freebsd-skq/usr.sbin/bhyve/mptbl.c
neel d89ccd0492 Don't allow MPtable generation if there are multiple PCI hierarchies. This is
because there isn't a standard way to relay this information to the guest OS.

Add a command line option "-Y" to bhyve(8) to inhibit MPtable generation.

If the virtual machine is using PCI devices on buses other than 0 then it can
still use ACPI tables to convey this information to the guest.

Discussed with:	grehan@
2014-05-02 04:51:31 +00:00

377 lines
9.4 KiB
C

/*-
* 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/types.h>
#include <sys/errno.h>
#include <x86/mptable.h>
#include <stdio.h>
#include <string.h>
#include "acpi.h"
#include "bhyverun.h"
#include "mptbl.h"
#include "pci_emul.h"
#define MPTABLE_BASE 0xF0000
/* floating pointer length + maximum length of configuration table */
#define MPTABLE_MAX_LENGTH (65536 + 16)
#define LAPIC_PADDR 0xFEE00000
#define LAPIC_VERSION 16
#define IOAPIC_PADDR 0xFEC00000
#define IOAPIC_VERSION 0x11
#define MP_SPECREV 4
#define MPFP_SIG "_MP_"
/* Configuration header defines */
#define MPCH_SIG "PCMP"
#define MPCH_OEMID "BHyVe "
#define MPCH_OEMID_LEN 8
#define MPCH_PRODID "Hypervisor "
#define MPCH_PRODID_LEN 12
/* Processor entry defines */
#define MPEP_SIG_FAMILY 6 /* XXX bhyve should supply this */
#define MPEP_SIG_MODEL 26
#define MPEP_SIG_STEPPING 5
#define MPEP_SIG \
((MPEP_SIG_FAMILY << 8) | \
(MPEP_SIG_MODEL << 4) | \
(MPEP_SIG_STEPPING))
#define MPEP_FEATURES (0xBFEBFBFF) /* XXX Intel i7 */
/* Number of local intr entries */
#define MPEII_NUM_LOCAL_IRQ 2
/* Bus entry defines */
#define MPE_NUM_BUSES 2
#define MPE_BUSNAME_LEN 6
#define MPE_BUSNAME_ISA "ISA "
#define MPE_BUSNAME_PCI "PCI "
static void *oem_tbl_start;
static int oem_tbl_size;
static uint8_t
mpt_compute_checksum(void *base, size_t len)
{
uint8_t *bytes;
uint8_t sum;
for(bytes = base, sum = 0; len > 0; len--) {
sum += *bytes++;
}
return (256 - sum);
}
static void
mpt_build_mpfp(mpfps_t mpfp, vm_paddr_t gpa)
{
memset(mpfp, 0, sizeof(*mpfp));
memcpy(mpfp->signature, MPFP_SIG, 4);
mpfp->pap = gpa + sizeof(*mpfp);
mpfp->length = 1;
mpfp->spec_rev = MP_SPECREV;
mpfp->checksum = mpt_compute_checksum(mpfp, sizeof(*mpfp));
}
static void
mpt_build_mpch(mpcth_t mpch)
{
memset(mpch, 0, sizeof(*mpch));
memcpy(mpch->signature, MPCH_SIG, 4);
mpch->spec_rev = MP_SPECREV;
memcpy(mpch->oem_id, MPCH_OEMID, MPCH_OEMID_LEN);
memcpy(mpch->product_id, MPCH_PRODID, MPCH_PRODID_LEN);
mpch->apic_address = LAPIC_PADDR;
}
static void
mpt_build_proc_entries(proc_entry_ptr mpep, int ncpu)
{
int i;
for (i = 0; i < ncpu; i++) {
memset(mpep, 0, sizeof(*mpep));
mpep->type = MPCT_ENTRY_PROCESSOR;
mpep->apic_id = i; // XXX
mpep->apic_version = LAPIC_VERSION;
mpep->cpu_flags = PROCENTRY_FLAG_EN;
if (i == 0)
