On 2020-04-23 13:54, Suravee Suthikulpanit wrote:
Boris,
On 4/22/20 12:43 PM, Boris V. wrote:
Hello,
when running qemu with GPU passthrough it crashes with 5.6 and also
5.7-rc kernels, it works with 5.5 and lower.
Without GPU passthrough I don't see this crash.
With bisecting, I found commit that causes this BUG.
It seems bad commit is f458d039db7e8518041db4169d657407e3217008, if I
revert this patch it works.
Could you please try the following patch?
Thanks,
Suravee
--- BEGIN PATCH ---
commit 5a605d65a71583195f64d42f39a29c771e2c763a
Author: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Date: Thu Apr 23 06:40:11 2020 -0500
kvm: ioapic: Introduce arch-specific check for lazy update EOI
mechanism
commit f458d039db7e ("kvm: ioapic: Lazy update IOAPIC EOI")
introduces
a regression on Intel VMX APICv since it always force IOAPIC lazy
update
EOI mechanism when APICv is activated, which is needed to support AMD
SVM AVIC.
Fixes by introducing struct kvm_arch.use_lazy_eoi variable to specify
whether the architecture needs lazy update EOI support.
Fixes: f458d039db7e ("kvm: ioapic: Lazy update IOAPIC EOI")
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/ioapic.c | 3 +++
arch/x86/kvm/svm.c | 1 +
3 files changed, 6 insertions(+)
Yes, this this patch works, there is no longer kernel BUG.
Thanks,
Boris
