From: Igor Mammedov <imammedo@redhat.com>
load_dtb() depends on arm_load_kernel() to figure out place
in RAM where it should be loaded, but it's not required for
arm_load_kernel() to work. Sometimes it's neccesary for
devices added with -device/device_add to be enumerated in
DTB as well, which's lead to [1] and surrounding commits to
add 2 more machine_done notifiers with non obvious ordering
to make dynamic sysbus devices initialization happen in
the right order.
However instead of moving whole arm_load_kernel() in to
machine_done, it's sufficient to move only load_dtb() into
virt_machine_done() notifier and remove ArmLoadKernelNotifier/
/PlatformBusFDTNotifierParams notifiers, which saves us ~90LOC
and simplifies code flow quite a bit.
Later would allow to consolidate DTB generation within one
function for 'mach-virt' board and make it reentrant so it
could generate updated DTB in device hotplug secenarios.
While at it rename load_dtb() to arm_load_dtb() since it's
public now.
Add additional field skip_dtb_autoload to struct arm_boot_info
to allow manual DTB load later in mach-virt and to avoid touching
all other boards to explicitly call arm_load_dtb().
1) (ac9d32e hw/arm/boot: arm_load_kernel implemented as a machine init done notifier)
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1525691524-32265-4-git-send-email-imammedo@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
include/hw/arm/arm.h | 45 +++++++++++++++++------
include/hw/arm/sysbus-fdt.h | 37 ++++---------------
hw/arm/boot.c | 72 ++++++++++---------------------------
hw/arm/sysbus-fdt.c | 61 +++----------------------------
hw/arm/virt.c | 64 ++++++++++++++++-----------------
5 files changed, 94 insertions(+), 185 deletions(-)
diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h
index ce769bde6a..70fa2287e2 100644
--- a/include/hw/arm/arm.h
+++ b/include/hw/arm/arm.h
@@ -39,15 +39,6 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
*/
void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size);
-/*
- * struct used as a parameter of the arm_load_kernel machine init
- * done notifier
- */
-typedef struct {
- Notifier notifier; /* actual notifier */
- ARMCPU *cpu; /* handle to the first cpu object */
-} ArmLoadKernelNotifier;
-
/* arm_boot.c */
struct arm_boot_info {
uint64_t ram_size;
@@ -56,6 +47,13 @@ struct arm_boot_info {
const char *initrd_filename;
const char *dtb_filename;
hwaddr loader_start;
+ hwaddr dtb_start;
+ hwaddr dtb_limit;
+ /* If set to True, arm_load_kernel() will not load DTB.
+ * It allows board to load DTB manually later.
+ * (default: False)
+ */
+ bool skip_dtb_autoload;
/* multicore boards that use the default secondary core boot functions
* need to put the address of the secondary boot code, the boot reg,
* and the GIC address in the next 3 values, respectively. boards that
@@ -94,8 +92,6 @@ struct arm_boot_info {
* the user it should implement this hook.
*/
void (*modify_dtb)(const struct arm_boot_info *info, void *fdt);
- /* machine init done notifier executing arm_load_dtb */
- ArmLoadKernelNotifier load_kernel_notifier;
/* Used internally by arm_boot.c */
int is_linux;
hwaddr initrd_start;
@@ -143,6 +139,33 @@ struct arm_boot_info {
*/
void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info);
+AddressSpace *arm_boot_address_space(ARMCPU *cpu,
+ const struct arm_boot_info *info);
+
+/**
+ * arm_load_dtb() - load a device tree binary image into memory
+ * @addr: the address to load the image at
+ * @binfo: struct describing the boot environment
+ * @addr_limit: upper limit of the available memory area at @addr
+ * @as: address space to load image to
+ *
+ * Load a device tree supplied by the machine or by the user with the
+ * '-dtb' command line option, and put it at offset @addr in target
+ * memory.
+ *
+ * If @addr_limit contains a meaningful value (i.e., it is strictly greater
+ * than @addr), the device tree is only loaded if its size does not exceed
+ * the limit.
+ *
+ * Returns: the size of the device tree image on success,
+ * 0 if the image size exceeds the limit,
+ * -1 on errors.
+ *
+ * Note: Must not be called unless have_dtb(binfo) is true.
+ */
+int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
+ hwaddr addr_limit, AddressSpace *as);
+
/* Write a secure board setup routine with a dummy handler for SMCs */
void arm_write_secure_board_setup_dummy_smc(ARMCPU *cpu,
const struct arm_boot_info *info,
diff --git a/include/hw/arm/sysbus-fdt.h b/include/hw/arm/sysbus-fdt.h
index e15bb81807..340c382cdd 100644
--- a/include/hw/arm/sysbus-fdt.h
+++ b/include/hw/arm/sysbus-fdt.h
@@ -24,37 +24,14 @@
#ifndef HW_ARM_SYSBUS_FDT_H
#define HW_ARM_SYSBUS_FDT_H
-#include "hw/arm/arm.h"
-#include "qemu-common.h"
-#include "hw/sysbus.h"
-
-/*
- * struct that contains dimensioning parameters of the platform bus
- */
-typedef struct {
- hwaddr platform_bus_base; /* start address of the bus */
- hwaddr platform_bus_size; /* size of the bus */
- int platform_bus_first_irq; /* first hwirq assigned to the bus */
- int platform_bus_num_irqs; /* number of hwirq assigned to the bus */
-} ARMPlatformBusSystemParams;
-
-/*
- * struct that contains all relevant info to build the fdt nodes of
- * platform bus and attached dynamic sysbus devices
- * in the future might be augmented with additional info
- * such as PHY, CLK handles ...
