[PATCH v6 06/15] virt: geniezone: Add vm capability check
From: Yi-De Wu
Date: Tue Sep 19 2023 - 07:13:01 EST
From: "Yingshiuan Pan" <yingshiuan.pan@xxxxxxxxxxxx>
Inquire the `capability support` on GenieZone hypervisor.
Example:
`GZVM_CAP_PROTECTED_VM` or `GZVM_CAP_VM_GPA_SIZE`.
Signed-off-by: Yingshiuan Pan <yingshiuan.pan@xxxxxxxxxxxx>
Signed-off-by: Jerry Wang <ze-yu.wang@xxxxxxxxxxxx>
Signed-off-by: kevenny hsieh <kevenny.hsieh@xxxxxxxxxxxx>
Signed-off-by: Liju Chen <liju-clr.chen@xxxxxxxxxxxx>
Signed-off-by: Yi-De Wu <yi-de.wu@xxxxxxxxxxxx>
---
arch/arm64/geniezone/gzvm_arch_common.h | 2 +
arch/arm64/geniezone/vm.c | 122 ++++++++++++++++++++++++
drivers/virt/geniezone/gzvm_main.c | 27 ++++++
drivers/virt/geniezone/gzvm_vm.c | 21 ++++
include/linux/gzvm_drv.h | 6 +-
include/uapi/linux/gzvm.h | 31 ++++++
6 files changed, 208 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 14d288299435..6c4e48c72b09 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -13,6 +13,7 @@ enum {
GZVM_FUNC_DESTROY_VM = 1,
GZVM_FUNC_SET_MEMREGION = 4,
GZVM_FUNC_PROBE = 12,
+ GZVM_FUNC_ENABLE_CAP = 13,
NR_GZVM_FUNC,
};
@@ -26,6 +27,7 @@ enum {
#define MT_HVC_GZVM_DESTROY_VM GZVM_HCALL_ID(GZVM_FUNC_DESTROY_VM)
#define MT_HVC_GZVM_SET_MEMREGION GZVM_HCALL_ID(GZVM_FUNC_SET_MEMREGION)
#define MT_HVC_GZVM_PROBE GZVM_HCALL_ID(GZVM_FUNC_PROBE)
+#define MT_HVC_GZVM_ENABLE_CAP GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
/**
* gzvm_hypcall_wrapper() - the wrapper for hvc calls
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index 47b41ac47f7a..846e6c559180 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -33,6 +33,40 @@ int gzvm_arch_set_memregion(u16 vm_id, size_t buf_size,
buf_size, region, 0, 0, 0, 0, &res);
}
+static int gzvm_cap_vm_gpa_size(void __user *argp)
+{
+ __u64 value = CONFIG_ARM64_PA_BITS;
+
+ if (copy_to_user(argp, &value, sizeof(__u64)))
+ return -EFAULT;
+
+ return 0;
+}
+
+int gzvm_arch_check_extension(struct gzvm *gzvm, __u64 cap, void __user *argp)
+{
+ int ret;
+
+ switch (cap) {
+ case GZVM_CAP_PROTECTED_VM: {
+ __u64 success = 1;
+
+ if (copy_to_user(argp, &success, sizeof(__u64)))
+ return -EFAULT;
+
+ return 0;
+ }
+ case GZVM_CAP_VM_GPA_SIZE: {
+ ret = gzvm_cap_vm_gpa_size(argp);
+ return ret;
+ }
+ default:
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
/**
* gzvm_arch_create_vm() - create vm
* @vm_type: VM type. Only supports Linux VM now.
@@ -59,6 +93,94 @@ int gzvm_arch_destroy_vm(u16 vm_id)
0, 0, &res);
}
+static int gzvm_vm_arch_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ struct arm_smccc_res *res)
+{
+ return gzvm_hypcall_wrapper(MT_HVC_GZVM_ENABLE_CAP, gzvm->vm_id,
+ cap->cap, cap->args[0], cap->args[1],
+ cap->args[2], cap->args[3], cap->args[4],
+ res);
+}
+
+/**
+ * gzvm_vm_ioctl_get_pvmfw_size() - Get pvmfw size from hypervisor, return
+ * in x1, and return to userspace in args
+ * @gzvm: Pointer to struct gzvm.
