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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Ultravisor Interfaces
*
* Copyright IBM Corp. 2019, 2022
*
* Author(s):
* Vasily Gorbik <[email protected]>
* Janosch Frank <[email protected]>
*/
#ifndef _ASM_S390_UV_H
#define _ASM_S390_UV_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/sched.h>
#include <asm/page.h>
#include <asm/gmap.h>
#define UVC_CC_OK 0
#define UVC_CC_ERROR 1
#define UVC_CC_BUSY 2
#define UVC_CC_PARTIAL 3
#define UVC_RC_EXECUTED 0x0001
#define UVC_RC_INV_CMD 0x0002
#define UVC_RC_INV_STATE 0x0003
#define UVC_RC_INV_LEN 0x0005
#define UVC_RC_NO_RESUME 0x0007
#define UVC_RC_NEED_DESTROY 0x8000
#define UVC_CMD_QUI 0x0001
#define UVC_CMD_INIT_UV 0x000f
#define UVC_CMD_CREATE_SEC_CONF 0x0100
#define UVC_CMD_DESTROY_SEC_CONF 0x0101
#define UVC_CMD_CREATE_SEC_CPU 0x0120
#define UVC_CMD_DESTROY_SEC_CPU 0x0121
#define UVC_CMD_CONV_TO_SEC_STOR 0x0200
#define UVC_CMD_CONV_FROM_SEC_STOR 0x0201
#define UVC_CMD_DESTR_SEC_STOR 0x0202
#define UVC_CMD_SET_SEC_CONF_PARAMS 0x0300
#define UVC_CMD_UNPACK_IMG 0x0301
#define UVC_CMD_VERIFY_IMG 0x0302
#define UVC_CMD_CPU_RESET 0x0310
#define UVC_CMD_CPU_RESET_INITIAL 0x0311
#define UVC_CMD_PREPARE_RESET 0x0320
#define UVC_CMD_CPU_RESET_CLEAR 0x0321
#define UVC_CMD_CPU_SET_STATE 0x0330
#define UVC_CMD_SET_UNSHARE_ALL 0x0340
#define UVC_CMD_PIN_PAGE_SHARED 0x0341
#define UVC_CMD_UNPIN_PAGE_SHARED 0x0342
#define UVC_CMD_SET_SHARED_ACCESS 0x1000
#define UVC_CMD_REMOVE_SHARED_ACCESS 0x1001
#define UVC_CMD_RETR_ATTEST 0x1020
/* Bits in installed uv calls */
enum uv_cmds_inst {
BIT_UVC_CMD_QUI = 0,
BIT_UVC_CMD_INIT_UV = 1,
BIT_UVC_CMD_CREATE_SEC_CONF = 2,
BIT_UVC_CMD_DESTROY_SEC_CONF = 3,
BIT_UVC_CMD_CREATE_SEC_CPU = 4,
BIT_UVC_CMD_DESTROY_SEC_CPU = 5,
BIT_UVC_CMD_CONV_TO_SEC_STOR = 6,
BIT_UVC_CMD_CONV_FROM_SEC_STOR = 7,
BIT_UVC_CMD_SET_SHARED_ACCESS = 8,
BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9,
BIT_UVC_CMD_SET_SEC_PARMS = 11,
BIT_UVC_CMD_UNPACK_IMG = 13,
BIT_UVC_CMD_VERIFY_IMG = 14,
BIT_UVC_CMD_CPU_RESET = 15,
BIT_UVC_CMD_CPU_RESET_INITIAL = 16,
BIT_UVC_CMD_CPU_SET_STATE = 17,
BIT_UVC_CMD_PREPARE_RESET = 18,
BIT_UVC_CMD_CPU_PERFORM_CLEAR_RESET = 19,
BIT_UVC_CMD_UNSHARE_ALL = 20,
BIT_UVC_CMD_PIN_PAGE_SHARED = 21,
BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
BIT_UVC_CMD_RETR_ATTEST = 28,
};
enum uv_feat_ind {
BIT_UV_FEAT_MISC = 0,
BIT_UV_FEAT_AIV = 1,
};
struct uv_cb_header {
u16 len;
u16 cmd; /* Command Code */
u16 rc; /* Response Code */
u16 rrc; /* Return Reason Code */
} __packed __aligned(8);
/* Query Ultravisor Information */
struct uv_cb_qui {
struct uv_cb_header header;
u64 reserved08;
u64 inst_calls_list[4];
u64 reserved30[2];
u64 uv_base_stor_len;
u64 reserved48;
u64 conf_base_phys_stor_len;
u64 conf_base_virt_stor_len;
u64 conf_virt_var_stor_len;
u64 cpu_stor_len;
u32 reserved70[3];
u32 max_num_sec_conf;
u64 max_guest_stor_addr;
u8 reserved88[158 - 136];
u16 max_guest_cpu_id;
u64 uv_feature_indications;
u8 reserveda0[200 - 168];
} __packed __aligned(8);
/* Initialize Ultravisor */
struct uv_cb_init {
struct uv_cb_header header;
u64 reserved08[2];
u64 stor_origin;
u64 stor_len;
u64 reserved28[4];