- */
-typedef struct {
- const ARMPlatformBusSystemParams *system_params;
- struct arm_boot_info *binfo;
- const char *intc; /* parent interrupt controller name */
-} ARMPlatformBusFDTParams;
+#include "exec/hwaddr.h"
/**
- * arm_register_platform_bus_fdt_creator - register a machine init done
- * notifier that creates the device tree nodes of the platform bus and
- * associated dynamic sysbus devices
+ * platform_bus_add_all_fdt_nodes - create all the platform bus nodes
+ *
+ * builds the parent platform bus node and all the nodes of dynamic
+ * sysbus devices attached to it.
*/
-void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params);
-
+void platform_bus_add_all_fdt_nodes(void *fdt, const char *intc, hwaddr addr,
+ hwaddr bus_size, int irq_start);
#endif
diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 1e2be20731..9496f331a8 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -36,8 +36,8 @@
#define ARM64_TEXT_OFFSET_OFFSET 8
#define ARM64_MAGIC_OFFSET 56
-static AddressSpace *arm_boot_address_space(ARMCPU *cpu,
- const struct arm_boot_info *info)
+AddressSpace *arm_boot_address_space(ARMCPU *cpu,
+ const struct arm_boot_info *info)
{
/* Return the address space to use for bootloader reads and writes.
* We prefer the secure address space if the CPU has it and we're
@@ -486,29 +486,8 @@ static void fdt_add_psci_node(void *fdt)
qemu_fdt_setprop_cell(fdt, "/psci", "migrate", migrate_fn);
}
-/**
- * load_dtb() - load a device tree binary image into memory
- * @addr: the address to load the image at
- * @binfo: struct describing the boot environment
- * @addr_limit: upper limit of the available memory area at @addr
- * @as: address space to load image to
- *
- * Load a device tree supplied by the machine or by the user with the
- * '-dtb' command line option, and put it at offset @addr in target
- * memory.
- *
- * If @addr_limit contains a meaningful value (i.e., it is strictly greater
- * than @addr), the device tree is only loaded if its size does not exceed
- * the limit.
- *
- * Returns: the size of the device tree image on success,
- * 0 if the image size exceeds the limit,
- * -1 on errors.
- *
- * Note: Must not be called unless have_dtb(binfo) is true.
- */
-static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
- hwaddr addr_limit, AddressSpace *as)
+int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
+ hwaddr addr_limit, AddressSpace *as)
{
void *fdt = NULL;
int size, rc;
@@ -935,7 +914,7 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base,
return size;
}
-static void arm_load_kernel_notify(Notifier *notifier, void *data)
+void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
{
CPUState *cs;
int kernel_size;
@@ -945,11 +924,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
int elf_machine;
hwaddr entry;
static const ARMInsnFixup *primary_loader;
- ArmLoadKernelNotifier *n = DO_UPCAST(ArmLoadKernelNotifier,
- notifier, notifier);
- ARMCPU *cpu = n->cpu;
- struct arm_boot_info *info =
- container_of(n, struct arm_boot_info, load_kernel_notifier);
AddressSpace *as = arm_boot_address_space(cpu, info);
/* The board code is not supposed to set secure_board_setup unless
@@ -959,6 +933,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
assert(!(info->secure_board_setup && kvm_enabled()));
info->dtb_filename = qemu_opt_get(qemu_get_machine_opts(), "dtb");
+ info->dtb_limit = 0;
/* Load the kernel. */
if (!info->kernel_filename || info->firmware_loaded) {
@@ -968,9 +943,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
* the kernel is supposed to be loaded by the bootloader), copy the
* DTB to the base of RAM for the bootloader to pick up.
*/
- if (load_dtb(info->loader_start, info, 0, as) < 0) {
- exit(1);
- }
+ info->dtb_start = info->loader_start;
}
if (info->kernel_filename) {
@@ -1050,15 +1023,14 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
*/
if (elf_low_addr > info->loader_start
|| elf_high_addr < info->loader_start) {
- /* Pass elf_low_addr as address limit to load_dtb if it may be
+ /* Set elf_low_addr as address limit for arm_load_dtb if it may be
* pointing into RAM, otherwise pass '0' (no limit)
*/
if (elf_low_addr < info->loader_start) {
elf_low_addr = 0;
}
- if (load_dtb(info->loader_start, info, elf_low_addr, as) < 0) {
- exit(1);
- }
+ info->dtb_start = info->loader_start;
+ info->dtb_limit = elf_low_addr;
}
}
entry = elf_entry;
@@ -1116,7 +1088,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
*/
if (have_dtb(info)) {
hwaddr align;
- hwaddr dtb_start;
if (elf_machine == EM_AARCH64) {
/*
@@ -1136,11 +1107,9 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
}
/* Place the DTB after the initrd in memory with alignment. */
- dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size, align);
- if (load_dtb(dtb_start, info, 0, as) < 0) {
- exit(1);
- }
- fixupcontext[FIXUP_ARGPTR] = dtb_start;
+ info->dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size,
+ align);
+ fixupcontext[FIXUP_ARGPTR] = info->dtb_start;
} else {
fixupcontext[FIXUP_ARGPTR] = info->loader_start + KERNEL_ARGS_ADDR;
if (info->ram_size >= (1ULL << 32)) {
@@ -1173,15 +1142,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
ARM_CPU(cs)->env.boot_info = info;
}
-}
-
-void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
-{
- CPUState *cs;
-
- info->load_kernel_notifier.cpu = cpu;
- info->load_kernel_notifier.notifier.notify = arm_load_kernel_notify;
- qemu_add_machine_init_done_notifier(&info->load_kernel_notifier.notifier);
/* CPU objects (unlike devices) are not automatically reset on system
* reset, so we must always register a handler to do so. If we're
@@ -1191,6 +1151,12 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
qemu_register_reset(do_cpu_reset, ARM_CPU(cs));
}
+
+ if (!info->skip_dtb_autoload && have_dtb(info)) {
+ if (arm_load_dtb(info->dtb_start, info, info->dtb_limit, as) < 0) {
+ exit(1);
+ }
+ }
}
static const TypeInfo arm_linux_boot_if_info = {
diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
index 80ff70e1ed..e4c492ea44 100644
--- a/hw/arm/sysbus-fdt.c
+++ b/hw/arm/sysbus-fdt.c
@@ -49,15 +49,6 @@ typedef struct PlatformBusFDTData {
PlatformBusDevice *pbus;
} PlatformBusFDTData;
-/*
- * struct used when calling the machine init done notifier
- * that constructs the fdt nodes of platform bus devices
- */
-typedef struct PlatformBusFDTNotifierParams {
- Notifier notifier;
- ARMPlatformBusFDTParams *fdt_params;
-} PlatformBusFDTNotifierParams;
-
/* struct that associates a device type name and a node creation function */
typedef struct NodeCreationPair {
const char *typename;
@@ -453,42 +444,17 @@ static void add_fdt_node(SysBusDevice *sbdev, void *opaque)
exit(1);
}
-/**
- * add_all_platform_bus_fdt_nodes - create all the platform bus nodes
- *
- * builds the parent platform bus node and all the nodes of dynamic
- * sysbus devices attached to it.
