linux-kernel - [RFC 19/33] KVM: x86: Decouple kvm_range_has_memory_attributes() from struct kvm's mem_attr

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Message-ID: <20231108111806.92604-20-nsaenz@amazon.com>
Date:   Wed, 8 Nov 2023 11:17:52 +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 19/33] KVM: x86: Decouple kvm_range_has_memory_attributes() from struct kvm's mem_attr_array

Decouple kvm_range_has_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   | 3 ++-
 include/linux/kvm_host.h | 4 ++--
 virt/kvm/kvm_main.c      | 9 +++++----
 3 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 96421234ca88..4ace2f8660b0 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -7297,7 +7297,8 @@ static bool hugepage_has_attrs(struct kvm *kvm, struct kvm_memory_slot *slot,
 	const unsigned long end = start + KVM_PAGES_PER_HPAGE(level);
 
 	if (level == PG_LEVEL_2M)
-		return kvm_range_has_memory_attributes(kvm, start, end, attrs);
+		return kvm_range_has_memory_attributes(&kvm->mem_attr_array,
+						       start, end, attrs);
 
 	for (gfn = start; gfn < end; gfn += KVM_PAGES_PER_HPAGE(level - 1)) {
 		if (hugepage_test_mixed(slot, gfn, level - 1) ||
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4242588e3dfb..32cf05637647 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2391,8 +2391,8 @@ kvm_get_memory_attributes(struct xarray *mem_attr_array, gfn_t 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,
-				     unsigned long attrs);
+bool kvm_range_has_memory_attributes(struct xarray *mem_attr_array, gfn_t start,
+				     gfn_t end, unsigned long attrs);
 bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
 					struct kvm_gfn_range *range);
 bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fde004a0ac46..6bb23eaf7aa6 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2440,10 +2440,10 @@ static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm,
  * Returns true if _all_ gfns in the range [@start, @end) have attributes
  * matching @attrs.
  */
-bool kvm_range_has_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
-				     unsigned long attrs)
+bool kvm_range_has_memory_attributes(struct xarray *mem_attr_array, gfn_t start,
+				     gfn_t end, unsigned long attrs)
 {
-	XA_STATE(xas, &kvm->mem_attr_array, start);
+	XA_STATE(xas, mem_attr_array, start);
 	unsigned long index;
 	bool has_attrs;
 	void *entry;
@@ -2582,7 +2582,8 @@ static int kvm_vm_set_mem_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
 	mutex_lock(&kvm->slots_lock);
 
 	/* Nothing to do if the entire range as the desired attributes. */
-	if (kvm_range_has_memory_attributes(kvm, start, end, attributes))
+	if (kvm_range_has_memory_attributes(&kvm->mem_attr_array, start, end,
+					    attributes))
 		goto out_unlock;
 
 	/*
-- 
2.40.1