diff options
| author |   Steffen Eiden <seiden@linux.ibm.com> | 2022-05-16 11:33:35 +0000 |
|---|---|---|
| committer |   Janosch Frank <frankja@linux.ibm.com> | 2022-05-20 16:38:35 +0200 |
| commit | 4689752c79fa30e91b49b39a9fba93c4d1f3e20c (patch) | |
| tree | e76b156702241c464684e2f0a5f0a07409b0318f /arch/s390/include/uapi | |
| parent | Linux 5.18-rc2 (diff) | |
| download | linux-dev-4689752c79fa30e91b49b39a9fba93c4d1f3e20c.tar.xz linux-dev-4689752c79fa30e91b49b39a9fba93c4d1f3e20c.zip | |
drivers/s390/char: Add Ultravisor io device
This patch adds a new miscdevice to expose some Ultravisor functions
to userspace. Userspace can send IOCTLs to the uvdevice that will then
emit a corresponding Ultravisor Call and hands the result over to
userspace. The uvdevice is available if the Ultravisor Call facility is
present.
Userspace can call the Retrieve Attestation Measurement
Ultravisor Call using IOCTLs on the uvdevice.
The uvdevice will do some sanity checks first.
Then, copy the request data to kernel space, build the UVCB,
perform the UV call, and copy the result back to userspace.
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/kvm/20220516113335.338212-1-seiden@linux.ibm.com/
Message-Id: <20220516113335.338212-1-seiden@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com> (whitespace and tristate fixes, pick)
Diffstat (limited to 'arch/s390/include/uapi')
| -rw-r--r-- | arch/s390/include/uapi/asm/uvdevice.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/uvdevice.h b/arch/s390/include/uapi/asm/uvdevice.h new file mode 100644 index 000000000000..10a5ac918e02 --- /dev/null +++ b/arch/s390/include/uapi/asm/uvdevice.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Copyright IBM Corp. 2022 + * Author(s): Steffen Eiden <seiden@linux.ibm.com> + */ +#ifndef __S390_ASM_UVDEVICE_H +#define __S390_ASM_UVDEVICE_H + +#include <linux/types.h> + +struct uvio_ioctl_cb { + __u32 flags; + __u16 uv_rc; /* UV header rc value */ + __u16 uv_rrc; /* UV header rrc value */ + __u64 argument_addr; /* Userspace address of uvio argument */ + __u32 argument_len; + __u8 reserved14[0x40 - 0x14]; /* must be zero */ +}; + +#define UVIO_ATT_USER_DATA_LEN 0x100 +#define UVIO_ATT_UID_LEN 0x10 +struct uvio_attest { + __u64 arcb_addr; /* 0x0000 */ + __u64 meas_addr; /* 0x0008 */ + __u64 add_data_addr; /* 0x0010 */ + __u8 user_data[UVIO_ATT_USER_DATA_LEN]; /* 0x0018 */ + __u8 config_uid[UVIO_ATT_UID_LEN]; /* 0x0118 */ + __u32 arcb_len; /* 0x0128 */ + __u32 meas_len; /* 0x012c */ + __u32 add_data_len; /* 0x0130 */ + __u16 user_data_len; /* 0x0134 */ + __u16 reserved136; /* 0x0136 */ +}; + +/* + * The following max values define an upper length for the IOCTL in/out buffers. + * However, they do not represent the maximum the Ultravisor allows which is + * often way smaller. By allowing larger buffer sizes we hopefully do not need + * to update the code with every machine update. It is therefore possible for + * userspace to request more memory than actually used by kernel/UV. + */ +#define UVIO_ATT_ARCB_MAX_LEN 0x100000 +#define UVIO_ATT_MEASUREMENT_MAX_LEN 0x8000 +#define UVIO_ATT_ADDITIONAL_MAX_LEN 0x8000 + +#define UVIO_DEVICE_NAME "uv" +#define UVIO_TYPE_UVC 'u' + +#define UVIO_IOCTL_ATT _IOWR(UVIO_TYPE_UVC, 0x01, struct uvio_ioctl_cb) + +#endif /* __S390_ASM_UVDEVICE_H */ |