search for: kvm_page_track_writ

...led when memory slot is being moved or removed * users can drop write-protection for the pages in that memory slot @@ -69,7 +71,7 @@ kvm_page_track_register_notifier(struct kvm *kvm, void kvm_page_track_unregister_notifier(struct kvm *kvm, struct kvm_page_track_notifier_node *n); -void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, - int bytes); +void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, gva_t gva, + const u8 *new, int bytes); void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot); #endif diff --git a/arch/x86/kvm/mmu/mmu.c b/...

...h/x86/include/asm/kvm_page_track.h index 00a66c4d4d3c..c10f0f65c77a 100644 --- a/arch/x86/include/asm/kvm_page_track.h +++ b/arch/x86/include/asm/kvm_page_track.h @@ -3,7 +3,10 @@ #define _ASM_X86_KVM_PAGE_TRACK_H enum kvm_page_track_mode { + KVM_PAGE_TRACK_PREREAD, + KVM_PAGE_TRACK_PREWRITE, KVM_PAGE_TRACK_WRITE, + KVM_PAGE_TRACK_PREEXEC, KVM_PAGE_TRACK_MAX, }; @@ -22,6 +25,33 @@ struct kvm_page_track_notifier_head { struct kvm_page_track_notifier_node { struct hlist_node node; + /* + * It is called when guest is reading the read-tracked page + * and the read emulation is about to happen. + *...

...int bytes if (gpa == UNMAPPED_GVA) return X86EMUL_PROPAGATE_FAULT; + if (!kvm_page_track_prewrite(vcpu, gpa, addr, data, towrite)) + return X86EMUL_RETRY_INSTR; ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); if (ret < 0) { r = X86EMUL_IO_NEEDED; goto out; } + kvm_page_track_write(vcpu, gpa, addr, data, towrite); bytes -= towrite; data += towrite;

This patch series is based on the VM introspection patches (https://lore.kernel.org/kvm/20200721210922.7646-1-alazar at bitdefender.com/), extending the introspection API with EPT Views and Virtualization Exceptions (#VE) support. The purpose of this series is to get an initial feedback and to see if we are on the right track, especially because the changes made to add the EPT views are not small

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place