KVM: MMU: Clean up BUG_ON() conditions in rmap_write_protect()

Remove redundant checks and use is_large_pte() macro.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a9b3a32..973f254 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1027,7 +1027,6 @@ static int rmap_write_protect(struct kvm *kvm, u64 gfn)
 
        spte = rmap_next(kvm, rmapp, NULL);
        while (spte) {
-               BUG_ON(!spte);
                BUG_ON(!(*spte & PT_PRESENT_MASK));
                rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
                if (is_writable_pte(*spte)) {
@@ -1043,9 +1042,8 @@ static int rmap_write_protect(struct kvm *kvm, u64 gfn)
                rmapp = gfn_to_rmap(kvm, gfn, i);
                spte = rmap_next(kvm, rmapp, NULL);
                while (spte) {
-                       BUG_ON(!spte);
                        BUG_ON(!(*spte & PT_PRESENT_MASK));
-                       BUG_ON((*spte & (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK)) != (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK));
+                       BUG_ON(!is_large_pte(*spte));
                        pgprintk("rmap_write_protect(large): spte %p %llx %lld\n", spte, *spte, gfn);
                        if (is_writable_pte(*spte)) {
                                drop_spte(kvm, spte);