- */
-static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
+void platform_bus_add_all_fdt_nodes(void *fdt, const char *intc, hwaddr addr,
+ hwaddr bus_size, int irq_start)
{
const char platcomp[] = "qemu,platform\0simple-bus";
PlatformBusDevice *pbus;
DeviceState *dev;
gchar *node;
- uint64_t addr, size;
- int irq_start, dtb_size;
- struct arm_boot_info *info = fdt_params->binfo;
- const ARMPlatformBusSystemParams *params = fdt_params->system_params;
- const char *intc = fdt_params->intc;
- void *fdt = info->get_dtb(info, &dtb_size);
-
- /*
- * If the user provided a dtb, we assume the dynamic sysbus nodes
- * already are integrated there. This corresponds to a use case where
- * the dynamic sysbus nodes are complex and their generation is not yet
- * supported. In that case the user can take charge of the guest dt
- * while qemu takes charge of the qom stuff.
- */
- if (info->dtb_filename) {
- return;
- }
assert(fdt);
- node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
- addr = params->platform_bus_base;
- size = params->platform_bus_size;
- irq_start = params->platform_bus_first_irq;
+ node = g_strdup_printf("/platform@%"PRIx64, addr);
/* Create a /platform node that we can put all devices into */
qemu_fdt_add_subnode(fdt, node);
@@ -499,7 +465,7 @@ static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
*/
qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
- qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
+ qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, bus_size);
qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);
@@ -518,22 +484,3 @@ static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
g_free(node);
}
-
-static void platform_bus_fdt_notify(Notifier *notifier, void *data)
-{
- PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
- notifier, notifier);
-
- add_all_platform_bus_fdt_nodes(p->fdt_params);
- g_free(p->fdt_params);
- g_free(p);
-}
-
-void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
-{
- PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);
-
- p->fdt_params = fdt_params;
- p->notifier.notify = platform_bus_fdt_notify;
- qemu_add_machine_init_done_notifier(&p->notifier);
-}
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 1f54223f19..6710be226f 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -94,8 +94,6 @@
#define PLATFORM_BUS_NUM_IRQS 64
-static ARMPlatformBusSystemParams platform_bus_params;
-
/* RAM limit in GB. Since VIRT_MEM starts at the 1GB mark, this means
* RAM can go up to the 256GB mark, leaving 256GB of the physical
* address space unallocated and free for future use between 256G and 512G.
@@ -1126,40 +1124,23 @@ static void create_platform_bus(VirtMachineState *vms, qemu_irq *pic)
DeviceState *dev;
SysBusDevice *s;
int i;
- ARMPlatformBusFDTParams *fdt_params = g_new(ARMPlatformBusFDTParams, 1);
MemoryRegion *sysmem = get_system_memory();
- platform_bus_params.platform_bus_base = vms->memmap[VIRT_PLATFORM_BUS].base;
- platform_bus_params.platform_bus_size = vms->memmap[VIRT_PLATFORM_BUS].size;
- platform_bus_params.platform_bus_first_irq = vms->irqmap[VIRT_PLATFORM_BUS];
- platform_bus_params.platform_bus_num_irqs = PLATFORM_BUS_NUM_IRQS;
-
- fdt_params->system_params = &platform_bus_params;
- fdt_params->binfo = &vms->bootinfo;
- fdt_params->intc = "/intc";
- /*
- * register a machine init done notifier that creates the device tree
- * nodes of the platform bus and its children dynamic sysbus devices
- */
- arm_register_platform_bus_fdt_creator(fdt_params);
-
dev = qdev_create(NULL, TYPE_PLATFORM_BUS_DEVICE);
dev->id = TYPE_PLATFORM_BUS_DEVICE;
- qdev_prop_set_uint32(dev, "num_irqs",
- platform_bus_params.platform_bus_num_irqs);
- qdev_prop_set_uint32(dev, "mmio_size",
- platform_bus_params.platform_bus_size);
+ qdev_prop_set_uint32(dev, "num_irqs", PLATFORM_BUS_NUM_IRQS);
+ qdev_prop_set_uint32(dev, "mmio_size", vms->memmap[VIRT_PLATFORM_BUS].size);
qdev_init_nofail(dev);
vms->platform_bus_dev = dev;
- s = SYS_BUS_DEVICE(dev);
- for (i = 0; i < platform_bus_params.platform_bus_num_irqs; i++) {
- int irqn = platform_bus_params.platform_bus_first_irq + i;
+ s = SYS_BUS_DEVICE(dev);
+ for (i = 0; i < PLATFORM_BUS_NUM_IRQS; i++) {
+ int irqn = vms->irqmap[VIRT_PLATFORM_BUS] + i;
sysbus_connect_irq(s, i, pic[irqn]);
}
memory_region_add_subregion(sysmem,
- platform_bus_params.platform_bus_base,
+ vms->memmap[VIRT_PLATFORM_BUS].base,
sysbus_mmio_get_region(s, 0));
}
@@ -1230,6 +1211,26 @@ void virt_machine_done(Notifier *notifier, void *data)
{
VirtMachineState *vms = container_of(notifier, VirtMachineState,
machine_done);
+ ARMCPU *cpu = ARM_CPU(first_cpu);
+ struct arm_boot_info *info = &vms->bootinfo;
+ AddressSpace *as = arm_boot_address_space(cpu, info);
+
+ /*
+ * If the user provided a dtb, we assume the dynamic sysbus nodes
+ * already are integrated there. This corresponds to a use case where
+ * the dynamic sysbus nodes are complex and their generation is not yet
+ * supported. In that case the user can take charge of the guest dt
+ * while qemu takes charge of the qom stuff.
