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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

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* hw/i386: split isapc from PCI boards
* cpu-exec, accel: remove BQL usage for interrupt_request != 0
* memory, hpet, pmtimer: introduce BQL-free PIO/MMIO

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# gpg: Signature made Fri 29 Aug 2025 09:03:10 PM AEST
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [unknown]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [unknown]
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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (28 commits)
  tcg: move interrupt caching and single step masking closer to user
  kvm: i386: irqchip: take BQL only if there is an interrupt
  hpet: make main counter read lock-less
  hpet: move out main counter read into a separate block
  hpet: switch to fine-grained device locking
  acpi: mark PMTIMER as unlocked
  memory: reintroduce BQL-free fine-grained PIO/MMIO
  add cpu_test_interrupt()/cpu_set_interrupt() helpers and use them tree wide
  user-exec: ensure interrupt_request is not used
  hw/i386/isapc.c: replace rom_memory with system_memory
  hw/i386/pc_piix.c: replace rom_memory with pci_memory
  hw/i386/pc_piix.c: remove unused headers after isapc machine split
  hw/i386: move isapc machine to separate isapc.c file
  hw/i386/pc_piix.c: assume pcmc->pci_enabled is always true in pc_init1()
  hw/i386/pc_piix.c: always initialise ISA IDE drives in pc_init_isa()
  hw/i386/pc_piix.c: remove pc_system_flash_cleanup_unused() from pc_init_isa()
  hw/i386/pc_piix.c: hardcode hole64_size to 0 in pc_init_isa()
  hw/i386/pc_piix.c: simplify RAM size logic in pc_init_isa()
  hw/i386/pc_piix.c: remove nvdimm initialisation from pc_init_isa()
  hw/i386/pc_piix.c: remove SGX initialisation from pc_init_isa()
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
2025-08-31 09:08:09 +10:00
parent e101d33792 83bd8e65bc
commit 91589bcd9f
44 changed files with 490 additions and 319 deletions
Download Patch File Download Diff File Expand all files Collapse all files
accel/tcg/cpu-exec.c
+15 -16
View File
@@ -778,24 +778,20 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
*/
qatomic_set_mb(&cpu->neg.icount_decr.u16.high, 0);
if (unlikely(qatomic_read(&cpu->interrupt_request))) {
int interrupt_request;
#ifdef CONFIG_USER_ONLY
assert(!cpu_test_interrupt(cpu, ~0));
#else
if (unlikely(cpu_test_interrupt(cpu, ~0))) {
bql_lock();
interrupt_request = cpu->interrupt_request;
if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
/* Mask out external interrupts for this step. */
interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
}
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_DEBUG)) {
cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
cpu->exception_index = EXCP_DEBUG;
bql_unlock();
return true;
}
#if !defined(CONFIG_USER_ONLY)
if (replay_mode == REPLAY_MODE_PLAY && !replay_has_interrupt()) {
/* Do nothing */
} else if (interrupt_request & CPU_INTERRUPT_HALT) {
} else if (cpu_test_interrupt(cpu, CPU_INTERRUPT_HALT)) {
replay_interrupt();
cpu->interrupt_request &= ~CPU_INTERRUPT_HALT;
cpu->halted = 1;
@@ -804,14 +800,20 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
return true;
} else {
const TCGCPUOps *tcg_ops = cpu->cc->tcg_ops;
int interrupt_request = cpu->interrupt_request;
if (interrupt_request & CPU_INTERRUPT_RESET) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_RESET)) {
replay_interrupt();
tcg_ops->cpu_exec_reset(cpu);
bql_unlock();
return true;
}
if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
/* Mask out external interrupts for this step. */
interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
}
/*
* The target hook has 3 exit conditions:
* False when the interrupt isn't processed,
@@ -836,12 +838,8 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
cpu->exception_index = -1;
*last_tb = NULL;
}
/* The target hook may have updated the 'cpu->interrupt_request';
* reload the 'interrupt_request' value */
interrupt_request = cpu->interrupt_request;
}
#endif /* !CONFIG_USER_ONLY */
if (interrupt_request & CPU_INTERRUPT_EXITTB) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_EXITTB)) {
cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
/* ensure that no TB jump will be modified as
the program flow was changed */
@@ -851,6 +849,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
/* If we exit via cpu_loop_exit/longjmp it is reset in cpu_exec */
bql_unlock();
}
#endif /* !CONFIG_USER_ONLY */
/* Finally, check if we need to exit to the main loop. */
if (unlikely(qatomic_read(&cpu->exit_request)) || icount_exit_request(cpu)) {
accel/tcg/tcg-accel-ops.c
+1 -1
View File
@@ -97,7 +97,7 @@ static void tcg_cpu_reset_hold(CPUState *cpu)
/* mask must never be zero, except for A20 change call */
void tcg_handle_interrupt(CPUState *cpu, int mask)
{
cpu->interrupt_request |= mask;
cpu_set_interrupt(cpu, mask);
/*
* If called from iothread context, wake the target cpu in
accel/tcg/user-exec.c
+1 -3
View File
@@ -48,9 +48,7 @@ __thread uintptr_t helper_retaddr;