mpep->cpu_flags |= PROCENTRY_FLAG_BP;
mpep->cpu_signature = MPEP_SIG;
mpep->feature_flags = MPEP_FEATURES;
mpep++;
}
}
static void
mpt_build_localint_entries(int_entry_ptr mpie)
{
/* Hardcode LINT0 as ExtINT on all CPUs. */
memset(mpie, 0, sizeof(*mpie));
mpie->type = MPCT_ENTRY_LOCAL_INT;
mpie->int_type = INTENTRY_TYPE_EXTINT;
mpie->int_flags = INTENTRY_FLAGS_POLARITY_CONFORM |
INTENTRY_FLAGS_TRIGGER_CONFORM;
mpie->dst_apic_id = 0xff;
mpie->dst_apic_int = 0;
mpie++;
/* Hardcode LINT1 as NMI on all CPUs. */
memset(mpie, 0, sizeof(*mpie));
mpie->type = MPCT_ENTRY_LOCAL_INT;
mpie->int_type = INTENTRY_TYPE_NMI;
mpie->int_flags = INTENTRY_FLAGS_POLARITY_CONFORM |
INTENTRY_FLAGS_TRIGGER_CONFORM;
mpie->dst_apic_id = 0xff;
mpie->dst_apic_int = 1;
}
static void
mpt_build_bus_entries(bus_entry_ptr mpeb)
{
memset(mpeb, 0, sizeof(*mpeb));
mpeb->type = MPCT_ENTRY_BUS;
mpeb->bus_id = 0;
memcpy(mpeb->bus_type, MPE_BUSNAME_PCI, MPE_BUSNAME_LEN);
mpeb++;
memset(mpeb, 0, sizeof(*mpeb));
mpeb->type = MPCT_ENTRY_BUS;
mpeb->bus_id = 1;
memcpy(mpeb->bus_type, MPE_BUSNAME_ISA, MPE_BUSNAME_LEN);
}
static void
mpt_build_ioapic_entries(io_apic_entry_ptr mpei, int id)
{
memset(mpei, 0, sizeof(*mpei));
mpei->type = MPCT_ENTRY_IOAPIC;
mpei->apic_id = id;
mpei->apic_version = IOAPIC_VERSION;
mpei->apic_flags = IOAPICENTRY_FLAG_EN;
mpei->apic_address = IOAPIC_PADDR;
}
static int
mpt_count_ioint_entries(void)
{
int bus, count;
count = 0;
for (bus = 0; bus <= PCI_BUSMAX; bus++)
count += pci_count_lintr(bus);
/*
* Always include entries for the first 16 pins along with a entry
* for each active PCI INTx pin.
*/
return (16 + count);
}
static void
mpt_generate_pci_int(int bus, int slot, int pin, int ioapic_irq, void *arg)
{
int_entry_ptr *mpiep, mpie;
mpiep = arg;
mpie = *mpiep;
memset(mpie, 0, sizeof(*mpie));
/*
* This is always after another I/O interrupt entry, so cheat
* and fetch the I/O APIC ID from the prior entry.
*/
mpie->type = MPCT_ENTRY_INT;
mpie->int_type = INTENTRY_TYPE_INT;
mpie->src_bus_id = bus;
mpie->src_bus_irq = slot << 2 | (pin - 1);
mpie->dst_apic_id = mpie[-1].dst_apic_id;
mpie->dst_apic_int = ioapic_irq;
*mpiep = mpie + 1;
}
static void
mpt_build_ioint_entries(int_entry_ptr mpie, int id)
{
int pin, bus;
/*
* The following config is taken from kernel mptable.c
* mptable_parse_default_config_ints(...), for now
* just use the default config, tweek later if needed.
*/
/* First, generate the first 16 pins. */
for (pin = 0; pin < 16; pin++) {
memset(mpie, 0, sizeof(*mpie));
mpie->type = MPCT_ENTRY_INT;
mpie->src_bus_id = 1;
mpie->dst_apic_id = id;
/*
* All default configs route IRQs from bus 0 to the first 16
* pins of the first I/O APIC with an APIC ID of 2.
*/
mpie->dst_apic_int = pin;
switch (pin) {
case 0:
