linux-kernel - [PATCH 15/16] KVM: MMU: change disallowed_hugepage_adjust() arguments to kvm_page

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Date:   Sat,  7 Aug 2021 09:49:35 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, David Matlack <dmatlack@...gle.com>,
        seanjc@...gle.com, peterx@...hat.com
Subject: [PATCH 15/16] KVM: MMU: change disallowed_hugepage_adjust() arguments to kvm_page_fault

Pass struct kvm_page_fault to disallowed_hugepage_adjust() instead of
extracting the arguments from the struct.  Tweak a bit the conditions
to avoid long lines.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu/mmu.c          | 19 ++++++++-----------
 arch/x86/kvm/mmu/mmu_internal.h |  3 +--
 arch/x86/kvm/mmu/paging_tmpl.h  |  3 +--
 arch/x86/kvm/mmu/tdp_mmu.c      |  3 +--
 4 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 6df7da9d1d77..a41325f452f4 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2921,12 +2921,10 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
 	fault->pfn &= ~mask;
 }
 
-void disallowed_hugepage_adjust(u64 spte, gfn_t gfn, int cur_level,
-				kvm_pfn_t *pfnp, u8 *goal_levelp)
+void disallowed_hugepage_adjust(struct kvm_page_fault *fault, u64 spte, int cur_level)
 {
-	int level = *goal_levelp;
-
-	if (cur_level == level && level > PG_LEVEL_4K &&
+	if (cur_level > PG_LEVEL_4K &&
+	    cur_level == fault->goal_level &&
 	    is_shadow_present_pte(spte) &&
 	    !is_large_pte(spte)) {
 		/*
@@ -2936,10 +2934,10 @@ void disallowed_hugepage_adjust(u64 spte, gfn_t gfn, int cur_level,
 		 * patching back for them into pfn the next 9 bits of
 		 * the address.
 		 */
-		u64 page_mask = KVM_PAGES_PER_HPAGE(level) -
-				KVM_PAGES_PER_HPAGE(level - 1);
-		*pfnp |= gfn & page_mask;
-		(*goal_levelp)--;
+		u64 page_mask = KVM_PAGES_PER_HPAGE(cur_level) -
+				KVM_PAGES_PER_HPAGE(cur_level - 1);
+		fault->pfn |= fault->gfn & page_mask;
+		fault->goal_level--;
 	}
 }
 
@@ -2959,8 +2957,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 		 * large page, as the leaf could be executable.
 		 */
 		if (fault->nx_huge_page_workaround_enabled)
-			disallowed_hugepage_adjust(*it.sptep, fault->gfn, it.level,
-						   &fault->pfn, &fault->goal_level);
+			disallowed_hugepage_adjust(fault, *it.sptep, it.level);
 
 		base_gfn = fault->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
 		if (it.level == fault->goal_level)
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index f84e0e90e442..c80d89242c45 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -155,8 +155,7 @@ int kvm_mmu_max_mapping_level(struct kvm *kvm,
 			      const struct kvm_memory_slot *slot, gfn_t gfn,
 			      kvm_pfn_t pfn, int max_level);
 void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
-void disallowed_hugepage_adjust(u64 spte, gfn_t gfn, int cur_level,
-				kvm_pfn_t *pfnp, u8 *goal_levelp);
+void disallowed_hugepage_adjust(struct kvm_page_fault *fault, u64 spte, int cur_level);
 
 void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
 
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index add1b41b0f1a..3f82f469abdf 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -729,8 +729,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 		 * large page, as the leaf could be executable.
 		 */
 		if (fault->nx_huge_page_workaround_enabled)
-			disallowed_hugepage_adjust(*it.sptep, fault->gfn, it.level,
-						   &fault->pfn, &fault->goal_level);
+			disallowed_hugepage_adjust(fault, *it.sptep, it.level);
 
 		base_gfn = fault->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
 		if (it.level == fault->goal_level)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index f0a9009dff96..803da0334933 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1010,8 +1010,7 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
 
 	tdp_mmu_for_each_pte(iter, mmu, fault->gfn, fault->gfn + 1) {
 		if (fault->nx_huge_page_workaround_enabled)
-			disallowed_hugepage_adjust(iter.old_spte, fault->gfn,
-						   iter.level, &fault->pfn, &fault->goal_level);
+			disallowed_hugepage_adjust(fault, iter.old_spte, iter.level);
 
 		if (iter.level == fault->goal_level)
 			break;
-- 
2.27.0