Implement the emulation of PCI devices

Emulate the mechanism to access PCI config spaces on port
0xCF8/0xCFC. There is only a PCI functionality implemented,
which is mapping internal space to io space or mmio space through
BAR.

Each virtio-pci device has its own PCI config space and virtio config
space. The PCI config space can be registered to PCI bus by
pci_register_dev(). After the PCI device initialization, Guest Linux can
access the virtio config space. Our virtio-blk devices is based on
virtio-pci.

Without option "pci=conf1", the kernel doesn't find a PCI bus
and therefore also doesn't find the virtio-blk devices.

Makefile

@@ -18,7 +18,7 @@ else
     VECHO = @printf
 endif
 
-OBJS := vm.o serial.o main.o
+OBJS := vm.o serial.o main.o pci.o
 OBJS := $(addprefix $(OUT)/,$(OBJS))
 deps := $(OBJS:%.o=%.o.d)
 

configs/linux.config

@@ -1,6 +1,6 @@
-CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0"
+CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0"
 CONFIG_CC_IS_GCC=y
-CONFIG_GCC_VERSION=90300
+CONFIG_GCC_VERSION=90400
 CONFIG_CLANG_VERSION=0
 CONFIG_AS_IS_GNU=y
 CONFIG_AS_VERSION=23400
@@ -235,6 +235,7 @@ CONFIG_X86_MPPARSE=y
 # CONFIG_RETPOLINE is not set
 # CONFIG_X86_CPU_RESCTRL is not set
 # CONFIG_X86_EXTENDED_PLATFORM is not set
+# CONFIG_IOSF_MBI is not set
 # CONFIG_SCHED_OMIT_FRAME_POINTER is not set
 # CONFIG_HYPERVISOR_GUEST is not set
 # CONFIG_MK8 is not set
@@ -259,6 +260,7 @@ CONFIG_CPU_SUP_CENTAUR=y
 CONFIG_CPU_SUP_ZHAOXIN=y
 CONFIG_HPET_TIMER=y
 # CONFIG_DMI is not set
+# CONFIG_GART_IOMMU is not set
 CONFIG_NR_CPUS_RANGE_BEGIN=1
 CONFIG_NR_CPUS_RANGE_END=1
 CONFIG_NR_CPUS_DEFAULT=1
@@ -272,6 +274,9 @@ CONFIG_X86_IO_APIC=y
 #
 # Performance monitoring
 #
+# CONFIG_PERF_EVENTS_INTEL_UNCORE is not set
+# CONFIG_PERF_EVENTS_INTEL_RAPL is not set
+# CONFIG_PERF_EVENTS_INTEL_CSTATE is not set
 # CONFIG_PERF_EVENTS_AMD_POWER is not set
 # CONFIG_PERF_EVENTS_AMD_UNCORE is not set
 # end of Performance monitoring
@@ -343,8 +348,11 @@ CONFIG_ARCH_SUPPORTS_ACPI=y
 #
 # Bus options (PCI etc.)
 #
+CONFIG_PCI_DIRECT=y
+# CONFIG_PCI_CNB20LE_QUIRK is not set
 # CONFIG_ISA_BUS is not set
 # CONFIG_ISA_DMA_API is not set
+CONFIG_AMD_NB=y
 # end of Bus options (PCI etc.)
 
