LoongArch: KVM: Add cpucfg area for kvm hypervisor

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Instruction cpucfg can be used to get processor features. And there
is a trap exception when it is executed in VM mode, and also it can be
used to provide cpu features to VM. On real hardware cpucfg area 0 - 20
is used by now. Here one specified area 0x40000000 -- 0x400000ff is used
for KVM hypervisor to provide PV features, and the area can be extended
for other hypervisors in future. This area will never be used for real
HW, it is only used by software.

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

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Bibo Mao 2024-05-06 22:00:47 +08:00 • committed by Huacai Chen

parent 372631bb62

commit 9753d30379

3 changed files with 50 additions and 17 deletions

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1

arch/loongarch/include/asm/inst.h

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11

arch/loongarch/include/asm/loongarch.h

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55

arch/loongarch/kvm/exit.c

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