We are working on a fix. Can you give this testpatch a spin?
** Patch added: "testpatch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1845323/+attachment/5291775/+files/0001-s390-dasd-Fix-error-handling-during-online-processin.patch
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tested and reviewed.
applied as 3216:15852
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https://bugs.launchpad.net/bugs/1556765
Title:
Valgrind command valgrind /bin/true shows error
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My modprobe.conf solution might not work in all cases, as the kvm module might
be loaded on demand by a process accessing /dev/kvm. That process then already
has 2k page tables.
So I agree with Viktor: If we want to support KVM, maybe set
vm.allocate_pgste = 1 unconditionally.
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ok, kvm builtin certainly makes sense if you plan to use it regularly.
So in essence its a question about: do we expect a number of users to use KVM
in Ubuntu or not?
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the TCG emulation of QEMU does work without allocatr_pgste.
vm.allocate_pgste=1 is necessary to use the KVM kernel module (which is used by
qemu in kvm mode)
The main difference is that this uses 4k page tables instead of 2k page
tables on s390. So enabling pgstes will increase the page table
ov
