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Message-ID: <e772e44f-9c60-4c4b-8054-957b07180c45@collabora.com>
Date: Thu, 1 Feb 2024 10:44:07 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Yi-De Wu <yi-de.wu@...iatek.com>,
Yingshiuan Pan <yingshiuan.pan@...iatek.com>,
Ze-Yu Wang <ze-yu.wang@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
Richard Cochran <richardcochran@...il.com>,
Matthias Brugger <matthias.bgg@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
David Bradil <dbrazdil@...gle.com>, Trilok Soni <quic_tsoni@...cinc.com>,
My Chuang <my.chuang@...iatek.com>, Shawn Hsiao <shawn.hsiao@...iatek.com>,
PeiLun Suei <peilun.suei@...iatek.com>,
Liju Chen <liju-clr.chen@...iatek.com>,
Willix Yeh <chi-shen.yeh@...iatek.com>,
Kevenny Hsieh <kevenny.hsieh@...iatek.com>
Subject: Re: [PATCH v9 05/21] virt: geniezone: Add vm support
Il 29/01/24 09:32, Yi-De Wu ha scritto:
> From: "Yingshiuan Pan" <yingshiuan.pan@...iatek.com>
>
> The VM component is responsible for setting up the capability and memory
> management for the protected VMs. The capability is mainly about the
> lifecycle control and boot context initialization.
>
> Signed-off-by: Yingshiuan Pan <yingshiuan.pan@...iatek.com>
> Signed-off-by: Jerry Wang <ze-yu.wang@...iatek.com>
> Signed-off-by: Liju Chen <liju-clr.chen@...iatek.com>
> Signed-off-by: Yi-De Wu <yi-de.wu@...iatek.com>
> ---
> MAINTAINERS | 1 +
> arch/arm64/geniezone/gzvm_arch_common.h | 9 ++
> arch/arm64/geniezone/vm.c | 29 +++++++
> drivers/virt/geniezone/Makefile | 2 +-
> drivers/virt/geniezone/gzvm_main.c | 19 +++++
> drivers/virt/geniezone/gzvm_vm.c | 107 ++++++++++++++++++++++++
> include/linux/gzvm_drv.h | 26 ++++++
> include/uapi/linux/gzvm.h | 25 ++++++
> 8 files changed, 217 insertions(+), 1 deletion(-)
> create mode 100644 drivers/virt/geniezone/gzvm_vm.c
> create mode 100644 include/uapi/linux/gzvm.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0cb2d0599469..3ecac8794ba9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9022,6 +9022,7 @@ F: Documentation/virt/geniezone/
> F: arch/arm64/geniezone/
> F: drivers/virt/geniezone/
> F: include/linux/gzvm_drv.h
> +F: include/uapi/linux/gzvm.h
>
> GENWQE (IBM Generic Workqueue Card)
> M: Frank Haverkamp <haver@...ux.ibm.com>
> diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
> index f5bddcfe3a1f..fdaa7849353d 100644
> --- a/arch/arm64/geniezone/gzvm_arch_common.h
> +++ b/arch/arm64/geniezone/gzvm_arch_common.h
> @@ -9,6 +9,8 @@
> #include <linux/arm-smccc.h>
>
> enum {
> + GZVM_FUNC_CREATE_VM = 0,
GZVM_FUNC_CREATE_VM,
GZVM_FUNC_DESTROY_VM,
The first one will always be zero by default, subsequent members are always
incremental anyway.
> + GZVM_FUNC_DESTROY_VM = 1,
> GZVM_FUNC_PROBE = 12,
> NR_GZVM_FUNC,
> };
> @@ -19,6 +21,8 @@ enum {
> ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64, \
> SMC_ENTITY_MTK, (GZVM_FUNCID_START + (func)))
>
> +#define MT_HVC_GZVM_CREATE_VM GZVM_HCALL_ID(GZVM_FUNC_CREATE_VM)
> +#define MT_HVC_GZVM_DESTROY_VM GZVM_HCALL_ID(GZVM_FUNC_DESTROY_VM)
> #define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
>
> /**
> @@ -41,4 +45,9 @@ int gzvm_hypcall_wrapper(unsigned long a0, unsigned long a1,
> unsigned long a6, unsigned long a7,
> struct arm_smccc_res *res);
>
> +static inline u16 get_vmid_from_tuple(unsigned int tuple)
> +{
> + return (u16)(tuple >> 16);
As far as I can understand, this tuple is a union of two u16.
If you add that union, you won't even need this function anymore.
> +}
> +
> #endif /* __GZVM_ARCH_COMMON_H__ */
> diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
> index e313aadec212..a15bad13c2ee 100644
> --- a/arch/arm64/geniezone/vm.c
> +++ b/arch/arm64/geniezone/vm.c
> @@ -7,9 +7,12 @@
> #include <linux/err.h>
> #include <linux/uaccess.h>
>
> +#include <linux/gzvm.h>
> #include <linux/gzvm_drv.h>
> #include "gzvm_arch_common.h"
>
> +#define PAR_PA47_MASK ((((1UL << 48) - 1) >> 12) << 12)
This value is unused. Anyway, isn't this just GENMASK_ULL(47, 12) ?!