+ */
+ if (info->dtb_filename == NULL) {
+ platform_bus_add_all_fdt_nodes(vms->fdt, "/intc",
+ vms->memmap[VIRT_PLATFORM_BUS].base,
+ vms->memmap[VIRT_PLATFORM_BUS].size,
+ vms->irqmap[VIRT_PLATFORM_BUS]);
+ }
+ if (arm_load_dtb(info->dtb_start, info, info->dtb_limit, as) < 0) {
+ exit(1);
+ }
virt_acpi_setup(vms);
virt_build_smbios(vms);
@@ -1457,8 +1458,7 @@ static void machvirt_init(MachineState *machine)
vms->fw_cfg = create_fw_cfg(vms, &address_space_memory);
rom_set_fw(vms->fw_cfg);
- vms->machine_done.notify = virt_machine_done;
- qemu_add_machine_init_done_notifier(&vms->machine_done);
+ create_platform_bus(vms, pic);
vms->bootinfo.ram_size = machine->ram_size;
vms->bootinfo.kernel_filename = machine->kernel_filename;
@@ -1468,16 +1468,12 @@ static void machvirt_init(MachineState *machine)
vms->bootinfo.board_id = -1;
vms->bootinfo.loader_start = vms->memmap[VIRT_MEM].base;
vms->bootinfo.get_dtb = machvirt_dtb;
+ vms->bootinfo.skip_dtb_autoload = true;
vms->bootinfo.firmware_loaded = firmware_loaded;
arm_load_kernel(ARM_CPU(first_cpu), &vms->bootinfo);
- /*
- * arm_load_kernel machine init done notifier registration must
- * happen before the platform_bus_create call. In this latter,
- * another notifier is registered which adds platform bus nodes.
- * Notifiers are executed in registration reverse order.
- */
- create_platform_bus(vms, pic);
+ vms->machine_done.notify = virt_machine_done;
+ qemu_add_machine_init_done_notifier(&vms->machine_done);
}
static bool virt_get_secure(Object *obj, Error **errp)
--
2.17.0
Hi,
On 05/10/2018 07:45 PM, Peter Maydell wrote:
> From: Igor Mammedov <imammedo@redhat.com>
>
> load_dtb() depends on arm_load_kernel() to figure out place
> in RAM where it should be loaded, but it's not required for
> arm_load_kernel() to work. Sometimes it's neccesary for
> devices added with -device/device_add to be enumerated in
> DTB as well, which's lead to [1] and surrounding commits to
> add 2 more machine_done notifiers with non obvious ordering
> to make dynamic sysbus devices initialization happen in
> the right order.
>
> However instead of moving whole arm_load_kernel() in to
> machine_done, it's sufficient to move only load_dtb() into
> virt_machine_done() notifier and remove ArmLoadKernelNotifier/
> /PlatformBusFDTNotifierParams notifiers, which saves us ~90LOC
> and simplifies code flow quite a bit.
> Later would allow to consolidate DTB generation within one
> function for 'mach-virt' board and make it reentrant so it
> could generate updated DTB in device hotplug secenarios.
>
> While at it rename load_dtb() to arm_load_dtb() since it's
> public now.
>
> Add additional field skip_dtb_autoload to struct arm_boot_info
> to allow manual DTB load later in mach-virt and to avoid touching
> all other boards to explicitly call arm_load_dtb().
>
> 1) (ac9d32e hw/arm/boot: arm_load_kernel implemented as a machine init done notifier)
I face a regression that looks to be caused by this patch (bisect
session result). Reverting it allows the guest to boot. Otherwise I get:
in kvm_device_access() at
/home/augere/UPSTREAM/qemu/accel/kvm/kvm-all.c:2164:
2018-05-22T18:02:17.210175Z qemu-system-aarch64: KVM_SET_DEVICE_ATTR
failed: Group 6 attr 0x000000000000c665: Invalid argument
It happens when booting with -bios option only (with dt, it boots fine).
I have not identified the root cause yet.
