diff options
Diffstat (limited to 'lib/libvmmapi/amd64/vmmapi_freebsd_machdep.c')
| -rw-r--r-- | lib/libvmmapi/amd64/vmmapi_freebsd_machdep.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/lib/libvmmapi/amd64/vmmapi_freebsd_machdep.c b/lib/libvmmapi/amd64/vmmapi_freebsd_machdep.c new file mode 100644 index 000000000000..a1d39ac3795e --- /dev/null +++ b/lib/libvmmapi/amd64/vmmapi_freebsd_machdep.c @@ -0,0 +1,343 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * 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. + */ + +#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" +#include "internal.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 vcpu *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(vcpu, VM_CAP_UNRESTRICTED_GUEST, &tmp); + if (error) + goto done; + error = vm_set_capability(vcpu, VM_CAP_UNRESTRICTED_GUEST, 1); + if (error) + goto done; + + cr0 = CR0_PE | CR0_NE; + if ((error = vm_set_register(vcpu, VM_REG_GUEST_CR0, cr0)) != 0) + goto done; + + if ((error = vm_set_register(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(vcpu, VM_REG_GUEST_EFER, 0))) + goto done; + + gdt = vm_map_gpa(vcpu->ctx, 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(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(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(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(vcpu, VM_REG_GUEST_DS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_ES, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_FS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_GS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(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(vcpu, VM_REG_GUEST_TR, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + + error = vm_set_desc(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(vcpu, VM_REG_GUEST_CS, gsel)) != 0) + goto done; + + gsel = GSEL(GUEST_DATA_SEL, SEL_KPL); + if ((error = vm_set_register(vcpu, VM_REG_GUEST_DS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_ES, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_FS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_GS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_SS, gsel)) != 0) + goto done; + + gsel = GSEL(GUEST_TSS_SEL, SEL_KPL); + if ((error = vm_set_register(vcpu, VM_REG_GUEST_TR, gsel)) != 0) + goto done; + + /* LDTR is pointing to the null selector */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_LDTR, 0)) != 0) + goto done; + + /* entry point */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_RIP, eip)) != 0) + goto done; + + if ((error = vm_set_register(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 vcpu *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(vcpu, VM_REG_GUEST_CR0, cr0)) != 0) + goto done; + + cr4 = CR4_PAE; + if ((error = vm_set_register(vcpu, VM_REG_GUEST_CR4, cr4)) != 0) + goto done; + + efer = EFER_LME | EFER_LMA; + if ((error = vm_set_register(vcpu, VM_REG_GUEST_EFER, efer))) + goto done; + + rflags = 0x2; + error = vm_set_register(vcpu, VM_REG_GUEST_RFLAGS, rflags); + if (error) + goto done; + + desc_base = 0; + desc_limit = 0; + desc_access = 0x0000209B; + error = vm_set_desc(vcpu, VM_REG_GUEST_CS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + desc_access = 0x00000093; + error = vm_set_desc(vcpu, VM_REG_GUEST_DS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_ES, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_FS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(vcpu, VM_REG_GUEST_GS, + desc_base, desc_limit, desc_access); + if (error) + goto done; + + error = vm_set_desc(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(vcpu, VM_REG_GUEST_TR, 0, 0, desc_access); + if (error) + goto done; + + error = vm_set_desc(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(vcpu, VM_REG_GUEST_CS, gsel)) != 0) + goto done; + + gsel = GSEL(GUEST_DATA_SEL, SEL_KPL); + if ((error = vm_set_register(vcpu, VM_REG_GUEST_DS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_ES, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_FS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_GS, gsel)) != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_SS, gsel)) != 0) + goto done; + + /* XXX TR is pointing to the null selector */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_TR, 0)) != 0) + goto done; + + /* LDTR is pointing to the null selector */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_LDTR, 0)) != 0) + goto done; + + /* entry point */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_RIP, rip)) != 0) + goto done; + + /* page table base */ + if ((error = vm_set_register(vcpu, VM_REG_GUEST_CR3, cr3)) != 0) + goto done; + + desc_base = gdtbase; + desc_limit = GUEST_GDTR_LIMIT64; + error = vm_set_desc(vcpu, VM_REG_GUEST_GDTR, + desc_base, desc_limit, 0); + if (error != 0) + goto done; + + if ((error = vm_set_register(vcpu, VM_REG_GUEST_RSP, rsp)) != 0) + goto done; + + error = 0; +done: + return (error); +} |