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authorDavid Hildenbrand <david@redhat.com>2020-11-16 11:59:47 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2020-11-16 13:22:17 -0500
commitb430b51395650137a80e78ee7395165b80fe1752 (patch)
tree4857d2981dcaf46f1685610f075eb3e06603d5d8 /stubs
parent2654ace151c07bd6519a7b71ab98d763137302eb (diff)
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util/vfio-helpers.c: Use ram_block_discard_disable() in qemu_vfio_open_pci()
Currently, when using "nvme://" for a block device, like -drive file=nvme://0000:01:00.0/1,if=none,id=drive0 \ -device virtio-blk,drive=drive0 \ VFIO may pin all guest memory, and discarding of RAM no longer works as expected. I was able to reproduce this easily with my 01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 Similar to common VFIO, we have to disable it, making sure that: a) virtio-balloon won't discard any memory ("silently disabled") b) virtio-mem and nvme:// run mutually exclusive Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20201116105947.9194-1-david@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'stubs')
-rw-r--r--stubs/ram-block.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/stubs/ram-block.c b/stubs/ram-block.c
index 73c0a3e..1081976 100644
--- a/stubs/ram-block.c
+++ b/stubs/ram-block.c
@@ -1,6 +1,7 @@
#include "qemu/osdep.h"
#include "exec/ramlist.h"
#include "exec/cpu-common.h"
+#include "exec/memory.h"
void *qemu_ram_get_host_addr(RAMBlock *rb)
{
@@ -29,3 +30,8 @@ int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque)
{
return 0;
}
+
+int ram_block_discard_disable(bool state)
+{
+ return 0;
+}