[libvirt] [PATCH 24/34] Convert disk drive over to use -device where available
Daniel Veillard
veillard at redhat.com
Fri Jan 15 17:07:28 UTC 2010
On Fri, Jan 08, 2010 at 05:23:20PM +0000, Daniel P. Berrange wrote:
> The current preferred syntax for disk drives uses
>
> -drive file=/vms/plain.qcow,if=virtio,index=0,boot=on,format=qcow
>
> The new syntax splits this up into a pair of linked args
>
> -drive file=/vms/plain.qcow,if=none,id=drive-virtio-0,format=qcow2
> -device virtio-blk-pci,drive=drive-virtio-0,id=virtio-0,addr=<PCI SLOT>
>
> SCSI/IDE devices also get a bus property linking them to the
> controller
>
> -device scsi-disk,drive=drive-scsi0-0-0,id=scsi0-0-0,bus=scsi0.0,scsi-id=0
> -device ide-drive,drive=drive-ide0-0-0,id=ide0-0-0,bus=ide0,unit=0
> ---
> src/qemu/qemu_conf.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++---
> 1 files changed, 148 insertions(+), 9 deletions(-)
>
> diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
> index 067fe42..8b8455d 100644
> --- a/src/qemu/qemu_conf.c
> +++ b/src/qemu/qemu_conf.c
> @@ -1852,17 +1852,26 @@ qemuBuildDriveStr(virDomainDiskDefPtr disk,
> virBufferVSprintf(&opt, "file=%s,", disk->src);
> }
> }
> - virBufferVSprintf(&opt, "if=%s", bus);
> + if (qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE)
> + virBufferAddLit(&opt, "if=none");
> + else
> + virBufferVSprintf(&opt, "if=%s", bus);
> +
> if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
> virBufferAddLit(&opt, ",media=cdrom");
> - if (busid == -1 && unitid == -1) {
> - if (idx != -1)
> - virBufferVSprintf(&opt, ",index=%d", idx);
> +
> + if (qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) {
> + virBufferVSprintf(&opt, ",id=drive-%s", disk->info.alias);
> } else {
> - if (busid != -1)
> - virBufferVSprintf(&opt, ",bus=%d", busid);
> - if (unitid != -1)
> - virBufferVSprintf(&opt, ",unit=%d", unitid);
> + if (busid == -1 && unitid == -1) {
> + if (idx != -1)
> + virBufferVSprintf(&opt, ",index=%d", idx);
> + } else {
> + if (busid != -1)
> + virBufferVSprintf(&opt, ",bus=%d", busid);
> + if (unitid != -1)
> + virBufferVSprintf(&opt, ",unit=%d", unitid);
> + }
> }
> if (bootable &&
> disk->device == VIR_DOMAIN_DISK_DEVICE_DISK)
> @@ -1901,6 +1910,91 @@ error:
> return NULL;
> }
>
> +static int
> +qemuBuildDriveDevStr(virConnectPtr conn,
> + virDomainDiskDefPtr disk,
> + char **str)
> +{
> + virBuffer opt = VIR_BUFFER_INITIALIZER;
> + const char *bus = virDomainDiskQEMUBusTypeToString(disk->bus);
> + int idx = virDiskNameToIndex(disk->dst);
> +
> + if (idx < 0) {
> + qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
> + _("unsupported disk type '%s'"), disk->dst);
> + goto error;
> + }
> +
> + switch (disk->bus) {
> + case VIR_DOMAIN_DISK_BUS_IDE:
> + virBufferAddLit(&opt, "ide-drive");
> + virBufferVSprintf(&opt, ",bus=ide.%d,unit=%d",
> + disk->info.addr.drive.bus,
> + disk->info.addr.drive.unit);
> + break;
> + case VIR_DOMAIN_DISK_BUS_SCSI:
> + virBufferAddLit(&opt, "scsi-disk");
> + virBufferVSprintf(&opt, ",bus=scsi%d.%d,scsi-id=%d",
> + disk->info.addr.drive.controller,
> + disk->info.addr.drive.bus,
> + disk->info.addr.drive.unit);
> + break;
> + case VIR_DOMAIN_DISK_BUS_VIRTIO:
> + virBufferAddLit(&opt, "virtio-blk-pci");
> + qemuBuildDeviceAddressStr(&opt, &disk->info);
> + break;
> +
> + default:
> + qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
> + _("unsupported disk bus '%s' with device setup"), bus);
