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| author | Song Gao <gaosong@loongson.cn> | 2024-09-12 20:53:40 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-09-12 20:53:40 +0800 |
| commit | f4e40ea9f78fed585e953bf38575e47d24922e1a (patch) | |
| tree | 276a9131b25c79f8b8f1710c6ac4f145e2b710f4 /arch/loongarch/include/uapi | |
| parent | LoongArch: KVM: Add vm migration support for LBT registers (diff) | |
| download | linux-f4e40ea9f78fed585e953bf38575e47d24922e1a.tar.gz linux-f4e40ea9f78fed585e953bf38575e47d24922e1a.zip | |
LoongArch: KVM: Add PMU support for guest
On LoongArch, the host and guest have their own PMU CSRs registers and
they share PMU hardware resources. A set of PMU CSRs consists of a CTRL
register and a CNTR register. We can set which PMU CSRs are used by the
guest by writing to the GCFG register [24:26] bits.
On KVM side:
- Save the host PMU CSRs into structure kvm_context.
- If the host supports the PMU feature.
- When entering guest mode, save the host PMU CSRs and restore the guest PMU CSRs.
- When exiting guest mode, save the guest PMU CSRs and restore the host PMU CSRs.
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/uapi')
| -rw-r--r-- | arch/loongarch/include/uapi/asm/kvm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h index 003fb766c93f..06778dd37ad1 100644 --- a/arch/loongarch/include/uapi/asm/kvm.h +++ b/arch/loongarch/include/uapi/asm/kvm.h @@ -98,6 +98,7 @@ struct kvm_fpu { #define KVM_LOONGARCH_VM_FEAT_X86BT 2 #define KVM_LOONGARCH_VM_FEAT_ARMBT 3 #define KVM_LOONGARCH_VM_FEAT_MIPSBT 4 +#define KVM_LOONGARCH_VM_FEAT_PMU 5 /* Device Control API on vcpu fd */ #define KVM_LOONGARCH_VCPU_CPUCFG 0 |