Commit a5a22987 authored by Bibo Mao's avatar Bibo Mao Committed by Xianglai Li
Browse files

LoongArch: KVM: Remove unnecessary CSR register saving during enter guest 

mainline inclusion
from mainline-v6.9-rc1
commit b99f783106ea5b2f8c9d74f4d3b1e2f77af9ec6e
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IAZJDO


CVE: NA

--------------------------------

Some CSR registers like CRMD/PRMD are saved during enter VM mode now.
However they are not restored for actual use, so saving for these CSR
registers can be removed.

Reviewed-by: default avatarTianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: default avatarXianglai Li <lixianglai@loongson.cn>
parent df5218cc

arch/loongarch/kvm/switch.S

+0 −6
Original line number Diff line number Diff line
@@ -214,12 +214,6 @@ 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