| Message ID | 1457630937-28056-1-git-send-email-berrange@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 03/10/2016 10:28 AM, Daniel P. Berrange wrote: > If QEMU fails to load any of the VGA ROMs, it prints a message > to stderr and then carries on as if everything was fine, despite > the VGA interface not being functional. This extends the the > rom_add_file() method to accept a 'Error **errp' parameter. The > VGA device realizefn() impls can now pass in the errp they already > have and get errors reported as fatal problems. > > Signed-off-by: Daniel P. Berrange <berrange@redhat.com> > --- > hw/core/loader.c | 40 +++++++++++++++++++++++++--------------- > hw/display/cirrus_vga.c | 4 +++- > hw/display/vga-isa.c | 4 +++- > hw/i386/pc.c | 4 ++-- > hw/i386/pc_sysfw.c | 2 +- > hw/misc/sga.c | 4 +++- > hw/pci/pci.c | 8 ++++++-- > include/hw/loader.h | 16 +++++++++------- > 8 files changed, 52 insertions(+), 30 deletions(-) > > diff --git a/hw/core/loader.c b/hw/core/loader.c > index 8e8031c..010e442 100644 > --- a/hw/core/loader.c > +++ b/hw/core/loader.c > @@ -142,7 +142,7 @@ int load_image_targphys(const char *filename, > return -1; > } > if (size > 0) { > - rom_add_file_fixed(filename, addr, -1); > + rom_add_file_fixed(filename, addr, -1, NULL); > } Why is this one ignoring the error? Would &error_abort be better if we know it can't fail? > return size; > } > @@ -162,7 +162,7 @@ int load_image_mr(const char *filename, MemoryRegion *mr) > return -1; > } > if (size > 0) { > - if (rom_add_file_mr(filename, mr, -1) < 0) { > + if (rom_add_file_mr(filename, mr, -1, NULL) < 0) { > return -1; This one still detects and passes on failure, but loses the error message. I guess that's okay, as long as this patch is incrementally better somewhere else. > @@ -847,8 +849,9 @@ int rom_add_file(const char *file, const char *fw_dir, > > fd = open(rom->path, O_RDONLY | O_BINARY); > if (fd == -1) { > - fprintf(stderr, "Could not open option rom '%s': %s\n", > - rom->path, strerror(errno)); > + error_setg_errno(errp, errno, > + "Could not open option rom '%s'", > + rom->path); would error_setg_file_open() be any better here, for consistency? > +++ b/hw/i386/pc.c > @@ -1264,7 +1264,7 @@ void xen_load_linux(PCMachineState *pcms) > for (i = 0; i < nb_option_roms; i++) { > assert(!strcmp(option_rom[i].name, "linuxboot.bin") || > !strcmp(option_rom[i].name, "multiboot.bin")); > - rom_add_option(option_rom[i].name, option_rom[i].bootindex); > + rom_add_option(option_rom[i].name, option_rom[i].bootindex, NULL); Another place that blindly ignores things; should we use &error_abort? > +++ b/hw/i386/pc_sysfw.c > @@ -199,7 +199,7 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) > if (!isapc_ram_fw) { > memory_region_set_readonly(bios, true); > } > - ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); > + ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1, NULL); > if (ret != 0) { > bios_error: > fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); This one makes sense - you are incrementally improving the interface, and not all callers; this caller was already reporting errors and could be cleaned up in a later commit to use &err instead of fprintf().
