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bhyve_hostif.c
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bhyve_hostif.c
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/*
* Bhyve host interface - VM allocation, mapping
* guest memory, populating guest register state etc
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <x86/segments.h>
#include <x86/specialreg.h>
#include <machine/vmm.h>
#include <vmmapi.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/i386/memory.h>
#include <grub/emu/bhyve.h>
#define GB (1024*1024*1024ULL)
#define DESC_UNUSABLE 0x00010000
#define GUEST_NULL_SEL 0
#define GUEST_CODE_SEL 2
#define GUEST_DATA_SEL 3
#define GUEST_TSS_SEL 4
#define GUEST_GDTR_LIMIT (5 * 8 - 1)
static uint16_t bhyve_gdt[] = {
0x0000, 0x0000, 0x0000, 0x0000, /* Null */
0x0000, 0x0000, 0x0000, 0x0000, /* Null #2 */
0xffff, 0x0000, 0x9a00, 0x00cf, /* code */
0xffff, 0x0000, 0x9200, 0x00cf, /* data */
0x0000, 0x0000, 0x8900, 0x0080 /* tss */
};
static struct vmctx *bhyve_ctx;
static int bhyve_cinsert = 1;
static int bhyve_vgainsert = 1;
static int bhyve_memwire = 0;
#define BHYVE_MAXSEGS 5
struct {
grub_uint64_t lomem, himem;
void *lomem_ptr, *himem_ptr;
} bhyve_g2h;
static struct grub_mmap_region bhyve_mm[BHYVE_MAXSEGS];
static struct grub_bhyve_info bhyve_info;
int
grub_emu_bhyve_init(const char *name, grub_uint64_t memsz)
{
int err;
int val;
grub_uint64_t lomemsz;
#ifdef VMMAPI_VERSION
int need_reinit = 0;
#endif
err = vm_create (name);
if (err != 0)
{
if (errno != EEXIST)
{
fprintf (stderr, "Could not create VM %s\n", name);
return GRUB_ERR_ACCESS_DENIED;
}
#ifdef VMMAPI_VERSION
need_reinit = 1;
#endif
}
bhyve_ctx = vm_open (name);
if (bhyve_ctx == NULL)
{
fprintf (stderr, "Could not open VM %s\n", name);
return GRUB_ERR_BUG;
}
#ifdef VMMAPI_VERSION
if (need_reinit)
{
err = vm_reinit (bhyve_ctx);
if (err != 0)
{
fprintf (stderr, "Could not reinit VM %s\n", name);
return GRUB_ERR_BUG;
}
}
#endif
val = 0;
err = vm_get_capability (bhyve_ctx, 0, VM_CAP_UNRESTRICTED_GUEST, &val);
if (err != 0)
{
fprintf (stderr, "VM unrestricted guest capability required\n");
return GRUB_ERR_BAD_DEVICE;
}
err = vm_set_capability (bhyve_ctx, 0, VM_CAP_UNRESTRICTED_GUEST, 1);
if (err != 0)
{
fprintf (stderr, "Could not enable unrestricted guest for VM\n");
return GRUB_ERR_BUG;
}
#ifdef VM_MEM_F_WIRED
if (bhyve_memwire)
{
vm_set_memflags(bhyve_ctx, VM_MEM_F_WIRED);
}
#endif
err = vm_setup_memory (bhyve_ctx, memsz, VM_MMAP_ALL);
if (err) {
fprintf (stderr, "Could not setup memory for VM\n");
return GRUB_ERR_OUT_OF_MEMORY;
}
lomemsz = vm_get_lowmem_limit(bhyve_ctx);
/*
* Extract the virtual address of the mapped guest memory.
*/
if (memsz >= lomemsz) {
bhyve_g2h.lomem = lomemsz;
bhyve_g2h.himem = memsz - lomemsz;
bhyve_g2h.himem_ptr = vm_map_gpa(bhyve_ctx, 4*GB, bhyve_g2h.himem);
} else {
bhyve_g2h.lomem = memsz;
bhyve_g2h.himem = 0;
}
bhyve_g2h.lomem_ptr = vm_map_gpa(bhyve_ctx, 0, bhyve_g2h.lomem);
/*
* bhyve is going to return the following memory segments
*
* 0 - 640K - usable
* 640K- 1MB - vga hole, BIOS, not usable.
