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qemu/hw/pci-host/q35.c
Philippe Mathieu-Daudé 9b0ca75e01 hw/pci-host/q35: Ignore write of reserved PCIEXBAR LENGTH field 
libFuzzer triggered the following assertion:

  cat << EOF | qemu-system-i386 -M pc-q35-5.0 \
    -nographic -monitor none -serial none \
    -qtest stdio -d guest_errors -trace pci\*
  outl 0xcf8 0xf2000060
  outl 0xcfc 0x8400056e
  EOF
  pci_cfg_write mch 00:0 @0x60 <- 0x8400056e
  Aborted (core dumped)

This is because guest wrote MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD
(reserved value) to the PCIE XBAR register.

There is no indication on the datasheet about what occurs when
this value is written. Simply ignore it on QEMU (and report an
guest error):

  pci_cfg_write mch 00:0 @0x60 <- 0x8400056e
  Q35: Reserved PCIEXBAR LENGTH
  pci_cfg_read mch 00:0 @0x0 -> 0x8086
  pci_cfg_read mch 00:0 @0x0 -> 0x29c08086
  ...

Cc: qemu-stable@nongnu.org
Reported-by: Alexander Bulekov <alxndr@bu.edu>
BugLink: https://bugs.launchpad.net/qemu/+bug/1878641
Fixes: df2d8b3ed4 ("q35: Introduce q35 pc based chipset emulator")
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210526142438.281477-1-f4bug@amsat.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-07-03 01:39:33 -04:00

720 lines
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/*
* QEMU MCH/ICH9 PCI Bridge Emulation
*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2009, 2010, 2011
* Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
*
* This is based on piix.c, but heavily modified.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/i386/pc.h"
#include "hw/pci-host/q35.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "qemu/module.h"
/****************************************************************************
* Q35 host
*/
#define Q35_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 35)
static void q35_host_realize(DeviceState *dev, Error **errp)
{
PCIHostState *pci = PCI_HOST_BRIDGE(dev);
Q35PCIHost *s = Q35_HOST_DEVICE(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, &pci->conf_mem);
sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_ADDR, 4);
sysbus_add_io(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, &pci->data_mem);
sysbus_init_ioports(sbd, MCH_HOST_BRIDGE_CONFIG_DATA, 4);
/* register q35 0xcf8 port as coalesced pio */
memory_region_set_flush_coalesced(&pci->data_mem);
memory_region_add_coalescing(&pci->conf_mem, 0, 4);
pci->bus = pci_root_bus_new(DEVICE(s), "pcie.0",
s->mch.pci_address_space,
s->mch.address_space_io,
0, TYPE_PCIE_BUS);
PC_MACHINE(qdev_get_machine())->bus = pci->bus;
qdev_realize(DEVICE(&s->mch), BUS(pci->bus), &error_fatal);
}
static const char *q35_host_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);
/* For backwards compat with old device paths */
if (s->mch.short_root_bus) {
return "0000";
}
return "0000:00";
}
static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
uint64_t val64;
uint32_t value;
val64 = range_is_empty(&s->mch.pci_hole)
? 0 : range_lob(&s->mch.pci_hole);
value = val64;
assert(value == val64);
visit_type_uint32(v, name, &value, errp);
}
static void q35_host_get_pci_hole_end(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
uint64_t val64;
uint32_t value;
val64 = range_is_empty(&s->mch.pci_hole)
? 0 : range_upb(&s->mch.pci_hole) + 1;
value = val64;
assert(value == val64);
visit_type_uint32(v, name, &value, errp);
}
/*
* The 64bit PCI hole start is set by the Guest firmware
* as the address of the first 64bit PCI MEM resource.
* If no PCI device has resources on the 64bit area,
* the 64bit PCI hole will start after "over 4G RAM" and the
* reserved space for memory hotplug if any.
