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