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/*-
* Copyright (c) 2012 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/param.h>
#include <sys/types.h>
#include <machine/vmm.h>
#include <vmmapi.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "bhyverun.h"
#include "spinup_ap.h"
/*
* Trampoline for hypervisor direct 64-bit jump.
*
* 0 - signature for guest->host verification
* 8 - kernel virtual address of trampoline
* 16 - instruction virtual address
* 24 - stack pointer virtual address
* 32 - CR3, physical address of kernel page table
* 40 - 24-byte area for null/code/data GDT entries
*/
#define MP_V64T_SIG 0xcafebabecafebabeULL
struct mp_v64tramp {
uint64_t mt_sig;
uint64_t mt_virt;
uint64_t mt_eip;
uint64_t mt_rsp;
uint64_t mt_cr3;
uint64_t mt_gdtr[3];
};
static void
spinup_ap_realmode(struct vmctx *ctx, int newcpu, uint64_t *rip)
{
int vector, error;
uint16_t cs;
uint64_t desc_base;
uint32_t desc_limit, desc_access;
vector = *rip >> PAGE_SHIFT;
*rip = 0;
/*
* Update the %cs and %rip of the guest so that it starts
* executing real mode code at at 'vector << 12'.
*/
error = vm_set_register(ctx, newcpu, VM_REG_GUEST_RIP, *rip);
assert(error == 0);
error = vm_get_desc(ctx, newcpu, VM_REG_GUEST_CS, &desc_base,
&desc_limit, &desc_access);
assert(error == 0);
desc_base = vector << PAGE_SHIFT;
error = vm_set_desc(ctx, newcpu, VM_REG_GUEST_CS,
desc_base, desc_limit, desc_access);
assert(error == 0);
cs = (vector << PAGE_SHIFT) >> 4;
error = vm_set_register(ctx, newcpu, VM_REG_GUEST_CS, cs);
assert(error == 0);
}
static void
spinup_ap_direct64(struct vmctx *ctx, int newcpu, uint64_t *rip)
{
struct mp_v64tramp *mvt;
char *errstr;
int error;
uint64_t gdtbase;
mvt = paddr_guest2host(*rip);
assert(mvt->mt_sig == MP_V64T_SIG);
/*
* Set up the 3-entry GDT using memory supplied in the
* guest's trampoline structure.
*/
vm_setup_freebsd_gdt(mvt->mt_gdtr);
#define CHECK_ERROR(msg) \
if (error != 0) { \
errstr = msg; \
goto err_exit; \
}
/* entry point */
*rip = mvt->mt_eip;
/* Get the guest virtual address of the GDT */
gdtbase = mvt->mt_virt + __offsetof(struct mp_v64tramp, mt_gdtr);
error = vm_setup_freebsd_registers(ctx, newcpu, mvt->mt_eip,
mvt->mt_cr3, gdtbase, mvt->mt_rsp);
CHECK_ERROR("vm_setup_freebsd_registers");
return;
err_exit:
printf("spinup_ap_direct64: machine state error: %s", errstr);
exit(1);
}
int
spinup_ap(struct vmctx *ctx, int vcpu, int newcpu, uint64_t rip)
{
int error;
assert(newcpu != 0);
assert(newcpu < guest_ncpus);
error = vcpu_reset(ctx, newcpu);
assert(error == 0);
/* Set up capabilities */
if (fbsdrun_vmexit_on_hlt()) {
error = vm_set_capability(ctx, newcpu, VM_CAP_HALT_EXIT, 1);
assert(error == 0);
}
if (fbsdrun_vmexit_on_pause()) {
error = vm_set_capability(ctx, newcpu, VM_CAP_PAUSE_EXIT, 1);
assert(error == 0);
}
if (fbsdrun_disable_x2apic())
error = vm_set_x2apic_state(ctx, newcpu, X2APIC_DISABLED);
else
error = vm_set_x2apic_state(ctx, newcpu, X2APIC_ENABLED);
assert(error == 0);
/*
* There are 2 startup modes possible here:
* - if the CPU supports 'unrestricted guest' mode, the spinup can
* set up the processor state in power-on 16-bit mode, with the CS:IP
* init'd to the specified low-mem 4K page.
* - if the guest has requested a 64-bit trampoline in the low-mem 4K
* page by placing in the specified signature, set up the register
* state using register state in the signature. Note that this
* requires accessing guest physical memory to read the signature
* while 'unrestricted mode' does not.
*/
error = vm_set_capability(ctx, newcpu, VM_CAP_UNRESTRICTED_GUEST, 1);
if (error) {
spinup_ap_direct64(ctx, newcpu, &rip);
} else {
spinup_ap_realmode(ctx, newcpu, &rip);
}
fbsdrun_addcpu(ctx, newcpu, rip);
return (newcpu);
}
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