Thanks
Eric
>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Reviewed-by: Andrew Jones <drjones@redhat.com>
> Message-id: 1525691524-32265-4-git-send-email-imammedo@redhat.com
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> include/hw/arm/arm.h | 45 +++++++++++++++++------
> include/hw/arm/sysbus-fdt.h | 37 ++++---------------
> hw/arm/boot.c | 72 ++++++++++---------------------------
> hw/arm/sysbus-fdt.c | 61 +++----------------------------
> hw/arm/virt.c | 64 ++++++++++++++++-----------------
> 5 files changed, 94 insertions(+), 185 deletions(-)
>
> diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h
> index ce769bde6a..70fa2287e2 100644
> --- a/include/hw/arm/arm.h
> +++ b/include/hw/arm/arm.h
> @@ -39,15 +39,6 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
> */
> void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size);
>
> -/*
> - * struct used as a parameter of the arm_load_kernel machine init
> - * done notifier
> - */
> -typedef struct {
> - Notifier notifier; /* actual notifier */
> - ARMCPU *cpu; /* handle to the first cpu object */
> -} ArmLoadKernelNotifier;
> -
> /* arm_boot.c */
> struct arm_boot_info {
> uint64_t ram_size;
> @@ -56,6 +47,13 @@ struct arm_boot_info {
> const char *initrd_filename;
> const char *dtb_filename;
> hwaddr loader_start;
> + hwaddr dtb_start;
> + hwaddr dtb_limit;
> + /* If set to True, arm_load_kernel() will not load DTB.
> + * It allows board to load DTB manually later.
> + * (default: False)
> + */
> + bool skip_dtb_autoload;
> /* multicore boards that use the default secondary core boot functions
> * need to put the address of the secondary boot code, the boot reg,
> * and the GIC address in the next 3 values, respectively. boards that
> @@ -94,8 +92,6 @@ struct arm_boot_info {
> * the user it should implement this hook.
> */
> void (*modify_dtb)(const struct arm_boot_info *info, void *fdt);
> - /* machine init done notifier executing arm_load_dtb */
> - ArmLoadKernelNotifier load_kernel_notifier;
> /* Used internally by arm_boot.c */
> int is_linux;
> hwaddr initrd_start;
> @@ -143,6 +139,33 @@ struct arm_boot_info {
> */
> void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info);
>
> +AddressSpace *arm_boot_address_space(ARMCPU *cpu,
> + const struct arm_boot_info *info);
> +
> +/**
> + * arm_load_dtb() - load a device tree binary image into memory
> + * @addr: the address to load the image at
> + * @binfo: struct describing the boot environment
> + * @addr_limit: upper limit of the available memory area at @addr
> + * @as: address space to load image to
> + *
> + * Load a device tree supplied by the machine or by the user with the
> + * '-dtb' command line option, and put it at offset @addr in target
> + * memory.
> + *
> + * If @addr_limit contains a meaningful value (i.e., it is strictly greater
> + * than @addr), the device tree is only loaded if its size does not exceed
> + * the limit.
> + *
> + * Returns: the size of the device tree image on success,
> + * 0 if the image size exceeds the limit,
> + * -1 on errors.
> + *
> + * Note: Must not be called unless have_dtb(binfo) is true.
> + */
> +int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
> + hwaddr addr_limit, AddressSpace *as);
> +
> /* Write a secure board setup routine with a dummy handler for SMCs */
> void arm_write_secure_board_setup_dummy_smc(ARMCPU *cpu,
> const struct arm_boot_info *info,
> diff --git a/include/hw/arm/sysbus-fdt.h b/include/hw/arm/sysbus-fdt.h
> index e15bb81807..340c382cdd 100644
> --- a/include/hw/arm/sysbus-fdt.h
> +++ b/include/hw/arm/sysbus-fdt.h
> @@ -24,37 +24,14 @@
> #ifndef HW_ARM_SYSBUS_FDT_H
> #define HW_ARM_SYSBUS_FDT_H
>
> -#include "hw/arm/arm.h"
> -#include "qemu-common.h"
> -#include "hw/sysbus.h"
> -
> -/*
> - * struct that contains dimensioning parameters of the platform bus
> - */
> -typedef struct {
> - hwaddr platform_bus_base; /* start address of the bus */
> - hwaddr platform_bus_size; /* size of the bus */
> - int platform_bus_first_irq; /* first hwirq assigned to the bus */
> - int platform_bus_num_irqs; /* number of hwirq assigned to the bus */
> -} ARMPlatformBusSystemParams;
> -
> -/*
> - * struct that contains all relevant info to build the fdt nodes of
> - * platform bus and attached dynamic sysbus devices
> - * in the future might be augmented with additional info
> - * such as PHY, CLK handles ...
> - */
> -typedef struct {
> - const ARMPlatformBusSystemParams *system_params;
> - struct arm_boot_info *binfo;
> - const char *intc; /* parent interrupt controller name */
> -} ARMPlatformBusFDTParams;
> +#include "exec/hwaddr.h"
>
> /**
> - * arm_register_platform_bus_fdt_creator - register a machine init done
> - * notifier that creates the device tree nodes of the platform bus and
> - * associated dynamic sysbus devices
> + * platform_bus_add_all_fdt_nodes - create all the platform bus nodes
> + *
> + * builds the parent platform bus node and all the nodes of dynamic
> + * sysbus devices attached to it.
> */
> -void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params);
> -
> +void platform_bus_add_all_fdt_nodes(void *fdt, const char *intc, hwaddr addr,
> + hwaddr bus_size, int irq_start);
> #endif
> diff --git a/hw/arm/boot.c b/hw/arm/boot.c
> index 1e2be20731..9496f331a8 100644
> --- a/hw/arm/boot.c
> +++ b/hw/arm/boot.c
> @@ -36,8 +36,8 @@
> #define ARM64_TEXT_OFFSET_OFFSET 8
> #define ARM64_MAGIC_OFFSET 56
>
> -static AddressSpace *arm_boot_address_space(ARMCPU *cpu,
> - const struct arm_boot_info *info)
> +AddressSpace *arm_boot_address_space(ARMCPU *cpu,
> + const struct arm_boot_info *info)
> {
> /* Return the address space to use for bootloader reads and writes.