void cpu_interrupt(CPUState *cpu, int mask)
{
g_assert(bql_locked());
cpu->interrupt_request |= mask;
qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
g_assert_not_reached();
}
/*
hw/acpi/core.c
+1
View File
@@ -547,6 +547,7 @@ void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci,
ar->tmr.timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, acpi_pm_tmr_timer, ar);
memory_region_init_io(&ar->tmr.io, memory_region_owner(parent),
&acpi_pm_tmr_ops, ar, "acpi-tmr", 4);
memory_region_enable_lockless_io(&ar->tmr.io);
memory_region_add_subregion(parent, 8, &ar->tmr.io);
}
hw/i386/Kconfig
-3
View File
@@ -96,9 +96,6 @@ config ISAPC
select ISA_BUS
select PC
select IDE_ISA
# FIXME: it is in the same file as i440fx, and does not compile
# if separated
depends on I440FX
config Q35
bool
hw/i386/isapc.c
+189
View File
@@ -0,0 +1,189 @@
/*
* QEMU PC System Emulator
*
* Copyright (c) 2003-2004 Fabrice Bellard
*
* SPDX-License-Identifier: MIT
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "hw/char/parallel-isa.h"
#include "hw/dma/i8257.h"
#include "hw/i386/pc.h"
#include "hw/ide/isa.h"
#include "hw/ide/ide-bus.h"
#include "system/kvm.h"
#include "hw/i386/kvm/clock.h"
#include "hw/xen/xen-x86.h"
#include "system/xen.h"
#include "hw/rtc/mc146818rtc.h"
#include "target/i386/cpu.h"
static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 };
static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
static void pc_init_isa(MachineState *machine)
{
PCMachineState *pcms = PC_MACHINE(machine);
PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
X86MachineState *x86ms = X86_MACHINE(machine);
MemoryRegion *system_memory = get_system_memory();
MemoryRegion *system_io = get_system_io();
ISABus *isa_bus;
uint32_t irq;
GSIState *gsi_state;
MemoryRegion *ram_memory;
DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
int i;
/*
* There is a small chance that someone unintentionally passes "-cpu max"
* for the isapc machine, which will provide a much more modern 32-bit
* CPU than would be expected for an ISA-era PC. If the "max" cpu type has
* been specified, choose the "best" 32-bit cpu possible which we consider
* be the pentium3 (deliberately choosing an Intel CPU given that the
* default 486 CPU for the isapc machine is also an Intel CPU).
*/
if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("max"))) {
machine->cpu_type = X86_CPU_TYPE_NAME("pentium3");
warn_report("-cpu max is invalid for isapc machine, using pentium3");
}
/*
* Similarly if someone unintentionally passes "-cpu host" for the isapc
* machine then display a warning and also switch to the "best" 32-bit
* cpu possible which we consider to be the pentium3. This is because any
* host CPU will already be modern than this, but it also ensures any
* newer CPU flags/features are filtered out for older guests.
*/
if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("host"))) {
machine->cpu_type = X86_CPU_TYPE_NAME("pentium3");
warn_report("-cpu host is invalid for isapc machine, using pentium3");
}
if (machine->ram_size > 3.5 * GiB) {
error_report("Too much memory for this machine: %" PRId64 " MiB, "
"maximum 3584 MiB", machine->ram_size / MiB);
exit(1);
}
/*
* There is no RAM split for the isapc machine
*/
if (xen_enabled()) {
xen_hvm_init_pc(pcms, &ram_memory);
} else {
ram_memory = machine->ram;
pcms->max_ram_below_4g = 3.5 * GiB;
x86ms->above_4g_mem_size = 0;
x86ms->below_4g_mem_size = machine->ram_size;
}
x86_cpus_init(x86ms, pcmc->default_cpu_version);
if (kvm_enabled()) {
kvmclock_create(pcmc->kvmclock_create_always);
}
/* allocate ram and load rom/bios */
if (!xen_enabled()) {
pc_memory_init(pcms, system_memory, system_memory, 0);
} else {
assert(machine->ram_size == x86ms->below_4g_mem_size +
x86ms->above_4g_mem_size);
if (machine->kernel_filename != NULL) {
/* For xen HVM direct kernel boot, load linux here */
xen_load_linux(pcms);
}
}
gsi_state = pc_gsi_create(&x86ms->gsi, false);
isa_bus = isa_bus_new(NULL, system_memory, system_io,
&error_abort);
isa_bus_register_input_irqs(isa_bus, x86ms->gsi);
x86ms->rtc = isa_new(TYPE_MC146818_RTC);
qdev_prop_set_int32(DEVICE(x86ms->rtc), "base_year", 2000);
isa_realize_and_unref(x86ms->rtc, isa_bus, &error_fatal);
irq = object_property_get_uint(OBJECT(x86ms->rtc), "irq",
&error_fatal);
isa_connect_gpio_out(ISA_DEVICE(x86ms->rtc), 0, irq);
i8257_dma_init(OBJECT(machine), isa_bus, 0);
pcms->hpet_enabled = false;
if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
pc_i8259_create(isa_bus, gsi_state->i8259_irq);
}
if (tcg_enabled()) {
x86_register_ferr_irq(x86ms->gsi[13]);
}
pc_vga_init(isa_bus, NULL);
/* init basic PC hardware */
pc_basic_device_init(pcms, isa_bus, x86ms->gsi, x86ms->rtc,
!MACHINE_CLASS(pcmc)->no_floppy, 0x4);
pc_nic_init(pcmc, isa_bus, NULL);
ide_drive_get(hd, ARRAY_SIZE(hd));
for (i = 0; i < MAX_IDE_BUS; i++) {
ISADevice *dev;
char busname[] = "ide.0";
dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i],
ide_irq[i],
hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]);
/*
* The ide bus name is ide.0 for the first bus and ide.1 for the
* second one.
