path: root/virt/kvm/eventfd.c
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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2011-07-22 12:46:53 +0100
committerAvi Kivity <avi@redhat.com>2011-09-25 19:17:59 +0300
commit0d460ffc0956d2dbe12ca9f5f6aa0f8701ea9d73 (patch)
tree043ba67b92ac023b36bde109f15f5cff9d1c0091 /virt/kvm/eventfd.c
parente097e5ffd69cbd7be61466e2d54c145468d48073 (diff)
KVM: Use __print_symbolic() for vmexit tracepoints
The vmexit tracepoints format the exit_reason to make it human-readable. Since the exit_reason depends on the instruction set (vmx or svm), formatting is handled with ftrace_print_symbols_seq() by referring to the appropriate exit reason table. However, the ftrace_print_symbols_seq() function is not meant to be used directly in tracepoints since it does not export the formatting table which userspace tools like trace-cmd and perf use to format traces. In practice perf dies when formatting vmexit-related events and trace-cmd falls back to printing the numeric value (with extra formatting code in the kvm plugin to paper over this limitation). Other userspace consumers of vmexit-related tracepoints would be in similar trouble. To avoid significant changes to the kvm_exit tracepoint, this patch moves the vmx and svm exit reason tables into arch/x86/kvm/trace.h and selects the right table with __print_symbolic() depending on the instruction set. Note that __print_symbolic() is designed for exporting the formatting table to userspace and allows trace-cmd and perf to work. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/eventfd.c')
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