LoongArch: KVM: Remove kvm_acquire_timer() before entering guest

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Timer emulation method in VM is switch to SW timer, there are two
places where timer emulation is needed. One is during vcpu thread
context switch, the other is halt-polling with idle instruction
emulation. SW timer switching is removed during halt-polling mode,
so it is not necessary to disable SW timer before entering to guest.

This patch removes SW timer handling before entering guest mode, and
put it in HW timer restoring flow when vcpu thread is sched-in. With
this patch, vm timer emulation is simpler, there is SW/HW timer
switch only in vcpu thread context switch scenario.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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This commit is contained in:

Bibo Mao 2023-12-19 10:48:28 +08:00 • committed by Huacai Chen

parent 0d2abe6702

commit 1ab9c60994

3 changed files with 6 additions and 46 deletions

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1

arch/loongarch/include/asm/kvm_vcpu.h

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22

arch/loongarch/kvm/timer.c

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29

arch/loongarch/kvm/vcpu.c

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