> +
> /**
> * gzvm_hypcall_wrapper() - the wrapper for hvc calls
> * @a0: arguments passed in registers 0
> @@ -45,3 +48,29 @@ int gzvm_arch_probe(void)
>
> return 0;
> }
> +
> +/**
> + * gzvm_arch_create_vm() - create vm
> + * @vm_type: VM type. Only supports Linux VM now.
> + *
> + * Return:
> + * * positive value - VM ID
> + * * -ENOMEM - Memory not enough for storing VM data
> + */
> +int gzvm_arch_create_vm(unsigned long vm_type)
> +{
> + struct arm_smccc_res res;
> + int ret;
> +
> + ret = gzvm_hypcall_wrapper(MT_HVC_GZVM_CREATE_VM, vm_type, 0, 0, 0, 0,
> + 0, 0, &res);
> + return ret ? ret : res.a1;
> +}
> +
> +int gzvm_arch_destroy_vm(u16 vm_id)
> +{
> + struct arm_smccc_res res;
> +
> + return gzvm_hypcall_wrapper(MT_HVC_GZVM_DESTROY_VM, vm_id, 0, 0, 0, 0,
> + 0, 0, &res);
> +}
> diff --git a/drivers/virt/geniezone/Makefile b/drivers/virt/geniezone/Makefile
> index 8c1f0053e773..066efddc0b9c 100644
> --- a/drivers/virt/geniezone/Makefile
> +++ b/drivers/virt/geniezone/Makefile
> @@ -6,5 +6,5 @@
>
> GZVM_DIR ?= ../../../drivers/virt/geniezone
>
> -gzvm-y := $(GZVM_DIR)/gzvm_main.o
> +gzvm-y := $(GZVM_DIR)/gzvm_main.o $(GZVM_DIR)/gzvm_vm.o
>
> diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c
> index f7d4f0646d97..4e7d60067c55 100644
> --- a/drivers/virt/geniezone/gzvm_main.c
> +++ b/drivers/virt/geniezone/gzvm_main.c
> @@ -4,6 +4,7 @@
> */
>
> #include <linux/device.h>
> +#include <linux/file.h>
> #include <linux/kdev_t.h>
> #include <linux/miscdevice.h>
> #include <linux/module.h>
> @@ -40,7 +41,24 @@ int gzvm_err_to_errno(unsigned long err)
> return -EINVAL;
> }
>
> +static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
> + unsigned long user_args)
> +{
> + long ret;
> +
> + switch (cmd) {
> + case GZVM_CREATE_VM:
> + ret = gzvm_dev_ioctl_create_vm(user_args);
> + return ret;
return gzvm_dev_ioctl_create_vm(user_args);
> + default:
> + break;
> + }
> +
> + return -ENOTTY;
> +}
> +
> static const struct file_operations gzvm_chardev_ops = {
> + .unlocked_ioctl = gzvm_dev_ioctl,
> .llseek = noop_llseek,
> };
>
> @@ -62,6 +80,7 @@ static int gzvm_drv_probe(struct platform_device *pdev)
>
> static int gzvm_drv_remove(struct platform_device *pdev)
> {
> + gzvm_destroy_all_vms();
> misc_deregister(&gzvm_dev);
> return 0;
> }
> diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
> new file mode 100644
> index 000000000000..d5e850af924a
> --- /dev/null
> +++ b/drivers/virt/geniezone/gzvm_vm.c
> @@ -0,0 +1,107 @@
..snip..
> diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
> index 907f2f984de9..f1dce23838e4 100644
> --- a/include/linux/gzvm_drv.h
> +++ b/include/linux/gzvm_drv.h
> @@ -6,6 +6,12 @@
> #ifndef __GZVM_DRV_H__
> #define __GZVM_DRV_H__
>
> +#include <linux/list.h>
> +#include <linux/mutex.h>
> +#include <linux/gzvm.h>
> +
> +#define INVALID_VM_ID 0xffff
> +
> /*
> * These are the definitions of APIs between GenieZone hypervisor and driver,
> * there's no need to be visible to uapi. Furthermore, we need GenieZone
> @@ -17,9 +23,29 @@
> #define ERR_NOT_IMPLEMENTED (-27)
> #define ERR_FAULT (-40)
>
> +/*
> + * The following data structures are for data transferring between driver and
> + * hypervisor, and they're aligned with hypervisor definitions
> + */
> +
> +struct gzvm {
> + /* userspace tied to this vm */
> + struct mm_struct *mm;
> + /* lock for list_add*/
Why are you not using kerneldoc to document this structure?
After all, you're already partially documenting it.
> + struct mutex lock;
> + struct list_head vm_list;
> + u16 vm_id;
> +};
> +
> +int gzvm_dev_ioctl_create_vm(unsigned long vm_type);
> +
> int gzvm_err_to_errno(unsigned long err);
>
Why is there a trailing space on this function sig?
Regards,
Angelo
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