* 1MB - lomem - usable
* lomem - 4G - not usable
* 4G - himem - usable [optional if himem != 0]
*/
bhyve_info.nsegs = 2;
bhyve_info.segs = bhyve_mm;
bhyve_mm[0].start = 0x0;
bhyve_mm[0].end = 640*1024; /* 640K */
bhyve_mm[0].type = GRUB_MEMORY_AVAILABLE;
bhyve_mm[1].start = 1024*1024;
bhyve_mm[1].end = (memsz > lomemsz) ? lomemsz : memsz;
bhyve_mm[1].type = GRUB_MEMORY_AVAILABLE;
if (memsz > lomemsz) {
bhyve_info.nsegs++;
bhyve_mm[2].start = 4*GB;
bhyve_mm[2].end = (memsz - lomemsz) + bhyve_mm[2].start;
bhyve_mm[2].type = GRUB_MEMORY_AVAILABLE;
}
/* The boot-code size is just the GDT that needs to be copied */
bhyve_info.bootsz = sizeof(bhyve_gdt);
return 0;
}
/*
* 32-bit boot state initialization. The Linux sequence appears to
* work fine for Net/OpenBSD kernel entry. Use the GP register state
* passed in, and copy other info to the allocated phys address, bt.
*/
void
grub_emu_bhyve_boot32(grub_uint32_t bt, struct grub_relocator32_state rs)
{
uint64_t cr0, cr4, rflags, desc_base;
uint32_t desc_access, desc_limit;
uint16_t gsel;
/*
* "At entry, the CPU must be in 32-bit protected mode with paging
* disabled;"
*/
cr0 = CR0_PE;
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_CR0, cr0) == 0);
cr4 = 0;
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_CR4, cr4) == 0);
/*
* Reserved bit 1 set to 1. "interrupt must be disabled"
*/
rflags = 0x2;
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RFLAGS, rflags) == 0);
/*
* "__BOOT_CS(0x10) and __BOOT_DS(0x18); both descriptors must be 4G
* flat segment; __BOOS_CS must have execute/read permission, and
* __BOOT_DS must have read/write permission; CS must be __BOOT_CS"
*/
desc_base = 0;
desc_limit = 0xffffffff;
desc_access = 0x0000C09B;
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_CS,
desc_base, desc_limit, desc_access) == 0);
desc_access = 0x0000C093;
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_DS,
desc_base, desc_limit, desc_access) == 0);
/*
* ... "and DS, ES, SS must be __BOOT_DS;"
*/
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_ES,
desc_base, desc_limit, desc_access) == 0);
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_FS,
desc_base, desc_limit, desc_access) == 0);
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_GS,
desc_base, desc_limit, desc_access) == 0);
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_SS,
desc_base, desc_limit, desc_access) == 0);
/*
* 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.
* Has to be 8b or vmenter will fail
*/
desc_access = 0x0000008b;
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_TR, 0x1000, 0x67,
desc_access) == 0);
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_LDTR, 0, 0xffff,
DESC_UNUSABLE | 0x82) == 0);
gsel = GSEL(GUEST_CODE_SEL, SEL_KPL);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_CS, gsel) == 0);
gsel = GSEL(GUEST_DATA_SEL, SEL_KPL);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_DS, gsel) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_ES, gsel) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_FS, gsel) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_GS, gsel) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_SS, gsel) == 0);
/* XXX TR is pointing to selector 1 */
gsel = GSEL(GUEST_TSS_SEL, SEL_KPL);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_TR, gsel) == 0);
/* LDTR is pointing to the null selector */
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_LDTR, 0) == 0);
/*
* "In 32-bit boot protocol, the kernel is started by jumping to the
* 32-bit kernel entry point, which is the start address of loaded
* 32/64-bit kernel."
