[PATCH v13 03/85] KVM: Add kvm_release_page_unused() API to put pages that KVM never consumes
From: Sean Christopherson <seanjc@google.com>
Date: 2024-10-10 18:24:55
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). Reviewed-by: Alex Bennée <redacted> Tested-by: Alex Bennée <redacted> 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 ee186a1fbaad..ab4485b2bddc 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -1216,6 +1216,15 @@ 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);
--
2.47.0.rc1.288.g06298d1525-goog