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kvm: x86: Unpin and remove kvm_arch->apic_access_page

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In order to make the APIC access page migratable, stop pinning it in
memory.

And because the APIC access page is not pinned in memory, we can
remove kvm_arch->apic_access_page.  When we need to write its
physical address into vmcs, we use gfn_to_page() to get its page
struct, which is needed to call page_to_phys(); the page is then
immediately unpinned.

Suggested-by: Gleb Natapov <gleb@kernel.org>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tang Chen
2014-09-24 15:57:58 +08:00
committed by Paolo Bonzini
parent 38b9917350
commit c24ae0dcd3
3 changed files with 24 additions and 9 deletions
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9
arch/x86/kvm/vmx.c
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@@ -4033,7 +4033,7 @@ static int alloc_apic_access_page(struct kvm *kvm)
int r = 0;
mutex_lock(&kvm->slots_lock);
if (kvm->arch.apic_access_page)
if (kvm->arch.apic_access_page_done)
goto out;
kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
kvm_userspace_mem.flags = 0;
@@ -4049,7 +4049,12 @@ static int alloc_apic_access_page(struct kvm *kvm)
goto out;
}
kvm->arch.apic_access_page = page;
/*
* Do not pin the page in memory, so that memory hot-unplug
* is able to migrate it.
*/
put_page(page);
kvm->arch.apic_access_page_done = true;
out:
mutex_unlock(&kvm->slots_lock);
return r;