/* $NetBSD: vmtvar.h,v 1.2 2021/03/27 21:23:14 ryo Exp $ */
/* NetBSD: vmt.c,v 1.15 2016/11/10 03:32:04 ozaki-r Exp */
/* $OpenBSD: vmt.c,v 1.11 2011/01/27 21:29:25 dtucker Exp $ */
/*
* Copyright (c) 2007 David Crawshaw <david@zentus.com>
* Copyright (c) 2008 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _DEV_VMT_VMTVAR_H_
#define _DEV_VMT_VMTVAR_H_
#include <sys/uuid.h>
#include <dev/sysmon/sysmonvar.h>
/* A register frame. */
/* XXX 'volatile' as a workaround because BACKDOOR_OP is likely broken */
struct vm_backdoor {
volatile register_t eax;
volatile register_t ebx;
volatile register_t ecx;
volatile register_t edx;
volatile register_t esi;
volatile register_t edi;
volatile register_t ebp;
};
#define VM_REG_LOW_MASK __BITS(15,0)
#define VM_REG_HIGH_MASK __BITS(31,16)
#define VM_REG_WORD_MASK __BITS(31,0)
#define VM_REG_CMD(hi, low) \
(__SHIFTIN((hi), VM_REG_HIGH_MASK) | __SHIFTIN((low), VM_REG_LOW_MASK))
#define VM_REG_CMD_RPC(cmd) VM_REG_CMD((cmd), VM_CMD_RPC)
#define VM_REG_PORT_CMD(cmd) VM_REG_CMD((cmd), VM_PORT_CMD)
#define VM_REG_PORT_RPC(cmd) VM_REG_CMD((cmd), VM_PORT_RPC)
/* RPC context. */
struct vm_rpc {
uint16_t channel;
uint32_t cookie1;
uint32_t cookie2;
};
struct vmt_event {
struct sysmon_pswitch ev_smpsw;
int ev_code;
};
struct vmt_softc {
device_t sc_dev;
struct sysctllog *sc_log;
struct vm_rpc sc_tclo_rpc;
bool sc_tclo_rpc_open;
char *sc_rpc_buf;
int sc_rpc_error;
int sc_tclo_ping;
int sc_set_guest_os;
#define VMT_RPC_BUFLEN 256
struct callout sc_tick;
struct callout sc_tclo_tick;
#define VMT_CLOCK_SYNC_PERIOD_SECONDS 60
int sc_clock_sync_period_seconds;
struct callout sc_clock_sync_tick;
struct vmt_event sc_ev_power;
struct vmt_event sc_ev_reset;
struct vmt_event sc_ev_sleep;
bool sc_smpsw_valid;
char sc_hostname[MAXHOSTNAMELEN];
char sc_uuid[_UUID_STR_LEN];
};
bool vmt_probe(void);
void vmt_common_attach(struct vmt_softc *);
int vmt_common_detach(struct vmt_softc *);
#define BACKDOOR_OP_I386(op, frame) \
__asm__ __volatile__ ( \
"pushal;" \
"pushl %%eax;" \
"movl 0x18(%%eax), %%ebp;" \
"movl 0x14(%%eax), %%edi;" \
"movl 0x10(%%eax), %%esi;" \
"movl 0x0c(%%eax), %%edx;" \
"movl 0x08(%%eax), %%ecx;" \
"movl 0x04(%%eax), %%ebx;" \
"movl 0x00(%%eax), %%eax;" \
op \
"xchgl %%eax, 0x00(%%esp);" \
"movl %%ebp, 0x18(%%eax);" \
"movl %%edi, 0x14(%%eax);" \
"movl %%esi, 0x10(%%eax);" \
"movl %%edx, 0x0c(%%eax);" \
"movl %%ecx, 0x08(%%eax);" \
"movl %%ebx, 0x04(%%eax);" \
"popl 0x00(%%eax);" \
"popal;" \
: \
:"a"(frame) \
)
#define BACKDOOR_OP_AMD64(op, frame) \
__asm__ __volatile__ ( \
"pushq %%rbp; \n\t" \
"pushq %%rax; \n\t" \
"movq 0x30(%%rax), %%rbp; \n\t" \
"movq 0x28(%%rax), %%rdi; \n\t" \
"movq 0x20(%%rax), %%rsi; \n\t" \
"movq 0x18(%%rax), %%rdx; \n\t" \
"movq 0x10(%%rax), %%rcx; \n\t" \
