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.
NOTE: Patch 1~5 are tested with -cpu xxx,-x2apic option, and they work well.
Patch 6 is not tested yet, not sure if it is right.
Change log v2 -> v3:
1. Remove original [PATCH 3/6] since ept_identity_pagetable has been removed
in new [PATCH 3/6].
2. In [PATCH 3/6], fix the problem that kvm->slots_lock does not protect
kvm->arch.ept_identity_pagetable_done checking.
3. In [PATCH 3/6], drop gfn_to_page() since ept_identity_pagetable has been
removed.
4. Add new [PATCH 4/6], remove redundant variable in init_rmode_identity_map(),
and make it return 0 on success.
5. In [PATCH 5/6], drop put_page(kvm->arch.apic_access_page) from x86.c .
6. In [PATCH 5/6], update kvm->arch.apic_access_page in vcpu_reload_apic_access_page().
7. Add new [PATCH 6/6], reload apic access page in L2->L1 exit.
Change log v1 -> v2:
1. Add [PATCH 4/5] to remove unnecessary kvm_arch->ept_identity_pagetable.
2. In [PATCH 5/5], only introduce KVM_REQ_APIC_PAGE_RELOAD request.
3. In [PATCH 5/5], add set_apic_access_page_addr() for svm.
Tang Chen (6):
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: Remove ept_identity_pagetable from struct kvm_arch.
kvm: Make init_rmode_identity_map() return 0 on success.
kvm, mem-hotplug: Do not pin apic access page in memory.
kvm, mem-hotplug: Reload L1's apic access page if it is migrated when
L2 is running.
arch/x86/include/asm/kvm_host.h | 3 +-
arch/x86/kvm/svm.c | 15 +++++-
arch/x86/kvm/vmx.c | 108 +++++++++++++++++++++++++++-------------
arch/x86/kvm/x86.c | 22 ++++++--
include/linux/kvm_host.h | 3 ++
virt/kvm/kvm_main.c | 29 ++++++++++-
6 files changed, 139 insertions(+), 41 deletions(-)
--
1.8.3.1
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