Commit 2bf463d7 authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
Browse files

LoongArch: KVM: Implement arch-specific functions for guest perf 



Three architecture specific functions are added for the guest perf
feature, they are kvm_arch_vcpu_in_kernel(), kvm_arch_vcpu_get_ip()
and kvm_arch_pmi_in_guest().

Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 6a16e448

arch/loongarch/include/asm/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/kvm.h>

#include <linux/kvm_types.h>

#include <linux/mutex.h>

#include <linux/perf_event.h>

#include <linux/spinlock.h>

#include <linux/threads.h>

#include <linux/types.h>
@@ -292,6 +293,8 @@ static inline int kvm_get_pmu_num(struct kvm_vcpu_arch *arch) 
	return (arch->cpucfg[6] & CPUCFG6_PMNUM) >> CPUCFG6_PMNUM_SHIFT;

}



bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu);



/* Debug: dump vcpu state */

int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);

arch/loongarch/kvm/vcpu.c

+24 −1
Original line number Diff line number Diff line
@@ -361,9 +361,32 @@ int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 


bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)

{

	return false;

	unsigned long val;



	preempt_disable();

	val = gcsr_read(LOONGARCH_CSR_CRMD);

	preempt_enable();



	return (val & CSR_PRMD_PPLV) == PLV_KERN;

}



#ifdef CONFIG_GUEST_PERF_EVENTS

unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)

{

	return vcpu->arch.pc;

}



/*

 * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event,

 * arrived in guest context.  For LoongArch64, if PMU is not passthrough to VM,

 * any event that arrives while a vCPU is loaded is considered to be "in guest".

 */

bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)

{

	return (vcpu && !(vcpu->arch.aux_inuse & KVM_LARCH_PMU));

}

#endif



bool kvm_arch_vcpu_preempted_in_kernel(struct kvm_vcpu *vcpu)

{

	return false;