arch/s390/include/asm/uv.h - SHIFTPHONES/mainline/linux - Gitiles

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Ultravisor Interfaces
  *
  * Copyright IBM Corp. 2019
  *
  * Author(s):
  *	Vasily Gorbik <gor@linux.ibm.com>
  *	Janosch Frank <frankja@linux.ibm.com>
  */
 #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

 /* 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,
 };

 enum uv_feat_ind {
 	BIT_UV_FEAT_MISC = 0,
 };

 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;		/* 0x0000 */
 	u64 reserved08;				/* 0x0008 */
 	u64 inst_calls_list[4];			/* 0x0010 */
 	u64 reserved30[2];			/* 0x0030 */
 	u64 uv_base_stor_len;			/* 0x0040 */
 	u64 reserved48;				/* 0x0048 */
 	u64 conf_base_phys_stor_len;		/* 0x0050 */
 	u64 conf_base_virt_stor_len;		/* 0x0058 */
 	u64 conf_virt_var_stor_len;		/* 0x0060 */
 	u64 cpu_stor_len;			/* 0x0068 */
 	u32 reserved70[3];			/* 0x0070 */
 	u32 max_num_sec_conf;			/* 0x007c */
 	u64 max_guest_stor_addr;		/* 0x0080 */
 	u8  reserved88[158 - 136];		/* 0x0088 */
 	u16 max_guest_cpu_id;			/* 0x009e */
 	u64 uv_feature_indications;		/* 0x00a0 */
 	u8  reserveda8[200 - 168];		/* 0x00a8 */
 } __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);

 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_owned_page(unsigned long paddr);
 int uv_convert_from_secure(unsigned long paddr);
 int uv_convert_owned_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_owned_page(unsigned long paddr)
 {
 	return 0;
 }

 static inline int uv_convert_from_secure(unsigned long paddr)
 {
 	return 0;
 }

 static inline int uv_convert_owned_from_secure(unsigned long paddr)
 {
 	return 0;
 }
 #endif

 #endif /* _ASM_S390_UV_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Ultravisor Interfaces
	*
	* Copyright IBM Corp. 2019
	*
	* Author(s):
	* Vasily Gorbik <gor@linux.ibm.com>
	* Janosch Frank <frankja@linux.ibm.com>
	*/
	#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

	/* 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,
	};

	enum uv_feat_ind {
	BIT_UV_FEAT_MISC = 0,
	};

	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; /* 0x0000 */
	u64 reserved08; /* 0x0008 */
	u64 inst_calls_list[4]; /* 0x0010 */
	u64 reserved30[2]; /* 0x0030 */
	u64 uv_base_stor_len; /* 0x0040 */
	u64 reserved48; /* 0x0048 */
	u64 conf_base_phys_stor_len; /* 0x0050 */
	u64 conf_base_virt_stor_len; /* 0x0058 */
	u64 conf_virt_var_stor_len; /* 0x0060 */
	u64 cpu_stor_len; /* 0x0068 */
	u32 reserved70[3]; /* 0x0070 */
	u32 max_num_sec_conf; /* 0x007c */
	u64 max_guest_stor_addr; /* 0x0080 */
	u8 reserved88[158 - 136]; /* 0x0088 */
	u16 max_guest_cpu_id; /* 0x009e */
	u64 uv_feature_indications; /* 0x00a0 */
	u8 reserveda8[200 - 168]; /* 0x00a8 */
	} __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);

	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_owned_page(unsigned long paddr);
	int uv_convert_from_secure(unsigned long paddr);
	int uv_convert_owned_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_owned_page(unsigned long paddr)
	{
	return 0;
	}

	static inline int uv_convert_from_secure(unsigned long paddr)
	{
	return 0;
	}

	static inline int uv_convert_owned_from_secure(unsigned long paddr)
	{
	return 0;
	}
	#endif

	#endif /* _ASM_S390_UV_H */