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SubjectRe: [PATCH v13 03/30] LoongArch: KVM: Implement kvm hardware enable, disable interface


在 2023/6/9 17:08, Tianrui Zhao 写道:
> Implement kvm hardware enable, disable interface, setting
> the guest config register to enable virtualization features
> when called the interface.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
> ---
> arch/loongarch/kvm/main.c | 64 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 64 insertions(+)
>
> diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
> index f98c1619725f..5ebae1ea7565 100644
> --- a/arch/loongarch/kvm/main.c
> +++ b/arch/loongarch/kvm/main.c
> @@ -195,6 +195,70 @@ static void _kvm_init_gcsr_flag(void)
> set_gcsr_sw_flag(LOONGARCH_CSR_PERFCNTR3);
> }
>
> +void kvm_init_vmcs(struct kvm *kvm)
> +{
> + kvm->arch.vmcs = vmcs;
> +}
> +
> +long kvm_arch_dev_ioctl(struct file *filp,
> + unsigned int ioctl, unsigned long arg)
> +{
> + return -ENOIOCTLCMD;
> +}
> +
> +#ifdef CONFIG_KVM_GENERIC_HARDWARE_ENABLING
Can we remove macro CONFIG_KVM_GENERIC_HARDWARE_ENABLING here since it
is always enabled? The other looks good to me.

Reviewed-by: Bibo Mao <maobibo@loongson.cn>

Regards
Bibo, Mao
> +int kvm_arch_hardware_enable(void)
> +{
> + unsigned long env, gcfg = 0;
> +
> + env = read_csr_gcfg();
> + /* First init gtlbc, gcfg, gstat, gintc. All guest use the same config */
> + clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
> + write_csr_gcfg(0);
> + write_csr_gstat(0);
> + write_csr_gintc(0);
> +
> + /*
> + * Enable virtualization features granting guest direct control of
> + * certain features:
> + * GCI=2: Trap on init or unimplement cache instruction.
> + * TORU=0: Trap on Root Unimplement.
> + * CACTRL=1: Root control cache.
> + * TOP=0: Trap on Previlege.
> + * TOE=0: Trap on Exception.
> + * TIT=0: Trap on Timer.
> + */
> + if (env & CSR_GCFG_GCIP_ALL)
> + gcfg |= CSR_GCFG_GCI_SECURE;
> + if (env & CSR_GCFG_MATC_ROOT)
> + gcfg |= CSR_GCFG_MATC_ROOT;
> +
> + gcfg |= CSR_GCFG_TIT;
> + write_csr_gcfg(gcfg);
> +
> + kvm_flush_tlb_all();
> +
> + /* Enable using TGID */
> + set_csr_gtlbc(CSR_GTLBC_USETGID);
> + kvm_debug("gtlbc:%llx gintc:%llx gstat:%llx gcfg:%llx",
> + read_csr_gtlbc(), read_csr_gintc(),
> + read_csr_gstat(), read_csr_gcfg());
> +
> + return 0;
> +}
> +
> +void kvm_arch_hardware_disable(void)
> +{
> + clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
> + write_csr_gcfg(0);
> + write_csr_gstat(0);
> + write_csr_gintc(0);
> +
> + /* Flush any remaining guest TLB entries */
> + kvm_flush_tlb_all();
> +}
> +#endif
> +
> static int kvm_loongarch_env_init(void)
> {
> struct kvm_context *context;

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