[PATCH v12 11/84] KVM: Rename gfn_to_page_many_atomic() to kvm_prefetch_pages()
From: Sean Christopherson <seanjc@google.com>
Date: 2024-07-26 23:53:00
Also in:
kvm, kvm-riscv, kvmarm, linux-arm-kernel, linux-mips, linux-riscv, lkml, loongarch
Subsystem:
kernel virtual machine (kvm), kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Paolo Bonzini, Sean Christopherson, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Rename gfn_to_page_many_atomic() to kvm_prefetch_pages() to try and communicate its true purpose, as the "atomic" aspect is essentially a side effect of the fact that x86 uses the API while holding mmu_lock. E.g. even if mmu_lock weren't held, KVM wouldn't want to fault-in pages, as the goal is to opportunistically grab surrounding pages that have already been accessed and/or dirtied by the host, and to do so quickly. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/mmu/mmu.c | 2 +- arch/x86/kvm/mmu/paging_tmpl.h | 2 +- include/linux/kvm_host.h | 4 ++-- virt/kvm/kvm_main.c | 6 +++--- 4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b7642f1f993f..c1914f02c5e1 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c@@ -2912,7 +2912,7 @@ static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, if (!slot) return -1; - ret = gfn_to_page_many_atomic(slot, gfn, pages, end - start); + ret = kvm_prefetch_pages(slot, gfn, pages, end - start); if (ret <= 0) return -1;
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 6b215a932158..bc801d454f41 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h@@ -549,7 +549,7 @@ FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, if (!slot) return false; - if (gfn_to_page_many_atomic(slot, gfn, &page, 1) != 1) + if (kvm_prefetch_pages(slot, gfn, &page, 1) != 1) return false; mmu_set_spte(vcpu, slot, spte, pte_access, gfn, page_to_pfn(page), NULL);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c5d39a337aa3..79fed9fea638 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -1192,8 +1192,8 @@ void kvm_arch_flush_shadow_all(struct kvm *kvm); void kvm_arch_flush_shadow_memslot(struct kvm *kvm, struct kvm_memory_slot *slot); -int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, - struct page **pages, int nr_pages); +int kvm_prefetch_pages(struct kvm_memory_slot *slot, gfn_t gfn, + struct page **pages, int nr_pages); struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn); unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 656e931ac39e..803299778cf8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c@@ -3060,8 +3060,8 @@ kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) } EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); -int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, - struct page **pages, int nr_pages) +int kvm_prefetch_pages(struct kvm_memory_slot *slot, gfn_t gfn, + struct page **pages, int nr_pages) { unsigned long addr; gfn_t entry = 0;
@@ -3075,7 +3075,7 @@ int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, return get_user_pages_fast_only(addr, nr_pages, FOLL_WRITE, pages); } -EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); +EXPORT_SYMBOL_GPL(kvm_prefetch_pages); /* * Do not use this helper unless you are absolutely certain the gfn _must_ be
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2.46.0.rc1.232.g9752f9e123-goog