*/
busname[4] = '0' + i;
pcms->idebus[i] = qdev_get_child_bus(DEVICE(dev), busname);
}
}
static void isapc_machine_options(MachineClass *m)
{
static const char * const valid_cpu_types[] = {
X86_CPU_TYPE_NAME("486"),
X86_CPU_TYPE_NAME("athlon"),
X86_CPU_TYPE_NAME("kvm32"),
X86_CPU_TYPE_NAME("pentium"),
X86_CPU_TYPE_NAME("pentium2"),
X86_CPU_TYPE_NAME("pentium3"),
X86_CPU_TYPE_NAME("qemu32"),
X86_CPU_TYPE_NAME("max"),
X86_CPU_TYPE_NAME("host"),
NULL
};
PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
m->desc = "ISA-only PC";
m->max_cpus = 1;
m->option_rom_has_mr = true;
m->rom_file_has_mr = false;
pcmc->pci_enabled = false;
pcmc->has_acpi_build = false;
pcmc->smbios_defaults = false;
pcmc->gigabyte_align = false;
pcmc->smbios_legacy_mode = true;
pcmc->has_reserved_memory = false;
m->default_nic = "ne2k_isa";
m->default_cpu_type = X86_CPU_TYPE_NAME("486");
m->valid_cpu_types = valid_cpu_types;
m->no_floppy = !module_object_class_by_name(TYPE_ISA_FDC);
m->no_parallel = !module_object_class_by_name(TYPE_ISA_PARALLEL);
}
DEFINE_PC_MACHINE(isapc, "isapc", pc_init_isa,
isapc_machine_options);
hw/i386/meson.build
+1
View File
@@ -14,6 +14,7 @@ i386_ss.add(when: 'CONFIG_X86_IOMMU', if_true: files('x86-iommu.c'),
i386_ss.add(when: 'CONFIG_AMD_IOMMU', if_true: files('amd_iommu.c'),
if_false: files('amd_iommu-stub.c'))
i386_ss.add(when: 'CONFIG_I440FX', if_true: files('pc_piix.c'))
i386_ss.add(when: 'CONFIG_ISAPC', if_true: files('isapc.c'))
i386_ss.add(when: 'CONFIG_MICROVM', if_true: files('x86-common.c', 'microvm.c', 'acpi-microvm.c', 'microvm-dt.c'))
i386_ss.add(when: 'CONFIG_NITRO_ENCLAVE', if_true: files('nitro_enclave.c'))
i386_ss.add(when: 'CONFIG_Q35', if_true: files('pc_q35.c'))
hw/i386/pc_piix.c
+80 -168
View File
@@ -27,20 +27,16 @@
#include "qemu/units.h"
#include "hw/char/parallel-isa.h"
#include "hw/dma/i8257.h"
#include "hw/loader.h"
#include "hw/i386/x86.h"
#include "hw/i386/pc.h"
#include "hw/i386/apic.h"
#include "hw/pci-host/i440fx.h"
#include "hw/rtc/mc146818rtc.h"
#include "hw/southbridge/piix.h"
#include "hw/display/ramfb.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_ids.h"
#include "hw/usb.h"
#include "net/net.h"
#include "hw/ide/isa.h"
#include "hw/ide/pci.h"
#include "hw/irq.h"
#include "system/kvm.h"
@@ -72,12 +68,6 @@
#define XEN_IOAPIC_NUM_PIRQS 128ULL
#ifdef CONFIG_IDE_ISA
static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 };
static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
#endif
static GlobalProperty pc_piix_compat_defaults[] = {
{ TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
{ TYPE_VFIO_PCI_NOHOTPLUG, "use-legacy-x86-rom", "true" },
@@ -123,9 +113,13 @@ static void pc_init1(MachineState *machine, const char *pci_type)
GSIState *gsi_state;
MemoryRegion *ram_memory;
MemoryRegion *pci_memory = NULL;
MemoryRegion *rom_memory = system_memory;
ram_addr_t lowmem;
uint64_t hole64_size = 0;
PCIDevice *pci_dev;
DeviceState *dev;
size_t i;
assert(pcmc->pci_enabled);
/*
* Calculate ram split, for memory below and above 4G. It's a bit
@@ -196,42 +190,39 @@ static void pc_init1(MachineState *machine, const char *pci_type)
kvmclock_create(pcmc->kvmclock_create_always);
}
if (pcmc->pci_enabled) {
pci_memory = g_new(MemoryRegion, 1);
memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
rom_memory = pci_memory;
pci_memory = g_new(MemoryRegion, 1);
memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
phb = OBJECT(qdev_new(TYPE_I440FX_PCI_HOST_BRIDGE));
object_property_add_child(OBJECT(machine), "i440fx", phb);
object_property_set_link(phb, PCI_HOST_PROP_RAM_MEM,
OBJECT(ram_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_PCI_MEM,
OBJECT(pci_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_SYSTEM_MEM,
OBJECT(system_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_IO_MEM,
OBJECT(system_io), &error_fatal);
object_property_set_uint(phb, PCI_HOST_BELOW_4G_MEM_SIZE,
x86ms->below_4g_mem_size, &error_fatal);
object_property_set_uint(phb, PCI_HOST_ABOVE_4G_MEM_SIZE,
x86ms->above_4g_mem_size, &error_fatal);
object_property_set_str(phb, I440FX_HOST_PROP_PCI_TYPE, pci_type,
&error_fatal);
sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
phb = OBJECT(qdev_new(TYPE_I440FX_PCI_HOST_BRIDGE));
object_property_add_child(OBJECT(machine), "i440fx", phb);
object_property_set_link(phb, PCI_HOST_PROP_RAM_MEM,
OBJECT(ram_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_PCI_MEM,
OBJECT(pci_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_SYSTEM_MEM,
