[libvirt] [PATCHv2 1/2] qemu: add capabilities flags related to SG_IO

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