linux-kernel - [RFC 23/33] KVM: Expose memory attribute helper functions unanimously

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Message-ID: <20231108111806.92604-24-nsaenz@amazon.com>
Date:   Wed, 8 Nov 2023 11:17:56 +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 23/33] KVM: Expose memory attribute helper functions unanimously

Expose memory attribute helper functions even when
CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES is disabled. Other KVM features,
like Hyper-V VSM, make use of memory attributes but don't rely on the
KVM ioctl.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@...zon.com>
---
 arch/x86/kvm/mmu/mmu.c   |  2 +-
 include/linux/kvm_host.h |  2 +-
 virt/kvm/kvm_main.c      | 18 +++++++++---------
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c2bec2be2ba9..a76028aa8fb3 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -7250,7 +7250,6 @@ void kvm_mmu_pre_destroy_vm(struct kvm *kvm)
 		kthread_stop(kvm->arch.nx_huge_page_recovery_thread);
 }
 
-#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
 					struct kvm_gfn_range *range)
 {
@@ -7377,6 +7376,7 @@ bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
 	return false;
 }
 
+#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm,
 					    struct kvm_memory_slot *slot)
 {
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ad104794037f..45e3e261755d 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2387,7 +2387,6 @@ static inline void kvm_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
 		vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_PRIVATE;
 }
 
-#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 static inline unsigned long
 kvm_get_memory_attributes(struct xarray *mem_attr_array, gfn_t gfn)
 {
@@ -2404,6 +2403,7 @@ bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
 bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
 					 struct kvm_gfn_range *range);
 
+#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
 {
 	return IS_ENABLED(CONFIG_KVM_PRIVATE_MEM) &&
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 74c4c42b2126..b3f4b200f438 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2435,7 +2435,6 @@ static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm,
 }
 #endif /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */
 
-#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
 /*
  * Returns true if _all_ gfns in the range [@start, @end) have attributes
  * matching @attrs.
@@ -2472,14 +2471,6 @@ bool kvm_range_has_memory_attributes(struct xarray *mem_attr_array, gfn_t start,
 	return has_attrs;
 }
 
-static u64 kvm_supported_mem_attributes(struct kvm *kvm)
-{
-	if (!kvm || kvm_arch_has_private_mem(kvm))
-		return KVM_MEMORY_ATTRIBUTE_PRIVATE;
-
-	return 0;
-}
-
 static __always_inline void kvm_handle_gfn_range(struct kvm *kvm,
 						 struct kvm_mmu_notifier_range *range)
 {
@@ -2644,6 +2635,15 @@ int kvm_ioctl_set_mem_attributes(struct kvm *kvm, struct xarray *mem_attr_array,
 				      attrs->attributes);
 }
 
+#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
+static u64 kvm_supported_mem_attributes(struct kvm *kvm)
+{
+	if (!kvm || kvm_arch_has_private_mem(kvm))
+		return KVM_MEMORY_ATTRIBUTE_PRIVATE;
+
+	return 0;
+}
+
 static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm,
 					   struct kvm_memory_attributes *attrs)
 {
-- 
2.40.1