OBJECT(system_memory), &error_fatal);
object_property_set_link(phb, PCI_HOST_PROP_IO_MEM,
OBJECT(system_io), &error_fatal);
object_property_set_uint(phb, PCI_HOST_BELOW_4G_MEM_SIZE,
x86ms->below_4g_mem_size, &error_fatal);
object_property_set_uint(phb, PCI_HOST_ABOVE_4G_MEM_SIZE,
x86ms->above_4g_mem_size, &error_fatal);
object_property_set_str(phb, I440FX_HOST_PROP_PCI_TYPE, pci_type,
&error_fatal);
sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
pcms->pcibus = PCI_BUS(qdev_get_child_bus(DEVICE(phb), "pci.0"));
pci_bus_map_irqs(pcms->pcibus,
xen_enabled() ? xen_pci_slot_get_pirq
: pc_pci_slot_get_pirq);
pcms->pcibus = PCI_BUS(qdev_get_child_bus(DEVICE(phb), "pci.0"));
pci_bus_map_irqs(pcms->pcibus,
xen_enabled() ? xen_pci_slot_get_pirq
: pc_pci_slot_get_pirq);
hole64_size = object_property_get_uint(phb,
PCI_HOST_PROP_PCI_HOLE64_SIZE,
&error_abort);
}
hole64_size = object_property_get_uint(phb,
PCI_HOST_PROP_PCI_HOLE64_SIZE,
&error_abort);
/* allocate ram and load rom/bios */
if (!xen_enabled()) {
pc_memory_init(pcms, system_memory, rom_memory, hole64_size);
pc_memory_init(pcms, system_memory, pci_memory, hole64_size);
} else {
assert(machine->ram_size == x86ms->below_4g_mem_size +
x86ms->above_4g_mem_size);
@@ -243,72 +234,51 @@ static void pc_init1(MachineState *machine, const char *pci_type)
}
}
gsi_state = pc_gsi_create(&x86ms->gsi, pcmc->pci_enabled);
gsi_state = pc_gsi_create(&x86ms->gsi, true);
if (pcmc->pci_enabled) {
PCIDevice *pci_dev;
DeviceState *dev;
size_t i;
pci_dev = pci_new_multifunction(-1, pcms->south_bridge);
object_property_set_bool(OBJECT(pci_dev), "has-usb",
machine_usb(machine), &error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-acpi",
x86_machine_is_acpi_enabled(x86ms),
&error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-pic", false,
&error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-pit", false,
&error_abort);
qdev_prop_set_uint32(DEVICE(pci_dev), "smb_io_base", 0xb100);
object_property_set_bool(OBJECT(pci_dev), "smm-enabled",
x86_machine_is_smm_enabled(x86ms),
&error_abort);
dev = DEVICE(pci_dev);
for (i = 0; i < ISA_NUM_IRQS; i++) {
qdev_connect_gpio_out_named(dev, "isa-irqs", i, x86ms->gsi[i]);
}
pci_realize_and_unref(pci_dev, pcms->pcibus, &error_fatal);
if (xen_enabled()) {
pci_device_set_intx_routing_notifier(
pci_dev, piix_intx_routing_notifier_xen);
/*
* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also
* connected to the IOAPIC directly.
* These additional routes can be discovered through ACPI.
*/
pci_bus_irqs(pcms->pcibus, xen_intx_set_irq, pci_dev,
XEN_IOAPIC_NUM_PIRQS);
}
isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(pci_dev), "isa.0"));
x86ms->rtc = ISA_DEVICE(object_resolve_path_component(OBJECT(pci_dev),
"rtc"));
piix4_pm = object_resolve_path_component(OBJECT(pci_dev), "pm");
dev = DEVICE(object_resolve_path_component(OBJECT(pci_dev), "ide"));
pci_ide_create_devs(PCI_DEVICE(dev));
pcms->idebus[0] = qdev_get_child_bus(dev, "ide.0");
pcms->idebus[1] = qdev_get_child_bus(dev, "ide.1");
} else {
uint32_t irq;
isa_bus = isa_bus_new(NULL, system_memory, system_io,
&error_abort);
isa_bus_register_input_irqs(isa_bus, x86ms->gsi);
x86ms->rtc = isa_new(TYPE_MC146818_RTC);
qdev_prop_set_int32(DEVICE(x86ms->rtc), "base_year", 2000);
isa_realize_and_unref(x86ms->rtc, isa_bus, &error_fatal);
irq = object_property_get_uint(OBJECT(x86ms->rtc), "irq",
&error_fatal);
isa_connect_gpio_out(ISA_DEVICE(x86ms->rtc), 0, irq);
i8257_dma_init(OBJECT(machine), isa_bus, 0);
pcms->hpet_enabled = false;
pci_dev = pci_new_multifunction(-1, pcms->south_bridge);
object_property_set_bool(OBJECT(pci_dev), "has-usb",
machine_usb(machine), &error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-acpi",
x86_machine_is_acpi_enabled(x86ms),
&error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-pic", false,
&error_abort);
object_property_set_bool(OBJECT(pci_dev), "has-pit", false,
&error_abort);
qdev_prop_set_uint32(DEVICE(pci_dev), "smb_io_base", 0xb100);
object_property_set_bool(OBJECT(pci_dev), "smm-enabled",
x86_machine_is_smm_enabled(x86ms),
&error_abort);
dev = DEVICE(pci_dev);
for (i = 0; i < ISA_NUM_IRQS; i++) {
qdev_connect_gpio_out_named(dev, "isa-irqs", i, x86ms->gsi[i]);
}
pci_realize_and_unref(pci_dev, pcms->pcibus, &error_fatal);
if (xen_enabled()) {
pci_device_set_intx_routing_notifier(
pci_dev, piix_intx_routing_notifier_xen);
/*
* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also
* connected to the IOAPIC directly.
