This patch adds two capabilities flags to deal with various aspects
of supporting SG_IO commands on virtio-blk-pci devices:
QEMU_CAPS_VIRTIO_BLK_SCSI
set if -device virtio-blk-pci accepts the scsi="on|off" option
When present, this is on by default, but can be set to off to disable
SG_IO functions.
QEMU_CAPS_VIRTIO_BLK_SG_IO
set if SG_IO commands are supported in the virtio-blk-pci driver
(present since qemu 0.11 according to a qemu developer, if I
understood correctly)
---
src/qemu/qemu_capabilities.c | 8 ++++++++
src/qemu/qemu_capabilities.h | 3 +++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 43c7578..6842cfe 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -144,6 +144,9 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
"ich9-ahci",
"no-acpi",
"fsdev-readonly",
+
+ "virtio-blk-pci.scsi",
+ "blk-sg-io",
);
struct qemu_feature_flags {
@@ -1149,6 +1152,9 @@ qemuCapsComputeCmdFlags(const char *help,
if (version >= 10000)
qemuCapsSet(flags, QEMU_CAPS_0_10);
+ if (version >= 11000)
+ qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_SG_IO);
+
/* While JSON mode was available in 0.12.0, it was too
* incomplete to contemplate using. The 0.13.0 release
* is good enough to use, even though it lacks one or
@@ -1386,6 +1392,8 @@ qemuCapsParseDeviceStr(const char *str, virBitmapPtr flags)
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_EVENT_IDX);
if (strstr(str, "virtio-net-pci.event_idx"))
qemuCapsSet(flags, QEMU_CAPS_VIRTIO_NET_EVENT_IDX);
+ if (strstr(str, "virtio-blk-pci.scsi"))
+ qemuCapsSet(flags, QEMU_CAPS_VIRTIO_BLK_SCSI);
return 0;
}
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index c759baf..d47177c 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -118,6 +118,9 @@ enum qemuCapsFlags {
QEMU_CAPS_NO_ACPI = 78, /* -no-acpi */
QEMU_CAPS_FSDEV_READONLY =79, /* -fsdev readonly supported */
+ QEMU_CAPS_VIRTIO_BLK_SCSI = 80, /* virtio-blk-pci.scsi */
+ QEMU_CAPS_VIRTIO_BLK_SG_IO = 81, /* support for SG_IO commands, reportedly added in 0.11 */
+
QEMU_CAPS_LAST, /* this must always be the last item */
};
--
1.7.7.4
--
libvir-list mailing list
libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list