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| author | Heinz Graalfs <graalfs@linux.vnet.ibm.com> | 2013-06-12 13:54:56 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-06-17 17:10:23 +0200 |
| commit | b764bb1c50c279b95a486d338418f7fda74fff71 (patch) | |
| tree | 3437841e26cc513f55f6366aebf533f57bbaea6e /arch/s390/kernel/entry64.S | |
| parent | KVM: s390: Use common waitqueue (diff) | |
| download | linux-b764bb1c50c279b95a486d338418f7fda74fff71.tar.xz linux-b764bb1c50c279b95a486d338418f7fda74fff71.zip | |
KVM: s390,perf: Detect if perf samples belong to KVM host or guest
This patch is based on an original patch of David Hildenbrand.
The perf core implementation calls architecture specific code in order
to ask for specific information for a particular sample:
perf_instruction_pointer()
When perf core code asks for the instruction pointer, architecture
specific code must detect if a KVM guest was running when the sample
was taken. A sample can be associated with a KVM guest when the PSW
supervisor state bit is set and the PSW instruction pointer part
contains the address of 'sie_exit'.
A KVM guest's instruction pointer information is then retrieved via
gpsw entry pointed to by the sie control-block.
perf_misc_flags()
perf code code calls this function in order to associate the kernel
vs. user state infomation with a particular sample. Architecture
specific code must also first detectif a KVM guest was running
at the time the sample was taken.
Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 51d99acc16fd..b094ced7a182 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -964,6 +964,7 @@ sie_done: # See also HANDLE_SIE_INTERCEPT rewind_pad: nop 0 + .globl sie_exit sie_exit: lg %r14,__SF_EMPTY+8(%r15) # load guest register save area stmg %r0,%r13,0(%r14) # save guest gprs 0-13 |