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SubjectRe: [PATCH RFC 0/4] KVM: MIPS: Provide arch-specific kvm_flush_remote_tlbs()
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On 11/03/20 19:32, Peter Xu wrote:
> On Wed, Feb 12, 2020 at 01:25:30PM +0100, Paolo Bonzini wrote:
>> On 07/02/20 23:35, Peter Xu wrote:
>>> [This series is RFC because I don't have MIPS to compile and test]
>>>
>>> kvm_flush_remote_tlbs() can be arch-specific, by either:
>>>
>>> - Completely replace kvm_flush_remote_tlbs(), like ARM, who is the
>>> only user of CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL so far
>>>
>>> - Doing something extra before kvm_flush_remote_tlbs(), like MIPS VZ
>>> support, however still wants to have the common tlb flush to be part
>>> of the process. Could refer to kvm_vz_flush_shadow_all(). Then in
>>> MIPS it's awkward to flush remote TLBs: we'll need to call the mips
>>> hooks.
>>>
>>> It's awkward to have different ways to specialize this procedure,
>>> especially MIPS cannot use the genenal interface which is quite a
>>> pity. It's good to make it a common interface.
>>>
>>> This patch series removes the 2nd MIPS usage above, and let it also
>>> use the common kvm_flush_remote_tlbs() interface. It should be
>>> suggested that we always keep kvm_flush_remote_tlbs() be a common
>>> entrance for tlb flushing on all archs.
>>>
>>> This idea comes from the reading of Sean's patchset on dynamic memslot
>>> allocation, where a new dirty log specific hook is added for flushing
>>> TLBs only for the MIPS code [1]. With this patchset, logically the
>>> new hook in that patch can be dropped so we can directly use
>>> kvm_flush_remote_tlbs().
>>>
>>> TODO: We can even extend another common interface for ranged TLB, but
>>> let's see how we think about this series first.
>>>
>>> Any comment is welcomed, thanks.
>>>
>>> Peter Xu (4):
>>> KVM: Provide kvm_flush_remote_tlbs_common()
>>> KVM: MIPS: Drop flush_shadow_memslot() callback
>>> KVM: MIPS: Replace all the kvm_flush_remote_tlbs() references
>>> KVM: MIPS: Define arch-specific kvm_flush_remote_tlbs()
>>>
>>> arch/mips/include/asm/kvm_host.h | 7 -------
>>> arch/mips/kvm/Kconfig | 1 +
>>> arch/mips/kvm/mips.c | 22 ++++++++++------------
>>> arch/mips/kvm/trap_emul.c | 15 +--------------
>>> arch/mips/kvm/vz.c | 14 ++------------
>>> include/linux/kvm_host.h | 1 +
>>> virt/kvm/kvm_main.c | 10 ++++++++--
>>> 7 files changed, 23 insertions(+), 47 deletions(-)
>>>
>>
>> Compile-tested and queued.
>
> Just in case it fells through the crach - Paolo, do you still have
> plan to queue this again?

Yes, I wanted to make it compile first though. I'm undecided between
queuing your series and killing KVM MIPS honestly.

Paolo

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