*/
static uint64_t q35_host_get_pci_hole64_start_value(Object *obj)
{
PCIHostState *h = PCI_HOST_BRIDGE(obj);
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
Range w64;
uint64_t value;
pci_bus_get_w64_range(h->bus, &w64);
value = range_is_empty(&w64) ? 0 : range_lob(&w64);
if (!value && s->pci_hole64_fix) {
value = pc_pci_hole64_start();
}
return value;
}
static void q35_host_get_pci_hole64_start(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
uint64_t hole64_start = q35_host_get_pci_hole64_start_value(obj);
visit_type_uint64(v, name, &hole64_start, errp);
}
/*
* The 64bit PCI hole end is set by the Guest firmware
* as the address of the last 64bit PCI MEM resource.
* Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE
* that can be configured by the user.
*/
static void q35_host_get_pci_hole64_end(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
PCIHostState *h = PCI_HOST_BRIDGE(obj);
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
uint64_t hole64_start = q35_host_get_pci_hole64_start_value(obj);
Range w64;
uint64_t value, hole64_end;
pci_bus_get_w64_range(h->bus, &w64);
value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
hole64_end = ROUND_UP(hole64_start + s->mch.pci_hole64_size, 1ULL << 30);
if (s->pci_hole64_fix && value < hole64_end) {
value = hole64_end;
}
visit_type_uint64(v, name, &value, errp);
}
/*
* NOTE: setting defaults for the mch.* fields in this table
* doesn't work, because mch is a separate QOM object that is
* zeroed by the object_initialize(&s->mch, ...) call inside
* q35_host_initfn(). The default values for those
* properties need to be initialized manually by
* q35_host_initfn() after the object_initialize() call.
*/
static Property q35_host_props[] = {
DEFINE_PROP_UINT64(PCIE_HOST_MCFG_BASE, Q35PCIHost, parent_obj.base_addr,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),
DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,
mch.pci_hole64_size, Q35_PCI_HOST_HOLE64_SIZE_DEFAULT),
DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),
DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, Q35PCIHost,
mch.below_4g_mem_size, 0),
DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, Q35PCIHost,
mch.above_4g_mem_size, 0),
DEFINE_PROP_BOOL("x-pci-hole64-fix", Q35PCIHost, pci_hole64_fix, true),
DEFINE_PROP_END_OF_LIST(),
};
static void q35_host_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
hc->root_bus_path = q35_host_root_bus_path;
dc->realize = q35_host_realize;
device_class_set_props(dc, q35_host_props);
/* Reason: needs to be wired up by pc_q35_init */
dc->user_creatable = false;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->fw_name = "pci";
}
static void q35_host_initfn(Object *obj)
{
Q35PCIHost *s = Q35_HOST_DEVICE(obj);
PCIHostState *phb = PCI_HOST_BRIDGE(obj);
PCIExpressHost *pehb = PCIE_HOST_BRIDGE(obj);
memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb,
"pci-conf-idx", 4);
memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb,
"pci-conf-data", 4);
object_initialize_child(OBJECT(s), "mch", &s->mch, TYPE_MCH_PCI_DEVICE);
qdev_prop_set_int32(DEVICE(&s->mch), "addr", PCI_DEVFN(0, 0));
qdev_prop_set_bit(DEVICE(&s->mch), "multifunction", false);
/* mch's object_initialize resets the default value, set it again */
qdev_prop_set_uint64(DEVICE(s), PCI_HOST_PROP_PCI_HOLE64_SIZE,
Q35_PCI_HOST_HOLE64_SIZE_DEFAULT);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
q35_host_get_pci_hole_start,
NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
q35_host_get_pci_hole_end,
NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
q35_host_get_pci_hole64_start,
NULL, NULL, NULL);