} __packed __aligned(8);
/* Create Guest Configuration */
struct uv_cb_cgc {
struct uv_cb_header header;
u64 reserved08[2];
u64 guest_handle;
u64 conf_base_stor_origin;
u64 conf_virt_stor_origin;
u64 reserved30;
u64 guest_stor_origin;
u64 guest_stor_len;
u64 guest_sca;
u64 guest_asce;
u64 reserved58[5];
} __packed __aligned(8);
/* Create Secure CPU */
struct uv_cb_csc {
struct uv_cb_header header;
u64 reserved08[2];
u64 cpu_handle;
u64 guest_handle;
u64 stor_origin;
u8 reserved30[6];
u16 num;
u64 state_origin;
u64 reserved40[4];
} __packed __aligned(8);
/* Convert to Secure */
struct uv_cb_cts {
struct uv_cb_header header;
u64 reserved08[2];
u64 guest_handle;
u64 gaddr;
} __packed __aligned(8);
/* Convert from Secure / Pin Page Shared */
struct uv_cb_cfs {
struct uv_cb_header header;
u64 reserved08[2];
u64 paddr;
} __packed __aligned(8);
/* Set Secure Config Parameter */
struct uv_cb_ssc {
struct uv_cb_header header;
u64 reserved08[2];
u64 guest_handle;
u64 sec_header_origin;
u32 sec_header_len;
u32 reserved2c;
u64 reserved30[4];
} __packed __aligned(8);
/* Unpack */
struct uv_cb_unp {
struct uv_cb_header header;
u64 reserved08[2];
u64 guest_handle;
u64 gaddr;
u64 tweak[2];
u64 reserved38[3];
} __packed __aligned(8);
#define PV_CPU_STATE_OPR 1
#define PV_CPU_STATE_STP 2
#define PV_CPU_STATE_CHKSTP 3
#define PV_CPU_STATE_OPR_LOAD 5
struct uv_cb_cpu_set_state {
struct uv_cb_header header;
u64 reserved08[2];
u64 cpu_handle;
u8 reserved20[7];
u8 state;
u64 reserved28[5];
};
/*
* A common UV call struct for calls that take no payload
* Examples:
* Destroy cpu/config
* Verify
*/
struct uv_cb_nodata {
struct uv_cb_header header;
u64 reserved08[2];
u64 handle;
u64 reserved20[4];
} __packed __aligned(8);
/* Set Shared Access */
struct uv_cb_share {
struct uv_cb_header header;
u64 reserved08[3];
u64 paddr;
u64 reserved28;
} __packed __aligned(8);
/* Retrieve Attestation Measurement */
struct uv_cb_attest {
struct uv_cb_header header; /* 0x0000 */
u64 reserved08[2]; /* 0x0008 */
u64 arcb_addr; /* 0x0018 */
u64 cont_token; /* 0x0020 */
u8 reserved28[6]; /* 0x0028 */
u16 user_data_len; /* 0x002e */
u8 user_data[256]; /* 0x0030 */
u32 reserved130[3]; /* 0x0130 */
u32 meas_len; /* 0x013c */
u64 meas_addr; /* 0x0140 */
u8 config_uid[16]; /* 0x0148 */
u32 reserved158; /* 0x0158 */
u32 add_data_len; /* 0x015c */
u64 add_data_addr; /* 0x0160 */
u64 reserved168[4]; /* 0x0168 */
} __packed __aligned(8);
static inline int __uv_call(unsigned long r1, unsigned long r2)
{
int cc;
asm volatile(
" .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
" ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc)
: [r1] "a" (r1), [r2] "a" (r2)
: "memory", "cc");
return cc;
}
static inline int uv_call(unsigned long r1, unsigned long r2)
{
int cc;
do {
cc = __uv_call(r1, r2);
} while (cc > 1);
return cc;
}
/* Low level uv_call that avoids stalls for long running busy conditions */
static inline int uv_call_sched(unsigned long r1, unsigned long r2)
{
int cc;
do {
cc = __uv_call(r1, r2);
cond_resched();
} while (cc > 1);
return cc;
}
/*
* special variant of uv_call that only transports the cpu or guest
* handle and the command, like destroy or verify.
