linux-kernel - [PATCH v3 08/31] KVM: MMU: change __direct_map() arguments to kvm_page

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Date:   Fri, 24 Sep 2021 12:31:29 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     dmatlack@...gle.com, seanjc@...gle.com,
        Isaku Yamahata <isaku.yamahata@...el.com>
Subject: [PATCH v3 08/31] KVM: MMU: change __direct_map() arguments to kvm_page_fault

Pass struct kvm_page_fault to __direct_map() instead of
extracting the arguments from the struct.

Suggested-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/mmu.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6821d05c0557..c84e978d76b0 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2982,34 +2982,29 @@ void disallowed_hugepage_adjust(u64 spte, gfn_t gfn, int cur_level,
 	}
 }
 
-static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
-			int map_writable, int max_level, kvm_pfn_t pfn,
-			bool prefault, bool is_tdp)
+static int __direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 {
 	bool nx_huge_page_workaround_enabled = is_nx_huge_page_enabled();
-	bool write = error_code & PFERR_WRITE_MASK;
-	bool exec = error_code & PFERR_FETCH_MASK;
-	bool huge_page_disallowed = exec && nx_huge_page_workaround_enabled;
+	bool huge_page_disallowed = fault->exec && nx_huge_page_workaround_enabled;
 	struct kvm_shadow_walk_iterator it;
 	struct kvm_mmu_page *sp;
 	int level, req_level, ret;
-	gfn_t gfn = gpa >> PAGE_SHIFT;
-	gfn_t base_gfn = gfn;
+	gfn_t base_gfn = fault->gfn;
 
-	level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn,
+	level = kvm_mmu_hugepage_adjust(vcpu, fault->gfn, fault->max_level, &fault->pfn,
 					huge_page_disallowed, &req_level);
 
-	trace_kvm_mmu_spte_requested(gpa, level, pfn);
-	for_each_shadow_entry(vcpu, gpa, it) {
+	trace_kvm_mmu_spte_requested(fault->addr, level, fault->pfn);
+	for_each_shadow_entry(vcpu, fault->addr, it) {
 		/*
 		 * We cannot overwrite existing page tables with an NX
 		 * large page, as the leaf could be executable.
 		 */
 		if (nx_huge_page_workaround_enabled)
-			disallowed_hugepage_adjust(*it.sptep, gfn, it.level,
-						   &pfn, &level);
+			disallowed_hugepage_adjust(*it.sptep, fault->gfn, it.level,
+						   &fault->pfn, &level);
 
-		base_gfn = gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
+		base_gfn = fault->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
 		if (it.level == level)
 			break;
 
@@ -3021,14 +3016,14 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 				      it.level - 1, true, ACC_ALL);
 
 		link_shadow_page(vcpu, it.sptep, sp);
-		if (is_tdp && huge_page_disallowed &&
+		if (fault->is_tdp && huge_page_disallowed &&
 		    req_level >= it.level)
 			account_huge_nx_page(vcpu->kvm, sp);
 	}
 
 	ret = mmu_set_spte(vcpu, it.sptep, ACC_ALL,
-			   write, level, base_gfn, pfn, prefault,
-			   map_writable);
+			   fault->write, level, base_gfn, fault->pfn,
+			   fault->prefault, fault->map_writable);
 	if (ret == RET_PF_SPURIOUS)
 		return ret;
 
@@ -3996,8 +3991,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
 		r = kvm_tdp_mmu_map(vcpu, gpa, error_code, fault->map_writable, fault->max_level,
 				    fault->pfn, fault->prefault);
 	else
-		r = __direct_map(vcpu, gpa, error_code, fault->map_writable, fault->max_level,
-				 fault->pfn, fault->prefault, fault->is_tdp);
+		r = __direct_map(vcpu, fault);
 
 out_unlock:
 	if (is_tdp_mmu_fault)
-- 
2.27.0