On 2015/12/8 22:10, Marc Zyngier wrote:
On 08/12/15 13:53, Will Deacon wrote:
On Tue, Dec 08, 2015 at 01:37:14PM +0000, Marc Zyngier wrote:
On 08/12/15 12:47, Shannon Zhao wrote:
From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Here we plan to support virtual PMU for guest by full software
emulation, so define some basic structs and functions preparing for
futher steps. Define struct kvm_pmc for performance monitor counter and
struct kvm_pmu for performance monitor unit for each vcpu. According to
ARMv8 spec, the PMU contains at most 32(ARMV8_MAX_COUNTERS) counters.
Since this only supports ARM64 (or PMUv3), add a separate config symbol
for it.
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_host.h | 2 ++
arch/arm64/kvm/Kconfig | 8 ++++++++
include/kvm/arm_pmu.h | 40 +++++++++++++++++++++++++++++++++++++++
3 files changed, 50 insertions(+)
create mode 100644 include/kvm/arm_pmu.h
[...]
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index a5272c0..66da9a2 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -36,6 +36,7 @@ config KVM
select HAVE_KVM_EVENTFD
select HAVE_KVM_IRQFD
select KVM_ARM_VGIC_V3
+ select KVM_ARM_PMU
What if HW_PERF_EVENTS is not selected? Also, selecting HW_PERF_EVENTS
is not enough, and you probably need PERF_EVENTS as well, So this should
probably read:
select KVM_ARM_PMU if (HW_PERF_EVENTS && PERF_EVENTS)
HW_PERF_EVENTS depends on ARM_PMU which in turn depends on PERF_EVENTS.
Yeah, this is the reason why I choose HW_PERF_EVENTS.
in which case, let's make it:
select KVM_ARM_PMU if HW_PERF_EVENTS
Sure, will do.
which should give us the minimal chain. I hate the kernel config
language! ;-)
M.
--
Shannon
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