*/
static inline int uv_cmd_nodata(u64 handle, u16 cmd, u16 *rc, u16 *rrc)
{
struct uv_cb_nodata uvcb = {
.header.cmd = cmd,
.header.len = sizeof(uvcb),
.handle = handle,
};
int cc;
WARN(!handle, "No handle provided to Ultravisor call cmd %x\n", cmd);
cc = uv_call_sched(0, (u64)&uvcb);
*rc = uvcb.header.rc;
*rrc = uvcb.header.rrc;
return cc ? -EINVAL : 0;
}
struct uv_info {
unsigned long inst_calls_list[4];
unsigned long uv_base_stor_len;
unsigned long guest_base_stor_len;
unsigned long guest_virt_base_stor_len;
unsigned long guest_virt_var_stor_len;
unsigned long guest_cpu_stor_len;
unsigned long max_sec_stor_addr;
unsigned int max_num_sec_conf;
unsigned short max_guest_cpu_id;
unsigned long uv_feature_indications;
};
extern struct uv_info uv_info;
#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
extern int prot_virt_guest;
static inline int is_prot_virt_guest(void)
{
return prot_virt_guest;
}
static inline int share(unsigned long addr, u16 cmd)
{
struct uv_cb_share uvcb = {
.header.cmd = cmd,
.header.len = sizeof(uvcb),
.paddr = addr
};
if (!is_prot_virt_guest())
return -EOPNOTSUPP;
/*
* Sharing is page wise, if we encounter addresses that are
* not page aligned, we assume something went wrong. If
* malloced structs are passed to this function, we could leak
* data to the hypervisor.
*/
BUG_ON(addr & ~PAGE_MASK);
if (!uv_call(0, (u64)&uvcb))
return 0;
return -EINVAL;
}
/*
* Guest 2 request to the Ultravisor to make a page shared with the
* hypervisor for IO.
*
* @addr: Real or absolute address of the page to be shared
*/
static inline int uv_set_shared(unsigned long addr)
{
return share(addr, UVC_CMD_SET_SHARED_ACCESS);
}
/*
* Guest 2 request to the Ultravisor to make a page unshared.
*
* @addr: Real or absolute address of the page to be unshared
*/
static inline int uv_remove_shared(unsigned long addr)
{
return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
}
#else
#define is_prot_virt_guest() 0
static inline int uv_set_shared(unsigned long addr) { return 0; }
static inline int uv_remove_shared(unsigned long addr) { return 0; }
#endif
#if IS_ENABLED(CONFIG_KVM)
extern int prot_virt_host;
static inline int is_prot_virt_host(void)
{
return prot_virt_host;
}
int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb);
int uv_destroy_page(unsigned long paddr);
int uv_convert_from_secure(unsigned long paddr);
int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
void setup_uv(void);
#else
#define is_prot_virt_host() 0
static inline void setup_uv(void) {}
static inline int uv_destroy_page(unsigned long paddr)
{
return 0;
}
static inline int uv_convert_from_secure(unsigned long paddr)
{
return 0;
}
#endif
#endif /* _ASM_S390_UV_H */
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