Re: [Xen-devel] Unable to get QXL vga working

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 24 May 2012, ZhouPeng wrote:
> Sorry for late reply, I am not on this mail these days because of my work.
> 
> I further test qxl-vga and I think I figure out the problem in some extend.
> 
> If using qxl device, the default memory size of vga is 64M.
> Which will cause xen_ram_alloc(qemu/xen-all.c) fails.
> 
> The exact reason is xc_domain_populate_physmap_exact fails, because
> xen-hypervisor
> fail,
> it's because of   alloc_domheap_pages(d, a->extent_order, a->memflags)
> fails in hypervisor.
> 
> I am not very familiar with xen's memory management, Does 64M exceed
> xen's heap space in this context?

XL sets an upper bound of memory that can be allocated to the VM in
libxl__build_pre, calling xc_domain_setmaxmem.
My guess is that a 64MB allocation would go over that limit.
You could try increasing the limit manually changing the
xc_domain_setmaxmem call in libxl__build_pre, or you could try setting
videoram=64 in the VM config file.

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