KVM: MMU: change mmu->page_fault() arguments to kvm_page_fault

Pass struct kvm_page_fault to mmu->page_fault() instead of
extracting the arguments from the struct.  FNAME(page_fault) can use
the precomputed bools from the error code.

Suggested-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 19 insertions, 18 deletions

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 376e90f4f413..3ca4b1c69e03 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4012,13 +4012,14 @@ out_unlock:
 	return r;
 }
 
-static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa,
-				u32 error_code, bool prefault)
+static int nonpaging_page_fault(struct kvm_vcpu *vcpu,
+				struct kvm_page_fault *fault)
 {
 	pgprintk("%s: gva %lx error %x\n", __func__, gpa, error_code);
 
 	/* This path builds a PAE pagetable, we can map 2mb pages at maximum. */
-	return direct_page_fault(vcpu, gpa, error_code, prefault,
+	return direct_page_fault(vcpu, fault->addr,
+				 fault->error_code, fault->prefault,
 				 PG_LEVEL_2M, false);
 }
 
@@ -4055,10 +4056,10 @@ int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
 }
 EXPORT_SYMBOL_GPL(kvm_handle_page_fault);
 
-int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
-		       bool prefault)
+int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 {
 	int max_level;
+	gpa_t gpa = fault->addr;
 
 	for (max_level = KVM_MAX_HUGEPAGE_LEVEL;
 	     max_level > PG_LEVEL_4K;
@@ -4070,8 +4071,8 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 			break;
 	}
 
-	return direct_page_fault(vcpu, gpa, error_code, prefault,
-				 max_level, true);
+	return direct_page_fault(vcpu, gpa, fault->error_code,
+				 fault->prefault, max_level, true);
 }
 
 static void nonpaging_init_context(struct kvm_mmu *context)
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index b908d2ff6d4c..8eee1200117a 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -833,11 +833,10 @@ FNAME(is_self_change_mapping)(struct kvm_vcpu *vcpu,
  *  Returns: 1 if we need to emulate the instruction, 0 otherwise, or
  *           a negative value on error.
  */
-static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
-			     bool prefault)
+static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 {
-	bool write_fault = error_code & PFERR_WRITE_MASK;
-	bool user_fault = error_code & PFERR_USER_MASK;
+	gpa_t addr = fault->addr;
+	u32 error_code = fault->error_code;
 	struct guest_walker walker;
 	int r;
 	kvm_pfn_t pfn;
@@ -847,6 +846,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	int max_level;
 
 	pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
+	WARN_ON_ONCE(fault->is_tdp);
 
 	/*
 	 * If PFEC.RSVD is set, this is a shadow page fault.
@@ -864,7 +864,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	 */
 	if (!r) {
 		pgprintk("%s: guest page fault\n", __func__);
-		if (!prefault)
+		if (!fault->prefault)
 			kvm_inject_emulated_page_fault(vcpu, &walker.fault);
 
 		return RET_PF_RETRY;
@@ -882,7 +882,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	vcpu->arch.write_fault_to_shadow_pgtable = false;
 
 	is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu,
-	      &walker, user_fault, &vcpu->arch.write_fault_to_shadow_pgtable);
+	      &walker, fault->user, &vcpu->arch.write_fault_to_shadow_pgtable);
 
 	if (is_self_change_mapping)
 		max_level = PG_LEVEL_4K;
@@ -892,8 +892,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
 
-	if (kvm_faultin_pfn(vcpu, prefault, walker.gfn, addr, &pfn, &hva,
-			 write_fault, &map_writable, &r))
+	if (kvm_faultin_pfn(vcpu, fault->prefault, walker.gfn, addr, &pfn, &hva,
+			    fault->write, &map_writable, &r))
 		return r;
 
 	if (handle_abnormal_pfn(vcpu, addr, walker.gfn, pfn, walker.pte_access, &r))
@@ -903,8 +903,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	 * Do not change pte_access if the pfn is a mmio page, otherwise
 	 * we will cache the incorrect access into mmio spte.
 	 */
-	if (write_fault && !(walker.pte_access & ACC_WRITE_MASK) &&
-	    !is_cr0_wp(vcpu->arch.mmu) && !user_fault && !is_noslot_pfn(pfn)) {
+	if (fault->write && !(walker.pte_access & ACC_WRITE_MASK) &&
+	    !is_cr0_wp(vcpu->arch.mmu) && !fault->user && !is_noslot_pfn(pfn)) {
 		walker.pte_access |= ACC_WRITE_MASK;
 		walker.pte_access &= ~ACC_USER_MASK;
 
@@ -928,7 +928,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	if (r)
 		goto out_unlock;
 	r = FNAME(fetch)(vcpu, addr, &walker, error_code, max_level, pfn,
-			 map_writable, prefault);
+			 map_writable, fault->prefault);
 	kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
 
 out_unlock: