私はTTYで遊んでいますが、qemu-system-x86_64 -M pcそのオプションを渡すたびにLinuxなどのシリアル番号を-serial追加できる新しいTTYが作成されます。ttyS0ttyS1
ただし、ARMの場合、最初の項目を通過できませんttyAMA0。追加すると-serial表示されず、info qtreeカーネルブートメッセージは1つだけ検索されます。
9000000.pl011: ttyAMA0 at MMIO 0x9000000 (irq = 54, base_baud = 0) is a PL011 rev1
可能ですか？できない場合は特別な設計理由がありますか？
QEMU v3.0.0を使用しています。ソースでは不可能に見えます。https://github.com/qemu/qemu/blob/v3.0.0/hw/arm/virt.c#L138メモリマップにはUARTが1つしかないため：
[VIRT_GIC_REDIST] = { 0x080A0000, 0x00F60000 },
[VIRT_UART] = { 0x09000000, 0x00001000 },
[VIRT_RTC] = { 0x09010000, 0x00001000 },
別のシリアルから接続するとKGDBが動作しているか確認したかったのでこうしました。 x86_64では接続できますが、ttyS0ARMでは試してみる価値があると思います。また見なさい:https://stackoverflow.com/questions/22004616/how-to-debug-the-linux-kernel-with-qemu-and-kgdb/44197715#44197715
ベストアンサー1
これはqemu 4.0.1のvirtボード用のマルチシリアルポートサポートパッチです（公式のgitコミットはf9bec78です）。お楽しみください:-)
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index bf9c0bc..bdc7094 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -474,11 +474,11 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
}
static void
-build_spcr(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
+build_spcr(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms, int uart)
{
AcpiSerialPortConsoleRedirection *spcr;
- const MemMapEntry *uart_memmap = &vms->memmap[VIRT_UART];
- int irq = vms->irqmap[VIRT_UART] + ARM_SPI_BASE;
+ const MemMapEntry *uart_memmap = &vms->memmap[uart];
+ int irq = vms->irqmap[uart] + ARM_SPI_BASE;
int spcr_start = table_data->len;
spcr = acpi_data_push(table_data, sizeof(*spcr));
@@ -741,8 +741,14 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
*/
scope = aml_scope("\\_SB");
acpi_dsdt_add_cpus(scope, vms->smp_cpus);
- acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
- (irqmap[VIRT_UART] + ARM_SPI_BASE));
+ acpi_dsdt_add_uart(scope, &memmap[VIRT_UART0],
+ (irqmap[VIRT_UART0] + ARM_SPI_BASE));
+ acpi_dsdt_add_uart(scope, &memmap[VIRT_UART1],
+ (irqmap[VIRT_UART1] + ARM_SPI_BASE));
+ acpi_dsdt_add_uart(scope, &memmap[VIRT_UART2],
+ (irqmap[VIRT_UART2] + ARM_SPI_BASE));
+ acpi_dsdt_add_uart(scope, &memmap[VIRT_UART3],
+ (irqmap[VIRT_UART3] + ARM_SPI_BASE));
acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]);
acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
@@ -806,7 +812,16 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
build_mcfg(tables_blob, tables->linker, vms);
acpi_add_table(table_offsets, tables_blob);
- build_spcr(tables_blob, tables->linker, vms);
+ build_spcr(tables_blob, tables->linker, vms, VIRT_UART0);
+
+ acpi_add_table(table_offsets, tables_blob);
+ build_spcr(tables_blob, tables->linker, vms, VIRT_UART1);
+
+ acpi_add_table(table_offsets, tables_blob);
+ build_spcr(tables_blob, tables->linker, vms, VIRT_UART2);
+
+ acpi_add_table(table_offsets, tables_blob);
+ build_spcr(tables_blob, tables->linker, vms, VIRT_UART3);
if (nb_numa_nodes > 0) {
acpi_add_table(table_offsets, tables_blob);
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index ce2664a..e3006c6 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -125,12 +125,15 @@ static const MemMapEntry base_memmap[] = {
[VIRT_GIC_ITS] = { 0x08080000, 0x00020000 },
/* This redistributor space allows up to 2*64kB*123 CPUs */
[VIRT_GIC_REDIST] = { 0x080A0000, 0x00F60000 },
- [VIRT_UART] = { 0x09000000, 0x00001000 },
+ [VIRT_UART0] = { 0x09000000, 0x00001000 },
[VIRT_RTC] = { 0x09010000, 0x00001000 },
[VIRT_FW_CFG] = { 0x09020000, 0x00000018 },
[VIRT_GPIO] = { 0x09030000, 0x00001000 },
[VIRT_SECURE_UART] = { 0x09040000, 0x00001000 },
[VIRT_SMMU] = { 0x09050000, 0x00020000 },
+ [VIRT_UART1] = { 0x09080000, 0x00001000 },