> * We prefer the secure address space if the CPU has it and we're
> @@ -486,29 +486,8 @@ static void fdt_add_psci_node(void *fdt)
> qemu_fdt_setprop_cell(fdt, "/psci", "migrate", migrate_fn);
> }
>
> -/**
> - * load_dtb() - load a device tree binary image into memory
> - * @addr: the address to load the image at
> - * @binfo: struct describing the boot environment
> - * @addr_limit: upper limit of the available memory area at @addr
> - * @as: address space to load image to
> - *
> - * Load a device tree supplied by the machine or by the user with the
> - * '-dtb' command line option, and put it at offset @addr in target
> - * memory.
> - *
> - * If @addr_limit contains a meaningful value (i.e., it is strictly greater
> - * than @addr), the device tree is only loaded if its size does not exceed
> - * the limit.
> - *
> - * Returns: the size of the device tree image on success,
> - * 0 if the image size exceeds the limit,
> - * -1 on errors.
> - *
> - * Note: Must not be called unless have_dtb(binfo) is true.
> - */
> -static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
> - hwaddr addr_limit, AddressSpace *as)
> +int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
> + hwaddr addr_limit, AddressSpace *as)
> {
> void *fdt = NULL;
> int size, rc;
> @@ -935,7 +914,7 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base,
> return size;
> }
>
> -static void arm_load_kernel_notify(Notifier *notifier, void *data)
> +void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
> {
> CPUState *cs;
> int kernel_size;
> @@ -945,11 +924,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> int elf_machine;
> hwaddr entry;
> static const ARMInsnFixup *primary_loader;
> - ArmLoadKernelNotifier *n = DO_UPCAST(ArmLoadKernelNotifier,
> - notifier, notifier);
> - ARMCPU *cpu = n->cpu;
> - struct arm_boot_info *info =
> - container_of(n, struct arm_boot_info, load_kernel_notifier);
> AddressSpace *as = arm_boot_address_space(cpu, info);
>
> /* The board code is not supposed to set secure_board_setup unless
> @@ -959,6 +933,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> assert(!(info->secure_board_setup && kvm_enabled()));
>
> info->dtb_filename = qemu_opt_get(qemu_get_machine_opts(), "dtb");
> + info->dtb_limit = 0;
>
> /* Load the kernel. */
> if (!info->kernel_filename || info->firmware_loaded) {
> @@ -968,9 +943,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> * the kernel is supposed to be loaded by the bootloader), copy the
> * DTB to the base of RAM for the bootloader to pick up.
> */
> - if (load_dtb(info->loader_start, info, 0, as) < 0) {
> - exit(1);
> - }
> + info->dtb_start = info->loader_start;
> }
>
> if (info->kernel_filename) {
> @@ -1050,15 +1023,14 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> */
> if (elf_low_addr > info->loader_start
> || elf_high_addr < info->loader_start) {
> - /* Pass elf_low_addr as address limit to load_dtb if it may be
> + /* Set elf_low_addr as address limit for arm_load_dtb if it may be
> * pointing into RAM, otherwise pass '0' (no limit)
> */
> if (elf_low_addr < info->loader_start) {
> elf_low_addr = 0;
> }
> - if (load_dtb(info->loader_start, info, elf_low_addr, as) < 0) {
> - exit(1);
> - }
> + info->dtb_start = info->loader_start;
> + info->dtb_limit = elf_low_addr;
> }
> }
> entry = elf_entry;
> @@ -1116,7 +1088,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> */
> if (have_dtb(info)) {
> hwaddr align;
> - hwaddr dtb_start;
>
> if (elf_machine == EM_AARCH64) {
> /*
> @@ -1136,11 +1107,9 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> }
>
> /* Place the DTB after the initrd in memory with alignment. */
> - dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size, align);
> - if (load_dtb(dtb_start, info, 0, as) < 0) {
> - exit(1);
> - }
> - fixupcontext[FIXUP_ARGPTR] = dtb_start;
> + info->dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size,
> + align);
> + fixupcontext[FIXUP_ARGPTR] = info->dtb_start;
> } else {
> fixupcontext[FIXUP_ARGPTR] = info->loader_start + KERNEL_ARGS_ADDR;
> if (info->ram_size >= (1ULL << 32)) {
> @@ -1173,15 +1142,6 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
> for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
> ARM_CPU(cs)->env.boot_info = info;
> }
> -}
> -
> -void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
> -{
> - CPUState *cs;
> -
> - info->load_kernel_notifier.cpu = cpu;
> - info->load_kernel_notifier.notifier.notify = arm_load_kernel_notify;
> - qemu_add_machine_init_done_notifier(&info->load_kernel_notifier.notifier);
>
> /* CPU objects (unlike devices) are not automatically reset on system
> * reset, so we must always register a handler to do so. If we're
> @@ -1191,6 +1151,12 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
> for (cs = first_cpu; cs; cs = CPU_NEXT(cs)) {
> qemu_register_reset(do_cpu_reset, ARM_CPU(cs));
> }
> +
> + if (!info->skip_dtb_autoload && have_dtb(info)) {
> + if (arm_load_dtb(info->dtb_start, info, info->dtb_limit, as) < 0) {
> + exit(1);
> + }
> + }
> }
>
> static const TypeInfo arm_linux_boot_if_info = {
> diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
> index 80ff70e1ed..e4c492ea44 100644
> --- a/hw/arm/sysbus-fdt.c
> +++ b/hw/arm/sysbus-fdt.c
> @@ -49,15 +49,6 @@ typedef struct PlatformBusFDTData {
> PlatformBusDevice *pbus;
> } PlatformBusFDTData;
>
> -/*
> - * struct used when calling the machine init done notifier
> - * that constructs the fdt nodes of platform bus devices
> - */
> -typedef struct PlatformBusFDTNotifierParams {
> - Notifier notifier;
> - ARMPlatformBusFDTParams *fdt_params;
> -} PlatformBusFDTNotifierParams;
> -
> /* struct that associates a device type name and a node creation function */
> typedef struct NodeCreationPair {
> const char *typename;
> @@ -453,42 +444,17 @@ static void add_fdt_node(SysBusDevice *sbdev, void *opaque)
> exit(1);
> }
>
> -/**
> - * add_all_platform_bus_fdt_nodes - create all the platform bus nodes
> - *
> - * builds the parent platform bus node and all the nodes of dynamic
> - * sysbus devices attached to it.
