From: Radim Krčmář Date: Fri, 10 Apr 2015 19:47:27 +0000 (+0200) Subject: KVM: reuse memslot in kvm_write_guest_page X-Git-Tag: firefly_0821_release~176^2~1591^2~90 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=251eb84144ec7aba5e344fb8553c67e749655aef;p=firefly-linux-kernel-4.4.55.git KVM: reuse memslot in kvm_write_guest_page 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 Message-Id: <1428695247-27603-1-git-send-email-rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini --- diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 90977418aeb6..b6d415156283 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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);