object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
q35_host_get_pci_hole64_end,
NULL, NULL, NULL);
object_property_add_uint64_ptr(obj, PCIE_HOST_MCFG_SIZE,
&pehb->size, OBJ_PROP_FLAG_READ);
object_property_add_link(obj, MCH_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.ram_memory,
qdev_prop_allow_set_link_before_realize, 0);
object_property_add_link(obj, MCH_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.pci_address_space,
qdev_prop_allow_set_link_before_realize, 0);
object_property_add_link(obj, MCH_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.system_memory,
qdev_prop_allow_set_link_before_realize, 0);
object_property_add_link(obj, MCH_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION,
(Object **) &s->mch.address_space_io,
qdev_prop_allow_set_link_before_realize, 0);
}
static const TypeInfo q35_host_info = {
.name = TYPE_Q35_HOST_DEVICE,
.parent = TYPE_PCIE_HOST_BRIDGE,
.instance_size = sizeof(Q35PCIHost),
.instance_init = q35_host_initfn,
.class_init = q35_host_class_init,
};
/****************************************************************************
* MCH D0:F0
*/
static uint64_t blackhole_read(void *ptr, hwaddr reg, unsigned size)
{
return 0xffffffff;
}
static void blackhole_write(void *opaque, hwaddr addr, uint64_t val,
unsigned width)
{
/* nothing */
}
static const MemoryRegionOps blackhole_ops = {
.read = blackhole_read,
.write = blackhole_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 4,
.impl.max_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/* PCIe MMCFG */
static void mch_update_pciexbar(MCHPCIState *mch)
{
PCIDevice *pci_dev = PCI_DEVICE(mch);
BusState *bus = qdev_get_parent_bus(DEVICE(mch));
PCIExpressHost *pehb = PCIE_HOST_BRIDGE(bus->parent);
uint64_t pciexbar;
int enable;
uint64_t addr;
uint64_t addr_mask;
uint32_t length;
pciexbar = pci_get_quad(pci_dev->config + MCH_HOST_BRIDGE_PCIEXBAR);
enable = pciexbar & MCH_HOST_BRIDGE_PCIEXBAREN;
addr_mask = MCH_HOST_BRIDGE_PCIEXBAR_ADMSK;
switch (pciexbar & MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_MASK) {
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_256M:
length = 256 * 1024 * 1024;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_128M:
length = 128 * 1024 * 1024;
addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_128ADMSK |
MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_64M:
length = 64 * 1024 * 1024;
addr_mask |= MCH_HOST_BRIDGE_PCIEXBAR_64ADMSK;
break;
case MCH_HOST_BRIDGE_PCIEXBAR_LENGTH_RVD:
qemu_log_mask(LOG_GUEST_ERROR, "Q35: Reserved PCIEXBAR LENGTH\n");
return;
default:
abort();
}
addr = pciexbar & addr_mask;
pcie_host_mmcfg_update(pehb, enable, addr, length);
}
/* PAM */
static void mch_update_pam(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
int i;
memory_region_transaction_begin();
for (i = 0; i < 13; i++) {
pam_update(&mch->pam_regions[i], i,
pd->config[MCH_HOST_BRIDGE_PAM0 + DIV_ROUND_UP(i, 2)]);
}
memory_region_transaction_commit();
}
/* SMRAM */
static void mch_update_smram(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
uint32_t tseg_size;
/* implement SMRAM.D_LCK */
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
pd->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK_LCK;
pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK_LCK;
}
memory_region_transaction_begin();
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
/* Hide (!) low SMRAM if H_SMRAME = 1 */
memory_region_set_enabled(&mch->smram_region, h_smrame);
/* Show high SMRAM if H_SMRAME = 1 */
memory_region_set_enabled(&mch->open_high_smram, h_smrame);
} else {
/* Hide high SMRAM and low SMRAM */
memory_region_set_enabled(&mch->smram_region, true);
