KVM: MMU: simplify last_pte_bitmap

Branch-free code is fun and everybody knows how much Avi loves it,
but last_pte_bitmap takes it a bit to the extreme.  Since the code
is simply doing a range check, like

	(level == 1 ||
	 ((gpte & PT_PAGE_SIZE_MASK) && level < N)

we can make it branch-free without storing the entire truth table;
it is enough to cache N.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 28 insertions, 30 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1c3e390993a2..d110dc44d6c2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -347,12 +347,8 @@ struct kvm_mmu {
 
         struct rsvd_bits_validate guest_rsvd_check;
 
-        /*
-         * Bitmap: bit set = last pte in walk
-         * index[0:1]: level (zero-based)
-         * index[2]: pte.ps
-         */
-        u8 last_pte_bitmap;
+        /* Can have large pages at levels 2..last_nonleaf_level-1. */
+        u8 last_nonleaf_level;
 
         bool nx;
 
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 754d2c4f6f99..2463de0b935c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3632,13 +3632,24 @@ static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
         return false;
 }
 
-static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte)
+static inline bool is_last_gpte(struct kvm_mmu *mmu,
+                                unsigned level, unsigned gpte)
 {
-        unsigned index;
+        /*
+         * PT_PAGE_TABLE_LEVEL always terminates.  The RHS has bit 7 set
+         * iff level <= PT_PAGE_TABLE_LEVEL, which for our purpose means
+         * level == PT_PAGE_TABLE_LEVEL; set PT_PAGE_SIZE_MASK in gpte then.
+         */
+        gpte |= level - PT_PAGE_TABLE_LEVEL - 1;
 
-        index = level - 1;
-        index |= (gpte & PT_PAGE_SIZE_MASK) >> (PT_PAGE_SIZE_SHIFT - 2);
-        return mmu->last_pte_bitmap & (1 << index);
+        /*
+         * The RHS has bit 7 set iff level < mmu->last_nonleaf_level.
+         * If it is clear, there are no large pages at this level, so clear
+         * PT_PAGE_SIZE_MASK in gpte if that is the case.
+         */
+        gpte &= level - mmu->last_nonleaf_level;
+
+        return gpte & PT_PAGE_SIZE_MASK;
 }
 
 #define PTTYPE_EPT 18 /* arbitrary */
@@ -3910,22 +3921,13 @@ static void update_permission_bitmask(struct kvm_vcpu *vcpu,
         }
 }
 
-static void update_last_pte_bitmap(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
+static void update_last_nonleaf_level(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
 {
-        u8 map;
-        unsigned level, root_level = mmu->root_level;
-        const unsigned ps_set_index = 1 << 2;  /* bit 2 of index: ps */
-
-        if (root_level == PT32E_ROOT_LEVEL)
-                --root_level;
-        /* PT_PAGE_TABLE_LEVEL always terminates */
-        map = 1 | (1 << ps_set_index);
-        for (level = PT_DIRECTORY_LEVEL; level <= root_level; ++level) {
-                if (level <= PT_PDPE_LEVEL
-                    && (mmu->root_level >= PT32E_ROOT_LEVEL || is_pse(vcpu)))
-                        map |= 1 << (ps_set_index | (level - 1));
-        }
-        mmu->last_pte_bitmap = map;
+        unsigned root_level = mmu->root_level;
+
+        mmu->last_nonleaf_level = root_level;
+        if (root_level == PT32_ROOT_LEVEL && is_pse(vcpu))
+                mmu->last_nonleaf_level++;
 }
 
 static void paging64_init_context_common(struct kvm_vcpu *vcpu,
@@ -3937,7 +3939,7 @@ static void paging64_init_context_common(struct kvm_vcpu *vcpu,
 
         reset_rsvds_bits_mask(vcpu, context);
         update_permission_bitmask(vcpu, context, false);
-        update_last_pte_bitmap(vcpu, context);
+        update_last_nonleaf_level(vcpu, context);
 
         MMU_WARN_ON(!is_pae(vcpu));
         context->page_fault = paging64_page_fault;
@@ -3964,7 +3966,7 @@ static void paging32_init_context(struct kvm_vcpu *vcpu,
 
         reset_rsvds_bits_mask(vcpu, context);
         update_permission_bitmask(vcpu, context, false);
-        update_last_pte_bitmap(vcpu, context);
+        update_last_nonleaf_level(vcpu, context);
 
         context->page_fault = paging32_page_fault;
         context->gva_to_gpa = paging32_gva_to_gpa;
@@ -4022,7 +4024,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
         }
 
         update_permission_bitmask(vcpu, context, false);
-        update_last_pte_bitmap(vcpu, context);
+        update_last_nonleaf_level(vcpu, context);
         reset_tdp_shadow_zero_bits_mask(vcpu, context);
 }
 
@@ -4128,7 +4130,7 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
         }
 
         update_permission_bitmask(vcpu, g_context, false);
-        update_last_pte_bitmap(vcpu, g_context);
+        update_last_nonleaf_level(vcpu, g_context);
 }
 
 static void init_kvm_mmu(struct kvm_vcpu *vcpu)