+ * @cap: Pointer to struct gzvm_enable_cap.
+ * @argp: Pointer to struct gzvm_enable_cap in user space.
+ *
+ * Return:
+ * * 0 - Succeed
+ * * -EINVAL - Hypervisor return invalid results
+ * * -EFAULT - Fail to copy back to userspace buffer
+ */
+static int gzvm_vm_ioctl_get_pvmfw_size(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp)
+{
+ struct arm_smccc_res res = {0};
+
+ if (gzvm_vm_arch_enable_cap(gzvm, cap, &res) != 0)
+ return -EINVAL;
+
+ cap->args[1] = res.a1;
+ if (copy_to_user(argp, cap, sizeof(*cap)))
+ return -EFAULT;
+
+ return 0;
+}
+
+/**
+ * gzvm_vm_ioctl_cap_pvm() - Proceed GZVM_CAP_PROTECTED_VM's subcommands
+ * @gzvm: Pointer to struct gzvm.
+ * @cap: Pointer to struct gzvm_enable_cap.
+ * @argp: Pointer to struct gzvm_enable_cap in user space.
+ *
+ * Return:
+ * * 0 - Succeed
+ * * -EINVAL - Invalid subcommand or arguments
+ */
+static int gzvm_vm_ioctl_cap_pvm(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp)
+{
+ struct arm_smccc_res res = {0};
+ int ret;
+
+ switch (cap->args[0]) {
+ case GZVM_CAP_PVM_SET_PVMFW_GPA:
+ fallthrough;
+ case GZVM_CAP_PVM_SET_PROTECTED_VM:
+ ret = gzvm_vm_arch_enable_cap(gzvm, cap, &res);
+ return ret;
+ case GZVM_CAP_PVM_GET_PVMFW_SIZE:
+ ret = gzvm_vm_ioctl_get_pvmfw_size(gzvm, cap, argp);
+ return ret;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp)
+{
+ int ret;
+
+ switch (cap->cap) {
+ case GZVM_CAP_PROTECTED_VM:
+ ret = gzvm_vm_ioctl_cap_pvm(gzvm, cap, argp);
+ return ret;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
/**
* gzvm_hva_to_pa_arch() - converts hva to pa with arch-specific way
* @hva: Host virtual address.
diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c
index 4e7d60067c55..30f6c3975026 100644
--- a/drivers/virt/geniezone/gzvm_main.c
+++ b/drivers/virt/geniezone/gzvm_main.c
@@ -41,6 +41,28 @@ int gzvm_err_to_errno(unsigned long err)
return -EINVAL;
}
+/**
+ * gzvm_dev_ioctl_check_extension() - Check if given capability is support
+ * or not
+ *
+ * @gzvm: Pointer to struct gzvm
+ * @args: Pointer in u64 from userspace
+ *
+ * Return:
+ * * 0 - Supported, no error
+ * * -EOPNOTSUPP - Unsupported
+ * * -EFAULT - Failed to get data from userspace
+ */
+long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args)
+{
+ __u64 cap;
+ void __user *argp = (void __user *)args;
+
+ if (copy_from_user(&cap, argp, sizeof(uint64_t)))
+ return -EFAULT;
+ return gzvm_arch_check_extension(gzvm, cap, argp);
+}
+
static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
unsigned long user_args)
{
@@ -50,6 +72,11 @@ static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
case GZVM_CREATE_VM:
ret = gzvm_dev_ioctl_create_vm(user_args);
return ret;
+ case GZVM_CHECK_EXTENSION:
+ if (!user_args)
+ return -EINVAL;
+ ret = gzvm_dev_ioctl_check_extension(NULL, user_args);
+ return ret;
default:
break;
}
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
index e0751811cce6..82ef0b79e530 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -170,6 +170,13 @@ gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
return register_memslot_addr_range(gzvm, memslot);
}
+static int gzvm_vm_ioctl_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp)
+{
+ return gzvm_vm_ioctl_arch_enable_cap(gzvm, cap, argp);
+}
+
/* gzvm_vm_ioctl() - Ioctl handler of VM FD */
