From 1171903d899b1930f502b4c10a2a3565d6603c71 Mon Sep 17 00:00:00 2001 From: Ulrich Obergfell Date: Fri, 2 May 2014 17:57:47 +0200 Subject: [PATCH] KVM: x86: improve the usability of the 'kvm_pio' tracepoint This patch moves the 'kvm_pio' tracepoint to emulator_pio_in_emulated() and emulator_pio_out_emulated(), and it adds an argument (a pointer to the 'pio_data'). A single 8-bit or 16-bit or 32-bit data item is fetched from 'pio_data' (depending on 'size'), and the value is included in the trace record ('val'). If 'count' is greater than one, this is indicated by the string "(...)" in the trace output. Signed-off-by: Ulrich Obergfell Reviewed-by: Xiao Guangrong Signed-off-by: Paolo Bonzini --- arch/x86/kvm/trace.h | 20 ++++++++++++++++---- arch/x86/kvm/x86.c | 4 ++-- 2 files changed, 18 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index 545245d7cc63..33574c95220d 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -91,16 +91,21 @@ TRACE_EVENT(kvm_hv_hypercall, /* * Tracepoint for PIO. */ + +#define KVM_PIO_IN 0 +#define KVM_PIO_OUT 1 + TRACE_EVENT(kvm_pio, TP_PROTO(unsigned int rw, unsigned int port, unsigned int size, - unsigned int count), - TP_ARGS(rw, port, size, count), + unsigned int count, void *data), + TP_ARGS(rw, port, size, count, data), TP_STRUCT__entry( __field( unsigned int, rw ) __field( unsigned int, port ) __field( unsigned int, size ) __field( unsigned int, count ) + __field( unsigned int, val ) ), TP_fast_assign( @@ -108,11 +113,18 @@ TRACE_EVENT(kvm_pio, __entry->port = port; __entry->size = size; __entry->count = count; + if (size == 1) + __entry->val = *(unsigned char *)data; + else if (size == 2) + __entry->val = *(unsigned short *)data; + else + __entry->val = *(unsigned int *)data; ), - TP_printk("pio_%s at 0x%x size %d count %d", + TP_printk("pio_%s at 0x%x size %d count %d val 0x%x %s", __entry->rw ? "write" : "read", - __entry->port, __entry->size, __entry->count) + __entry->port, __entry->size, __entry->count, __entry->val, + __entry->count > 1 ? "(...)" : "") ); /* diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c5582c385bc0..de0931cb3f58 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4480,8 +4480,6 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, unsigned short port, void *val, unsigned int count, bool in) { - trace_kvm_pio(!in, port, size, count); - vcpu->arch.pio.port = port; vcpu->arch.pio.in = in; vcpu->arch.pio.count = count; @@ -4516,6 +4514,7 @@ static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, if (ret) { data_avail: memcpy(val, vcpu->arch.pio_data, size * count); + trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data); vcpu->arch.pio.count = 0; return 1; } @@ -4530,6 +4529,7 @@ static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); memcpy(vcpu->arch.pio_data, val, size * count); + trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data); return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); } -- 2.11.0