 #
@@ -546,8 +554,61 @@ CONFIG_ARCH_HAS_PTE_SPECIAL=y
 CONFIG_HAVE_EISA=y
 # CONFIG_EISA is not set
 CONFIG_HAVE_PCI=y
-# CONFIG_PCI is not set
+CONFIG_PCI=y
+CONFIG_PCI_DOMAINS=y
+# CONFIG_PCIEPORTBUS is not set
+# CONFIG_PCIEASPM is not set
+# CONFIG_PCIE_PTM is not set
+# CONFIG_PCI_MSI is not set
+# CONFIG_PCI_QUIRKS is not set
+# CONFIG_PCI_DEBUG is not set
+# CONFIG_PCI_STUB is not set
+CONFIG_PCI_LOCKLESS_CONFIG=y
+# CONFIG_PCI_IOV is not set
+# CONFIG_PCI_PRI is not set
+# CONFIG_PCI_PASID is not set
+# CONFIG_PCIE_BUS_TUNE_OFF is not set
+CONFIG_PCIE_BUS_DEFAULT=y
+# CONFIG_PCIE_BUS_SAFE is not set
+# CONFIG_PCIE_BUS_PERFORMANCE is not set
+# CONFIG_PCIE_BUS_PEER2PEER is not set
+# CONFIG_HOTPLUG_PCI is not set
+
+#
+# PCI controller drivers
+#
+
+#
+# DesignWare PCI Core Support
+#
+# end of DesignWare PCI Core Support
+
+#
+# Mobiveil PCIe Core Support
+#
+# end of Mobiveil PCIe Core Support
+
+#
+# Cadence PCIe controllers support
+#
+# end of Cadence PCIe controllers support
+# end of PCI controller drivers
+
+#
+# PCI Endpoint
+#
+# CONFIG_PCI_ENDPOINT is not set
+# end of PCI Endpoint
+
+#
+# PCI switch controller drivers
+#
+# CONFIG_PCI_SW_SWITCHTEC is not set
+# end of PCI switch controller drivers
+
+# CONFIG_CXL_BUS is not set
 # CONFIG_PCCARD is not set
+# CONFIG_RAPIDIO is not set
 
 #
 # Generic Driver Options
@@ -615,8 +676,14 @@ CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 # Misc devices
 #
 # CONFIG_DUMMY_IRQ is not set
+# CONFIG_IBM_ASM is not set
+# CONFIG_PHANTOM is not set
+# CONFIG_TIFM_CORE is not set
 # CONFIG_ENCLOSURE_SERVICES is not set
+# CONFIG_HP_ILO is not set
 # CONFIG_SRAM is not set
+# CONFIG_DW_XDATA_PCIE is not set
+# CONFIG_PCI_ENDPOINT_TEST is not set
 # CONFIG_XILINX_SDFEC is not set
 # CONFIG_C2PORT is not set
 
@@ -626,6 +693,8 @@ CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 # CONFIG_EEPROM_93CX6 is not set
 # end of EEPROM support
 
+# CONFIG_CB710_CORE is not set
+
 #
 # Texas Instruments shared transport line discipline
 #
@@ -634,7 +703,15 @@ CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 #
 # Altera FPGA firmware download module (requires I2C)
 #
+# CONFIG_INTEL_MEI is not set
+# CONFIG_INTEL_MEI_ME is not set
+# CONFIG_INTEL_MEI_TXE is not set
+# CONFIG_VMWARE_VMCI is not set
+# CONFIG_GENWQE is not set
 # CONFIG_ECHO is not set
+# CONFIG_MISC_ALCOR_PCI is not set
+# CONFIG_MISC_RTSX_PCI is not set
+# CONFIG_HABANA_AI is not set
 # CONFIG_PVPANIC is not set
 # end of Misc devices
 
@@ -644,6 +721,15 @@ CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 CONFIG_SCSI_MOD=y
 # end of SCSI device support
 
+# CONFIG_FUSION is not set
+
+#
+# IEEE 1394 (FireWire) support
+#
+# CONFIG_FIREWIRE is not set
+# CONFIG_FIREWIRE_NOSY is not set
+# end of IEEE 1394 (FireWire) support
+
 # CONFIG_MACINTOSH_DRIVERS is not set
 
