Tag	Download	Author	Age
xf86-video-qxl-0.1.5	commit 8d344cf49f..	Christophe Fergeau	4 years
xf86-video-qxl-0.1.4	commit fc5327bc56..	Christophe Fergeau	6 years
xf86-video-qxl-0.1.3	commit f4964c5666..	Christophe Fergeau	7 years
xf86-video-qxl-0.1.2	commit 6210f34e35..	Alon Levy	7 years
xf86-video-qxl-0.1.1	commit 516c07ea58..	Alon Levy	8 years
xf86-video-qxl-0.1.0	commit d8bb331784..	Søren Sandmann Pedersen	9 years
wip/randr12.v1	commit 6d46786795..	Alon Levy	9 years
xf86-video-qxl-0.0.17	commit b75eed01fa..	Søren Sandmann Pedersen	9 years
xf86-video-qxl-0.0.16	commit dd90fa9277..	Alon Levy	10 years
xf86-video-qxl-0.0.15	commit ec418d246d..	Alon Levy	10 years
xf86-video-qxl-0.0.14	commit 9b915fab9d..	Søren Sandmann Pedersen	10 years
rhel-6.1	commit 9ae9a23858..	Søren Sandmann Pedersen	10 years
xf86-video-qxl-0.0.13	commit 4bfbdbb821..	Søren Sandmann Pedersen	10 years
xf86-video-qxl-0.0.12	commit aa91dc597c..	Søren Sandmann Pedersen	11 years
xf86-video-qxl-0.0.11	commit 4f1a188f6b..	Søren Sandmann Pedersen	11 years
xf86-video-qxl-0.0.9	commit 57aaaa7e27..	Dave Airlie	11 years
xf86-video-qxl-0.0.6	commit 335f16154d..	Dave Airlie	11 years

This developer documentation is outdated, but provides historical context.
It is not user documentation and should not be treated as such.
Documentation is available here.

There is a lot of confusion about video RAM settings and workings in libvirt/QEMU. This page provides compilation of information on the topic gathered from many sources and represents the best knowledge available as of December 2015.

QXL driver is a video driver for the QEMU QXL video accelerator. It’s used for improving remote display performance and enhancing the graphic capabilities of the guest graphic system. However, standard VGA is supported when no driver exists. QXL virtual GPU video driver for the Xorg X server. Qxl is an Xorg driver for QXL virtual GPU as found in the spice project. The protocol is the specification in the communication of the three other components; A client such as remote-viewer is responsible to send data and translate the data from the Virtual Machine (VM) so you can interact with it; The SPICE server is the library used by the hypervisor in order to share the VM under SPICE protocol; And finally, the.

State in oVirt until 3.6

The following video RAM settings were applied in oVirt per PCI device:

ram = 64 MB * number_of_heads
vram = 32 MB
vgamem = unset (default 16 MB set by libvirt)

Note: If single-PCI option is not set, number_of_heads is always 1 and “heads” option in the Engine defines number of separate video devices. If single-PCI option is set, there is only single video device and “heads” Engine option transforms to number_of_heads above.

libvirt

Meanings of <video> element attributes in domain XML:

ram (KB) specifies primary memory bar size, corresponds to ram_size (B) QEMU command line option.
vram (KB) specifies secondary memory bar size, corresponds to vram_size (B) QEMU command line option.
vgamem (KB) must be set to at least certain minimum value based on screen resolution and number of heads, corresponds to vgamem_mb (MB) QEMU command line option. vgamem libvirt option is available since RHEL-7.1; vgamem_mb QEMU option is available since RHEL-6.7.

QXL QEMU driver

Please note that all the information about video RAM sizes below should be taken with grain of salt. Nobody knows the perfect ultimate answer to that topic, there are different guest OS drivers and as stated above, things may completely change in oVirt 4. Users should be able to override the computed default settings if they use uncommon arrangements or the computed values don’t work well for them. This can be done using before_vm_start VDSM hook.

You can look for implementation details in qxl.c in QEMU sources. But don’t rely on anything, things may change, so it’s a good idea to get confirmation from QEMU and/or libvirt developers about everything.

Spice Guest Tools

libvirt ram represents primary memory bar, 32-bit only. libvirt vram represents secondary memory bar, 64-bit (it may not be true as of now, there is a separate vram_size_mb QEMU command line option for that, not necessarily used by libvirt).

vgamem is allocated within ram. Minimum ram size, as enforced by QEMU regardless the command line settings, is 2 * vgamem. vram is allocated separately.

Maximum supported screen resolution is 4 megapixels (2560x1600). Maximum number of heads is 4.

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Microsoft lifecam 1.0 software download. The required memory sizes are basically dependent on screen resolution multiplied by number of heads. But this should actually be the bounding rectangle of the screen arrangement. For instance, let’s assume 4 screens with resolution 1024x768 each. If they are arranged compactly in a single row or in two rows and two columns, it’s fine, memory for 3 megapixels is required. But if three screens are in a row and the fourth screen is below them then the required memory may correspond (depending on the driver) to 4.5 (3072x1536) megapixels; when all the screens are arranged diagonally, it’s 12 (4096x3072) megapixels. We don’t assume such setups when computing memory values.

Due to 32-bit addressing in QEMU, total (for all video cards together) maximum size of ram is 256 or 512 MB. TODO: Check what happens when we specify more.

All memory sizes should be specified as powers of 2. This is not a strict requirement, it’s just advised. Indic language input tool.

Video RAM is allocated in addition to specified guest main RAM, not within it.

The recommended memory sizes are dependent on particular guest OS and its drive

Qxl Driver