On Thu, Mar 10, 2016 at 01:25:08PM -0700, Eric Blake wrote: > On 03/10/2016 10:28 AM, Daniel P. Berrange wrote: > > If QEMU fails to load any of the VGA ROMs, it prints a message > > to stderr and then carries on as if everything was fine, despite > > the VGA interface not being functional. This extends the the > > rom_add_file() method to accept a 'Error **errp' parameter. The > > VGA device realizefn() impls can now pass in the errp they already > > have and get errors reported as fatal problems. > > > > Signed-off-by: Daniel P. Berrange <berrange@redhat.com> > > --- > > hw/core/loader.c | 40 +++++++++++++++++++++++++--------------- > > hw/display/cirrus_vga.c | 4 +++- > > hw/display/vga-isa.c | 4 +++- > > hw/i386/pc.c | 4 ++-- > > hw/i386/pc_sysfw.c | 2 +- > > hw/misc/sga.c | 4 +++- > > hw/pci/pci.c | 8 ++++++-- > > include/hw/loader.h | 16 +++++++++------- > > 8 files changed, 52 insertions(+), 30 deletions(-) > > > > diff --git a/hw/core/loader.c b/hw/core/loader.c > > index 8e8031c..010e442 100644 > > --- a/hw/core/loader.c > > +++ b/hw/core/loader.c > > @@ -142,7 +142,7 @@ int load_image_targphys(const char *filename, > > return -1; > > } > > if (size > 0) { > > - rom_add_file_fixed(filename, addr, -1); > > + rom_add_file_fixed(filename, addr, -1, NULL); > > } > > Why is this one ignoring the error? Would &error_abort be better if we > know it can't fail? The loader.h header file has a tonne of different APIs which load files. int get_image_size(const char *filename); int load_image(const char *filename, uint8_t *addr); /* deprecated */ ssize_t load_image_size(const char *filename, void *addr, size_t size); int load_image_targphys(const char *filename, hwaddr, uint64_t max_sz); int load_image_mr(const char *filename, MemoryRegion *mr); int load_image_gzipped_buffer(const char *filename, uint64_t max_sz, uint8_t **buffer); int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz); void load_elf_hdr(const char *filename, void *hdr, bool *is64, Error **errp); int load_aout(const char *filename, hwaddr addr, int max_sz, int bswap_needed, hwaddr target_page_size); int load_uimage(const char *filename, hwaddr *ep, hwaddr *loadaddr, int *is_linux, uint64_t (*translate_fn)(void *, uint64_t), void *translate_opaque); int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz); If I change all those to add an Error **errp, the ripple effect across the rest of QEMU is pretty huge. So I decided it would be better to incrementally convert stuff, starting with the rom_add_* functions first. Converting more of the load_* functions can be a separate followup patch, since this one does not make the situation worse for those. > > @@ -162,7 +162,7 @@ int load_image_mr(const char *filename, MemoryRegion *mr) > > return -1; > > } > > if (size > 0) { > > - if (rom_add_file_mr(filename, mr, -1) < 0) { > > + if (rom_add_file_mr(filename, mr, -1, NULL) < 0) { > > return -1; > > This one still detects and passes on failure, but loses the error > message. I guess that's okay, as long as this patch is incrementally > better somewhere else. See previous explanation. > > @@ -847,8 +849,9 @@ int rom_add_file(const char *file, const char *fw_dir, > > > > fd = open(rom->path, O_RDONLY | O_BINARY); > > if (fd == -1) { > > - fprintf(stderr, "Could not open option rom '%s': %s\n", > > - rom->path, strerror(errno)); > > + error_setg_errno(errp, errno, > > + "Could not open option rom '%s'", > > + rom->path); > > would error_setg_file_open() be any better here, for consistency? Sure. > > > +++ b/hw/i386/pc.c > > @@ -1264,7 +1264,7 @@ void xen_load_linux(PCMachineState *pcms) > > for (i = 0; i < nb_option_roms; i++) { > > assert(!strcmp(option_rom[i].name, "linuxboot.bin") || > > !strcmp(option_rom[i].name, "multiboot.bin")); > > - rom_add_option(option_rom[i].name, option_rom[i].bootindex); > > + rom_add_option(option_rom[i].name, option_rom[i].bootindex, NULL); > > Another place that blindly ignores things; should we use &error_abort? The xen_load_linux() function doesn't have any Error **Errp to propagate the errors back up, so I left that unset. I guess error_abort is a valid alternative, since this is in startup path, not hotplug. > > +++ b/hw/i386/pc_sysfw.c > > @@ -199,7 +199,7 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) > > if (!isapc_ram_fw) { > > memory_region_set_readonly(bios, true); > > } > > - ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); > > + ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1, NULL); > > if (ret != 0) { > > bios_error: > > fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); > > This one makes sense - you are incrementally improving the interface, > and not all callers; this caller was already reporting errors and could > be cleaned up in a later commit to use &err instead of fprintf(). Regards, Daniel
