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alistair23-linux/arch/s390/include/asm/uv.h
Janosch Frank 8a8378fa61 KVM: s390: protvirt: Add UV cpu reset calls 
For protected VMs, the VCPU resets are done by the Ultravisor, as KVM
has no access to the VCPU registers.

Note that the ultravisor will only accept a call for the exact reset
that has been requested.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2020-02-27 19:47:12 +01:00

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8.3 KiB
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/* 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_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_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,
};
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_cpus;
u8 reserveda0[200 - 160];
} __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_cpus;
};
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_convert_from_secure(unsigned long paddr);
int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
void setup_uv(void);
void adjust_to_uv_max(unsigned long *vmax);
#else
#define is_prot_virt_host() 0
static inline void setup_uv(void) {}
static inline void adjust_to_uv_max(unsigned long *vmax) {}
static inline int uv_convert_from_secure(unsigned long paddr)
{
return 0;
}
#endif
#if defined(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) || IS_ENABLED(CONFIG_KVM)
void uv_query_info(void);
#else
static inline void uv_query_info(void) {}
#endif
#endif /* _ASM_S390_UV_H */
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