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freebsd-dev/lib/libvmmapi/vmmapi_freebsd.c
John Baldwin 7d9ef309bd libvmmapi: Add a struct vcpu and use it in most APIs. 
This replaces the 'struct vm, int vcpuid' tuple passed to most API
calls and is similar to the changes recently made in vmm(4) in the
kernel.

struct vcpu is an opaque type managed by libvmmapi.  For now it stores
a pointer to the VM context and an integer id.

As an immediate effect this removes the divergence between the kernel
and userland for the instruction emulation code introduced by the
recent vmm(4) changes.

Since this is a major change to the vmmapi API, bump VMMAPI_VERSION to
0x200 (2.0) and the shared library major version.

While here (and since the major version is bumped), remove unused
vcpu argument from vm_setup_pptdev_msi*().

Add new functions vm_suspend_all_cpus() and vm_resume_all_cpus() for
use by the debug server.  The underyling ioctl (which uses a vcpuid of
-1) remains unchanged, but the userlevel API now uses separate
functions for global CPU suspend/resume.

Reviewed by:	corvink, markj
Differential Revision:	https://reviews.freebsd.org/D38124
2023-03-24 11:49:06 -07:00

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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"
#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);
}
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