* These additional routes can be discovered through ACPI.
*/
pci_bus_irqs(pcms->pcibus, xen_intx_set_irq, pci_dev,
XEN_IOAPIC_NUM_PIRQS);
}
isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(pci_dev), "isa.0"));
x86ms->rtc = ISA_DEVICE(object_resolve_path_component(OBJECT(pci_dev),
"rtc"));
piix4_pm = object_resolve_path_component(OBJECT(pci_dev), "pm");
dev = DEVICE(object_resolve_path_component(OBJECT(pci_dev), "ide"));
pci_ide_create_devs(PCI_DEVICE(dev));
pcms->idebus[0] = qdev_get_child_bus(dev, "ide.0");
pcms->idebus[1] = qdev_get_child_bus(dev, "ide.1");
if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {
pc_i8259_create(isa_bus, gsi_state->i8259_irq);
@@ -322,7 +292,7 @@ static void pc_init1(MachineState *machine, const char *pci_type)
x86_register_ferr_irq(x86ms->gsi[13]);
}
pc_vga_init(isa_bus, pcmc->pci_enabled ? pcms->pcibus : NULL);
pc_vga_init(isa_bus, pcms->pcibus);
/* init basic PC hardware */
pc_basic_device_init(pcms, isa_bus, x86ms->gsi, x86ms->rtc,
@@ -330,28 +300,6 @@ static void pc_init1(MachineState *machine, const char *pci_type)
pc_nic_init(pcmc, isa_bus, pcms->pcibus);
#ifdef CONFIG_IDE_ISA
if (!pcmc->pci_enabled) {
DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
int i;
ide_drive_get(hd, ARRAY_SIZE(hd));
for (i = 0; i < MAX_IDE_BUS; i++) {
ISADevice *dev;
char busname[] = "ide.0";
dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i],
ide_irq[i],
hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]);
/*
* The ide bus name is ide.0 for the first bus and ide.1 for the
* second one.
*/
busname[4] = '0' + i;
pcms->idebus[i] = qdev_get_child_bus(DEVICE(dev), busname);
}
}
#endif
if (piix4_pm) {
smi_irq = qemu_allocate_irq(pc_acpi_smi_interrupt, first_cpu, 0);
@@ -433,22 +381,7 @@ static void pc_set_south_bridge(Object *obj, int value, Error **errp)
pcms->south_bridge = PCSouthBridgeOption_lookup.array[value];
}
#ifdef CONFIG_ISAPC
static void pc_init_isa(MachineState *machine)
{
pc_init1(machine, NULL);
}
#endif
#ifdef CONFIG_XEN
static void pc_xen_hvm_init_pci(MachineState *machine)
{
const char *pci_type = xen_igd_gfx_pt_enabled() ?
TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE : TYPE_I440FX_PCI_DEVICE;
pc_init1(machine, pci_type);
}
static void pc_xen_hvm_init(MachineState *machine)
{
PCMachineState *pcms = PC_MACHINE(machine);
@@ -458,7 +391,10 @@ static void pc_xen_hvm_init(MachineState *machine)
exit(1);
}
pc_xen_hvm_init_pci(machine);
pc_init1(machine, xen_igd_gfx_pt_enabled()
? TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE
: TYPE_I440FX_PCI_DEVICE);
xen_igd_reserve_slot(pcms->pcibus);
pci_create_simple(pcms->pcibus, -1, "xen-platform");
}
@@ -812,30 +748,6 @@ static void pc_i440fx_machine_2_6_options(MachineClass *m)
DEFINE_I440FX_MACHINE(2, 6);
#ifdef CONFIG_ISAPC
static void isapc_machine_options(MachineClass *m)
{
PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
m->desc = "ISA-only PC";
m->max_cpus = 1;
m->option_rom_has_mr = true;
m->rom_file_has_mr = false;
pcmc->pci_enabled = false;
pcmc->has_acpi_build = false;
pcmc->smbios_defaults = false;
pcmc->gigabyte_align = false;
pcmc->smbios_legacy_mode = true;
pcmc->has_reserved_memory = false;
m->default_nic = "ne2k_isa";
m->default_cpu_type = X86_CPU_TYPE_NAME("486");
m->no_floppy = !module_object_class_by_name(TYPE_ISA_FDC);
m->no_parallel = !module_object_class_by_name(TYPE_ISA_PARALLEL);
}
DEFINE_PC_MACHINE(isapc, "isapc", pc_init_isa,
isapc_machine_options);
#endif
#ifdef CONFIG_XEN
static void xenfv_machine_4_2_options(MachineClass *m)
{
hw/intc/s390_flic.c
+1 -1
View File
@@ -190,7 +190,7 @@ static void qemu_s390_flic_notify(uint32_t type)
CPU_FOREACH(cs) {
S390CPU *cpu = S390_CPU(cs);
cs->interrupt_request |= CPU_INTERRUPT_HARD;
cpu_set_interrupt(cs, CPU_INTERRUPT_HARD);
/* ignore CPUs that are not sleeping */
if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING &&
hw/openrisc/cputimer.c
+1 -1
View File
@@ -105,7 +105,7 @@ static void openrisc_timer_cb(void *opaque)
CPUState *cs = CPU(cpu);
cpu->env.ttmr |= TTMR_IP;
cs->interrupt_request |= CPU_INTERRUPT_TIMER;
cpu_set_interrupt(cs, CPU_INTERRUPT_TIMER);
}
switch (cpu->env.ttmr & TTMR_M) {
hw/timer/hpet.c
+30 -8
View File
@@ -38,6 +38,8 @@
#include "hw/timer/i8254.h"
#include "system/address-spaces.h"
#include "qom/object.h"
#include "qemu/lockable.h"
#include "qemu/seqlock.h"
#include "trace.h"
struct hpet_fw_config hpet_fw_cfg = {.count = UINT8_MAX};
@@ -69,9 +71,11 @@ struct HPETState {
SysBusDevice parent_obj;
/*< public >*/
QemuMutex lock;
MemoryRegion iomem;
uint64_t hpet_offset;
bool hpet_offset_saved;
QemuSeqLock state_version;
qemu_irq irqs[HPET_NUM_IRQ_ROUTES];
uint32_t flags;
uint8_t rtc_irq_level;
@@ -428,6 +432,25 @@ static uint64_t hpet_ram_read(void *opaque, hwaddr addr,
trace_hpet_ram_read(addr);
addr &= ~4;
if (addr == HPET_COUNTER) {
unsigned version;
/*
* Write update is rare, so busywait here is unlikely to happen
*/
do {
version = seqlock_read_begin(&s->state_version);
if (unlikely(!hpet_enabled(s))) {
cur_tick = s->hpet_counter;
} else {
cur_tick = hpet_get_ticks(s);
}
} while (seqlock_read_retry(&s->state_version, version));
trace_hpet_ram_read_reading_counter(addr & 4, cur_tick);
return cur_tick >> shift;
}
QEMU_LOCK_GUARD(&s->lock);
/*address range of all global regs*/
if (addr <= 0xff) {
switch (addr) {
@@ -435,14 +458,6 @@ static uint64_t hpet_ram_read(void *opaque, hwaddr addr,
return s->capability >> shift;
case HPET_CFG:
return s->config >> shift;
case HPET_COUNTER:
if (hpet_enabled(s)) {
cur_tick = hpet_get_ticks(s);
} else {
cur_tick = s->hpet_counter;
}
trace_hpet_ram_read_reading_counter(addr & 4, cur_tick);
return cur_tick >> shift;
case HPET_STATUS:
return s->isr >> shift;
default:
@@ -482,6 +497,7 @@ static void hpet_ram_write(void *opaque, hwaddr addr,
int len = MIN(size * 8, 64 - shift);
uint64_t old_val, new_val, cleared;
QEMU_LOCK_GUARD(&s->lock);
trace_hpet_ram_write(addr, value);
addr &= ~4;
@@ -494,6 +510,7 @@ static void hpet_ram_write(void *opaque, hwaddr addr,
old_val = s->config;
new_val = deposit64(old_val, shift, len, value);
new_val = hpet_fixup_reg(new_val, old_val, HPET_CFG_WRITE_MASK);
seqlock_write_begin(&s->state_version);
s->config = new_val;
if (activating_bit(old_val, new_val, HPET_CFG_ENABLE)) {
/* Enable main counter and interrupt generation. */
@@ -512,6 +529,8 @@ static void hpet_ram_write(void *opaque, hwaddr addr,
hpet_del_timer(&s->timer[i]);
}
}
seqlock_write_end(&s->state_version);
/* i8254 and RTC output pins are disabled
* when HPET is in legacy mode */
if (activating_bit(old_val, new_val, HPET_CFG_LEGACY)) {
@@ -679,8 +698,11 @@ static void hpet_init(Object *obj)
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
HPETState *s = HPET(obj);
qemu_mutex_init(&s->lock);
seqlock_init(&s->state_version);
/* HPET Area */
memory_region_init_io(&s->iomem, obj, &hpet_ram_ops, s, "hpet", HPET_LEN);
memory_region_enable_lockless_io(&s->iomem);
sysbus_init_mmio(sbd, &s->iomem);
}
include/hw/core/cpu.h
+23
View File
@@ -423,6 +423,7 @@ struct qemu_work_item;
* @created: Indicates whether the CPU thread has been successfully created.
* @halt_cond: condition variable sleeping threads can wait on.
* @interrupt_request: Indicates a pending interrupt request.
