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[Qemu-block] [PATCH v6 05/10] virtio-blk: set config size depending on t
From: |
Stefano Garzarella |
Subject: |
[Qemu-block] [PATCH v6 05/10] virtio-blk: set config size depending on the features enabled |
Date: |
Thu, 21 Feb 2019 11:33:09 +0100 |
Starting from DISABLE and WRITE_ZEROES features, we use an array of
VirtIOFeature (as virtio-net) to properly set the config size
depending on the features enabled.
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Stefano Garzarella <address@hidden>
---
hw/block/virtio-blk.c | 31 +++++++++++++++++++++++++------
include/hw/virtio/virtio-blk.h | 1 +
2 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index f7cd322811..8798d13bc4 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -28,9 +28,28 @@
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
-/* We don't support discard yet, hide associated config fields. */
+/* Config size before the discard support (hide associated config fields) */
#define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
max_discard_sectors)
+/*
+ * Starting from the discard feature, we can use this array to properly
+ * set the config size depending on the features enabled.
+ */
+static VirtIOFeature feature_sizes[] = {
+ {.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
+ .end = virtio_endof(struct virtio_blk_config, discard_sector_alignment)},
+ {.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
+ .end = virtio_endof(struct virtio_blk_config, write_zeroes_may_unmap)},
+ {}
+};
+
+static void virtio_blk_set_config_size(VirtIOBlock *s, uint64_t host_features)
+{
+ s->config_size = MAX(VIRTIO_BLK_CFG_SIZE,
+ virtio_feature_get_config_size(feature_sizes, host_features));
+
+ assert(s->config_size <= sizeof(struct virtio_blk_config));
+}
static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
VirtIOBlockReq *req)
@@ -763,8 +782,7 @@ static void virtio_blk_update_config(VirtIODevice *vdev,
uint8_t *config)
blkcfg.alignment_offset = 0;
blkcfg.wce = blk_enable_write_cache(s->blk);
virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
- memcpy(config, &blkcfg, VIRTIO_BLK_CFG_SIZE);
- QEMU_BUILD_BUG_ON(VIRTIO_BLK_CFG_SIZE > sizeof(blkcfg));
+ memcpy(config, &blkcfg, s->config_size);
}
static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
@@ -772,8 +790,7 @@ static void virtio_blk_set_config(VirtIODevice *vdev, const
uint8_t *config)
VirtIOBlock *s = VIRTIO_BLK(vdev);
struct virtio_blk_config blkcfg;
- memcpy(&blkcfg, config, VIRTIO_BLK_CFG_SIZE);
- QEMU_BUILD_BUG_ON(VIRTIO_BLK_CFG_SIZE > sizeof(blkcfg));
+ memcpy(&blkcfg, config, s->config_size);
aio_context_acquire(blk_get_aio_context(s->blk));
blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
@@ -956,7 +973,9 @@ static void virtio_blk_device_realize(DeviceState *dev,
Error **errp)
return;
}
- virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, VIRTIO_BLK_CFG_SIZE);
+ virtio_blk_set_config_size(s, s->host_features);
+
+ virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, s->config_size);
s->blk = conf->conf.blk;
s->rq = NULL;
diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h
index f7345b0511..7877ae67ae 100644
--- a/include/hw/virtio/virtio-blk.h
+++ b/include/hw/virtio/virtio-blk.h
@@ -56,6 +56,7 @@ typedef struct VirtIOBlock {
bool dataplane_started;
struct VirtIOBlockDataPlane *dataplane;
uint64_t host_features;
+ size_t config_size;
} VirtIOBlock;
typedef struct VirtIOBlockReq {
--
2.20.1
- [Qemu-block] [PATCH v6 00/10] virtio-blk: add DISCARD and WRITE_ZEROES features, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 02/10] virtio-blk: add host_features field in VirtIOBlock, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 01/10] virtio-blk: add acct_failed param to virtio_blk_handle_rw_error(), Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 03/10] virtio-blk: add "discard" and "write-zeroes" properties, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 04/10] virtio-net: make VirtIOFeature usable for other virtio devices, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 07/10] tests/virtio-blk: change assert on data_size in virtio_blk_request(), Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 06/10] virtio-blk: add DISCARD and WRITE_ZEROES features, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 09/10] tests/virtio-blk: add test for WRITE_ZEROES command, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 08/10] tests/virtio-blk: add virtio_blk_fix_dwz_hdr() function, Stefano Garzarella, 2019/02/21
- [Qemu-block] [PATCH v6 05/10] virtio-blk: set config size depending on the features enabled,
Stefano Garzarella <=
- [Qemu-block] [PATCH v6 10/10] tests/virtio-blk: add test for DISCARD command, Stefano Garzarella, 2019/02/21
- Re: [Qemu-block] [PATCH v6 00/10] virtio-blk: add DISCARD and WRITE_ZEROES features, Stefan Hajnoczi, 2019/02/22