[PATCH v12 05/84] KVM: Add kvm_release_page_unused() API to put pages that KVM never consumes
From: Sean Christopherson <seanjc@google.com>
Date: 2024-07-26 23:52:48
Also in:
kvm, kvm-riscv, kvmarm, linux-arm-kernel, linux-mips, linux-riscv, lkml, loongarch
Subsystem:
kernel virtual machine (kvm), the rest · Maintainers:
Paolo Bonzini, Linus Torvalds
Add an API to release an unused page, i.e. to put a page without marking it accessed or dirty. The API will be used when KVM faults-in a page but bails before installing the guest mapping (and other similar flows). Signed-off-by: Sean Christopherson <seanjc@google.com> --- include/linux/kvm_host.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3d9617d1de41..c5d39a337aa3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -1201,6 +1201,15 @@ unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable); unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn); unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn, bool *writable); + +static inline void kvm_release_page_unused(struct page *page) +{ + if (!page) + return; + + put_page(page); +} + void kvm_release_page_clean(struct page *page); void kvm_release_page_dirty(struct page *page);
--
2.46.0.rc1.232.g9752f9e123-goog