LoongArch: KVM: Remove SW timer switch when vcpu is halt polling

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With halt-polling supported, there is checking for pending events or
interrupts when vcpu executes idle instruction. Pending interrupts
include injected SW interrupts and passthrough HW interrupts, such as
HW timer interrupts, since HW timer works still even if vcpu exists from
VM mode.

Since HW timer pending interrupt can be set directly with CSR status
register, and pending HW timer interrupt checking is used in vcpu block
checking function, it is not necessary to switch to SW timer during
halt-polling. This patch adds preemption disabling in function
kvm_cpu_has_pending_timer(), and removes SW timer switching in idle
instruction emulation function.

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 10:48:27 +08:00 • committed by Huacai Chen

parent 7ab6fb505b

commit 1612673201

3 changed files with 19 additions and 15 deletions

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13

arch/loongarch/kvm/exit.c

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12

arch/loongarch/kvm/timer.c

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9

arch/loongarch/kvm/vcpu.c

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