From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/x86/include/asm/kvm_page_track.h | 62 +++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 arch/x86/include/asm/kvm_page_track.h (limited to 'arch/x86/include/asm/kvm_page_track.h') diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h new file mode 100644 index 0000000000..3d04074104 --- /dev/null +++ b/arch/x86/include/asm/kvm_page_track.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_KVM_PAGE_TRACK_H +#define _ASM_X86_KVM_PAGE_TRACK_H + +#include + +#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING +/* + * The notifier represented by @kvm_page_track_notifier_node is linked into + * the head which will be notified when guest is triggering the track event. + * + * Write access on the head is protected by kvm->mmu_lock, read access + * is protected by track_srcu. + */ +struct kvm_page_track_notifier_head { + struct srcu_struct track_srcu; + struct hlist_head track_notifier_list; +}; + +struct kvm_page_track_notifier_node { + struct hlist_node node; + + /* + * It is called when guest is writing the write-tracked page + * and write emulation is finished at that time. + * + * @gpa: the physical address written by guest. + * @new: the data was written to the address. + * @bytes: the written length. + * @node: this node + */ + void (*track_write)(gpa_t gpa, const u8 *new, int bytes, + struct kvm_page_track_notifier_node *node); + + /* + * Invoked when a memory region is removed from the guest. Or in KVM + * terms, when a memslot is deleted. + * + * @gfn: base gfn of the region being removed + * @nr_pages: number of pages in the to-be-removed region + * @node: this node + */ + void (*track_remove_region)(gfn_t gfn, unsigned long nr_pages, + struct kvm_page_track_notifier_node *node); +}; + +int kvm_page_track_register_notifier(struct kvm *kvm, + struct kvm_page_track_notifier_node *n); +void kvm_page_track_unregister_notifier(struct kvm *kvm, + struct kvm_page_track_notifier_node *n); + +int kvm_write_track_add_gfn(struct kvm *kvm, gfn_t gfn); +int kvm_write_track_remove_gfn(struct kvm *kvm, gfn_t gfn); +#else +/* + * Allow defining a node in a structure even if page tracking is disabled, e.g. + * to play nice with testing headers via direct inclusion from the command line. + */ +struct kvm_page_track_notifier_node {}; +#endif /* CONFIG_KVM_EXTERNAL_WRITE_TRACKING */ + +#endif -- cgit v1.2.3