"movq 0x08(%%rax), %%rbx; \n\t" \
"movq 0x00(%%rax), %%rax; \n\t" \
op "\n\t" \
"xchgq %%rax, 0x00(%%rsp); \n\t" \
"movq %%rbp, 0x30(%%rax); \n\t" \
"movq %%rdi, 0x28(%%rax); \n\t" \
"movq %%rsi, 0x20(%%rax); \n\t" \
"movq %%rdx, 0x18(%%rax); \n\t" \
"movq %%rcx, 0x10(%%rax); \n\t" \
"movq %%rbx, 0x08(%%rax); \n\t" \
"popq 0x00(%%rax); \n\t" \
"popq %%rbp; \n\t" \
: /* No outputs. */ \
: "a" (frame) \
/* No pushal on amd64 so warn gcc about the clobbered registers. */\
: "rbx", "rcx", "rdx", "rdi", "rsi", "cc", "memory" \
)
#define X86_IO_MAGIC 0x86 /* magic for upper 32bit of x7 */
#define X86_IO_W7_SIZE_MASK __BITS(1, 0)
#define X86_IO_W7_SIZE(n) __SHIFTIN((n), X86_IO_W7_SIZE_MASK)
#define X86_IO_W7_DIR __BIT(2)
#define X86_IO_W7_WITH __BIT(3)
#define X86_IO_W7_STR __BIT(4)
#define X86_IO_W7_DF __BIT(5)
#define X86_IO_W7_IMM_MASK __BITS(12, 5)
#define X86_IO_W7_IMM(imm) __SHIFTIN((imm), X86_IO_W7_IMM_MASK)
#define BACKDOOR_OP_AARCH64(op, frame) \
__asm__ __volatile__ ( \
"ldp x0, x1, [%0, 8 * 0]; \n\t" \
"ldp x2, x3, [%0, 8 * 2]; \n\t" \
"ldp x4, x5, [%0, 8 * 4]; \n\t" \
"ldr x6, [%0, 8 * 6]; \n\t" \
"mov x7, %1 \n\t" \
"movk x7, %2, lsl #32; \n\t" \
"mrs xzr, mdccsr_el0; \n\t" \
"stp x0, x1, [%0, 8 * 0]; \n\t" \
"stp x2, x3, [%0, 8 * 2]; \n\t" \
"stp x4, x5, [%0, 8 * 4]; \n\t" \
"str x6, [%0, 8 * 6]; \n\t" \
: /* No outputs. */ \
: "r" (frame), \
"r" (op), \
"i" (X86_IO_MAGIC) \
: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", "memory" \
)
#if defined(__i386__)
#define BACKDOOR_OP(op, frame) BACKDOOR_OP_I386(op, frame)
#elif defined(__amd64__)
#define BACKDOOR_OP(op, frame) BACKDOOR_OP_AMD64(op, frame)
#elif defined(__aarch64__)
#define BACKDOOR_OP(op, frame) BACKDOOR_OP_AARCH64(op, frame)
#endif
#if defined(__i386__) || defined(__amd64__)
#define BACKDOOR_OP_CMD "inl %%dx, %%eax;"
#define BACKDOOR_OP_IN "cld;\n\trep insb;"
#define BACKDOOR_OP_OUT "cld;\n\trep outsb;"
#elif defined(__aarch64__)
#define BACKDOOR_OP_CMD (X86_IO_W7_WITH | X86_IO_W7_DIR | X86_IO_W7_SIZE(2))
#define BACKDOOR_OP_IN (X86_IO_W7_WITH | X86_IO_W7_STR | X86_IO_W7_DIR)
#define BACKDOOR_OP_OUT (X86_IO_W7_WITH | X86_IO_W7_STR)
#endif
static __inline void
vmt_hvcall(uint8_t cmd, u_int regs[6])
{
struct vm_backdoor frame;
memset(&frame, 0, sizeof(frame));
frame.eax = VM_MAGIC;
frame.ebx = UINT_MAX;
frame.ecx = VM_REG_CMD(0, cmd);
frame.edx = VM_REG_PORT_CMD(0);
BACKDOOR_OP(BACKDOOR_OP_CMD, &frame);
regs[0] = __SHIFTOUT(frame.eax, VM_REG_WORD_MASK);
regs[1] = __SHIFTOUT(frame.ebx, VM_REG_WORD_MASK);
regs[2] = __SHIFTOUT(frame.ecx, VM_REG_WORD_MASK);
regs[3] = __SHIFTOUT(frame.edx, VM_REG_WORD_MASK);
regs[4] = __SHIFTOUT(frame.esi, VM_REG_WORD_MASK);
regs[5] = __SHIFTOUT(frame.edi, VM_REG_WORD_MASK);
}
#endif /* _DEV_VMT_VMTVAR_H_ */