linux-kernel - [PATCH v2 0/5] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.

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Date:	Tue, 8 Jul 2014 21:01:27 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<gleb@...nel.org>, <mtosatti@...hat.com>, <nadav.amit@...il.com>
CC:	<kvm@...r.kernel.org>, <laijs@...fujitsu.com>,
	<isimatu.yasuaki@...fujitsu.com>, <guz.fnst@...fujitsu.com>,
	<linux-kernel@...r.kernel.org>, <tangchen@...fujitsu.com>
Subject: [PATCH v2 0/5] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.

ept identity pagetable and apic access page in kvm are pinned in memory.
As a result, they cannot be migrated/hot-removed.

But actually they don't need to be pinned in memory.

[For ept identity page]
Just do not pin it. When it is migrated, guest will be able to find the
new page in the next ept violation.

[For apic access page]
The hpa of apic access page is stored in VMCS APIC_ACCESS_ADDR pointer.
When apic access page is migrated, we update VMCS APIC_ACCESS_ADDR pointer
for each vcpu in addition.

Change log v1 -> v2:
1. Add [PATCH 4/5] to remove unnecessary kvm_arch->ept_identity_pagetable.
2. In [PATCH 3/5], only introduce KVM_REQ_APIC_PAGE_RELOAD request.
3. In [PATCH 3/5], add set_apic_access_page_addr() for svm.


Tang Chen (5):
  kvm: Add gfn_to_page_no_pin() to translate gfn to page without
    pinning.
  kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic access page address.
  kvm, mem-hotplug: Do not pin ept identity pagetable in memory.
  kvm: Remove ept_identity_pagetable from struct kvm_arch.
  kvm, mem-hotplug: Do not pin apic access page in memory.

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/mmu.c              | 11 +++++++++++
 arch/x86/kvm/svm.c              |  9 ++++++++-
 arch/x86/kvm/vmx.c              | 40 ++++++++++++++++++++++------------------
 arch/x86/kvm/x86.c              | 16 ++++++++++++++--
 include/linux/kvm_host.h        |  3 +++
 virt/kvm/kvm_main.c             | 29 ++++++++++++++++++++++++++++-
 7 files changed, 87 insertions(+), 23 deletions(-)

-- 
1.8.3.1

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