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

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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: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-03-18 16:48:08 +08:00 committed by Huacai Chen
parent 6a16e448e5
commit 2bf463d761
2 changed files with 27 additions and 1 deletions
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3
arch/loongarch/include/asm/kvm_host.h
View File

@ -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);

25
arch/loongarch/kvm/vcpu.c
View File

@ -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;