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[Qemu-devel] [PATCH 4/4] s390-ccw.img: Get queue config from host.
From: |
Cornelia Huck |
Subject: |
[Qemu-devel] [PATCH 4/4] s390-ccw.img: Get queue config from host. |
Date: |
Tue, 23 Apr 2013 14:37:14 +0200 |
Ask the host about the configuration instead of guessing it.
Signed-off-by: Cornelia Huck <address@hidden>
---
pc-bios/s390-ccw/virtio.c | 10 +++++++---
pc-bios/s390-ccw/virtio.h | 5 +++++
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 8e37dce..6b28aab 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -261,17 +261,21 @@ int virtio_read(ulong sector, void *load_addr)
void virtio_setup_block(struct subchannel_id schid)
{
struct vq_info_block info;
+ struct vq_config_block config = {};
virtio_reset(schid);
- /* XXX need to fetch the 128 from host */
- vring_init(&block, 128, (void*)(100 * 1024 * 1024),
+ config.index = 0;
+ if (run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config))) {
+ virtio_panic("Could not get block device configuration\n");
+ }
+ vring_init(&block, config.num, (void*)(100 * 1024 * 1024),
KVM_S390_VIRTIO_RING_ALIGN);
info.queue = (100ULL * 1024ULL* 1024ULL);
info.align = KVM_S390_VIRTIO_RING_ALIGN;
info.index = 0;
- info.num = 128;
+ info.num = config.num;
block.schid = schid;
if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) {
diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
index a33199d..86fdd57 100644
--- a/pc-bios/s390-ccw/virtio.h
+++ b/pc-bios/s390-ccw/virtio.h
@@ -53,6 +53,11 @@ struct vq_info_block {
u16 num;
} __attribute__((packed));
+struct vq_config_block {
+ u16 index;
+ u16 num;
+} __attribute__((packed));
+
struct virtio_dev {
struct virtio_dev_header *header;
struct virtio_vqconfig *vqconfig;
--
1.7.12.4