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From: Peter Xu <peterx@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	linux-mips@vger.kernel.org, peterx@redhat.com,
	Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: [PATCH RFC 0/4] KVM: MIPS: Provide arch-specific kvm_flush_remote_tlbs()
Date: Fri,  7 Feb 2020 17:35:16 -0500
Message-ID: <20200207223520.735523-1-peterx@redhat.com> (raw)

[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(-)

-- 
2.24.1


             reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-07 22:35 Peter Xu [this message]
2020-02-07 22:35 ` [PATCH RFC 1/4] KVM: Provide kvm_flush_remote_tlbs_common() Peter Xu
2020-02-12 13:33   ` Paolo Bonzini
2020-02-07 22:35 ` [PATCH RFC 2/4] KVM: MIPS: Drop flush_shadow_memslot() callback Peter Xu
2020-02-07 22:35 ` [PATCH RFC 3/4] KVM: MIPS: Replace all the kvm_flush_remote_tlbs() references Peter Xu
2020-02-07 22:35 ` [PATCH RFC 4/4] KVM: MIPS: Define arch-specific kvm_flush_remote_tlbs() Peter Xu
2020-03-18  3:03   ` maobibo
2020-03-18 15:28     ` Peter Xu
2020-03-19  2:21       ` maobibo
2020-02-07 23:00 ` [PATCH RFC 0/4] KVM: MIPS: Provide " Peter Xu
2020-02-12 12:25 ` Paolo Bonzini
2020-02-12 16:30   ` Paul Burton
2020-02-12 16:40     ` Paolo Bonzini
2020-02-12 19:02       ` Philippe Mathieu-Daudé
2020-03-11 18:32   ` Peter Xu
2020-03-17 13:33     ` Paolo Bonzini
2020-03-17 14:18       ` Peter Xu

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