KVM: MMU: make use of ->root_level in reset_rsvds_bits_mask

The reset_rsvds_bits_mask() function can use the guest walker's root level
number instead of using a separate 'level' variable.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 15 insertions, 16 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ff053ca32303..4cb164268846 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3185,15 +3185,14 @@ static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access,
 #undef PTTYPE
 
 static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
-                                  struct kvm_mmu *context,
-                                  int level)
+                                  struct kvm_mmu *context)
 {
         int maxphyaddr = cpuid_maxphyaddr(vcpu);
         u64 exb_bit_rsvd = 0;
 
         if (!context->nx)
                 exb_bit_rsvd = rsvd_bits(63, 63);
-        switch (level) {
+        switch (context->root_level) {
         case PT32_ROOT_LEVEL:
                 /* no rsvd bits for 2 level 4K page table entries */
                 context->rsvd_bits_mask[0][1] = 0;
@@ -3251,8 +3250,9 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu,
                                         int level)
 {
         context->nx = is_nx(vcpu);
+        context->root_level = level;
 
-        reset_rsvds_bits_mask(vcpu, context, level);
+        reset_rsvds_bits_mask(vcpu, context);
 
         ASSERT(is_pae(vcpu));
         context->new_cr3 = paging_new_cr3;
@@ -3262,7 +3262,6 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu,
         context->invlpg = paging64_invlpg;
         context->update_pte = paging64_update_pte;
         context->free = paging_free;
-        context->root_level = level;
         context->shadow_root_level = level;
         context->root_hpa = INVALID_PAGE;
         context->direct_map = false;
@@ -3279,8 +3278,9 @@ static int paging32_init_context(struct kvm_vcpu *vcpu,
                                  struct kvm_mmu *context)
 {
         context->nx = false;
+        context->root_level = PT32_ROOT_LEVEL;
 
-        reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL);
+        reset_rsvds_bits_mask(vcpu, context);
 
         context->new_cr3 = paging_new_cr3;
         context->page_fault = paging32_page_fault;
@@ -3289,7 +3289,6 @@ static int paging32_init_context(struct kvm_vcpu *vcpu,
         context->sync_page = paging32_sync_page;
         context->invlpg = paging32_invlpg;
         context->update_pte = paging32_update_pte;
-        context->root_level = PT32_ROOT_LEVEL;
         context->shadow_root_level = PT32E_ROOT_LEVEL;
         context->root_hpa = INVALID_PAGE;
         context->direct_map = false;
@@ -3327,19 +3326,19 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
                 context->root_level = 0;
         } else if (is_long_mode(vcpu)) {
                 context->nx = is_nx(vcpu);
-                reset_rsvds_bits_mask(vcpu, context, PT64_ROOT_LEVEL);
-                context->gva_to_gpa = paging64_gva_to_gpa;
                 context->root_level = PT64_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, context);
+                context->gva_to_gpa = paging64_gva_to_gpa;
         } else if (is_pae(vcpu)) {
                 context->nx = is_nx(vcpu);
-                reset_rsvds_bits_mask(vcpu, context, PT32E_ROOT_LEVEL);
-                context->gva_to_gpa = paging64_gva_to_gpa;
                 context->root_level = PT32E_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, context);
+                context->gva_to_gpa = paging64_gva_to_gpa;
         } else {
                 context->nx = false;
-                reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL);
-                context->gva_to_gpa = paging32_gva_to_gpa;
                 context->root_level = PT32_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, context);
+                context->gva_to_gpa = paging32_gva_to_gpa;
         }
 
         return 0;
@@ -3402,18 +3401,18 @@ static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
                 g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested;
         } else if (is_long_mode(vcpu)) {
                 g_context->nx = is_nx(vcpu);
-                reset_rsvds_bits_mask(vcpu, g_context, PT64_ROOT_LEVEL);
                 g_context->root_level = PT64_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, g_context);
                 g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
         } else if (is_pae(vcpu)) {
                 g_context->nx = is_nx(vcpu);
-                reset_rsvds_bits_mask(vcpu, g_context, PT32E_ROOT_LEVEL);
                 g_context->root_level = PT32E_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, g_context);
                 g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
         } else {
                 g_context->nx = false;
-                reset_rsvds_bits_mask(vcpu, g_context, PT32_ROOT_LEVEL);
                 g_context->root_level = PT32_ROOT_LEVEL;
+                reset_rsvds_bits_mask(vcpu, g_context);
                 g_context->gva_to_gpa = paging32_gva_to_gpa_nested;
         }