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kvm tools: arm: make .dtb dumping a command-line option

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It can sometimes be useful to dump the .dtb file generated by kvmtool
when debugging a guest. Currently, this is achieved by rebuilding the
tool and changing some #defines, which is fairly clumsy to use.

This patch adds a new command-line option for ARM, allowing the dtb
to be dumped to a named file at runtime.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Will Deacon
2015-06-01 16:39:53 +01:00
parent 5f5b014461
commit ba27ff4631
2 changed files with 14 additions and 12 deletions
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arm/fdt.c
+6 -12
View File
@@ -13,9 +13,6 @@
#include <linux/kernel.h>
#include <linux/sizes.h>
#define DEBUG 0
#define DEBUG_FDT_DUMP_FILE "/tmp/kvmtool.dtb"
static char kern_cmdline[COMMAND_LINE_SIZE];
bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename)
@@ -28,25 +25,21 @@ int kvm__arch_setup_firmware(struct kvm *kvm)
return 0;
}
#if DEBUG
static void dump_fdt(void *fdt)
static void dump_fdt(const char *dtb_file, void *fdt)
{
int count, fd;
fd = open(DEBUG_FDT_DUMP_FILE, O_CREAT | O_TRUNC | O_RDWR, 0666);
fd = open(dtb_file, O_CREAT | O_TRUNC | O_RDWR, 0666);
if (fd < 0)
die("Failed to write dtb to %s", DEBUG_FDT_DUMP_FILE);
die("Failed to write dtb to %s", dtb_file);
count = write(fd, fdt, FDT_MAX_SIZE);
if (count < 0)
die_perror("Failed to dump dtb");
pr_info("Wrote %d bytes to dtb %s\n", count, DEBUG_FDT_DUMP_FILE);
pr_info("Wrote %d bytes to dtb %s\n", count, dtb_file);
close(fd);
}
#else
static void dump_fdt(void *fdt) { }
#endif
#define DEVICE_NAME_MAX_LEN 32
static void generate_virtio_mmio_node(void *fdt, struct virtio_mmio *vmmio)
@@ -143,7 +136,8 @@ static int setup_fdt(struct kvm *kvm)
_FDT(fdt_open_into(fdt, fdt_dest, FDT_MAX_SIZE));
_FDT(fdt_pack(fdt_dest));
dump_fdt(fdt_dest);
if (kvm->cfg.arch.dump_dtb_filename)
dump_fdt(kvm->cfg.arch.dump_dtb_filename, fdt_dest);
return 0;
}
late_init(setup_fdt);
arm/include/kvm/kvm-config-arch.h
+8
View File
@@ -1,7 +1,15 @@
#ifndef KVM__KVM_CONFIG_ARCH_H
#define KVM__KVM_CONFIG_ARCH_H
#include "kvm/parse-options.h"
struct kvm_config_arch {
const char *dump_dtb_filename;
};
#define OPT_ARCH_RUN(pfx, cfg) \
pfx, \
OPT_STRING('\0', "dump-dtb", &(cfg)->dump_dtb_filename, \
".dtb file", "Dump generated .dtb to specified file"),
#endif /* KVM__KVM_CONFIG_ARCH_H */