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Re: [Qemu-devel] [PATCH] vfio/pci-quirks: Set non-zero GMS memory size f

From: Zhang, Xiong Y
Subject: Re: [Qemu-devel] [PATCH] vfio/pci-quirks: Set non-zero GMS memory size for IGD
Date: Fri, 28 Jul 2017 04:51:03 +0000

> > On 26 Jul 2017, at 08:22 AM, Zhang, Xiong Y <address@hidden>
> wrote:
> >
> > Sorry, we indeed found Intel windows guest graphic driver couldn't be bind
> when GMS memory size is zero. And we have fixed it and the next intel
> windows driver release will contain this fix.
> > So currently please use x-igd-gms in legacy mode to work around this.
> >
> > BTW, how did you know window driver allocate extra ~4G memory when
> GMS size set to 0 ?
> We noticed that with new IGD driver memory usage on VMs raised by around
> 4G.
> Then we examined memory allocations with poolmon
> (https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/poolm
> on)
> and saw that around 4G of memory is allocated with IGD driver pool tag.
> Additionally we noticed that on VMs with less than 5G of memory IGD driver
> does not load and system does fallback to standard VGA driver.
[Zhang, Xiong Y]  I tried our internal driver and didn't found the above two 
issues, please wait for the next intel graphic driver release.


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