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

From: Dmitry Fleytman
Subject: Re: [Qemu-devel] [PATCH] vfio/pci-quirks: Set non-zero GMS memory size for IGD
Date: Fri, 28 Jul 2017 08:22:45 +0300

> On 28 Jul 2017, at 07:51 AM, Zhang, Xiong Y <address@hidden> wrote:
>>> 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.


> thanks

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