[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v8 17/16] x86/vm_event: add response flag to reset vmtrace buffer
From: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx> Allow resetting the vmtrace buffer in response to a vm_event. This can be used to optimize a use-case where detecting a looped vmtrace buffer is important. Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx> --- This is a last minute addition to the series "acquire_resource size and external IPT monitoring" posted by Andrew, new in v8. --- xen/arch/x86/vm_event.c | 7 +++++++ xen/common/vm_event.c | 3 +++ xen/include/asm-arm/vm_event.h | 6 ++++++ xen/include/asm-x86/vm_event.h | 2 ++ xen/include/public/vm_event.h | 4 ++++ 5 files changed, 22 insertions(+) diff --git a/xen/arch/x86/vm_event.c b/xen/arch/x86/vm_event.c index 36272e9316..8f73a73e2e 100644 --- a/xen/arch/x86/vm_event.c +++ b/xen/arch/x86/vm_event.c @@ -300,6 +300,13 @@ void vm_event_emulate_check(struct vcpu *v, vm_event_response_t *rsp) }; } +void vm_event_reset_vmtrace(struct vcpu *v) +{ +#ifdef CONFIG_HVM + hvm_vmtrace_reset(v); +#endif +} + /* * Local variables: * mode: C diff --git a/xen/common/vm_event.c b/xen/common/vm_event.c index 127f2d58f1..44d542f23e 100644 --- a/xen/common/vm_event.c +++ b/xen/common/vm_event.c @@ -424,6 +424,9 @@ static int vm_event_resume(struct domain *d, struct vm_event_domain *ved) if ( rsp.flags & VM_EVENT_FLAG_GET_NEXT_INTERRUPT ) vm_event_monitor_next_interrupt(v); + if ( rsp.flags & VM_EVENT_FLAG_RESET_VMTRACE ) + vm_event_reset_vmtrace(v); + if ( rsp.flags & VM_EVENT_FLAG_VCPU_PAUSED ) vm_event_vcpu_unpause(v); } diff --git a/xen/include/asm-arm/vm_event.h b/xen/include/asm-arm/vm_event.h index 14d1d341cc..abe7db1970 100644 --- a/xen/include/asm-arm/vm_event.h +++ b/xen/include/asm-arm/vm_event.h @@ -58,4 +58,10 @@ void vm_event_sync_event(struct vcpu *v, bool value) /* Not supported on ARM. */ } +static inline +void vm_event_reset_vmtrace(struct vcpu *v) +{ + /* Not supported on ARM. */ +} + #endif /* __ASM_ARM_VM_EVENT_H__ */ diff --git a/xen/include/asm-x86/vm_event.h b/xen/include/asm-x86/vm_event.h index 785e741fba..0756124075 100644 --- a/xen/include/asm-x86/vm_event.h +++ b/xen/include/asm-x86/vm_event.h @@ -54,4 +54,6 @@ void vm_event_emulate_check(struct vcpu *v, vm_event_response_t *rsp); void vm_event_sync_event(struct vcpu *v, bool value); +void vm_event_reset_vmtrace(struct vcpu *v); + #endif /* __ASM_X86_VM_EVENT_H__ */ diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h index 147dc3ea73..36135ba4f1 100644 --- a/xen/include/public/vm_event.h +++ b/xen/include/public/vm_event.h @@ -123,6 +123,10 @@ * Set if the event comes from a nested VM and thus npt_base is valid. */ #define VM_EVENT_FLAG_NESTED_P2M (1 << 12) +/* + * Reset the vmtrace buffer (if vmtrace is enabled) + */ +#define VM_EVENT_FLAG_RESET_VMTRACE (1 << 13) /* * Reasons for the vm event request -- 2.27.0
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