+ [VIRT_UART2] = { 0x09090000, 0x00001000 },
+ [VIRT_UART3] = { 0x090a0000, 0x00001000 },
[VIRT_MMIO] = { 0x0a000000, 0x00000200 },
/* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
[VIRT_PLATFORM_BUS] = { 0x0c000000, 0x02000000 },
@@ -161,11 +164,14 @@ static MemMapEntry extended_memmap[] = {
};
static const int a15irqmap[] = {
- [VIRT_UART] = 1,
+ [VIRT_UART0] = 1,
[VIRT_RTC] = 2,
[VIRT_PCIE] = 3, /* ... to 6 */
[VIRT_GPIO] = 7,
[VIRT_SECURE_UART] = 8,
+ [VIRT_UART1] = 9,
+ [VIRT_UART2] = 10,
+ [VIRT_UART3] = 11,
[VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
[VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
[VIRT_SMMU] = 74, /* ...to 74 + NUM_SMMU_IRQS - 1 */
@@ -684,11 +690,16 @@ static void create_uart(const VirtMachineState *vms, qemu_irq *pic, int uart,
hwaddr base = vms->memmap[uart].base;
hwaddr size = vms->memmap[uart].size;
int irq = vms->irqmap[uart];
+
+ if(chr == NULL)
+ return;
+
const char compat[] = "arm,pl011\0arm,primecell";
const char clocknames[] = "uartclk\0apb_pclk";
+
DeviceState *dev = qdev_create(NULL, "pl011");
SysBusDevice *s = SYS_BUS_DEVICE(dev);
-
+
qdev_prop_set_chr(dev, "chardev", chr);
qdev_init_nofail(dev);
memory_region_add_subregion(mem, base,
@@ -710,9 +721,9 @@ static void create_uart(const VirtMachineState *vms, qemu_irq *pic, int uart,
qemu_fdt_setprop(vms->fdt, nodename, "clock-names",
clocknames, sizeof(clocknames));
- if (uart == VIRT_UART) {
+ if (uart == VIRT_UART0) {
qemu_fdt_setprop_string(vms->fdt, "/chosen", "stdout-path", nodename);
- } else {
+ } else if ((uart != VIRT_UART1) && (uart != VIRT_UART2) && (uart != VIRT_UART3)) {
/* Mark as not usable by the normal world */
qemu_fdt_setprop_string(vms->fdt, nodename, "status", "disabled");
qemu_fdt_setprop_string(vms->fdt, nodename, "secure-status", "okay");
@@ -1616,11 +1627,14 @@ static void machvirt_init(MachineState *machine)
fdt_add_pmu_nodes(vms);
- create_uart(vms, pic, VIRT_UART, sysmem, serial_hd(0));
+ create_uart(vms, pic, VIRT_UART0, sysmem, serial_hd(0));
+ create_uart(vms, pic, VIRT_UART1, sysmem, serial_hd(1));
+ create_uart(vms, pic, VIRT_UART2, sysmem, serial_hd(2));
+ create_uart(vms, pic, VIRT_UART3, sysmem, serial_hd(3));
if (vms->secure) {
create_secure_ram(vms, secure_sysmem);
- create_uart(vms, pic, VIRT_SECURE_UART, secure_sysmem, serial_hd(1));
+ create_uart(vms, pic, VIRT_SECURE_UART, secure_sysmem, serial_hd(4));
}
vms->highmem_ecam &= vms->highmem && (!firmware_loaded || aarch64);
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 507517c..5f6228f 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -65,7 +65,10 @@ enum {
VIRT_GIC_ITS,
VIRT_GIC_REDIST,
VIRT_SMMU,
- VIRT_UART,
+ VIRT_UART0,
+ VIRT_UART1,
+ VIRT_UART2,
+ VIRT_UART3,
VIRT_MMIO,
VIRT_RTC,
VIRT_FW_CFG,
構成と構築
./configure --enable-kvm --enable-sdl --enable-debug --enable-debug-stack-usage --target-list=aarch64-softmmu,arm-softmmu,x86_64-softmmu,i386-softmmu
make && make install
走る
qemu-system-aarch64 \
-cpu cortex-a57 \
-smp 16 \
-m 1G \
-machine virt,gic-version=3,virtualization=on \
-nographic \
-net nic,model=virtio,macaddr=fa:16:3e:4d:58:6f \
-net tap,ifname=tap-jh,script=vm-ifup,downscript=vm-ifdown \
-append "root=/dev/vda mem=768M console=ttyAMA0" \
-kernel arm64-vmlinux.img \
-initrd arm64-initrd.img \
-drive file=arm64-rootfs.img,format=raw,id=disk,if=none \
-device virtio-blk-device,drive=disk \
-monitor tcp::45459,server,nowait \
-serial tcp::45458,server,nowait \
-serial tcp::45457,server,nowait \
-serial tcp::45456,server,nowait \
-serial chardev:s0 -chardev stdio,id=s0,mux=on,logfile=qemu-s0.log,signal=off