memory_region_set_enabled(&mch->open_high_smram, false);
}
if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_G_SMRAME) {
memory_region_set_enabled(&mch->low_smram, !h_smrame);
memory_region_set_enabled(&mch->high_smram, h_smrame);
} else {
memory_region_set_enabled(&mch->low_smram, false);
memory_region_set_enabled(&mch->high_smram, false);
}
if (pd->config[MCH_HOST_BRIDGE_ESMRAMC] & MCH_HOST_BRIDGE_ESMRAMC_T_EN) {
switch (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK) {
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_1MB:
tseg_size = 1024 * 1024;
break;
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_2MB:
tseg_size = 1024 * 1024 * 2;
break;
case MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_8MB:
tseg_size = 1024 * 1024 * 8;
break;
default:
tseg_size = 1024 * 1024 * (uint32_t)mch->ext_tseg_mbytes;
break;
}
} else {
tseg_size = 0;
}
memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
memory_region_set_size(&mch->tseg_blackhole, tseg_size);
memory_region_add_subregion_overlap(mch->system_memory,
mch->below_4g_mem_size - tseg_size,
&mch->tseg_blackhole, 1);
memory_region_set_enabled(&mch->tseg_window, tseg_size);
memory_region_set_size(&mch->tseg_window, tseg_size);
memory_region_set_address(&mch->tseg_window,
mch->below_4g_mem_size - tseg_size);
memory_region_set_alias_offset(&mch->tseg_window,
mch->below_4g_mem_size - tseg_size);
memory_region_transaction_commit();
}
static void mch_update_ext_tseg_mbytes(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
uint8_t *reg = pd->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES;
if (mch->ext_tseg_mbytes > 0 &&
pci_get_word(reg) == MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY) {
pci_set_word(reg, mch->ext_tseg_mbytes);
}
}
static void mch_update_smbase_smram(MCHPCIState *mch)
{
PCIDevice *pd = PCI_DEVICE(mch);
uint8_t *reg = pd->config + MCH_HOST_BRIDGE_F_SMBASE;
bool lck;
if (!mch->has_smram_at_smbase) {
return;
}
if (*reg == MCH_HOST_BRIDGE_F_SMBASE_QUERY) {
pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] =
MCH_HOST_BRIDGE_F_SMBASE_LCK;
*reg = MCH_HOST_BRIDGE_F_SMBASE_IN_RAM;
return;
}
/*
* default/reset state, discard written value
* which will disable SMRAM balackhole at SMBASE
*/
if (pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] == 0xff) {
*reg = 0x00;
}
memory_region_transaction_begin();
if (*reg & MCH_HOST_BRIDGE_F_SMBASE_LCK) {
/* disable all writes */
pd->wmask[MCH_HOST_BRIDGE_F_SMBASE] &=
~MCH_HOST_BRIDGE_F_SMBASE_LCK;
*reg = MCH_HOST_BRIDGE_F_SMBASE_LCK;
lck = true;
} else {
lck = false;
}
memory_region_set_enabled(&mch->smbase_blackhole, lck);
memory_region_set_enabled(&mch->smbase_window, lck);
memory_region_transaction_commit();
}
static void mch_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
MCHPCIState *mch = MCH_PCI_DEVICE(d);
pci_default_write_config(d, address, val, len);
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
MCH_HOST_BRIDGE_PAM_SIZE)) {
mch_update_pam(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PCIEXBAR,
MCH_HOST_BRIDGE_PCIEXBAR_SIZE)) {
mch_update_pciexbar(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_SMRAM,
MCH_HOST_BRIDGE_SMRAM_SIZE)) {
mch_update_smram(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_SIZE)) {
mch_update_ext_tseg_mbytes(mch);
}
if (ranges_overlap(address, len, MCH_HOST_BRIDGE_F_SMBASE, 1)) {
mch_update_smbase_smram(mch);
}
}
static void mch_update(MCHPCIState *mch)
{
mch_update_pciexbar(mch);
mch_update_pam(mch);
mch_update_smram(mch);
mch_update_ext_tseg_mbytes(mch);
mch_update_smbase_smram(mch);
/*
* pci hole goes from end-of-low-ram to io-apic.
