133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Ultravisor Interfaces
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*
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* Copyright IBM Corp. 2019
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*
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* Author(s):
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* Vasily Gorbik <gor@linux.ibm.com>
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* Janosch Frank <frankja@linux.ibm.com>
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*/
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#ifndef _ASM_S390_UV_H
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#define _ASM_S390_UV_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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#include <asm/page.h>
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#define UVC_RC_EXECUTED 0x0001
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#define UVC_RC_INV_CMD 0x0002
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#define UVC_RC_INV_STATE 0x0003
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#define UVC_RC_INV_LEN 0x0005
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#define UVC_RC_NO_RESUME 0x0007
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#define UVC_CMD_QUI 0x0001
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#define UVC_CMD_SET_SHARED_ACCESS 0x1000
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#define UVC_CMD_REMOVE_SHARED_ACCESS 0x1001
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/* Bits in installed uv calls */
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enum uv_cmds_inst {
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BIT_UVC_CMD_QUI = 0,
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BIT_UVC_CMD_SET_SHARED_ACCESS = 8,
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BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9,
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};
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struct uv_cb_header {
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u16 len;
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u16 cmd; /* Command Code */
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u16 rc; /* Response Code */
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u16 rrc; /* Return Reason Code */
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} __packed __aligned(8);
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struct uv_cb_qui {
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struct uv_cb_header header;
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u64 reserved08;
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u64 inst_calls_list[4];
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u64 reserved30[15];
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} __packed __aligned(8);
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struct uv_cb_share {
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struct uv_cb_header header;
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u64 reserved08[3];
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u64 paddr;
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u64 reserved28;
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} __packed __aligned(8);
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static inline int uv_call(unsigned long r1, unsigned long r2)
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{
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int cc;
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asm volatile(
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"0: .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
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" brc 3,0b\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=d" (cc)
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: [r1] "a" (r1), [r2] "a" (r2)
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: "memory", "cc");
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return cc;
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}
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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
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extern int prot_virt_guest;
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static inline int is_prot_virt_guest(void)
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{
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return prot_virt_guest;
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}
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static inline int share(unsigned long addr, u16 cmd)
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{
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struct uv_cb_share uvcb = {
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.header.cmd = cmd,
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.header.len = sizeof(uvcb),
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.paddr = addr
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};
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if (!is_prot_virt_guest())
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return -ENOTSUPP;
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/*
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* Sharing is page wise, if we encounter addresses that are
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* not page aligned, we assume something went wrong. If
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* malloced structs are passed to this function, we could leak
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* data to the hypervisor.
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*/
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BUG_ON(addr & ~PAGE_MASK);
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if (!uv_call(0, (u64)&uvcb))
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return 0;
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return -EINVAL;
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}
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/*
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* Guest 2 request to the Ultravisor to make a page shared with the
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* hypervisor for IO.
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*
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* @addr: Real or absolute address of the page to be shared
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*/
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static inline int uv_set_shared(unsigned long addr)
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{
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return share(addr, UVC_CMD_SET_SHARED_ACCESS);
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}
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/*
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* Guest 2 request to the Ultravisor to make a page unshared.
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*
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* @addr: Real or absolute address of the page to be unshared
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*/
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static inline int uv_remove_shared(unsigned long addr)
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{
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return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
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}
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void uv_query_info(void);
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#else
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#define is_prot_virt_guest() 0
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static inline int uv_set_shared(unsigned long addr) { return 0; }
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static inline int uv_remove_shared(unsigned long addr) { return 0; }
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static inline void uv_query_info(void) {}
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#endif
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#endif /* _ASM_S390_UV_H */
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