linux-kernel - [PATCH v7 0/9] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.

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Message-ID: <1411210071-14727-1-git-send-email-tangchen@cn.fujitsu.com>
Date:	Sat, 20 Sep 2014 18:47:42 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<gleb@...nel.org>, <mtosatti@...hat.com>, <nadav.amit@...il.com>,
	<jan.kiszka@....de>, <pbonzini@...hat.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 v7 0/9] 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.

This patch-set is based on Linux 3.17.0-rc5.

NOTE: Tested with -cpu xxx,-x2apic option.
      But since nested vm pins some other pages in memory, if user uses nested
      vm, memory hot-remove will not work.

Change log v6 -> v7:
1. Patch 1/9~3/9 are applied to kvm/queue by Paolo Bonzini <pbonzini@...hat.com>.
   Just resend them, no changes.
2. In the new patch 4/9, add a new interface to check if secondary exec 
   virtualized apic access is enabled.
3. In new patch 6/9, rename make_all_cpus_request() to kvm_make_all_cpus_request() 
   and make it non-static so that we can use it in other patches.
4. In new patch 8/9, add arch specific function to make apic access page reload 
   request in mmu notifier.

Tang Chen (9):
  kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic access page address.
  kvm: Remove ept_identity_pagetable from struct kvm_arch.
  kvm: Make init_rmode_identity_map() return 0 on success.
  kvm: Add interface to check if secondary exec virtualzed apic accesses
    is enabled.
  kvm, mem-hotplug: Reload L1's apic access page in vcpu_enter_guest().
  kvm: Rename make_all_cpus_request() to kvm_make_all_cpus_request() and
    make it non-static.
  kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is
    running.
  kvm, mem-hotplug: Add arch specific mmu notifier to handle apic access
    migration.
  kvm, mem-hotplug: Unpin and remove kvm_arch->apic_access_page.

 arch/x86/include/asm/kvm_host.h |   6 ++-
 arch/x86/kvm/svm.c              |  15 +++++-
 arch/x86/kvm/vmx.c              | 104 ++++++++++++++++++++++++----------------
 arch/x86/kvm/x86.c              |  47 ++++++++++++++++--
 include/linux/kvm_host.h        |  16 ++++++-
 virt/kvm/kvm_main.c             |  13 +++--
 6 files changed, 146 insertions(+), 55 deletions(-)

-- 
1.8.3.1

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