* mmconfig will be excluded by the dsdt builder.
*/
range_set_bounds(&mch->pci_hole,
mch->below_4g_mem_size,
IO_APIC_DEFAULT_ADDRESS - 1);
}
static int mch_post_load(void *opaque, int version_id)
{
MCHPCIState *mch = opaque;
mch_update(mch);
return 0;
}
static const VMStateDescription vmstate_mch = {
.name = "mch",
.version_id = 1,
.minimum_version_id = 1,
.post_load = mch_post_load,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, MCHPCIState),
/* Used to be smm_enabled, which was basically always zero because
* SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code.
*/
VMSTATE_UNUSED(1),
VMSTATE_END_OF_LIST()
}
};
static void mch_reset(DeviceState *qdev)
{
PCIDevice *d = PCI_DEVICE(qdev);
MCHPCIState *mch = MCH_PCI_DEVICE(d);
pci_set_quad(d->config + MCH_HOST_BRIDGE_PCIEXBAR,
MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
d->config[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_DEFAULT;
d->wmask[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_WMASK;
d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = MCH_HOST_BRIDGE_ESMRAMC_WMASK;
if (mch->ext_tseg_mbytes > 0) {
pci_set_word(d->config + MCH_HOST_BRIDGE_EXT_TSEG_MBYTES,
MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_QUERY);
}
d->config[MCH_HOST_BRIDGE_F_SMBASE] = 0;
d->wmask[MCH_HOST_BRIDGE_F_SMBASE] = 0xff;
mch_update(mch);
}
static void mch_realize(PCIDevice *d, Error **errp)
{
int i;
MCHPCIState *mch = MCH_PCI_DEVICE(d);
if (mch->ext_tseg_mbytes > MCH_HOST_BRIDGE_EXT_TSEG_MBYTES_MAX) {
error_setg(errp, "invalid extended-tseg-mbytes value: %" PRIu16,
mch->ext_tseg_mbytes);
return;
}
/* setup pci memory mapping */
pc_pci_as_mapping_init(OBJECT(mch), mch->system_memory,
mch->pci_address_space);
/* if *disabled* show SMRAM to all CPUs */
memory_region_init_alias(&mch->smram_region, OBJECT(mch), "smram-region",
mch->pci_address_space, MCH_HOST_BRIDGE_SMRAM_C_BASE,
MCH_HOST_BRIDGE_SMRAM_C_SIZE);
memory_region_add_subregion_overlap(mch->system_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
&mch->smram_region, 1);
memory_region_set_enabled(&mch->smram_region, true);
memory_region_init_alias(&mch->open_high_smram, OBJECT(mch), "smram-open-high",
mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
MCH_HOST_BRIDGE_SMRAM_C_SIZE);
memory_region_add_subregion_overlap(mch->system_memory, 0xfeda0000,
&mch->open_high_smram, 1);
memory_region_set_enabled(&mch->open_high_smram, false);
/* smram, as seen by SMM CPUs */
memory_region_init(&mch->smram, OBJECT(mch), "smram", 4 * GiB);
memory_region_set_enabled(&mch->smram, true);
memory_region_init_alias(&mch->low_smram, OBJECT(mch), "smram-low",
mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
MCH_HOST_BRIDGE_SMRAM_C_SIZE);
memory_region_set_enabled(&mch->low_smram, true);
memory_region_add_subregion(&mch->smram, MCH_HOST_BRIDGE_SMRAM_C_BASE,
&mch->low_smram);
memory_region_init_alias(&mch->high_smram, OBJECT(mch), "smram-high",
mch->ram_memory, MCH_HOST_BRIDGE_SMRAM_C_BASE,
MCH_HOST_BRIDGE_SMRAM_C_SIZE);
memory_region_set_enabled(&mch->high_smram, true);
memory_region_add_subregion(&mch->smram, 0xfeda0000, &mch->high_smram);
memory_region_init_io(&mch->tseg_blackhole, OBJECT(mch),
&blackhole_ops, NULL,
"tseg-blackhole", 0);
memory_region_set_enabled(&mch->tseg_blackhole, false);
memory_region_add_subregion_overlap(mch->system_memory,
mch->below_4g_mem_size,
&mch->tseg_blackhole, 1);
memory_region_init_alias(&mch->tseg_window, OBJECT(mch), "tseg-window",
mch->ram_memory, mch->below_4g_mem_size, 0);
memory_region_set_enabled(&mch->tseg_window, false);
memory_region_add_subregion(&mch->smram, mch->below_4g_mem_size,
&mch->tseg_window);
/*
* This is not what hardware does, so it's QEMU specific hack.
