KVM: x86/mmu: Set mmu->sync_page as NULL for direct paging

mmu->sync_page for direct paging is never called.

And both mmu->sync_page and mm->invlpg only make sense in shadow paging.
Setting mmu->sync_page as NULL for direct paging makes it consistent
with mm->invlpg which is set NULL for the case.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Link: https://lore.kernel.org/r/20230216154115.710033-5-jiangshanlai@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 9d31724..7fd824c 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1789,12 +1789,6 @@ static void mark_unsync(u64 *spte)
        kvm_mmu_mark_parents_unsync(sp);
 }
 
-static int nonpaging_sync_page(struct kvm_vcpu *vcpu,
-                              struct kvm_mmu_page *sp)
-{
-       return -1;
-}
-
 #define KVM_PAGE_ARRAY_NR 16
 
 struct kvm_mmu_pages {
@@ -4510,7 +4504,7 @@ static void nonpaging_init_context(struct kvm_mmu *context)
 {
        context->page_fault = nonpaging_page_fault;
        context->gva_to_gpa = nonpaging_gva_to_gpa;
-       context->sync_page = nonpaging_sync_page;
+       context->sync_page = NULL;
        context->invlpg = NULL;
 }
 
@@ -5198,7 +5192,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
        context->cpu_role.as_u64 = cpu_role.as_u64;
        context->root_role.word = root_role.word;
        context->page_fault = kvm_tdp_page_fault;
-       context->sync_page = nonpaging_sync_page;
+       context->sync_page = NULL;
        context->invlpg = NULL;
        context->get_guest_pgd = get_cr3;
        context->get_pdptr = kvm_pdptr_read;