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