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| author | Ulrich Obergfell <uobergfe@redhat.com> | 2014-05-02 17:57:47 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-05-05 22:42:05 +0200 |
| commit | 1171903d899b1930f502b4c10a2a3565d6603c71 (patch) | |
| tree | cdceb9525188eee17817b28b6eee5fc6f648cd32 /arch/x86/kvm/x86.c | |
| parent | 719d93cd5f5c5c8775b7a38192069e8e1d1ac46e (diff) | |
| download | lwn-1171903d899b1930f502b4c10a2a3565d6603c71.tar.gz lwn-1171903d899b1930f502b4c10a2a3565d6603c71.zip | |
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 <uobergfe@redhat.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 4 |
1 files changed, 2 insertions, 2 deletions
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); } |