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

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Message-ID: <1440925898-23440-1-git-send-email-mst@redhat.com>
Date:	Sun, 30 Aug 2015 12:12:41 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH RFC 0/3] kvm add ioeventfd pf capability

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

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