Merge tag 'powerpc-4.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux

[platform/kernel/linux-rpi.git] / arch / powerpc / kvm / Kconfig

diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index b3b3d9f..3caec2c 100644 (file)
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -110,6 +110,20 @@ config KVM_BOOK3S_64_PR
          processor, including emulating 32-bit processors on a 64-bit
          host.
 
+config KVM_BOOK3S_HV_EXIT_TIMING
+       bool "Detailed timing for hypervisor real-mode code"
+       depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
+       ---help---
+         Calculate time taken for each vcpu in the real-mode guest entry,
+         exit, and interrupt handling code, plus time spent in the guest
+         and in nap mode due to idle (cede) while other threads are still
+         in the guest.  The total, minimum and maximum times in nanoseconds
+         together with the number of executions are reported in debugfs in
+         kvm/vm#/vcpu#/timings.  The overhead is of the order of 30 - 40
+         ns per exit on POWER8.
+
+         If unsure, say N.
+
 config KVM_BOOKE_HV
        bool