Re: [PATCHv2 14/17] qemu: support new pci controller model "pcie-switch-upstream-port"

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On 07/17/2015 02:43 PM, Laine Stump wrote:
> this is backed by the qemu device x3130-upstream. It can only plug
> into a pcie-root-port or pcie-switch-downstream-port.
> ---
> 
> V2: change test case to reflect additional pcie-root-port between
> pcie-root and pcie-switch-upstream-port
> 
> src/qemu/qemu_command.c                            | 37 ++++++++++++++++++++++
>  .../qemuxml2argv-pcie-switch-upstream-port.args    | 12 +++++++
>  tests/qemuxml2argvtest.c                           |  9 ++++++
>  3 files changed, 58 insertions(+)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-upstream-port.args
> 
> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 725360c..30f54ce 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -1604,6 +1604,12 @@ qemuCollectPCIAddress(virDomainDefPtr def ATTRIBUTE_UNUSED,
>                   */
>                  flags = VIR_PCI_CONNECT_TYPE_PCIE_ROOT;
>                  break;
> +            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_UPSTREAM_PORT:
> +                /* pcie-switch can only connect to a true
> +                 * pcie bus, and can't be hot-plugged.
> +                 */
> +                flags = VIR_PCI_CONNECT_TYPE_PCIE_PORT;
> +                break;
>              default:
>                  break;
>              }
> @@ -2282,6 +2288,9 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
>                         options->port = (addr->slot << 3) + addr->function;
>                      break;
>                  case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_UPSTREAM_PORT:
> +                    if (!options->type)
> +                        deviceName = "x3130-upstream";
> +                    break;
>                  case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
>                  case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT:
>                  case VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST:
> @@ -2400,6 +2409,12 @@ qemuAssignDevicePCISlots(virDomainDefPtr def,
>                  /* pcie-root-port can only plug into pcie-root */
>                  flags = VIR_PCI_CONNECT_TYPE_PCIE_ROOT;
>                  break;
> +            case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_UPSTREAM_PORT:
> +                /* pcie-switch really does need a real PCIe
> +                 * port, but it doesn't need to be pcie-root
> +                 */
> +                flags = VIR_PCI_CONNECT_TYPE_PCIE_PORT;
> +                break;
>              default:
>                  flags = VIR_PCI_CONNECT_HOTPLUGGABLE | VIR_PCI_CONNECT_TYPE_PCI;
>                  break;
> @@ -4728,6 +4743,28 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
>                                def->opts.pciopts.type, def->opts.pciopts.port,
>                                def->opts.pciopts.chassis, def->info.alias);
>              break;
> +        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_UPSTREAM_PORT:
> +            if (!def->opts.pciopts.type) {
> +                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                               _("autogenerated dmi-to-pci-bridge options not set"));
> +                goto error;
> +            }
> +            if (STREQ(def->opts.pciopts.type, "x3130-upstream")) {
> +                if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_X3130_UPSTREAM)) {
> +                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> +                                   _("the pcie-switch-upstream-port (x3130-upstream) "
> +                                     "controller is not supported in this QEMU binary"));
> +                goto error;
> +                }
> +            } else {
> +                virReportError(VIR_ERR_INTERNAL_ERROR,
> +                               _("unknown pcie-switch-upstream-port device '%s'"),

similar to previous

unknown pcie-switch-upstream-port option model '%s'

Of course expanding upon Jan's comment in 05/17 these all end up being
conversions from enum type to string which is something I had considered
asking about earlier, but since I didn't have the complete picture in
mind yet I wasn't sure whether it'd be worth it.  I'm 40/50 either way,
but I think with constant char strings you do avoid one extra
alloc/strdup/free cycle.  The default 'type' would then be _NONE and
conversions only necessary if set.  Rather than STREQ you get numerical
comparison.

As I type here I think I'm convincing myself of the value.

John
> +                               def->opts.pciopts.type);
> +                goto error;
> +            }
> +            virBufferAsprintf(&buf, "%s,id=%s",
> +                              def->opts.pciopts.type, def->info.alias);
> +            break;
>          }
>          break;
>  
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-upstream-port.args b/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-upstream-port.args
> new file mode 100644
> index 0000000..c08cd4a
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-pcie-switch-upstream-port.args
> @@ -0,0 +1,12 @@
> +LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
> +/usr/libexec/qemu-kvm -S -M q35 -m 2048 -smp 2 -nographic -nodefaults \
> +-monitor unix:/tmp/test-monitor,server,nowait -no-acpi -boot c \
> +-device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
> +-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x1 \
> +-device ioh3420,port=0x10,chassis=3,id=pci.3,bus=pcie.0,addr=0x2 \
> +-device ioh3420,port=0x18,chassis=4,id=pci.4,bus=pcie.0,addr=0x3 \
> +-device x3130-upstream,id=pci.5,bus=pci.3,addr=0x0 \
> +-device x3130-upstream,id=pci.6,bus=pci.4,addr=0x0 \
> +-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-sata0-0-0 \
> +-device ide-drive,bus=ide.0,drive=drive-sata0-0-0,id=sata0-0-0 \
> +-vga qxl -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=33554432
> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> index 0129717..b42d483 100644
> --- a/tests/qemuxml2argvtest.c
> +++ b/tests/qemuxml2argvtest.c
> @@ -1504,6 +1504,15 @@ mymain(void)
>              QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
>              QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
>  
> +    DO_TEST("pcie-switch-upstream-port",
> +            QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_PCI_BRIDGE,
> +            QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
> +            QEMU_CAPS_DEVICE_IOH3420,
> +            QEMU_CAPS_DEVICE_X3130_UPSTREAM,
> +            QEMU_CAPS_DRIVE, QEMU_CAPS_ICH9_AHCI,
> +            QEMU_CAPS_VGA, QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
> +            QEMU_CAPS_VGA, QEMU_CAPS_VGA_QXL, QEMU_CAPS_DEVICE_QXL);
> +
>      DO_TEST("hostdev-scsi-lsi", QEMU_CAPS_DRIVE,
>              QEMU_CAPS_DEVICE, QEMU_CAPS_DRIVE,
>              QEMU_CAPS_VIRTIO_SCSI, QEMU_CAPS_SCSI_LSI,
> 

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