[libvirt] [Spice-devel] [RFC PATCH] qemu: Use heads parameter for QXL driver
Christophe Fergeau
cfergeau at redhat.com
Thu Jun 11 14:26:39 UTC 2015
Hey,
On Thu, Jun 11, 2015 at 12:39:50PM +0100, Frediano Ziglio wrote:
> Allow to specify maximum number of head to QXL driver.
I've tested this with an older qemu without qxl-vga.max_outputs, and
with a newer one with support for it, and in both cases this is doing
the right thing.
>
> Signed-off-by: Frediano Ziglio <fziglio at redhat.com>
> ---
> src/qemu/qemu_capabilities.c | 2 ++
> src/qemu/qemu_capabilities.h | 1 +
> src/qemu/qemu_command.c | 11 +++++++++++
> tests/qemucapabilitiesdata/caps_1.2.2-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.2.2-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_1.3.1-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.3.1-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_1.4.2-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.4.2-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_1.5.3-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.5.3-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_1.6.0-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.6.0-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_1.6.50-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_1.6.50-1.replies | 8 ++++++++
> tests/qemucapabilitiesdata/caps_2.1.1-1.caps | 1 +
> tests/qemucapabilitiesdata/caps_2.1.1-1.replies | 8 ++++++++
> 17 files changed, 77 insertions(+)
>
> The patch to support the "max_outputs" in Qemu is still not merged but
> I got agreement on the name of the argument.
>
> Actually can be a compatiblity problem as heads in the XML configuration
> was set by default to '1'.
>
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index ca7a7c2..cdc2575 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -285,6 +285,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
> "dea-key-wrap",
> "pci-serial",
> "aarch64-off",
> + "qxl-vga.max_outputs",
> );
In order to be consistent with the rest of the file, this should be
+
+ "qxl-vga.max_outputs", /* 190 */
>
>
> @@ -1643,6 +1644,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsQxl[] = {
>
> static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsQxlVga[] = {
> { "vgamem_mb", QEMU_CAPS_QXL_VGA_VGAMEM },
> + { "max_outputs", QEMU_CAPS_QXL_VGA_MAX_OUTPUTS },
> };
>
> struct virQEMUCapsObjectTypeProps {
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index b5a7770..a2ea84b 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -229,6 +229,7 @@ typedef enum {
> QEMU_CAPS_DEA_KEY_WRAP = 187, /* -machine dea_key_wrap */
> QEMU_CAPS_DEVICE_PCI_SERIAL = 188, /* -device pci-serial */
> QEMU_CAPS_CPU_AARCH64_OFF = 189, /* -cpu ...,aarch64=off */
> + QEMU_CAPS_QXL_VGA_MAX_OUTPUTS = 190, /* qxl-vga.max_outputs */
>
> QEMU_CAPS_LAST, /* this must always be the last item */
> } virQEMUCapsFlags;
> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 0a6d92f..2bd63e1 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -5610,6 +5610,11 @@ qemuBuildDeviceVideoStr(virDomainDefPtr def,
> /* QEMU accepts mebibytes for vgamem_mb. */
> virBufferAsprintf(&buf, ",vgamem_mb=%u", video->vgamem / 1024);
> }
> +
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_QXL_VGA_MAX_OUTPUTS) &&
> + video->heads > 0) {
> + virBufferAsprintf(&buf, ",max_outputs=%u", video->heads);
> + }
> } else if (video->vram &&
> ((video->type == VIR_DOMAIN_VIDEO_TYPE_VGA &&
> virQEMUCapsGet(qemuCaps, QEMU_CAPS_VGA_VGAMEM)) ||
> @@ -10234,6 +10239,7 @@ qemuBuildCommandLine(virConnectPtr conn,
> unsigned int ram = def->videos[0]->ram;
> unsigned int vram = def->videos[0]->vram;
> unsigned int vgamem = def->videos[0]->vgamem;
> + unsigned int heads = def->videos[0]->heads;
>
> if (vram > (UINT_MAX / 1024)) {
> virReportError(VIR_ERR_OVERFLOW,
> @@ -10264,6 +10270,11 @@ qemuBuildCommandLine(virConnectPtr conn,
> virCommandAddArgFormat(cmd, "%s.vgamem_mb=%u",
> dev, vgamem / 1024);
> }
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_QXL_VGA_MAX_OUTPUTS) && heads > 0) {
> + virCommandAddArg(cmd, "-global");
> + virCommandAddArgFormat(cmd, "%s.max_outputs=%u",
> + dev, heads);
> + }
This part of the code is a fallback for QEMU not supporting -device. As
the max_outputs option is new, I'm not sure this will ever be triggered.
> }
>
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE) &&
> diff --git a/tests/qemucapabilitiesdata/caps_1.2.2-1.caps b/tests/qemucapabilitiesdata/caps_1.2.2-1.caps
> index 30239df..7791e42 100644
> --- a/tests/qemucapabilitiesdata/caps_1.2.2-1.caps
> +++ b/tests/qemucapabilitiesdata/caps_1.2.2-1.caps
> @@ -120,4 +120,5 @@
> <flag name='vmware-svga.vgamem_mb'/>
> <flag name='qxl.vgamem_mb'/>
> <flag name='qxl-vga.vgamem_mb'/>
> + <flag name='qxl-vga.max_outputs'/>
> </qemuCaps>
> diff --git a/tests/qemucapabilitiesdata/caps_1.2.2-1.replies b/tests/qemucapabilitiesdata/caps_1.2.2-1.replies
> index f501218..aa1d3f9 100644
> --- a/tests/qemucapabilitiesdata/caps_1.2.2-1.replies
> +++ b/tests/qemucapabilitiesdata/caps_1.2.2-1.replies
> @@ -1488,6 +1488,10 @@
> "type": "pci-devfn"
> },
> {
> + "name": "max_outputs",
> + "type": "uint16"
> + },
> + {
> "name": "vgamem_mb",
> "type": "uint32"
> },
> @@ -1554,6 +1558,10 @@
> "type": "pci-devfn"
> },
> {
> + "name": "max_outputs",
> + "type": "uint16"
> + },
> + {
> "name": "vgamem_mb",
> "type": "uint32"
> },
I have no idea how all these tests work, so I have only took a quick
look, and checked that make check still passes. I find it odd to have
qxl-vga.max_outputs be listed for older qemu releases, but maybe this is
how it's meant to be done.
All in all, looks good to me.
Christophe
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