
/*
* With memory encryption, the host can't see the real contents of RAM,
* so there's no point in it trying to merge areas.
*/
if (value) {
machine_set_mem_merge(obj, false, errp);
}
} }
static bool machine_get_nvdimm(Object *obj, Error **errp) static bool machine_get_nvdimm(Object *obj, Error **errp)