* See commit message for details.
*/
memory_region_init_io(&mch->smbase_blackhole, OBJECT(mch), &blackhole_ops,
NULL, "smbase-blackhole",
MCH_HOST_BRIDGE_SMBASE_SIZE);
memory_region_set_enabled(&mch->smbase_blackhole, false);
memory_region_add_subregion_overlap(mch->system_memory,
MCH_HOST_BRIDGE_SMBASE_ADDR,
&mch->smbase_blackhole, 1);
memory_region_init_alias(&mch->smbase_window, OBJECT(mch),
"smbase-window", mch->ram_memory,
MCH_HOST_BRIDGE_SMBASE_ADDR,
MCH_HOST_BRIDGE_SMBASE_SIZE);
memory_region_set_enabled(&mch->smbase_window, false);
memory_region_add_subregion(&mch->smram, MCH_HOST_BRIDGE_SMBASE_ADDR,
&mch->smbase_window);
object_property_add_const_link(qdev_get_machine(), "smram",
OBJECT(&mch->smram));
init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
mch->pci_address_space, &mch->pam_regions[0],
PAM_BIOS_BASE, PAM_BIOS_SIZE);
for (i = 0; i < ARRAY_SIZE(mch->pam_regions) - 1; ++i) {
init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
mch->pci_address_space, &mch->pam_regions[i+1],
PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE);
}
}
uint64_t mch_mcfg_base(void)
{
bool ambiguous;
Object *o = object_resolve_path_type("", TYPE_MCH_PCI_DEVICE, &ambiguous);
if (!o) {
return 0;
}
return MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
}
static Property mch_props[] = {
DEFINE_PROP_UINT16("extended-tseg-mbytes", MCHPCIState, ext_tseg_mbytes,
16),
DEFINE_PROP_BOOL("smbase-smram", MCHPCIState, has_smram_at_smbase, true),
DEFINE_PROP_END_OF_LIST(),
};
static void mch_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
k->realize = mch_realize;
k->config_write = mch_write_config;
dc->reset = mch_reset;
device_class_set_props(dc, mch_props);
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->desc = "Host bridge";
dc->vmsd = &vmstate_mch;
k->vendor_id = PCI_VENDOR_ID_INTEL;
/*
* The 'q35' machine type implements an Intel Series 3 chipset,
* of which there are several variants. The key difference between
* the 82P35 MCH ('p35') and 82Q35 GMCH ('q35') variants is that
* the latter has an integrated graphics adapter. QEMU does not
* implement integrated graphics, so uses the PCI ID for the 82P35
* chipset.
*/
k->device_id = PCI_DEVICE_ID_INTEL_P35_MCH;
k->revision = MCH_HOST_BRIDGE_REVISION_DEFAULT;
k->class_id = PCI_CLASS_BRIDGE_HOST;
/*
* PCI-facing part of the host bridge, not usable without the
* host-facing part, which can't be device_add'ed, yet.
*/
dc->user_creatable = false;
}
static const TypeInfo mch_info = {
.name = TYPE_MCH_PCI_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(MCHPCIState),
.class_init = mch_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void q35_register(void)
{
type_register_static(&mch_info);
type_register_static(&q35_host_info);
}
type_init(q35_register);
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