[PATCH 2/4] qemu: Implement the aio mode io_uring

This aio mode was added since Linux 5.1[1], QEMU 5.0.0[2], which will deliever faster and more efficient I/O operations for the file, host_device, host_cdrom backends. Reference: [1]: https://lwn.net/Articles/810414/ [2]: https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg07686.html Signed-off-by: Han Han <hhan(a)redhat.com&gt; --- src/conf/domain_conf.c | 1 + src/conf/domain_conf.h | 1 + src/qemu/qemu_command.c | 8 ++++++++ 3 files changed, 10 insertions(+) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 8700d567..bcaed3ef 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -361,6 +361,7 @@ VIR_ENUM_IMPL(virDomainDiskIo, "default", "native", "threads", + "io_uring", ); VIR_ENUM_IMPL(virDomainDeviceSGIO, diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index aad3f82d..9f36d3d9 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -421,6 +421,7 @@ typedef enum { VIR_DOMAIN_DISK_IO_DEFAULT = 0, VIR_DOMAIN_DISK_IO_NATIVE, VIR_DOMAIN_DISK_IO_THREADS, + VIR_DOMAIN_DISK_IO_URING, VIR_DOMAIN_DISK_IO_LAST } virDomainDiskIo; diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 95402fc4..45dd8307 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -1435,6 +1435,14 @@ qemuCheckDiskConfig(virDomainDiskDefPtr disk, _("detect_zeroes is not supported by this QEMU binary")); return -1; } + + if (disk->iomode == VIR_DOMAIN_DISK_IO_URING) { + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_AIO_IO_URING)) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("io uring is not supported by this QEMU binary")); + return -1; + } + } } if (disk->serial && -- 2.25.0