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Date: Thu, 1 Feb 2024 11:29:12 +0800 From: zhaotianrui <zhaotianrui@...ngson.cn> To: maobibo <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org> Cc: kvm@...r.kernel.org, loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org Subject: Re: [PATCH] LoongArch: KVM: Remove unnecessary CSR register saving during enter guest Reviewed-by: Tianrui Zhao <zhaotianrui@...ngson.cn> 在 2024/1/31 上午11:48, maobibo 写道: > slightly ping :) > > On 2024/1/12 上午11:50, Bibo Mao wrote: >> Some CSR registers like CRMD/PRMD are saved during enter VM mode. However >> they are not restored for actual use, saving for these CSR registers >> can be removed. >> >> Signed-off-by: Bibo Mao <maobibo@...ngson.cn> >> --- >> arch/loongarch/kvm/switch.S | 6 ------ >> 1 file changed, 6 deletions(-) >> >> diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S >> index 0ed9040307b7..905b90de50e8 100644 >> --- a/arch/loongarch/kvm/switch.S >> +++ b/arch/loongarch/kvm/switch.S >> @@ -213,12 +213,6 @@ SYM_FUNC_START(kvm_enter_guest) >> /* Save host GPRs */ >> kvm_save_host_gpr a2 >> - /* Save host CRMD, PRMD to stack */ >> - csrrd a3, LOONGARCH_CSR_CRMD >> - st.d a3, a2, PT_CRMD >> - csrrd a3, LOONGARCH_CSR_PRMD >> - st.d a3, a2, PT_PRMD >> - >> addi.d a2, a1, KVM_VCPU_ARCH >> st.d sp, a2, KVM_ARCH_HSP >> st.d tp, a2, KVM_ARCH_HTP >> >> base-commit: de927f6c0b07d9e698416c5b287c521b07694cac >>
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