 #
@@ -670,6 +756,7 @@ CONFIG_KEYBOARD_ATKBD=y
 # CONFIG_KEYBOARD_LKKBD is not set
 # CONFIG_KEYBOARD_NEWTON is not set
 # CONFIG_KEYBOARD_OPENCORES is not set
+# CONFIG_KEYBOARD_SAMSUNG is not set
 # CONFIG_KEYBOARD_STOWAWAY is not set
 # CONFIG_KEYBOARD_SUNKBD is not set
 # CONFIG_KEYBOARD_XTKBD is not set
@@ -701,6 +788,7 @@ CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
 CONFIG_SERIO_I8042=y
 CONFIG_SERIO_SERPORT=y
 # CONFIG_SERIO_CT82C710 is not set
+# CONFIG_SERIO_PCIPS2 is not set
 CONFIG_SERIO_LIBPS2=y
 # CONFIG_SERIO_RAW is not set
 # CONFIG_SERIO_ALTERA_PS2 is not set
@@ -734,40 +822,51 @@ CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
 # CONFIG_SERIAL_8250_16550A_VARIANTS is not set
 # CONFIG_SERIAL_8250_FINTEK is not set
 CONFIG_SERIAL_8250_CONSOLE=y
+# CONFIG_SERIAL_8250_PCI is not set
 CONFIG_SERIAL_8250_NR_UARTS=4
 CONFIG_SERIAL_8250_RUNTIME_UARTS=4
 # CONFIG_SERIAL_8250_EXTENDED is not set
 # CONFIG_SERIAL_8250_DW is not set
 # CONFIG_SERIAL_8250_RT288X is not set
+# CONFIG_SERIAL_8250_LPSS is not set
+# CONFIG_SERIAL_8250_MID is not set
 
 #
 # Non-8250 serial port support
 #
 # CONFIG_SERIAL_UARTLITE is not set
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
+# CONFIG_SERIAL_JSM is not set
 # CONFIG_SERIAL_LANTIQ is not set
 # CONFIG_SERIAL_SCCNXP is not set
+# CONFIG_SERIAL_BCM63XX is not set
 # CONFIG_SERIAL_ALTERA_JTAGUART is not set
 # CONFIG_SERIAL_ALTERA_UART is not set
 # CONFIG_SERIAL_ARC is not set
+# CONFIG_SERIAL_RP2 is not set
 # CONFIG_SERIAL_FSL_LPUART is not set
 # CONFIG_SERIAL_FSL_LINFLEXUART is not set
+# CONFIG_SERIAL_SPRD is not set
 # end of Serial drivers
 
 # CONFIG_SERIAL_NONSTANDARD is not set
+# CONFIG_NOZOMI is not set
 # CONFIG_NULL_TTY is not set
 # CONFIG_SERIAL_DEV_BUS is not set
 # CONFIG_TTY_PRINTK is not set
 # CONFIG_VIRTIO_CONSOLE is not set
 # CONFIG_IPMI_HANDLER is not set
 # CONFIG_HW_RANDOM is not set
+# CONFIG_APPLICOM is not set
 # CONFIG_MWAVE is not set
 # CONFIG_DEVMEM is not set
 # CONFIG_NVRAM is not set
+CONFIG_DEVPORT=y
 # CONFIG_HANGCHECK_TIMER is not set
 # CONFIG_TCG_TPM is not set
 # CONFIG_TELCLOCK is not set
+# CONFIG_XILLYBUS is not set
 # CONFIG_RANDOM_TRUST_BOOTLOADER is not set
 # end of Character devices
 
@@ -811,12 +910,20 @@ CONFIG_BCMA_POSSIBLE=y
 #
 # CONFIG_MFD_MADERA is not set
 # CONFIG_HTC_PASIC3 is not set
+# CONFIG_MFD_INTEL_QUARK_I2C_GPIO is not set
+# CONFIG_LPC_ICH is not set
+# CONFIG_LPC_SCH is not set
+# CONFIG_MFD_INTEL_LPSS_PCI is not set
+# CONFIG_MFD_INTEL_PMT is not set
+# CONFIG_MFD_JANZ_CMODIO is not set
 # CONFIG_MFD_KEMPLD is not set
 # CONFIG_MFD_MT6397 is not set
+# CONFIG_MFD_RDC321X is not set
 # CONFIG_MFD_SM501 is not set
 # CONFIG_MFD_SYSCON is not set
 # CONFIG_MFD_TI_AM335X_TSCADC is not set
 # CONFIG_MFD_TQMX86 is not set
+# CONFIG_MFD_VX855 is not set
 # end of Multifunction device drivers
 
