[Qemu-devel] [PATCH for-2.1 v2 2/2] acpi: mark ACPI tables ROM blob as extend-able on migration
It fixes migration failure for machine type pc-i440fx-1.7 from QEMU 1.7/2.0 to QEMU 2.1 Migration fails due to ACPI tables size grows across 1.7-2.1 versions. That causes ACPI tables ROM blob to change its size differently for the same configurations on different QEMU versions. As result migration code bails out when attempting to load smaller ROM blob into a bigger one on a newer QEMU. To trigger failure it's enough to add pci-bridge device to QEMU CLI Marking ACPI tables ROM blob as extend-able on migration allows QEMU to load smaller ACPI tables from QEMU 1.7/2.0, fixing forward migration failure introduced since 2.0 which affects only configurations that cause ACPI ROM blob size change. Signed-off-by: Igor Mammedov imamm...@redhat.com Reviewed-by: Laszlo Ersek ler...@redhat.com --- hw/core/loader.c | 6 +- hw/i386/acpi-build.c | 2 +- include/hw/loader.h | 5 +++-- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/hw/core/loader.c b/hw/core/loader.c index 2bf6b8f..d09b894 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -722,7 +722,8 @@ err: void *rom_add_blob(const char *name, const void *blob, size_t len, hwaddr addr, const char *fw_file_name, - FWCfgReadCallback fw_callback, void *callback_opaque) + FWCfgReadCallback fw_callback, void *callback_opaque, + bool extendable) { Rom *rom; void *data = NULL; @@ -742,6 +743,9 @@ void *rom_add_blob(const char *name, const void *blob, size_t len, if (rom_file_has_mr) { data = rom_set_mr(rom, OBJECT(fw_cfg), devpath); +if (extendable) { +memory_region_permit_extendable_migration(rom-mr); +} } else { data = rom-data; } diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index ebc5f03..651c06b 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1558,7 +1558,7 @@ static void *acpi_add_rom_blob(AcpiBuildState *build_state, GArray *blob, const char *name) { return rom_add_blob(name, blob-data, acpi_data_len(blob), -1, name, -acpi_build_update, build_state); +acpi_build_update, build_state, true); } static const VMStateDescription vmstate_acpi_build = { diff --git a/include/hw/loader.h b/include/hw/loader.h index 796cbf9..e5a24ac 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -57,7 +57,8 @@ int rom_add_file(const char *file, const char *fw_dir, bool option_rom); void *rom_add_blob(const char *name, const void *blob, size_t len, hwaddr addr, const char *fw_file_name, - FWCfgReadCallback fw_callback, void *callback_opaque); + FWCfgReadCallback fw_callback, void *callback_opaque, + bool extendable); int rom_add_elf_program(const char *name, void *data, size_t datasize, size_t romsize, hwaddr addr); int rom_load_all(void); @@ -70,7 +71,7 @@ void do_info_roms(Monitor *mon, const QDict *qdict); #define rom_add_file_fixed(_f, _a, _i) \ rom_add_file(_f, NULL, _a, _i, false) #define rom_add_blob_fixed(_f, _b, _l, _a) \ -rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL) +rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL, false) #define PC_ROM_MIN_VGA 0xc #define PC_ROM_MIN_OPTION 0xc8000 -- 1.8.3.1
Re: [Qemu-devel] [PATCH for-2.1 v2 2/2] acpi: mark ACPI tables ROM blob as extend-able on migration
On Mon, 28 Jul 2014 08:03:25 + Igor Mammedov imamm...@redhat.com wrote: It fixes migration failure for machine type pc-i440fx-1.7 from QEMU 1.7/2.0 to QEMU 2.1 Migration fails due to ACPI tables size grows across 1.7-2.1 versions. That causes ACPI tables ROM blob to change its size differently for the same configurations on different QEMU versions. As result migration code bails out when attempting to load smaller ROM blob into a bigger one on a newer QEMU. To trigger failure it's enough to add pci-bridge device to QEMU CLI Marking ACPI tables ROM blob as extend-able on migration allows QEMU to load smaller ACPI tables from QEMU 1.7/2.0, fixing forward migration failure introduced since 2.0 which affects only configurations that cause ACPI ROM blob size change. Signed-off-by: Igor Mammedov imamm...@redhat.com Reviewed-by: Laszlo Ersek ler...@redhat.com Self-NACK I'm sorry for mess, I've tested it on for i386 target, but patch breaks build for other targets. I'll resubmit v3 shortly. --- hw/core/loader.c | 6 +- hw/i386/acpi-build.c | 2 +- include/hw/loader.h | 5 +++-- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/hw/core/loader.c b/hw/core/loader.c index 2bf6b8f..d09b894 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -722,7 +722,8 @@ err: void *rom_add_blob(const char *name, const void *blob, size_t len, hwaddr addr, const char *fw_file_name, - FWCfgReadCallback fw_callback, void *callback_opaque) + FWCfgReadCallback fw_callback, void *callback_opaque, + bool extendable) { Rom *rom; void *data = NULL; @@ -742,6 +743,9 @@ void *rom_add_blob(const char *name, const void *blob, size_t len, if (rom_file_has_mr) { data = rom_set_mr(rom, OBJECT(fw_cfg), devpath); +if (extendable) { +memory_region_permit_extendable_migration(rom-mr); +} } else { data = rom-data; } diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index ebc5f03..651c06b 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1558,7 +1558,7 @@ static void *acpi_add_rom_blob(AcpiBuildState *build_state, GArray *blob, const char *name) { return rom_add_blob(name, blob-data, acpi_data_len(blob), -1, name, -acpi_build_update, build_state); +acpi_build_update, build_state, true); } static const VMStateDescription vmstate_acpi_build = { diff --git a/include/hw/loader.h b/include/hw/loader.h index 796cbf9..e5a24ac 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -57,7 +57,8 @@ int rom_add_file(const char *file, const char *fw_dir, bool option_rom); void *rom_add_blob(const char *name, const void *blob, size_t len, hwaddr addr, const char *fw_file_name, - FWCfgReadCallback fw_callback, void *callback_opaque); + FWCfgReadCallback fw_callback, void *callback_opaque, + bool extendable); int rom_add_elf_program(const char *name, void *data, size_t datasize, size_t romsize, hwaddr addr); int rom_load_all(void); @@ -70,7 +71,7 @@ void do_info_roms(Monitor *mon, const QDict *qdict); #define rom_add_file_fixed(_f, _a, _i) \ rom_add_file(_f, NULL, _a, _i, false) #define rom_add_blob_fixed(_f, _b, _l, _a) \ -rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL) +rom_add_blob(_f, _b, _l, _a, NULL, NULL, NULL, false) #define PC_ROM_MIN_VGA 0xc #define PC_ROM_MIN_OPTION 0xc8000