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Code Issues Releases Wiki Activity

KVM: arm64: Wrapper for getting pmu_events 

Eases migrating away from using hyp data and simplifies the code.

No functional change intended.

Reviewed-by: Oliver Upton <oupton@google.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220510095710.148178-2-tabba@google.com
This commit is contained in:
Fuad Tabba 2022-05-10 09:57:07 +00:00 committed by Marc Zyngier
parent b2d229d4dd
commit 3cb8a091a7
1 changed files with 26 additions and 16 deletions
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42
arch/arm64/kvm/pmu.c
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@ -25,21 +25,31 @@ static bool kvm_pmu_switch_needed(struct perf_event_attr *attr)
return (attr->exclude_host != attr->exclude_guest);
}
static struct kvm_pmu_events *kvm_get_pmu_events(void)
{
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
if (!ctx)
return NULL;
return &ctx->pmu_events;
}
/*
* Add events to track that we may want to switch at guest entry/exit
* time.
*/
void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
{
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
struct kvm_pmu_events *pmu = kvm_get_pmu_events();
if (!kvm_arm_support_pmu_v3() || !ctx || !kvm_pmu_switch_needed(attr))
if (!kvm_arm_support_pmu_v3() || !pmu || !kvm_pmu_switch_needed(attr))
return;
if (!attr->exclude_host)
ctx->pmu_events.events_host |= set;
pmu->events_host |= set;
if (!attr->exclude_guest)
ctx->pmu_events.events_guest |= set;
pmu->events_guest |= set;
}
/*
@ -47,13 +57,13 @@ void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
*/
void kvm_clr_pmu_events(u32 clr)
{
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
struct kvm_pmu_events *pmu = kvm_get_pmu_events();
if (!kvm_arm_support_pmu_v3() || !ctx)
if (!kvm_arm_support_pmu_v3() || !pmu)
return;
ctx->pmu_events.events_host &= ~clr;
ctx->pmu_events.events_guest &= ~clr;
pmu->events_host &= ~clr;
pmu->events_guest &= ~clr;
}
#define PMEVTYPER_READ_CASE(idx) \
@ -169,16 +179,16 @@ static void kvm_vcpu_pmu_disable_el0(unsigned long events)
*/
void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
u32 events_guest, events_host;
if (!kvm_arm_support_pmu_v3() || !has_vhe())
return;
preempt_disable();
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;
pmu = kvm_get_pmu_events();
events_guest = pmu->events_guest;
events_host = pmu->events_host;
kvm_vcpu_pmu_enable_el0(events_guest);
kvm_vcpu_pmu_disable_el0(events_host);
@ -190,15 +200,15 @@ void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
*/
void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
u32 events_guest, events_host;
if (!kvm_arm_support_pmu_v3() || !has_vhe())
return;
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;
pmu = kvm_get_pmu_events();
events_guest = pmu->events_guest;
events_host = pmu->events_host;
kvm_vcpu_pmu_enable_el0(events_host);
kvm_vcpu_pmu_disable_el0(events_guest);