So long as you don't have to kill anyone to get the info, I genuinely
appreciate the help.
Question: did you ever kill... Pulling your leg! :-))) _______
Back on the topic/thread: [1] What kind of VM? [2] Does your VM use PCIe Pass-through method (I guess, you must have also in BIOS IOMMU/VT-d ON, this is A MUST)?
*Explanation: PCI Pass-through is a method of giving a VM direct access to a PCI device.*
Thank you, Zoran
On Thu, Mar 30, 2017 at 7:18 PM, Joshua Pincus joshua.pincus@gmail.com wrote:
Hi Zoran,
So long as you don't have to kill anyone to get the info, I genuinely appreciate the help. JP
On Thu, Mar 30, 2017 at 9:54 AM, Zoran Stojsavljevic < zoran.stojsavljevic@gmail.com> wrote:
OK, Joshua!
I do not promise anything. But I, out of (your) desperation, will try to find answers for you. If (no promise)...
If I (eventually) return back, I have only one condition for you: NEVER ask how I found (any future) answer for/to you!
Thank you, Zoran
On Thu, Mar 30, 2017 at 5:48 PM, Joshua Pincus joshua.pincus@gmail.com wrote:
Hi Zoran,
Thanks for your reply.
My situation is this: When the VM guest comes up the first time from a system-level reset (aka power on), the Broadwell HD graphics device runs fine. I see basic VGA both before and during the boot of Windows. Once Windows boots, the HD graphics device is configured by Intel's driver and I see hi-rez output. On a reboot of Windows within the VM, an FLR is issued. When the guest comes back up, no VGA. Windows does boot but provides no VGA output. If Windows needs to drop into VGA mode so that a user can access the real-mode functionality of the recovery console, still no VGA.
It's only on Broadwell-based boards that we have this problem. If we issue FLRs during the reset of the PCI bus for older Intel boards, no problem. We get VGA. Something involved with the FLR is messing up the state of the hardware instead of actually returning the hardware to a virgin state, akin to what you would get from a full system reset.
I was wondering if anyone had seen this kind of behavior. We've tried everything. We've manipulated all of the obvious HD graphics MMIO registers involved with restoring VGA but nothing seems to work.
Thanks, JP
On Thu, Mar 30, 2017 at 4:29 AM, Zoran Stojsavljevic < zoran.stojsavljevic@gmail.com> wrote:
Hello Joshua,
I'll ask similar question, considering UEFI (BIOS). I have no idea if you can issue somehow easy FLR (PCI Function Level Reset), but if you can, does this use case repeat itself?
I found, related to BIOS, this pointer (http://www.tomshardware.co.uk /forum/278002-30-solved-what-capability-option-bios), since I do NOT recall this option in any (legacy and UEFI) of the BIOSes I used (and I used lot (>100) of them). Probably, did not pay too much attention, since I do not recall this option to be tested/used?!
Zoran
On Wed, Mar 29, 2017 at 10:49 PM, Joshua Pincus < joshua.pincus@gmail.com> wrote:
Hi,
After performing just an FLR (PCI function level reset) of a Gen8 Intel HD graphics device, there's no VGA output from the device, no matter what I try to do. I've had coreboot reset the graphics control register, VGA control, VGA display disable bit, etc.
Has anyone seen anything like this? The only way I can get VGA restored is by performing a system-level reset. But I just want to do an FLR. Any ideas?
Thanks, JP
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