Re: [PATCH v8 0/8] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.

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Hi Paolo,

I'd like to help to test the patches.
Would you please tell me what is the best way to test this patch-set ?

I think ept page is being used by regular guest.
Is adding "-cpu xxx,-x2apic option" able to make sure guest is using
apic page ?

Thanks.

On 09/24/2014 04:20 PM, Paolo Bonzini wrote:
Il 24/09/2014 09:57, Tang Chen ha scritto:
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 v7->v8:
1. Patch 1/9~3/9 were applied to kvm/queue by Paolo Bonzini <pbonzini@xxxxxxxxxx>.
    Just resend them, no changes.
2. Removed previous patch 4/9, which added unnecessary hook has_secondary_apic_access().
3. Set kvm_x86_ops->set_apic_access_page_addr to NULL when hardware had no flexpriority
    functionality which actually exists only on x86.
4. Moved declaration of kvm_arch_mmu_notifier_invalidate_page() to arch/*/include/asm/kvm_host.h.
5. Removed useless set_apic_access_page_addr() hook for svm.

Tang Chen (8):
   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, 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/arm/include/asm/kvm_host.h     |   5 ++
  arch/arm64/include/asm/kvm_host.h   |   5 ++
  arch/ia64/include/asm/kvm_host.h    |   7 ++
  arch/mips/include/asm/kvm_host.h    |   6 ++
  arch/powerpc/include/asm/kvm_host.h |   5 ++
  arch/s390/include/asm/kvm_host.h    |   8 +++
  arch/x86/include/asm/kvm_host.h     |   7 +-
  arch/x86/kvm/svm.c                  |   3 +-
  arch/x86/kvm/vmx.c                  | 130 ++++++++++++++++++++++++------------
  arch/x86/kvm/x86.c                  |  45 +++++++++++--
  include/linux/kvm_host.h            |   2 +
  virt/kvm/kvm_main.c                 |  13 ++--
  12 files changed, 180 insertions(+), 56 deletions(-)

Thanks for your persistence!  The patches look good, I'll test them and
apply to kvm/queue.

Paolo
.


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