From 1f5f49056d0f140568805d66f33396ed5cd90369 Mon Sep 17 00:00:00 2001 From: Juraj Marcin Date: Wed, 4 Sep 2024 12:37:15 +0200 Subject: virtio-mem: Add support for suspend+wake-up with plugged memory Before, the virtio-mem device would unplug all the memory with any reset of the device, including during the wake-up of the guest from a suspended state. Due to this, the virtio-mem driver in the Linux kernel disallowed suspend-to-ram requests in the guest when the VIRTIO_MEM_F_PERSISTENT_SUSPEND feature is not exposed by QEMU. This patch adds the code to skip the reset on wake-up and exposes theVIRTIO_MEM_F_PERSISTENT_SUSPEND feature to the guest kernel driver when suspending is possible in QEMU (currently only x86). Message-ID: <20240904103722.946194-5-jmarcin@redhat.com> Reviewed-by: David Hildenbrand Signed-off-by: Juraj Marcin Signed-off-by: David Hildenbrand --- hw/virtio/virtio-qmp.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'hw/virtio/virtio-qmp.c') diff --git a/hw/virtio/virtio-qmp.c b/hw/virtio/virtio-qmp.c index 1dd96ed20f..cccc6fe761 100644 --- a/hw/virtio/virtio-qmp.c +++ b/hw/virtio/virtio-qmp.c @@ -450,6 +450,9 @@ static const qmp_virtio_feature_map_t virtio_mem_feature_map[] = { FEATURE_ENTRY(VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE, \ "VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE: Unplugged memory cannot be " "accessed"), + FEATURE_ENTRY(VIRTIO_MEM_F_PERSISTENT_SUSPEND, \ + "VIRTIO_MEM_F_PERSISTENT_SUSPND: Plugged memory will remain " + "plugged when suspending+resuming"), { -1, "" } }; #endif -- cgit 1.4.1