> - */
> -static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
> +void platform_bus_add_all_fdt_nodes(void *fdt, const char *intc, hwaddr addr,
> + hwaddr bus_size, int irq_start)
> {
> const char platcomp[] = "qemu,platform\0simple-bus";
> PlatformBusDevice *pbus;
> DeviceState *dev;
> gchar *node;
> - uint64_t addr, size;
> - int irq_start, dtb_size;
> - struct arm_boot_info *info = fdt_params->binfo;
> - const ARMPlatformBusSystemParams *params = fdt_params->system_params;
> - const char *intc = fdt_params->intc;
> - void *fdt = info->get_dtb(info, &dtb_size);
> -
> - /*
> - * If the user provided a dtb, we assume the dynamic sysbus nodes
> - * already are integrated there. This corresponds to a use case where
> - * the dynamic sysbus nodes are complex and their generation is not yet
> - * supported. In that case the user can take charge of the guest dt
> - * while qemu takes charge of the qom stuff.
> - */
> - if (info->dtb_filename) {
> - return;
> - }
>
> assert(fdt);
>
> - node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
> - addr = params->platform_bus_base;
> - size = params->platform_bus_size;
> - irq_start = params->platform_bus_first_irq;
> + node = g_strdup_printf("/platform@%"PRIx64, addr);
>
> /* Create a /platform node that we can put all devices into */
> qemu_fdt_add_subnode(fdt, node);
> @@ -499,7 +465,7 @@ static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
> */
> qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
> qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
> - qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
> + qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, bus_size);
>
> qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);
>
> @@ -518,22 +484,3 @@ static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
>
> g_free(node);
> }
> -
> -static void platform_bus_fdt_notify(Notifier *notifier, void *data)
> -{
> - PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
> - notifier, notifier);
> -
> - add_all_platform_bus_fdt_nodes(p->fdt_params);
> - g_free(p->fdt_params);
> - g_free(p);
> -}
> -
> -void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
> -{
> - PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);
> -
> - p->fdt_params = fdt_params;
> - p->notifier.notify = platform_bus_fdt_notify;
> - qemu_add_machine_init_done_notifier(&p->notifier);
> -}
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 1f54223f19..6710be226f 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -94,8 +94,6 @@
>
> #define PLATFORM_BUS_NUM_IRQS 64
>
> -static ARMPlatformBusSystemParams platform_bus_params;
> -
> /* RAM limit in GB. Since VIRT_MEM starts at the 1GB mark, this means
> * RAM can go up to the 256GB mark, leaving 256GB of the physical
> * address space unallocated and free for future use between 256G and 512G.
> @@ -1126,40 +1124,23 @@ static void create_platform_bus(VirtMachineState *vms, qemu_irq *pic)
> DeviceState *dev;
> SysBusDevice *s;
> int i;
> - ARMPlatformBusFDTParams *fdt_params = g_new(ARMPlatformBusFDTParams, 1);
> MemoryRegion *sysmem = get_system_memory();
>
> - platform_bus_params.platform_bus_base = vms->memmap[VIRT_PLATFORM_BUS].base;
> - platform_bus_params.platform_bus_size = vms->memmap[VIRT_PLATFORM_BUS].size;
> - platform_bus_params.platform_bus_first_irq = vms->irqmap[VIRT_PLATFORM_BUS];
> - platform_bus_params.platform_bus_num_irqs = PLATFORM_BUS_NUM_IRQS;
> -
> - fdt_params->system_params = &platform_bus_params;
> - fdt_params->binfo = &vms->bootinfo;
> - fdt_params->intc = "/intc";
> - /*
> - * register a machine init done notifier that creates the device tree
> - * nodes of the platform bus and its children dynamic sysbus devices
> - */
> - arm_register_platform_bus_fdt_creator(fdt_params);
> -
> dev = qdev_create(NULL, TYPE_PLATFORM_BUS_DEVICE);
> dev->id = TYPE_PLATFORM_BUS_DEVICE;
> - qdev_prop_set_uint32(dev, "num_irqs",
> - platform_bus_params.platform_bus_num_irqs);
> - qdev_prop_set_uint32(dev, "mmio_size",
> - platform_bus_params.platform_bus_size);
> + qdev_prop_set_uint32(dev, "num_irqs", PLATFORM_BUS_NUM_IRQS);
> + qdev_prop_set_uint32(dev, "mmio_size", vms->memmap[VIRT_PLATFORM_BUS].size);
> qdev_init_nofail(dev);
> vms->platform_bus_dev = dev;
> - s = SYS_BUS_DEVICE(dev);
>
> - for (i = 0; i < platform_bus_params.platform_bus_num_irqs; i++) {
> - int irqn = platform_bus_params.platform_bus_first_irq + i;
> + s = SYS_BUS_DEVICE(dev);
> + for (i = 0; i < PLATFORM_BUS_NUM_IRQS; i++) {
> + int irqn = vms->irqmap[VIRT_PLATFORM_BUS] + i;
> sysbus_connect_irq(s, i, pic[irqn]);
> }
>
> memory_region_add_subregion(sysmem,
> - platform_bus_params.platform_bus_base,
> + vms->memmap[VIRT_PLATFORM_BUS].base,
> sysbus_mmio_get_region(s, 0));
> }
>
> @@ -1230,6 +1211,26 @@ void virt_machine_done(Notifier *notifier, void *data)
> {
> VirtMachineState *vms = container_of(notifier, VirtMachineState,
> machine_done);
> + ARMCPU *cpu = ARM_CPU(first_cpu);
> + struct arm_boot_info *info = &vms->bootinfo;
> + AddressSpace *as = arm_boot_address_space(cpu, info);
> +
> + /*
> + * If the user provided a dtb, we assume the dynamic sysbus nodes
> + * already are integrated there. This corresponds to a use case where
> + * the dynamic sysbus nodes are complex and their generation is not yet
> + * supported. In that case the user can take charge of the guest dt
> + * while qemu takes charge of the qom stuff.
> + */
> + if (info->dtb_filename == NULL) {
> + platform_bus_add_all_fdt_nodes(vms->fdt, "/intc",
> + vms->memmap[VIRT_PLATFORM_BUS].base,
> + vms->memmap[VIRT_PLATFORM_BUS].size,
> + vms->irqmap[VIRT_PLATFORM_BUS]);
> + }
> + if (arm_load_dtb(info->dtb_start, info, info->dtb_limit, as) < 0) {
> + exit(1);
> + }
>
> virt_acpi_setup(vms);
> virt_build_smbios(vms);
> @@ -1457,8 +1458,7 @@ static void machvirt_init(MachineState *machine)
> vms->fw_cfg = create_fw_cfg(vms, &address_space_memory);
> rom_set_fw(vms->fw_cfg);
>
> - vms->machine_done.notify = virt_machine_done;
> - qemu_add_machine_init_done_notifier(&vms->machine_done);
> + create_platform_bus(vms, pic);
>
> vms->bootinfo.ram_size = machine->ram_size;
> vms->bootinfo.kernel_filename = machine->kernel_filename;
> @@ -1468,16 +1468,12 @@ static void machvirt_init(MachineState *machine)
> vms->bootinfo.board_id = -1;
> vms->bootinfo.loader_start = vms->memmap[VIRT_MEM].base;
> vms->bootinfo.get_dtb = machvirt_dtb;
> + vms->bootinfo.skip_dtb_autoload = true;
> vms->bootinfo.firmware_loaded = firmware_loaded;
> arm_load_kernel(ARM_CPU(first_cpu), &vms->bootinfo);
>
> - /*
> - * arm_load_kernel machine init done notifier registration must
> - * happen before the platform_bus_create call. In this latter,
> - * another notifier is registered which adds platform bus nodes.
> - * Notifiers are executed in registration reverse order.
> - */
> - create_platform_bus(vms, pic);
> + vms->machine_done.notify = virt_machine_done;
> + qemu_add_machine_init_done_notifier(&vms->machine_done);
> }
>
> static bool virt_get_secure(Object *obj, Error **errp)
>
On Wed, 23 May 2018 09:38:33 +0200 Auger Eric <eric.auger@redhat.com> wrote: > Hi, > > On 05/10/2018 07:45 PM, Peter Maydell wrote: > > From: Igor Mammedov <imammedo@redhat.com> > > > > load_dtb() depends on arm_load_kernel() to figure out place > > in RAM where it should be loaded, but it's not required for > > arm_load_kernel() to work. Sometimes it's neccesary for > > devices added with -device/device_add to be enumerated in > > DTB as well, which's lead to [1] and surrounding commits to > > add 2 more machine_done notifiers with non obvious ordering > > to make dynamic sysbus devices initialization happen in > > the right order. > > > > However instead of moving whole arm_load_kernel() in to > > machine_done, it's sufficient to move only load_dtb() into > > virt_machine_done() notifier and remove ArmLoadKernelNotifier/ > > /PlatformBusFDTNotifierParams notifiers, which saves us ~90LOC > > and simplifies code flow quite a bit. > > Later would allow to consolidate DTB generation within one > > function for 'mach-virt' board and make it reentrant so it > > could generate updated DTB in device hotplug secenarios. > > > > While at it rename load_dtb() to arm_load_dtb() since it's > > public now. > > > > Add additional field skip_dtb_autoload to struct arm_boot_info > > to allow manual DTB load later in mach-virt and to avoid touching > > all other boards to explicitly call arm_load_dtb(). > > > > 1) (ac9d32e hw/arm/boot: arm_load_kernel implemented as a machine init done notifier) > > I face a regression that looks to be caused by this patch (bisect > session result). Reverting it allows the guest to boot. Otherwise I get: > > in kvm_device_access() at > /home/augere/UPSTREAM/qemu/accel/kvm/kvm-all.c:2164: > 2018-05-22T18:02:17.210175Z qemu-system-aarch64: KVM_SET_DEVICE_ATTR > failed: Group 6 attr 0x000000000000c665: Invalid argument > > It happens when booting with -bios option only (with dt, it boots fine). > > I have not identified the root cause yet. Problem was with broken reset order, thanks for catching it early. Quick fix is posted under title "arm: fix qemu crash on startup with -bios option"
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