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SubjectRe: [PATCH v4 8/9] virt: geniezone: Add dtb config support
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Il 09/06/23 10:52, Yi-De Wu ha scritto:
> From: "Jerry Wang" <ze-yu.wang@mediatek.com>
>
> Hypervisor might need to know the accurate address and size of dtb
> passed from userspace. And then hypervisor would parse the dtb and get
> vm information.
>
> Signed-off-by: Jerry Wang <ze-yu.wang@mediatek.com>
> Signed-off-by: Liju-clr Chen <liju-clr.chen@mediatek.com>
> Signed-off-by: Yi-De Wu <yi-de.wu@mediatek.com>
> ---
> arch/arm64/geniezone/gzvm_arch_common.h | 2 ++
> arch/arm64/geniezone/vm.c | 8 ++++++++
> drivers/virt/geniezone/gzvm_vm.c | 8 ++++++++
> include/linux/gzvm_drv.h | 1 +
> include/uapi/linux/gzvm.h | 10 ++++++++++
> 5 files changed, 29 insertions(+)
>
> diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
> index 5cfeb4df84c5..ccd2a7516eeb 100644
> --- a/arch/arm64/geniezone/gzvm_arch_common.h
> +++ b/arch/arm64/geniezone/gzvm_arch_common.h
> @@ -24,6 +24,7 @@ enum {
> GZVM_FUNC_PROBE,
> GZVM_FUNC_ENABLE_CAP,
> GZVM_FUNC_MEMREGION_PURPOSE,
> + GZVM_FUNC_SET_DTB_CONFIG,
> NR_GZVM_FUNC
> };
>
> @@ -48,6 +49,7 @@ enum {
> #define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
> #define MT_HVC_GZVM_ENABLE_CAP GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
> #define MT_HVC_GZVM_MEMREGION_PURPOSE GZVM_HCALL_ID(GZVM_FUNC_MEMREGION_PURPOSE)
> +#define MT_HVC_GZVM_SET_DTB_CONFIG GZVM_HCALL_ID(GZVM_FUNC_SET_DTB_CONFIG)
> #define GIC_V3_NR_LRS 16
>
> /**
> diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
> index e19a66d6a75d..6062fe85c70e 100644
> --- a/arch/arm64/geniezone/vm.c
> +++ b/arch/arm64/geniezone/vm.c
> @@ -106,6 +106,14 @@ int gzvm_arch_memregion_purpose(struct gzvm *gzvm, struct gzvm_userspace_memory_
> mem->flags, 0, 0, 0, &res);
> }
>
> +int gzvm_arch_set_dtb_config(struct gzvm *gzvm, struct gzvm_dtb_config *cfg)
> +{
> + struct arm_smccc_res res;
> +
> + return gzvm_hypcall_wrapper(MT_HVC_GZVM_SET_DTB_CONFIG, gzvm->vm_id, cfg->dtb_addr,
> + cfg->dtb_size, 0, 0, 0, 0, &res);
> +}
> +
> static int gzvm_vm_arch_enable_cap(struct gzvm *gzvm, struct gzvm_enable_cap *cap,
> struct arm_smccc_res *res)
> {
> diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
> index 3b1cb715ef34..d379793deace 100644
> --- a/drivers/virt/geniezone/gzvm_vm.c
> +++ b/drivers/virt/geniezone/gzvm_vm.c
> @@ -390,6 +390,14 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
> ret = gzvm_vm_ioctl_enable_cap(gzvm, &cap, argp);
> break;
> }
> + case GZVM_SET_DTB_CONFIG: {
> + struct gzvm_dtb_config cfg;
> +
> + if (copy_from_user(&cfg, argp, sizeof(cfg)))
> + goto out;
> + ret = gzvm_arch_set_dtb_config(gzvm, &cfg);
> + break;
> + }
> default:
> ret = -ENOTTY;
> }
> diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
> index 288a339bf382..e920397e83d3 100644
> --- a/include/linux/gzvm_drv.h
> +++ b/include/linux/gzvm_drv.h
> @@ -146,6 +146,7 @@ void gzvm_sync_hwstate(struct gzvm_vcpu *vcpu);
> extern struct miscdevice *gzvm_debug_dev;
>
> int gzvm_arch_memregion_purpose(struct gzvm *gzvm, struct gzvm_userspace_memory_region *mem);
> +int gzvm_arch_set_dtb_config(struct gzvm *gzvm, struct gzvm_dtb_config *args);
>
> int gzvm_init_ioeventfd(struct gzvm *gzvm);
> int gzvm_ioeventfd(struct gzvm *gzvm, struct gzvm_ioeventfd *args);
> diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
> index 2af1b068947c..28354c17ed9c 100644
> --- a/include/uapi/linux/gzvm.h
> +++ b/include/uapi/linux/gzvm.h
> @@ -265,4 +265,14 @@ struct gzvm_ioeventfd {
>
> #define GZVM_IOEVENTFD _IOW(GZVM_IOC_MAGIC, 0x79, struct gzvm_ioeventfd)
>
> +struct gzvm_dtb_config {

kerneldoc please.

> + /* dtb address set by VMM (guset memory) */
> + __u64 dtb_addr;
> + /* dtb size */
> + __u64 dtb_size;
> +};
> +
> +#define GZVM_SET_DTB_CONFIG _IOW(GZVM_IOC_MAGIC, 0xff, \
> + struct gzvm_dtb_config)
> +
> #endif /* __GZVM_H__ */

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