I'm attaching the workaround I use with linux 5.2.1 and a w8.1 guest.
I'm not saying you should use it, as it probably has a negative effect
on performance (I never benchmarked it, but I didn't notice anything
with older games) but at least you could confirm whether you have the
same problem or not.
Regards,
Zoltan
On 2019-08-03 13:35, Ivan Volosyuk wrote:
I just hit the problem on Windows 8.1 guest on kernel 5.2.5 (gentoo), tried
to upgrade from kernel 4.19.57.
It seems the problem doesn't happen if I use Windows 10 guest or kernel
4.19.57.
There is graphics artifacts on my RTX-2080TI in W8.1 guest. I temporary
switched to older kernel. Any news about this? Any way to debug it?
On Thu, Aug 1, 2019 at 5:08 AM Zoltán Kővágó <[email protected]> wrote:
On 2019-07-31 15:41, José Ramón Muñoz Pekkarinen wrote:
On Sun, 21 Jul 2019 at 21:59, Zoltán Kővágó <[email protected]>
wrote:
Hi,
Recently my previously perfectly working GPU passthrough setup (with a
win8.1 x64 guest with OVMF) started to malfunction in various ways:
screen randomly turned off for a few seconds, BSOD with
VIDEO_TDR_FAILURE, 3d apps randomly crashing, not drawing the windows'
content, and graphical glitches (for example in furmark the OSD text
flickers).
After fiddling around with various qemu versions, nvidia driver versions
on the guest, I figured out that with a linux 5.0 kernel it works fine,
but with 5.1 it randomly fails. I bisected it and it looks like the
culprit is the commit 4e103134b862 "KVM: x86/mmu: Zap only the relevant
pages when removing a memslot"[1]. I tried to revert in on top of 5.2.1
but too many things changed in the meantime. Anyway, if I replace the
body of kvm_mmu_invalidate_zap_pages_in_memslot with
kvm_mmu_zap_all(kvm); it works again (probably with horrible performance
degradation).
Did anyone experience anything like this? I'm using Alex's ACS override
patch, maybe it violates some assumption that the new code has?
Hi,
I noticed some changes that made 5.0 not working well when
detecting screen speakers through hdmi, but this I didn't see anytime.
My problem flew away with 5.1.15(the one I currently use), and no
other spread. I never needed the ACS override patch in my setup,
what happen if you try without it, does your groups comes wrong in
any ways?
Best regards.
José.
Hi,
Unfortunately without pcie_acs_override=downstream my iommu groups look
like this (i.e. both video cards and their pci bridges are in one
group), and I never had a problem with it in the last ~4.5 years.
# ls /sys/kernel/iommu_groups/*/devices
/sys/kernel/iommu_groups/0/devices:
0000:00:00.0
/sys/kernel/iommu_groups/10/devices:
0000:00:1c.3
/sys/kernel/iommu_groups/11/devices:
0000:00:1d.0
/sys/kernel/iommu_groups/12/devices:
0000:00:1f.0 0000:00:1f.2 0000:00:1f.3
/sys/kernel/iommu_groups/1/devices:
0000:00:01.0 0000:00:01.1 0000:01:00.0 0000:01:00.1 0000:02:00.0
0000:02:00.1
/sys/kernel/iommu_groups/2/devices:
0000:00:02.0
/sys/kernel/iommu_groups/3/devices:
0000:00:03.0
/sys/kernel/iommu_groups/4/devices:
0000:00:14.0
/sys/kernel/iommu_groups/5/devices:
0000:00:16.0
/sys/kernel/iommu_groups/6/devices:
0000:00:19.0
/sys/kernel/iommu_groups/7/devices:
0000:00:1a.0
/sys/kernel/iommu_groups/8/devices:
0000:00:1b.0
/sys/kernel/iommu_groups/9/devices:
0000:00:1c.0
Regards,
Zoltan
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--- arch/x86/kvm/mmu.c.orig 2019-08-03 19:03:56.389283539 +0200
+++ arch/x86/kvm/mmu.c 2019-08-03 19:04:17.807615592 +0200
@@ -5649,38 +5649,7 @@
struct kvm_memory_slot *slot,
struct kvm_page_track_notifier_node *node)
{
- struct kvm_mmu_page *sp;
- LIST_HEAD(invalid_list);
- unsigned long i;
- bool flush;
- gfn_t gfn;
-
- spin_lock(&kvm->mmu_lock);
-
- if (list_empty(&kvm->arch.active_mmu_pages))
- goto out_unlock;
-
- flush = slot_handle_all_level(kvm, slot, kvm_zap_rmapp, false);
-
- for (i = 0; i < slot->npages; i++) {
- gfn = slot->base_gfn + i;
-
- for_each_valid_sp(kvm, sp, gfn) {
- if (sp->gfn != gfn)
- continue;
-
- kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
- }
- if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {
- kvm_mmu_remote_flush_or_zap(kvm, &invalid_list, flush);
- flush = false;
- cond_resched_lock(&kvm->mmu_lock);
- }
- }
- kvm_mmu_remote_flush_or_zap(kvm, &invalid_list, flush);
-
-out_unlock:
- spin_unlock(&kvm->mmu_lock);
+ kvm_mmu_zap_all(kvm);
}
void kvm_mmu_init_vm(struct kvm *kvm)
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