summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm
diff options
context:
space:
mode:
authorGleb Natapov <gleb@redhat.com>2011-10-05 14:01:21 +0200
committerIngo Molnar <mingo@elte.hu>2011-10-10 06:56:42 +0200
commit144d31e6f1902a39bc95754d820d356722697850 (patch)
treea60b87261e4a73e10c594120e238f537b78137af /arch/x86/include/asm
parent011af857847a7ebe1f45342b29ff9f390515a4b8 (diff)
perf, intel: Use GO/HO bits in perf-ctr
Intel does not have guest/host-only bit in perf counters like AMD does. To support GO/HO bits KVM needs to switch EVENTSELn values (or PERF_GLOBAL_CTRL if available) at a guest entry. If a counter is configured to count only in a guest mode it stays disabled in a host, but VMX is configured to switch it to enabled value during guest entry. This patch adds GO/HO tracking to Intel perf code and provides interface for KVM to get a list of MSRs that need to be switched on a guest entry. Only cpus with architectural PMU (v1 or later) are supported with this patch. To my knowledge there is not p6 models with VMX but without architectural PMU and p4 with VMX are rare and the interface is general enough to support them if need arise. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1317816084-18026-7-git-send-email-gleb@redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r--arch/x86/include/asm/perf_event.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index ce2bfb33538..e47cb6167e8 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -162,7 +162,19 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs);
); \
}
+struct perf_guest_switch_msr {
+ unsigned msr;
+ u64 host, guest;
+};
+
+extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr);
#else
+static inline perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
+{
+ *nr = 0;
+ return NULL;
+}
+
static inline void perf_events_lapic_init(void) { }
#endif