This patches removes SW timer switch during vcpu block stage. VM uses HW timer rather than SW PV timer on LoongArch system, it can check pending HW timer interrupt status directly, rather than switch to SW timer and check injected SW timer interrupt. When SW timer is not used in vcpu halt-polling mode, the relative SW timer handling before entering guest can be removed also. Timer emulation is simpler than before, SW timer emuation is only used in vcpu thread context switch. --- Changes in v4: If vcpu is scheduled out since there is no pending event, and timer is fired during sched-out period. SW hrtimer is used to wake up vcpu thread in time, rather than inject pending timer irq. Changes in v3: Add kvm_arch_vcpu_runnable checking before kvm_vcpu_halt. Changes in v2: Add halt polling support for idle instruction emulation, using api kvm_vcpu_halt rather than kvm_vcpu_block in function kvm_emu_idle. --- Bibo Mao (3): LoongArch: KVM: Remove SW timer switch when vcpu is halt polling LoongArch: KVM: Allow to access HW timer CSR registers always LoongArch: KVM: Remove kvm_acquire_timer before entering guest arch/loongarch/include/asm/kvm_vcpu.h | 1 - arch/loongarch/kvm/exit.c | 13 +----- arch/loongarch/kvm/main.c | 1 - arch/loongarch/kvm/timer.c | 62 ++++++++++----------------- arch/loongarch/kvm/vcpu.c | 38 ++++------------ 5 files changed, 32 insertions(+), 83 deletions(-) base-commit: c42d9eeef8e5ba9292eda36fd8e3c11f35ee065c -- 2.39.3