static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
unsigned long arg)
@@ -179,6 +186,10 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
struct gzvm *gzvm = filp->private_data;
switch (ioctl) {
+ case GZVM_CHECK_EXTENSION: {
+ ret = gzvm_dev_ioctl_check_extension(gzvm, arg);
+ break;
+ }
case GZVM_SET_USER_MEMORY_REGION: {
struct gzvm_userspace_memory_region userspace_mem;
@@ -189,6 +200,16 @@ static long gzvm_vm_ioctl(struct file *filp, unsigned int ioctl,
ret = gzvm_vm_ioctl_set_memory_region(gzvm, &userspace_mem);
break;
}
+ case GZVM_ENABLE_CAP: {
+ struct gzvm_enable_cap cap;
+
+ if (copy_from_user(&cap, argp, sizeof(cap))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret = gzvm_vm_ioctl_enable_cap(gzvm, &cap, argp);
+ break;
+ }
default:
ret = -ENOTTY;
}
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index aa1eaf4d43b4..a7d6df29b34e 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -73,6 +73,7 @@ struct gzvm {
u16 vm_id;
};
+long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args);
int gzvm_dev_ioctl_create_vm(unsigned long vm_type);
int gzvm_err_to_errno(unsigned long err);
@@ -83,9 +84,12 @@ void gzvm_destroy_all_vms(void);
int gzvm_arch_probe(void);
int gzvm_arch_set_memregion(u16 vm_id, size_t buf_size,
phys_addr_t region);
+int gzvm_arch_check_extension(struct gzvm *gzvm, __u64 cap, void __user *argp);
int gzvm_arch_create_vm(unsigned long vm_type);
int gzvm_arch_destroy_vm(u16 vm_id);
-
+int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm,
+ struct gzvm_enable_cap *cap,
+ void __user *argp);
u64 gzvm_hva_to_pa_arch(u64 hva);
u64 hva_to_pa_fast(u64 hva);
u64 hva_to_pa_slow(u64 hva);
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
index d2d5e6cfc2c9..77a58ee085df 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -16,12 +16,30 @@
#include <linux/types.h>
#include <linux/ioctl.h>
+#define GZVM_CAP_VM_GPA_SIZE 0xa5
+#define GZVM_CAP_PROTECTED_VM 0xffbadab1
+
+/* sub-commands put in args[0] for GZVM_CAP_PROTECTED_VM */
+#define GZVM_CAP_PVM_SET_PVMFW_GPA 0
+#define GZVM_CAP_PVM_GET_PVMFW_SIZE 1
+/* GZVM_CAP_PVM_SET_PROTECTED_VM only sets protected but not load pvmfw */
+#define GZVM_CAP_PVM_SET_PROTECTED_VM 2
+
/* GZVM ioctls */
#define GZVM_IOC_MAGIC 0x92 /* gz */
/* ioctls for /dev/gzvm fds */
#define GZVM_CREATE_VM _IO(GZVM_IOC_MAGIC, 0x01) /* Returns a Geniezone VM fd */
+/*
+ * Check if the given capability is supported or not.
+ * The argument is capability. Ex. GZVM_CAP_PROTECTED_VM or GZVM_CAP_VM_GPA_SIZE
+ * return is 0 (supported, no error)
+ * return is -EOPNOTSUPP (unsupported)
+ * return is -EFAULT (failed to get the argument from userspace)
+ */
+#define GZVM_CHECK_EXTENSION _IO(GZVM_IOC_MAGIC, 0x03)
+
/* ioctls for VM fds */
/* for GZVM_SET_MEMORY_REGION */
struct gzvm_memory_region {
@@ -48,4 +66,17 @@ struct gzvm_userspace_memory_region {
#define GZVM_SET_USER_MEMORY_REGION _IOW(GZVM_IOC_MAGIC, 0x46, \
struct gzvm_userspace_memory_region)
+/**
+ * struct gzvm_enable_cap: The `capability support` on GenieZone hypervisor
+ * @cap: `GZVM_CAP_ARM_PROTECTED_VM` or `GZVM_CAP_ARM_VM_IPA_SIZE`
+ * @args: x3-x7 registers can be used for additional args
+ */
+struct gzvm_enable_cap {
+ __u64 cap;
+ __u64 args[5];
+};
+
+#define GZVM_ENABLE_CAP _IOW(GZVM_IOC_MAGIC, 0xa3, \
+ struct gzvm_enable_cap)
+
#endif /* __GZVM_H__ */
--
2.18.0