/* Pin 0 is an ExtINT pin. */
mpie->int_type = INTENTRY_TYPE_EXTINT;
break;
case 2:
/* IRQ 0 is routed to pin 2. */
mpie->int_type = INTENTRY_TYPE_INT;
mpie->src_bus_irq = 0;
break;
case SCI_INT:
/* ACPI SCI is level triggered and active-lo. */
mpie->int_flags = INTENTRY_FLAGS_POLARITY_ACTIVELO |
INTENTRY_FLAGS_TRIGGER_LEVEL;
mpie->int_type = INTENTRY_TYPE_INT;
mpie->src_bus_irq = SCI_INT;
break;
default:
/* All other pins are identity mapped. */
mpie->int_type = INTENTRY_TYPE_INT;
mpie->src_bus_irq = pin;
break;
}
mpie++;
}
/* Next, generate entries for any PCI INTx interrupts. */
for (bus = 0; bus <= PCI_BUSMAX; bus++)
pci_walk_lintr(bus, mpt_generate_pci_int, &mpie);
}
void
mptable_add_oemtbl(void *tbl, int tblsz)
{
oem_tbl_start = tbl;
oem_tbl_size = tblsz;
}
int
mptable_build(struct vmctx *ctx, int ncpu)
{
mpcth_t mpch;
bus_entry_ptr mpeb;
io_apic_entry_ptr mpei;
proc_entry_ptr mpep;
mpfps_t mpfp;
int_entry_ptr mpie;
int ioints, bus;
char *curraddr;
char *startaddr;
startaddr = paddr_guest2host(ctx, MPTABLE_BASE, MPTABLE_MAX_LENGTH);
if (startaddr == NULL) {
fprintf(stderr, "mptable requires mapped mem\n");
return (ENOMEM);
}
/*
* There is no way to advertise multiple PCI hierarchies via MPtable
* so require that there is no PCI hierarchy with a non-zero bus
* number.
*/
for (bus = 1; bus <= PCI_BUSMAX; bus++) {
if (pci_bus_configured(bus)) {
fprintf(stderr, "MPtable is incompatible with "
"multiple PCI hierarchies.\r\n");
fprintf(stderr, "MPtable generation can be disabled "
"by passing the -Y option to bhyve(8).\r\n");
return (EINVAL);
}
}
curraddr = startaddr;
mpfp = (mpfps_t)curraddr;
mpt_build_mpfp(mpfp, MPTABLE_BASE);
curraddr += sizeof(*mpfp);
mpch = (mpcth_t)curraddr;
mpt_build_mpch(mpch);
curraddr += sizeof(*mpch);
mpep = (proc_entry_ptr)curraddr;
mpt_build_proc_entries(mpep, ncpu);
curraddr += sizeof(*mpep) * ncpu;
mpch->entry_count += ncpu;
mpeb = (bus_entry_ptr) curraddr;
mpt_build_bus_entries(mpeb);
curraddr += sizeof(*mpeb) * MPE_NUM_BUSES;
mpch->entry_count += MPE_NUM_BUSES;
mpei = (io_apic_entry_ptr)curraddr;
mpt_build_ioapic_entries(mpei, 0);
curraddr += sizeof(*mpei);
mpch->entry_count++;
mpie = (int_entry_ptr) curraddr;
ioints = mpt_count_ioint_entries();
mpt_build_ioint_entries(mpie, 0);
curraddr += sizeof(*mpie) * ioints;
mpch->entry_count += ioints;
mpie = (int_entry_ptr)curraddr;
mpt_build_localint_entries(mpie);
curraddr += sizeof(*mpie) * MPEII_NUM_LOCAL_IRQ;
mpch->entry_count += MPEII_NUM_LOCAL_IRQ;
if (oem_tbl_start) {
mpch->oem_table_pointer = curraddr - startaddr + MPTABLE_BASE;
mpch->oem_table_size = oem_tbl_size;
memcpy(curraddr, oem_tbl_start, oem_tbl_size);
}
mpch->base_table_length = curraddr - (char *)mpch;
mpch->checksum = mpt_compute_checksum(mpch, mpch->base_table_length);
return (0);
}