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Re: [Qemu-devel] [qemu-s390x] [PATCH-for-4.2 v1 5/6] s390x/mmu: Better s
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From: |
David Hildenbrand |
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Subject: |
Re: [Qemu-devel] [qemu-s390x] [PATCH-for-4.2 v1 5/6] s390x/mmu: Better storage key reference and change bit handling |
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Date: |
Wed, 14 Aug 2019 09:20:01 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 |
On 13.08.19 16:54, Cornelia Huck wrote:
> On Mon, 12 Aug 2019 13:27:36 +0200
> David Hildenbrand <address@hidden> wrote:
>
>> Any access sets the reference bit. In case we have a read-fault, we
>> should not allow writes to the TLB entry if the change bit was not
>> already set.
>>
>> This is a preparation for proper storage-key reference/change bit handling
>> in TCG and a fix for KVM whereby read accesses would set the change
>> bit (old KVM versions without the ioctl to carry out the translation).
>
> That would be really old kvm versions, right? So no real need to e.g.
> cc:stable?
Yes - nothing a distribution ever supported AFAIK.
--
Thanks,
David / dhildenb
[Qemu-devel] [PATCH-for-4.2 v1 3/6] s390x/tcg: Flush the TLB of all CPUs on SSKE and RRBE, David Hildenbrand, 2019/08/12
[Qemu-devel] [PATCH-for-4.2 v1 4/6] s390x/mmu: Trace the right value if setting/getting the storage key fails, David Hildenbrand, 2019/08/12
[Qemu-devel] [PATCH-for-4.2 v1 5/6] s390x/mmu: Better storage key reference and change bit handling, David Hildenbrand, 2019/08/12
[Qemu-devel] [PATCH-for-4.2 v1 6/6] s390x/mmu: Factor out storage key handling, David Hildenbrand, 2019/08/12