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KVM: reuse memslot in kvm_write_guest_page

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Caching memslot value and using mark_page_dirty_in_slot() avoids another
O(log N) search when dirtying the page.

Signed-off-by: Radim Krčmář <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Radim Krčmář 2015-04-10 21:47:27 +02:00 • committed by Paolo Bonzini
commit 251eb84144
1 changed files with 4 additions and 2 deletions
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6
virt/kvm/kvm_main.c
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@ -1590,15 +1590,17 @@ int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
int offset, int len)
{
int r;
struct kvm_memory_slot *memslot;
unsigned long addr;
addr = gfn_to_hva(kvm, gfn);
memslot = gfn_to_memslot(kvm, gfn);
addr = gfn_to_hva_memslot(memslot, gfn);
if (kvm_is_error_hva(addr))
return -EFAULT;
r = __copy_to_user((void __user *)addr + offset, data, len);
if (r)
return -EFAULT;
mark_page_dirty(kvm, gfn);
mark_page_dirty_in_slot(kvm, memslot, gfn);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_write_guest_page);