KVM: x86/mmu: Make dirty log size hook (PML) a value, not a function

Store the vendor-specific dirty log size in a variable, there's no need
to wrap it in a function since the value is constant after
hardware_setup() runs.
Signed-off-by: NSean Christopherson <seanjc@google.com>
Message-Id: <20210213005015.1651772-9-seanjc@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm-x86-ops.h

@@ -97,7 +97,6 @@ KVM_X86_OP_NULL(slot_enable_log_dirty)
 KVM_X86_OP_NULL(slot_disable_log_dirty)
 KVM_X86_OP_NULL(flush_log_dirty)
 KVM_X86_OP_NULL(enable_log_dirty_pt_masked)
-KVM_X86_OP_NULL(cpu_dirty_log_size)
 KVM_X86_OP_NULL(pre_block)
 KVM_X86_OP_NULL(post_block)
 KVM_X86_OP_NULL(vcpu_blocking)

arch/x86/include/asm/kvm_host.h

@@ -1294,7 +1294,7 @@ struct kvm_x86_ops {
 	void (*enable_log_dirty_pt_masked)(struct kvm *kvm,
 					   struct kvm_memory_slot *slot,
 					   gfn_t offset, unsigned long mask);
-	int (*cpu_dirty_log_size)(void);
+	int cpu_dirty_log_size;
 
 	/* pmu operations of sub-arch */
 	const struct kvm_pmu_ops *pmu_ops;

arch/x86/kvm/mmu/mmu.c

@@ -1294,10 +1294,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
 
 int kvm_cpu_dirty_log_size(void)
 {
-	if (kvm_x86_ops.cpu_dirty_log_size)
-		return static_call(kvm_x86_cpu_dirty_log_size)();
-
-	return 0;
+	return kvm_x86_ops.cpu_dirty_log_size;
 }
 
 bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,

arch/x86/kvm/vmx/vmx.c

@@ -7642,11 +7642,6 @@ static bool vmx_check_apicv_inhibit_reasons(ulong bit)
 	return supported & BIT(bit);
 }
 
-static int vmx_cpu_dirty_log_size(void)
-{
-	return enable_pml ? PML_ENTITY_NUM : 0;
-}
-
 static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.hardware_unsetup = hardware_unsetup,
 
@@ -7750,6 +7745,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.slot_disable_log_dirty = vmx_slot_disable_log_dirty,
 	.flush_log_dirty = vmx_flush_log_dirty,
 	.enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked,
+	.cpu_dirty_log_size = PML_ENTITY_NUM,
 
 	.pre_block = vmx_pre_block,
 	.post_block = vmx_post_block,
@@ -7777,7 +7773,6 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 
 	.msr_filter_changed = vmx_msr_filter_changed,
 	.complete_emulated_msr = kvm_complete_insn_gp,
-	.cpu_dirty_log_size = vmx_cpu_dirty_log_size,
 
 	.vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,
 };
@@ -7899,7 +7894,7 @@ static __init int hardware_setup(void)
 		vmx_x86_ops.slot_disable_log_dirty = NULL;
 		vmx_x86_ops.flush_log_dirty = NULL;
 		vmx_x86_ops.enable_log_dirty_pt_masked = NULL;
-		vmx_x86_ops.cpu_dirty_log_size = NULL;
+		vmx_x86_ops.cpu_dirty_log_size = 0;
 	}
 
 	if (!cpu_has_vmx_preemption_timer())