Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1215884

[PATCH RFC 0/3] kvm add ioeventfd pf capability

Show all headers | View raw

One of the reasons MMIO is slower than port IO is
because it requires a page table lookup.
For normal memory accesses, this is solved by using the TLB
cache - but MMIO entries are either not present or reserved
and so are never cached.

To fix, allow installing an ioeventfd on top of a read only
memory region, which allows the CPU to cache the translations.

Warning: svm patch is untested.

Michael S. Tsirkin (3):
  vmx: allow ioeventfd for EPT violations
  svm: allow ioeventfd for NPT page faults
  kvm: add KVM_CAP_IOEVENTFD_PF capability

 include/uapi/linux/kvm.h          | 1 +
 arch/x86/kvm/svm.c                | 5 +++++
 arch/x86/kvm/vmx.c                | 5 +++++
 arch/x86/kvm/x86.c                | 1 +
 Documentation/virtual/kvm/api.txt | 7 +++++++
 5 files changed, 19 insertions(+)

-- 
MST

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH RFC 0/3] kvm add ioeventfd pf capability "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-30 11:20 +0200
  [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-30 11:20 +0200
    Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2015-08-31 05:10 +0200
      Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-31 09:50 +0200
        Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2015-08-31 10:40 +0200
          Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-31 13:30 +0200
            Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2015-08-31 15:30 +0200
              Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-31 17:00 +0200
    Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations Jason Wang <jasowang@redhat.com> - 2015-09-01 05:40 +0200
      Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-09-01 06:40 +0200
        Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations Jason Wang <jasowang@redhat.com> - 2015-09-01 06:50 +0200
          Re: [PATCH RFC 1/3] vmx: allow ioeventfd for EPT violations "Michael S. Tsirkin" <mst@redhat.com> - 2015-09-01 09:00 +0200
  [PATCH RFC 2/3] svm: allow ioeventfd for NPT page faults "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-30 11:20 +0200
  [PATCH RFC 3/3] kvm: add KVM_CAP_IOEVENTFD_PF capability "Michael S. Tsirkin" <mst@redhat.com> - 2015-08-30 11:20 +0200

csiph-web