*/
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RIP, rs.eip) == 0);
/*
* Set up the GDT by copying it into low memory, and then pointing
* the guest's GDT descriptor at it
*/
memcpy(grub_emu_bhyve_virt(bt), bhyve_gdt, sizeof(bhyve_gdt));
desc_base = bt;
desc_limit = GUEST_GDTR_LIMIT;
assert(vm_set_desc(bhyve_ctx, 0, VM_REG_GUEST_GDTR, desc_base,
desc_limit, 0) == 0);;
/*
* Set the stack to be just below the params real-mode area
*/
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RSP, rs.esp) == 0);
/*
* "%esi must hold the base address of the struct boot_params"
*/
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RSI, rs.esi) == 0);
/*
* "%ebp, %edi and %ebx must be zero."
* Assume that grub set these up correctly - might be different for
* *BSD. While at it, init the remaining passed-in register state.
*/
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RBP, rs.ebp) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RDI, rs.edi) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RBX, rs.ebx) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RAX, rs.eax) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RCX, rs.ecx) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RDX, rs.edx) == 0);
/*
* XXX debug: turn on tracing
*/
#if 0
assert(vm_set_capability(bhyve_ctx, 0, VM_CAP_MTRAP_EXIT, 1) == 0);
#endif
/*
* Exit cleanly, using the conditional test to avoid the noreturn
* warning.
*/
if (bt)
grub_reboot();
}
/*
* 64-bit boot state initilization. This is really only used for FreeBSD.
* It is assumed that the repeating 1GB page tables have already been
* setup. The bhyve library call does almost everything - remaining
* GP register state is set here
*/
void
grub_emu_bhyve_boot64(struct grub_relocator64_state rs)
{
uint64_t gdt64[3];
uint64_t gdt64_addr;
int error;
/*
* Set up the GDT by copying it to just below the top of low memory
* and point the guest's GDT descriptor at it
*/
gdt64_addr = bhyve_g2h.lomem - 2 * sizeof(gdt64);
vm_setup_freebsd_gdt(gdt64);
memcpy(grub_emu_bhyve_virt(gdt64_addr), gdt64, sizeof(gdt64));
/*
* Use the library API to set up a FreeBSD entry reg state
*/
error = vm_setup_freebsd_registers(bhyve_ctx, 0, rs.rip, rs.cr3,
gdt64_addr, rs.rsp);
assert(error == 0);
/* Set up the remaining regs */
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RAX, rs.rax) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RBX, rs.rbx) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RCX, rs.rcx) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RDX, rs.rdx) == 0);
assert(vm_set_register(bhyve_ctx, 0, VM_REG_GUEST_RSI, rs.rsi) == 0);
/*
* Exit cleanly, using the conditional test to avoid the noreturn
* warning.
*/
if (gdt64_addr)
grub_reboot();
}
const struct grub_bhyve_info *
grub_emu_bhyve_info(void)
{
return &bhyve_info;
}
void *
grub_emu_bhyve_virt(grub_uint64_t physaddr)
{
void *virt;
virt = NULL;
if (physaddr < bhyve_g2h.lomem)
virt = (char *)bhyve_g2h.lomem_ptr + physaddr;
else if (physaddr >= 4*GB && physaddr < (4*GB + bhyve_g2h.himem))
virt = (char *)bhyve_g2h.himem_ptr + (physaddr - 4*GB);
return (virt);
}
int
grub_emu_bhyve_parse_memsize(const char *arg, grub_uint64_t *size)
{
/*
* Assume size_t == uint64_t. Safe for amd64, which is the
* only platform grub-bhyve will ever run on.
*/
return (vm_parse_memsize(arg, size));
}
void
grub_emu_bhyve_unset_cinsert(void)
{
bhyve_cinsert = 0;
}
int
grub_emu_bhyve_cinsert(void)
{
return bhyve_cinsert;
}
void
grub_emu_bhyve_unset_vgainsert(void)
{
bhyve_vgainsert = 0;
}
int
grub_emu_bhyve_vgainsert(void)
{
return bhyve_vgainsert;
}
int
grub_emu_bhyve_memwire_avail(void)
{
#ifdef VM_MEM_F_WIRED
return (1);
#else
return (0);
#endif
}
void
grub_emu_bhyve_set_memwire(void)
{
#ifdef VM_MEM_F_WIRED
bhyve_memwire = 1;
#endif
}