On Mon, 2018-10-08 at 21:40 +0200, tinyusbboard .matrixstorm wrote:
> Hi
>
> Since commit 28a1f3ac1d0c8558ee4453d9634dad891a6e922e ([PATCH] kvm: x86: Set highest physical address bits in non-present/reserved SPTEs) I have no IO (INPUT and network) on old qemu-VMs using
> -enable-kvm. For example Windows XP-VMs.
>
> My hardware (core2duo E8500 @ 3.16GHz) is quite old, but worked until this patch was committed.
>
> Does anyone have the same issues? What is the reason and how to fix this?
It's a known bug in 4.18.8+ kernels, fixed by commit daa07cbc9ae3
("KVM: x86: fix L1TF's MMIO GFN calculation"), which is available
in v4.19-rc7. I'm not sure when it will propagate to 4.18 kernels,
I assume sooner rather than later.
https://bugzilla.redhat.com/show_bug.cgi?id=1632426
https://patchwork.kernel.org/patch/10614795/