* Only used by system emulation.
* @halted: Nonzero if the CPU is in suspended state.
* @stop: Indicates a pending stop request.
* @stopped: Indicates the CPU has been artificially stopped.
@@ -942,6 +943,28 @@ CPUState *cpu_by_arch_id(int64_t id);
void cpu_interrupt(CPUState *cpu, int mask);
/**
* cpu_test_interrupt:
* @cpu: The CPU to check interrupt(s) on.
* @mask: The interrupts to check.
*
* Checks if any of interrupts in @mask are pending on @cpu.
*/
static inline bool cpu_test_interrupt(CPUState *cpu, int mask)
{
return qatomic_load_acquire(&cpu->interrupt_request) & mask;
}
/**
* cpu_set_interrupt:
* @cpu: The CPU to set pending interrupt(s) on.
* @mask: The interrupts to set.
*
* Sets interrupts in @mask as pending on @cpu. Unlike @cpu_interrupt,
* this does not kick the vCPU.
*/
void cpu_set_interrupt(CPUState *cpu, int mask);
/**
* cpu_set_pc:
* @cpu: The CPU to set the program counter for.
include/system/memory.h
+12
View File
@@ -833,6 +833,7 @@ struct MemoryRegion {
bool nonvolatile;
bool rom_device;
bool flush_coalesced_mmio;
bool lockless_io;
bool unmergeable;
uint8_t dirty_log_mask;
bool is_iommu;
@@ -2341,6 +2342,17 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr);
*/
void memory_region_clear_flush_coalesced(MemoryRegion *mr);
/**
* memory_region_enable_lockless_io: Enable lockless (BQL free) acceess.
*
* Enable BQL-free access for devices that are well prepared to handle
* locking during I/O themselves: either by doing fine grained locking or
* by providing lock-free I/O schemes.
*
* @mr: the memory region to be updated.
*/
void memory_region_enable_lockless_io(MemoryRegion *mr);
/**
* memory_region_add_eventfd: Request an eventfd to be triggered when a word
* is written to a location.
system/cpus.c
+8 -1
View File
@@ -254,9 +254,16 @@ int64_t cpus_get_elapsed_ticks(void)
return cpu_get_ticks();
}
void cpu_set_interrupt(CPUState *cpu, int mask)
{
/* Pairs with cpu_test_interrupt(). */
qatomic_store_release(&cpu->interrupt_request,
cpu->interrupt_request | mask);
}
void generic_handle_interrupt(CPUState *cpu, int mask)
{
cpu->interrupt_request |= mask;
cpu_set_interrupt(cpu, mask);
if (!qemu_cpu_is_self(cpu)) {
qemu_cpu_kick(cpu);
system/memory.c
+15
View File
@@ -2546,6 +2546,21 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr)
}
}
void memory_region_enable_lockless_io(MemoryRegion *mr)
{
mr->lockless_io = true;
/*
* reentrancy_guard has per device scope, that when enabled
* will effectively prevent concurrent access to device's IO
* MemoryRegion(s) by not calling accessor callback.
*
* Turn it off for lock-less IO enabled devices, to allow
* concurrent IO.
* TODO: remove this when reentrancy_guard becomes per transaction.
*/
mr->disable_reentrancy_guard = true;
}
void memory_region_add_eventfd(MemoryRegion *mr,
hwaddr addr,
unsigned size,
system/physmem.c
+1 -1
View File
@@ -2900,7 +2900,7 @@ bool prepare_mmio_access(MemoryRegion *mr)
{
bool release_lock = false;
if (!bql_locked()) {
if (!bql_locked() && !mr->lockless_io) {
bql_lock();
release_lock = true;
}
target/alpha/cpu.c
+4 -4
View File
@@ -86,10 +86,10 @@ static bool alpha_cpu_has_work(CPUState *cs)
assume that if a CPU really wants to stay asleep, it will mask
interrupts at the chipset level, which will prevent these bits
from being set in the first place. */
return cs->interrupt_request & (CPU_INTERRUPT_HARD
| CPU_INTERRUPT_TIMER
| CPU_INTERRUPT_SMP
| CPU_INTERRUPT_MCHK);
return cpu_test_interrupt(cs, CPU_INTERRUPT_HARD
| CPU_INTERRUPT_TIMER
| CPU_INTERRUPT_SMP
| CPU_INTERRUPT_MCHK);
}
#endif /* !CONFIG_USER_ONLY */
target/arm/cpu.c
+10 -10
View File
@@ -142,11 +142,11 @@ static bool arm_cpu_has_work(CPUState *cs)
ARMCPU *cpu = ARM_CPU(cs);
return (cpu->power_state != PSCI_OFF)
&& cs->interrupt_request &
(CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD
| CPU_INTERRUPT_NMI | CPU_INTERRUPT_VINMI | CPU_INTERRUPT_VFNMI
| CPU_INTERRUPT_VFIQ | CPU_INTERRUPT_VIRQ | CPU_INTERRUPT_VSERR
| CPU_INTERRUPT_EXITTB);
&& cpu_test_interrupt(cs,
CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD
| CPU_INTERRUPT_NMI | CPU_INTERRUPT_VINMI | CPU_INTERRUPT_VFNMI
| CPU_INTERRUPT_VFIQ | CPU_INTERRUPT_VIRQ | CPU_INTERRUPT_VSERR