> + goto error;
> + }
> + virBufferVSprintf(&opt, ",drive=drive-%s", disk->info.alias);
> + virBufferVSprintf(&opt, ",id=%s", disk->info.alias);
> +
> + *str = virBufferContentAndReset(&opt);
> + return 0;
> +
> +error:
> + virBufferFreeAndReset(&opt);
> + *str = NULL;
> + return -1;
> +}
> +
> +
> +static char *
> +qemuBuildControllerDevStr(virDomainControllerDefPtr def)
> +{
> + virBuffer buf = VIR_BUFFER_INITIALIZER;
> +
> + switch (def->type) {
> + case VIR_DOMAIN_CONTROLLER_TYPE_SCSI:
> + virBufferAddLit(&buf, "lsi");
> + virBufferVSprintf(&buf, ",id=scsi%d", def->idx);
> + break;
> +
> + case VIR_DOMAIN_CONTROLLER_TYPE_IDE:
> + virBufferAddLit(&buf, "piix4-ide");
> + virBufferVSprintf(&buf, ",id=ide%d", def->idx);
> + break;
> +
> + default:
> + goto error;
> + }
> +
> + if (qemuBuildDeviceAddressStr(&buf, &def->info) < 0)
> + goto error;
> +
> + if (virBufferError(&buf))
> + goto error;
> +
> + return virBufferContentAndReset(&buf);
> +
> +error:
> + virBufferFreeAndReset(&buf);
> + return NULL;
> +}
> +
>
> int
> qemuBuildNicStr(virConnectPtr conn,
> @@ -2692,6 +2786,21 @@ int qemudBuildCommandLine(virConnectPtr conn,
> }
> }
>
> + if (qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) {
> + for (i = 0 ; i < def->ncontrollers ; i++) {
> + char *scsi;
> + if (def->controllers[i]->type != VIR_DOMAIN_CONTROLLER_TYPE_SCSI)
> + continue;
> +
> + ADD_ARG_LIT("-device");
> +
> + if (!(scsi = qemuBuildControllerDevStr(def->controllers[i])))
> + goto no_memory;
> +
> + ADD_ARG(scsi);
> + }
> + }
> +
> /* If QEMU supports -drive param instead of old -hda, -hdb, -cdrom .. */
> if (qemuCmdFlags & QEMUD_CMD_FLAG_DRIVE) {
> int bootCD = 0, bootFloppy = 0, bootDisk = 0;
> @@ -2717,6 +2826,7 @@ int qemudBuildCommandLine(virConnectPtr conn,
> char *optstr;
> int bootable = 0;
> virDomainDiskDefPtr disk = def->disks[i];
> + int withDeviceArg = 0;
>
> if (disk->bus == VIR_DOMAIN_DISK_BUS_USB) {
> if (disk->device == VIR_DOMAIN_DISK_DEVICE_DISK) {
> @@ -2746,9 +2856,38 @@ int qemudBuildCommandLine(virConnectPtr conn,
>
> ADD_ARG_LIT("-drive");
>
> - if (!(optstr = qemuBuildDriveStr(disk, bootable, qemuCmdFlags)))
> + /* Unfortunately it is nt possible to use
> + -device for floppys, or Xen paravirt
> + devices. Fortunately, those don't need
> + static PCI addresses, so we don't really
> + care that we can't use -device */
> + if ((qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) &&
> + (disk->bus != VIR_DOMAIN_DISK_BUS_XEN))
> + withDeviceArg = 1;
> + if (!(optstr = qemuBuildDriveStr(disk, bootable,
> + (withDeviceArg ? qemuCmdFlags :
> + (qemuCmdFlags & ~QEMUD_CMD_FLAG_DEVICE)))))
> goto error;
> ADD_ARG(optstr);
> +
> + if (withDeviceArg) {
> + if (disk->bus == VIR_DOMAIN_DISK_BUS_FDC) {
> + char *fdc;
> + ADD_ARG_LIT("-global");
> +
> + if (virAsprintf(&fdc, "isa-fdc,drive%c=drive-%s",
> + disk->info.addr.drive.unit ? 'B' : 'A',
> + disk->info.alias) < 0)
> + goto no_memory;
> + ADD_ARG(fdc);
> + } else {
> + ADD_ARG_LIT("-device");
> +
> + if (qemuBuildDriveDevStr(conn, disk, &optstr) < 0)
> + goto error;
> + ADD_ARG(optstr);
> + }
> + }
> }
> } else {
> for (i = 0 ; i < def->ndisks ; i++) {
The more I read those command line, the more I wonder when they
will invent their own structured definition format ...
ACK,
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel at veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
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