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[Qemu-devel] [PATCH 06/11] virtio-blk: disable write cache if not negoti
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 06/11] virtio-blk: disable write cache if not negotiated |
Date: |
Fri, 10 Aug 2012 18:47:24 +0200 |
From: Paolo Bonzini <address@hidden>
If the guest does not support flushes, we should run in writethrough mode.
The setting is temporary until the next reset, so that for example the
BIOS will run in writethrough mode while Linux will run with a writeback
cache.
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
hw/virtio-blk.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index 97bb4bd..fd8fa90 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -543,6 +543,19 @@ static uint32_t virtio_blk_get_features(VirtIODevice
*vdev, uint32_t features)
return features;
}
+static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
+{
+ VirtIOBlock *s = to_virtio_blk(vdev);
+ uint32_t features;
+
+ if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return;
+ }
+
+ features = vdev->guest_features;
+ bdrv_set_enable_write_cache(s->bs, !!(features & (1 << VIRTIO_BLK_F_WCE)));
+}
+
static void virtio_blk_save(QEMUFile *f, void *opaque)
{
VirtIOBlock *s = opaque;
@@ -623,6 +636,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev,
VirtIOBlkConf *blk)
s->vdev.get_config = virtio_blk_update_config;
s->vdev.set_config = virtio_blk_set_config;
s->vdev.get_features = virtio_blk_get_features;
+ s->vdev.set_status = virtio_blk_set_status;
s->vdev.reset = virtio_blk_reset;
s->bs = blk->conf.bs;
s->conf = &blk->conf;
--
1.7.6.5
- [Qemu-devel] [PULL 00/11] Block patches, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 01/11] virtio-blk: fix use-after-free while handling scsi commands, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 02/11] ahci: Fix ahci cdrom read corruptions for reads > 128k, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 03/11] ahci: Fix sglist memleak in ahci_dma_rw_buf(), Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 05/11] virtio-blk: support VIRTIO_BLK_F_CONFIG_WCE, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 04/11] qemu-iotests: Save some sed processes, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 06/11] virtio-blk: disable write cache if not negotiated,
Kevin Wolf <=
- [Qemu-devel] [PATCH 09/11] qcow2: mark image clean after repair succeeds, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 07/11] blockdev: flip default cache mode from writethrough to writeback, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 08/11] qed: mark image clean after repair succeeds, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 11/11] qemu-iotests: skip 039 with ./check -nocache, Kevin Wolf, 2012/08/10
- [Qemu-devel] [PATCH 10/11] block: add BLOCK_O_CHECK for qemu-img check, Kevin Wolf, 2012/08/10
- Re: [Qemu-devel] [PULL 00/11] Block patches, Anthony Liguori, 2012/08/12