search for: exception_bitmap

Running a heavily modified xen-unstable changset 19590:f80cf52a4fb6 with debugger_attached set, I was seeing the debug traps getting lost from the EXCEPTION_BITMAP in vmx_update_guest_cr() when transitioning from real to protected mode. In my codebase, I could fix this trivially by clearing the debug_state_latch and letting vmx_do_resume() reapply the setting. However, while it looks like a valid issue in the unmodified codebase, I''m not sure. So ma...

...= svm_get_idt, .set_idt = svm_set_idt, diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4b6edb68e9e0..7cfd25800d89 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7776,6 +7776,13 @@ static bool vmx_bp_intercepted(struct kvm_vcpu *vcpu) return (vmcs_read32(EXCEPTION_BITMAP) & (1u << BP_VECTOR)); } +static bool vmx_cr3_write_intercepted(struct kvm_vcpu *vcpu) +{ + struct vcpu_vmx *vmx = to_vmx(vcpu); + + return !!(exec_controls_get(vmx) & CPU_BASED_CR3_LOAD_EXITING); +} + static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { .cpu_has_kvm_suppor...

...x/vmx.c b/arch/x86/kvm/vmx/vmx.c index e3394c839dea..0d7ca70b310e 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7758,6 +7758,11 @@ static __exit void hardware_unsetup(void) free_kvm_area(); } +static bool vmx_bp_intercepted(struct kvm_vcpu *vcpu) +{ + return (vmcs_read32(EXCEPTION_BITMAP) & (1u << BP_VECTOR)); +} + static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { .cpu_has_kvm_support = cpu_has_kvm_support, .disabled_by_bios = vmx_disabled_by_bios, @@ -7781,6 +7786,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { .vcpu_load = vmx_vcpu_load,...

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

This patch series is a reworking of a series developed by Mukesh Rathor at Oracle. The entirety of the design and development was done by him; I have only reworked, reorganized, and simplified things in a way that I think makes more sense. The vast majority of the credit for this effort therefore goes to him. This version is labelled v13 because it is based on his most recent series, v11.

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