KVM: MMU: Optimize is_last_gpte()
Instead of branchy code depending on level, gpte.ps, and mmu configuration,
prepare everything in a bitmap during mode changes and look it up during
runtime.
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3318bde..43aeb94 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -298,6 +298,13 @@
u64 *lm_root;
u64 rsvd_bits_mask[2][4];
+ /*
+ * Bitmap: bit set = last pte in walk
+ * index[0:1]: level (zero-based)
+ * index[2]: pte.ps
+ */
+ u8 last_pte_bitmap;
+
bool nx;
u64 pdptrs[4]; /* pae */