| CPU_INTERRUPT_EXITTB);
}
#endif /* !CONFIG_USER_ONLY */
@@ -964,7 +964,7 @@ void arm_cpu_update_virq(ARMCPU *cpu)
!(arm_hcrx_el2_eff(env) & HCRX_VINMI)) ||
(env->irq_line_state & CPU_INTERRUPT_VIRQ);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VIRQ) != 0)) {
if (new_state != cpu_test_interrupt(cs, CPU_INTERRUPT_VIRQ)) {
if (new_state) {
cpu_interrupt(cs, CPU_INTERRUPT_VIRQ);
} else {
@@ -986,7 +986,7 @@ void arm_cpu_update_vfiq(ARMCPU *cpu)
!(arm_hcrx_el2_eff(env) & HCRX_VFNMI)) ||
(env->irq_line_state & CPU_INTERRUPT_VFIQ);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VFIQ) != 0)) {
if (new_state != cpu_test_interrupt(cs, CPU_INTERRUPT_VFIQ)) {
if (new_state) {
cpu_interrupt(cs, CPU_INTERRUPT_VFIQ);
} else {
@@ -1008,7 +1008,7 @@ void arm_cpu_update_vinmi(ARMCPU *cpu)
(arm_hcrx_el2_eff(env) & HCRX_VINMI)) ||
(env->irq_line_state & CPU_INTERRUPT_VINMI);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VINMI) != 0)) {
if (new_state != cpu_test_interrupt(cs, CPU_INTERRUPT_VINMI)) {
if (new_state) {
cpu_interrupt(cs, CPU_INTERRUPT_VINMI);
} else {
@@ -1028,7 +1028,7 @@ void arm_cpu_update_vfnmi(ARMCPU *cpu)
bool new_state = (arm_hcr_el2_eff(env) & HCR_VF) &&
(arm_hcrx_el2_eff(env) & HCRX_VFNMI);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VFNMI) != 0)) {
if (new_state != cpu_test_interrupt(cs, CPU_INTERRUPT_VFNMI)) {
if (new_state) {
cpu_interrupt(cs, CPU_INTERRUPT_VFNMI);
} else {
@@ -1047,7 +1047,7 @@ void arm_cpu_update_vserr(ARMCPU *cpu)
bool new_state = env->cp15.hcr_el2 & HCR_VSE;
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VSERR) != 0)) {
if (new_state != cpu_test_interrupt(cs, CPU_INTERRUPT_VSERR)) {
if (new_state) {
cpu_interrupt(cs, CPU_INTERRUPT_VSERR);
} else {
target/arm/helper.c
+9 -9
View File
@@ -839,40 +839,40 @@ static uint64_t isr_read(CPUARMState *env, const ARMCPRegInfo *ri)
uint64_t ret = 0;
if (hcr_el2 & HCR_IMO) {
if (cs->interrupt_request & CPU_INTERRUPT_VIRQ) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_VIRQ)) {
ret |= CPSR_I;
}
if (cs->interrupt_request & CPU_INTERRUPT_VINMI) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_VINMI)) {
ret |= ISR_IS;
ret |= CPSR_I;
}
} else {
if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_HARD)) {
ret |= CPSR_I;
}
if (cs->interrupt_request & CPU_INTERRUPT_NMI) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_NMI)) {
ret |= ISR_IS;
ret |= CPSR_I;
}
}
if (hcr_el2 & HCR_FMO) {
if (cs->interrupt_request & CPU_INTERRUPT_VFIQ) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_VFIQ)) {
ret |= CPSR_F;
}
if (cs->interrupt_request & CPU_INTERRUPT_VFNMI) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_VFNMI)) {
ret |= ISR_FS;
ret |= CPSR_F;
}
} else {
if (cs->interrupt_request & CPU_INTERRUPT_FIQ) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_FIQ)) {
ret |= CPSR_F;
}
}
if (hcr_el2 & HCR_AMO) {
if (cs->interrupt_request & CPU_INTERRUPT_VSERR) {
if (cpu_test_interrupt(cs, CPU_INTERRUPT_VSERR)) {
ret |= CPSR_A;
}
}
@@ -9301,7 +9301,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
arm_call_el_change_hook(cpu);
if (!kvm_enabled()) {
cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
cpu_set_interrupt(cs, CPU_INTERRUPT_EXITTB);
}
}
#endif /* !CONFIG_USER_ONLY */
target/arm/hvf/hvf.c
+3 -3
View File
@@ -1782,13 +1782,13 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
static int hvf_inject_interrupts(CPUState *cpu)
{
if (cpu->interrupt_request & CPU_INTERRUPT_FIQ) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_FIQ)) {
trace_hvf_inject_fiq();
hv_vcpu_set_pending_interrupt(cpu->accel->fd, HV_INTERRUPT_TYPE_FIQ,
true);
}
if (cpu->interrupt_request & CPU_INTERRUPT_HARD) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD)) {
trace_hvf_inject_irq();
hv_vcpu_set_pending_interrupt(cpu->accel->fd, HV_INTERRUPT_TYPE_IRQ,
true);
@@ -1840,7 +1840,7 @@ static void hvf_wfi(CPUState *cpu)
uint64_t nanos;
uint32_t cntfrq;
if (cpu->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIQ)) {
if (cpu_test_interrupt(cpu, CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIQ)) {
/* Interrupt pending, no need to wait */
return;
}

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