 # CONFIG_REGULATOR is not set
@@ -833,6 +940,8 @@ CONFIG_BCMA_POSSIBLE=y
 #
 # Graphics support
 #
+# CONFIG_AGP is not set
+# CONFIG_VGA_ARB is not set
 # CONFIG_DRM is not set
 # CONFIG_DRM_DEBUG_MODESET_LOCK is not set
 
@@ -941,6 +1050,18 @@ CONFIG_HID_GENERIC=y
 # CONFIG_HID_SENSOR_HUB is not set
 # CONFIG_HID_ALPS is not set
 # end of Special HID drivers
+
+#
+# Intel ISH HID support
+#
+# CONFIG_INTEL_ISH_HID is not set
+# end of Intel ISH HID support
+
+#
+# AMD SFH HID Support
+#
+# CONFIG_AMD_SFH_HID is not set
+# end of AMD SFH HID Support
 # end of HID support
 
 CONFIG_USB_OHCI_LITTLE_ENDIAN=y
@@ -979,9 +1100,13 @@ CONFIG_RTC_MC146818_LIB=y
 # CONFIG_COMEDI is not set
 # CONFIG_STAGING is not set
 # CONFIG_X86_PLATFORM_DEVICES is not set
+CONFIG_PMC_ATOM=y
 # CONFIG_CHROME_PLATFORMS is not set
 # CONFIG_MELLANOX_PLATFORM is not set
-# CONFIG_COMMON_CLK is not set
+CONFIG_HAVE_CLK=y
+CONFIG_HAVE_CLK_PREPARE=y
+CONFIG_COMMON_CLK=y
+# CONFIG_XILINX_VCU is not set
 # CONFIG_HWSPINLOCK is not set
 
 #
@@ -1052,6 +1177,8 @@ CONFIG_CLKBLD_I8253=y
 # CONFIG_EXTCON is not set
 # CONFIG_MEMORY is not set
 # CONFIG_IIO is not set
+# CONFIG_NTB is not set
+# CONFIG_VME_BUS is not set
 # CONFIG_PWM is not set
 
 #
@@ -1088,6 +1215,7 @@ CONFIG_CLKBLD_I8253=y
 # end of Performance monitor support
 
 # CONFIG_RAS is not set
+# CONFIG_USB4 is not set
 
 #
 # Android
@@ -1195,6 +1323,7 @@ CONFIG_GENERIC_STRNLEN_USER=y
 CONFIG_GENERIC_FIND_FIRST_BIT=y
 # CONFIG_CORDIC is not set
 # CONFIG_PRIME_NUMBERS is not set
+CONFIG_RATIONAL=y
 CONFIG_GENERIC_PCI_IOMAP=y
 CONFIG_GENERIC_IOMAP=y
 CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
@@ -1396,6 +1525,7 @@ CONFIG_HAVE_OBJTOOL_MCOUNT=y
 CONFIG_HAVE_C_RECORDMCOUNT=y
 CONFIG_TRACING_SUPPORT=y
 # CONFIG_FTRACE is not set
+# CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set
 # CONFIG_SAMPLES is not set
 CONFIG_HAVE_SAMPLE_FTRACE_DIRECT=y
 CONFIG_HAVE_SAMPLE_FTRACE_DIRECT_MULTI=y
@@ -1418,6 +1548,7 @@ CONFIG_IO_DELAY_0X80=y
 # CONFIG_DEBUG_ENTRY is not set
 # CONFIG_DEBUG_NMI_SELFTEST is not set
 # CONFIG_X86_DEBUG_FPU is not set
+# CONFIG_PUNIT_ATOM_DEBUG is not set
 # CONFIG_UNWINDER_ORC is not set
 # CONFIG_UNWINDER_FRAME_POINTER is not set
 CONFIG_UNWINDER_GUESS=y