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5c6c3a6c54
Now that do have a nicer interface to work against we can add Linux native AIO support. It's an extremly thing layer just setting up an iocb for the io_submit system call in the submission path, and registering an eventfd with the qemu poll handler to do complete the iocbs directly from there. This started out based on Anthony's earlier AIO patch, but after estimated 42,000 rewrites and just as many build system changes there's not much left of it. To enable native kernel aio use the aio=native sub-command on the drive command line. I have also added an option to qemu-io to test the aio support without needing a guest. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qemu-config.h"
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QemuOptsList qemu_drive_opts = {
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.name = "drive",
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.head = TAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
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.desc = {
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{
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.name = "bus",
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.type = QEMU_OPT_NUMBER,
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.help = "bus number",
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},{
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.name = "unit",
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.type = QEMU_OPT_NUMBER,
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.help = "unit number (i.e. lun for scsi)",
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},{
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.name = "if",
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.type = QEMU_OPT_STRING,
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.help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
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},{
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.name = "index",
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.type = QEMU_OPT_NUMBER,
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},{
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.name = "cyls",
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.type = QEMU_OPT_NUMBER,
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.help = "number of cylinders (ide disk geometry)",
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},{
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.name = "heads",
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.type = QEMU_OPT_NUMBER,
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.help = "number of heads (ide disk geometry)",
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},{
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.name = "secs",
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.type = QEMU_OPT_NUMBER,
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.help = "number of sectors (ide disk geometry)",
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},{
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.name = "trans",
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.type = QEMU_OPT_STRING,
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.help = "chs translation (auto, lba. none)",
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},{
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.name = "media",
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.type = QEMU_OPT_STRING,
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.help = "media type (disk, cdrom)",
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},{
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.name = "snapshot",
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.type = QEMU_OPT_BOOL,
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},{
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.name = "file",
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.type = QEMU_OPT_STRING,
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.help = "disk image",
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},{
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.name = "cache",
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.type = QEMU_OPT_STRING,
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.help = "host cache usage (none, writeback, writethrough)",
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},{
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.name = "aio",
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.type = QEMU_OPT_STRING,
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.help = "host AIO implementation (threads, native)",
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},{
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.name = "format",
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.type = QEMU_OPT_STRING,
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.help = "disk format (raw, qcow2, ...)",
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},{
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.name = "serial",
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.type = QEMU_OPT_STRING,
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},{
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.name = "werror",
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.type = QEMU_OPT_STRING,
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},{
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.name = "addr",
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.type = QEMU_OPT_STRING,
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.help = "pci address (virtio only)",
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},
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{ /* end if list */ }
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},
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};
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QemuOptsList qemu_device_opts = {
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.name = "device",
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.head = TAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
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.desc = {
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/*
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* no elements => accept any
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* sanity checking will happen later
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* when setting device properties
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*/
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{ /* end if list */ }
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},
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};
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static QemuOptsList *lists[] = {
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&qemu_drive_opts,
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&qemu_device_opts,
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NULL,
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};
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int qemu_set_option(const char *str)
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{
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char group[64], id[64], arg[64];
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QemuOpts *opts;
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int i, rc, offset;
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rc = sscanf(str, "%63[^.].%63[^.].%63[^=]%n", group, id, arg, &offset);
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if (rc < 3 || str[offset] != '=') {
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fprintf(stderr, "can't parse: \"%s\"\n", str);
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return -1;
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}
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for (i = 0; lists[i] != NULL; i++) {
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if (strcmp(lists[i]->name, group) == 0)
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break;
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}
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if (lists[i] == NULL) {
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fprintf(stderr, "there is no option group \"%s\"\n", group);
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return -1;
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}
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opts = qemu_opts_find(lists[i], id);
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if (!opts) {
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fprintf(stderr, "there is no %s \"%s\" defined\n",
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lists[i]->name, id);
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return -1;
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}
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if (-1 == qemu_opt_set(opts, arg, str+offset+1)) {
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fprintf(stderr, "failed to set \"%s\" for %s \"%s\"\n",
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arg, lists[i]->name, id);
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return -1;
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}
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return 0;
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}
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