linux-kernel - [RFC 18/33] KVM: x86: Decouple kvm_get_memory_attributes() from struct kvm's mem_attr

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Date:   Wed, 8 Nov 2023 11:17:51 +0000
From:   Nicolas Saenz Julienne <nsaenz@...zon.com>
To:     <kvm@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-hyperv@...r.kernel.org>,
        <pbonzini@...hat.com>, <seanjc@...gle.com>, <vkuznets@...hat.com>,
        <anelkz@...zon.com>, <graf@...zon.com>, <dwmw@...zon.co.uk>,
        <jgowans@...zon.com>, <corbert@....net>, <kys@...rosoft.com>,
        <haiyangz@...rosoft.com>, <decui@...rosoft.com>, <x86@...nel.org>,
        <linux-doc@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@...zon.com>
Subject: [RFC 18/33] KVM: x86: Decouple kvm_get_memory_attributes() from struct kvm's mem_attr_array

Decouple kvm_get_memory_attributes() from struct kvm's mem_attr_array to
allow other memory attribute sources to use the function.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@...zon.com>
---
 arch/x86/kvm/mmu/mmu.c   | 5 +++--
 include/linux/kvm_host.h | 8 +++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index a1fbb905258b..96421234ca88 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -7301,7 +7301,7 @@ static bool hugepage_has_attrs(struct kvm *kvm, struct kvm_memory_slot *slot,
 
 	for (gfn = start; gfn < end; gfn += KVM_PAGES_PER_HPAGE(level - 1)) {
 		if (hugepage_test_mixed(slot, gfn, level - 1) ||
-		    attrs != kvm_get_memory_attributes(kvm, gfn))
+		    attrs != kvm_get_memory_attributes(&kvm->mem_attr_array, gfn))
 			return false;
 	}
 	return true;
@@ -7401,7 +7401,8 @@ void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm,
 		 * be manually checked as the attributes may already be mixed.
 		 */
 		for (gfn = start; gfn < end; gfn += nr_pages) {
-			unsigned long attrs = kvm_get_memory_attributes(kvm, gfn);
+			unsigned long attrs =
+				kvm_get_memory_attributes(&kvm->mem_attr_array, gfn);
 
 			if (hugepage_has_attrs(kvm, slot, gfn, level, attrs))
 				hugepage_clear_mixed(slot, gfn, level);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 631fd532c97a..4242588e3dfb 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2385,9 +2385,10 @@ static inline void kvm_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
 }
 
 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
-static inline unsigned long kvm_get_memory_attributes(struct kvm *kvm, gfn_t gfn)
+static inline unsigned long
+kvm_get_memory_attributes(struct xarray *mem_attr_array, gfn_t gfn)
 {
-	return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));
+	return xa_to_value(xa_load(mem_attr_array, gfn));
 }
 
 bool kvm_range_has_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
@@ -2400,7 +2401,8 @@ bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
 static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
 {
 	return IS_ENABLED(CONFIG_KVM_PRIVATE_MEM) &&
-	       kvm_get_memory_attributes(kvm, gfn) & KVM_MEMORY_ATTRIBUTE_PRIVATE;
+	       kvm_get_memory_attributes(&kvm->mem_attr_array, gfn) &
+		       KVM_MEMORY_ATTRIBUTE_PRIVATE;
 }
 #else
 static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
-- 
2.40.1