KVM: mmu: remove uninteresting MMU "free" callbacks

The free MMU callback has been a wrapper for mmu_free_roots since mmu_free_roots
itself was introduced (commit 17ac10a, [PATCH] KVM: MU: Special treatment
for shadow pae root pages, 2007-01-05), and has always been the same for all
MMU cases.  Remove the indirection as it is useless.

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

2 files changed, 4 insertions, 19 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 52110d0ceb13..671c6f0bea51 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -261,7 +261,6 @@ struct kvm_mmu {
                           bool prefault);
         void (*inject_page_fault)(struct kvm_vcpu *vcpu,
                                   struct x86_exception *fault);
-        void (*free)(struct kvm_vcpu *vcpu);
         gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
                             struct x86_exception *exception);
         gpa_t (*translate_gpa)(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access);
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index cf95cfe050a6..1c4d580ba347 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3424,18 +3424,12 @@ out_unlock:
         return 0;
 }
 
-static void nonpaging_free(struct kvm_vcpu *vcpu)
-{
-        mmu_free_roots(vcpu);
-}
-
 static int nonpaging_init_context(struct kvm_vcpu *vcpu,
                                   struct kvm_mmu *context)
 {
         context->new_cr3 = nonpaging_new_cr3;
         context->page_fault = nonpaging_page_fault;
         context->gva_to_gpa = nonpaging_gva_to_gpa;
-        context->free = nonpaging_free;
         context->sync_page = nonpaging_sync_page;
         context->invlpg = nonpaging_invlpg;
         context->update_pte = nonpaging_update_pte;
@@ -3471,11 +3465,6 @@ static void inject_page_fault(struct kvm_vcpu *vcpu,
         vcpu->arch.mmu.inject_page_fault(vcpu, fault);
 }
 
-static void paging_free(struct kvm_vcpu *vcpu)
-{
-        nonpaging_free(vcpu);
-}
-
 static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn,
                            unsigned access, int *nr_present)
 {
@@ -3683,7 +3672,6 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu,
         context->sync_page = paging64_sync_page;
         context->invlpg = paging64_invlpg;
         context->update_pte = paging64_update_pte;
-        context->free = paging_free;
         context->shadow_root_level = level;
         context->root_hpa = INVALID_PAGE;
         context->direct_map = false;
@@ -3709,7 +3697,6 @@ static int paging32_init_context(struct kvm_vcpu *vcpu,
         context->new_cr3 = paging_new_cr3;
         context->page_fault = paging32_page_fault;
         context->gva_to_gpa = paging32_gva_to_gpa;
-        context->free = paging_free;
         context->sync_page = paging32_sync_page;
         context->invlpg = paging32_invlpg;
         context->update_pte = paging32_update_pte;
@@ -3732,7 +3719,6 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
         context->base_role.word = 0;
         context->new_cr3 = nonpaging_new_cr3;
         context->page_fault = tdp_page_fault;
-        context->free = nonpaging_free;
         context->sync_page = nonpaging_sync_page;
         context->invlpg = nonpaging_invlpg;
         context->update_pte = nonpaging_update_pte;
@@ -3812,7 +3798,6 @@ int kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context,
         context->sync_page = ept_sync_page;
         context->invlpg = ept_invlpg;
         context->update_pte = ept_update_pte;
-        context->free = paging_free;
         context->root_level = context->shadow_root_level;
         context->root_hpa = INVALID_PAGE;
         context->direct_map = false;
@@ -3890,9 +3875,10 @@ static int init_kvm_mmu(struct kvm_vcpu *vcpu)
 static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
 {
         ASSERT(vcpu);
-        if (VALID_PAGE(vcpu->arch.mmu.root_hpa))
-                /* mmu.free() should set root_hpa = INVALID_PAGE */
-                vcpu->arch.mmu.free(vcpu);
+        if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) {
+                mmu_free_roots(vcpu);
+                WARN_ON(VALID_PAGE(vcpu->arch.mmu.root_hpa));
+        }
 }
 
 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)