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freebsd-skq/lib/libvmmapi/vmmapi_freebsd.c
pfg 260ba0bff1 lib: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <machine/specialreg.h>
#include <machine/segments.h>
#include <machine/vmm.h>
#include <errno.h>
#include <string.h>
#include "vmmapi.h"
#define I386_TSS_SIZE 104
#define DESC_PRESENT 0x00000080
#define DESC_LONGMODE 0x00002000
#define DESC_DEF32 0x00004000
#define DESC_GRAN 0x00008000
#define DESC_UNUSABLE 0x00010000
#define GUEST_NULL_SEL 0
#define GUEST_CODE_SEL 1
#define GUEST_DATA_SEL 2
#define GUEST_TSS_SEL 3
#define GUEST_GDTR_LIMIT64 (3 * 8 - 1)
static struct segment_descriptor i386_gdt[] = {
{}, /* NULL */
{ .sd_lolimit = 0xffff, .sd_type = SDT_MEMER, /* CODE */
.sd_p = 1, .sd_hilimit = 0xf, .sd_def32 = 1, .sd_gran = 1 },
{ .sd_lolimit = 0xffff, .sd_type = SDT_MEMRW, /* DATA */
.sd_p = 1, .sd_hilimit = 0xf, .sd_def32 = 1, .sd_gran = 1 },
{ .sd_lolimit = I386_TSS_SIZE - 1, /* TSS */
.sd_type = SDT_SYS386TSS, .sd_p = 1 }
};
/*
* Setup the 'vcpu' register set such that it will begin execution at
* 'eip' in flat mode.
*/
int
vm_setup_freebsd_registers_i386(struct vmctx *vmctx, int vcpu, uint32_t eip,
uint32_t gdtbase, uint32_t esp)
{
uint64_t cr0, rflags, desc_base;
uint32_t desc_access, desc_limit, tssbase;
uint16_t gsel;
struct segment_descriptor *gdt;
int error, tmp;
/* A 32-bit guest requires unrestricted mode. */
error = vm_get_capability(vmctx, vcpu, VM_CAP_UNRESTRICTED_GUEST, &tmp);
if (error)
goto done;
error = vm_set_capability(vmctx, vcpu, VM_CAP_UNRESTRICTED_GUEST, 1);
if (error)
goto done;
cr0 = CR0_PE | CR0_NE;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR0, cr0)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR4, 0)) != 0)
goto done;
/*
* Forcing EFER to 0 causes bhyve to clear the "IA-32e guest
* mode" entry control.
*/
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_EFER, 0)))
goto done;
gdt = vm_map_gpa(vmctx, gdtbase, 0x1000);
if (gdt == NULL)
return (EFAULT);
memcpy(gdt, i386_gdt, sizeof(i386_gdt));
desc_base = gdtbase;
desc_limit = sizeof(i386_gdt) - 1;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GDTR,
desc_base, desc_limit, 0);
if (error != 0)
goto done;
/* Place the TSS one page above the GDT. */
tssbase = gdtbase + 0x1000;
gdt[3].sd_lobase = tssbase;
rflags = 0x2;
error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RFLAGS, rflags);
if (error)
goto done;
desc_base = 0;
desc_limit = 0xffffffff;
desc_access = DESC_GRAN | DESC_DEF32 | DESC_PRESENT | SDT_MEMERA;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_CS,
desc_base, desc_limit, desc_access);
desc_access = DESC_GRAN | DESC_DEF32 | DESC_PRESENT | SDT_MEMRWA;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_DS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_ES,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_FS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_SS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
desc_base = tssbase;
desc_limit = I386_TSS_SIZE - 1;
desc_access = DESC_PRESENT | SDT_SYS386BSY;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_TR,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_LDTR, 0, 0,
DESC_UNUSABLE);
if (error)
goto done;
gsel = GSEL(GUEST_CODE_SEL, SEL_KPL);
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CS, gsel)) != 0)
goto done;
gsel = GSEL(GUEST_DATA_SEL, SEL_KPL);
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_DS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_ES, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_FS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_GS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_SS, gsel)) != 0)
goto done;
gsel = GSEL(GUEST_TSS_SEL, SEL_KPL);
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_TR, gsel)) != 0)
goto done;
/* LDTR is pointing to the null selector */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_LDTR, 0)) != 0)
goto done;
/* entry point */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RIP, eip)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RSP, esp)) != 0)
goto done;
error = 0;
done:
return (error);
}
void
vm_setup_freebsd_gdt(uint64_t *gdtr)
{
gdtr[GUEST_NULL_SEL] = 0;
gdtr[GUEST_CODE_SEL] = 0x0020980000000000;
gdtr[GUEST_DATA_SEL] = 0x0000900000000000;
}
/*
* Setup the 'vcpu' register set such that it will begin execution at
* 'rip' in long mode.
*/
int
vm_setup_freebsd_registers(struct vmctx *vmctx, int vcpu,
uint64_t rip, uint64_t cr3, uint64_t gdtbase,
uint64_t rsp)
{
int error;
uint64_t cr0, cr4, efer, rflags, desc_base;
uint32_t desc_access, desc_limit;
uint16_t gsel;
cr0 = CR0_PE | CR0_PG | CR0_NE;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR0, cr0)) != 0)
goto done;
cr4 = CR4_PAE;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR4, cr4)) != 0)
goto done;
efer = EFER_LME | EFER_LMA;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_EFER, efer)))
goto done;
rflags = 0x2;
error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RFLAGS, rflags);
if (error)
goto done;
desc_base = 0;
desc_limit = 0;
desc_access = 0x0000209B;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_CS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
desc_access = 0x00000093;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_DS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_ES,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_FS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_SS,
desc_base, desc_limit, desc_access);
if (error)
goto done;
/*
* XXX TR is pointing to null selector even though we set the
* TSS segment to be usable with a base address and limit of 0.
*/
desc_access = 0x0000008b;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_TR, 0, 0, desc_access);
if (error)
goto done;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_LDTR, 0, 0,
DESC_UNUSABLE);
if (error)
goto done;
gsel = GSEL(GUEST_CODE_SEL, SEL_KPL);
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CS, gsel)) != 0)
goto done;
gsel = GSEL(GUEST_DATA_SEL, SEL_KPL);
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_DS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_ES, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_FS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_GS, gsel)) != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_SS, gsel)) != 0)
goto done;
/* XXX TR is pointing to the null selector */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_TR, 0)) != 0)
goto done;
/* LDTR is pointing to the null selector */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_LDTR, 0)) != 0)
goto done;
/* entry point */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RIP, rip)) != 0)
goto done;
/* page table base */
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_CR3, cr3)) != 0)
goto done;
desc_base = gdtbase;
desc_limit = GUEST_GDTR_LIMIT64;
error = vm_set_desc(vmctx, vcpu, VM_REG_GUEST_GDTR,
desc_base, desc_limit, 0);
if (error != 0)
goto done;
if ((error = vm_set_register(vmctx, vcpu, VM_REG_GUEST_RSP, rsp)) != 0)
goto done;
error = 0;
done:
return (error);
}
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