diff --git a/hw/core/loader.c b/hw/core/loader.c index 8e8031c..010e442 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -142,7 +142,7 @@ int load_image_targphys(const char *filename, return -1; } if (size > 0) { - rom_add_file_fixed(filename, addr, -1); + rom_add_file_fixed(filename, addr, -1, NULL); } return size; } @@ -162,7 +162,7 @@ int load_image_mr(const char *filename, MemoryRegion *mr) return -1; } if (size > 0) { - if (rom_add_file_mr(filename, mr, -1) < 0) { + if (rom_add_file_mr(filename, mr, -1, NULL) < 0) { return -1; } } @@ -831,11 +831,13 @@ static void *rom_set_mr(Rom *rom, Object *owner, const char *name) int rom_add_file(const char *file, const char *fw_dir, hwaddr addr, int32_t bootindex, - bool option_rom, MemoryRegion *mr) + bool option_rom, MemoryRegion *mr, + Error **errp) { MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine()); Rom *rom; - int rc, fd = -1; + int fd = -1; + ssize_t rc; char devpath[100]; rom = g_malloc0(sizeof(*rom)); @@ -847,8 +849,9 @@ int rom_add_file(const char *file, const char *fw_dir, fd = open(rom->path, O_RDONLY | O_BINARY); if (fd == -1) { - fprintf(stderr, "Could not open option rom '%s': %s\n", - rom->path, strerror(errno)); + error_setg_errno(errp, errno, + "Could not open option rom '%s'", + rom->path); goto err; } @@ -859,8 +862,9 @@ int rom_add_file(const char *file, const char *fw_dir, rom->addr = addr; rom->romsize = lseek(fd, 0, SEEK_END); if (rom->romsize == -1) { - fprintf(stderr, "rom: file %-20s: get size error: %s\n", - rom->name, strerror(errno)); + error_setg_errno(errp, errno, + "Could not get size of option rom '%s'", + rom->path); goto err; } @@ -868,9 +872,15 @@ int rom_add_file(const char *file, const char *fw_dir, rom->data = g_malloc0(rom->datasize); lseek(fd, 0, SEEK_SET); rc = read(fd, rom->data, rom->datasize); - if (rc != rom->datasize) { - fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n", - rom->name, rc, rom->datasize); + if (rc < 0) { + error_setg_errno(errp, errno, + "Could not read option rom '%s'", + rom->path); + goto err; + } else if (rc != rom->datasize) { + error_setg_errno(errp, errno, + "Short read on option rom '%s' %zd vs %zd", + rom->path, rc, rom->datasize); goto err; } close(fd); @@ -975,14 +985,14 @@ int rom_add_elf_program(const char *name, void *data, size_t datasize, return 0; } -int rom_add_vga(const char *file) +int rom_add_vga(const char *file, Error **errp) { - return rom_add_file(file, "vgaroms", 0, -1, true, NULL); + return rom_add_file(file, "vgaroms", 0, -1, true, NULL, errp); } -int rom_add_option(const char *file, int32_t bootindex) +int rom_add_option(const char *file, int32_t bootindex, Error **errp) { - return rom_add_file(file, "genroms", 0, bootindex, true, NULL); + return rom_add_file(file, "genroms", 0, bootindex, true, NULL, errp); } static void rom_reset(void *unused) diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c index 57b91a7..7fbb2b0 100644 --- a/hw/display/cirrus_vga.c +++ b/hw/display/cirrus_vga.c @@ -2977,7 +2977,9 @@ static void isa_cirrus_vga_realizefn(DeviceState *dev, Error **errp) isa_address_space(isadev), isa_address_space_io(isadev)); s->con = graphic_console_init(dev, 0, s->hw_ops, s); - rom_add_vga(VGABIOS_CIRRUS_FILENAME); + if (rom_add_vga(VGABIOS_CIRRUS_FILENAME, errp) < 0) { + return; + } /* XXX ISA-LFB support */ /* FIXME not qdev yet */ } diff --git a/hw/display/vga-isa.c b/hw/display/vga-isa.c index f5aff1c..4309ae1 100644 --- a/hw/display/vga-isa.c +++ b/hw/display/vga-isa.c @@ -72,7 +72,9 @@ static void vga_isa_realizefn(DeviceState *dev, Error **errp) vga_init_vbe(s, OBJECT(dev), isa_address_space(isadev)); /* ROM BIOS */ - rom_add_vga(VGABIOS_FILENAME); + if (rom_add_vga(VGABIOS_FILENAME, errp) < 0) { + return; + } } static Property vga_isa_properties[] = { diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 56ec6cd..ba4fa67 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1264,7 +1264,7 @@ void xen_load_linux(PCMachineState *pcms) for (i = 0; i < nb_option_roms; i++) { assert(!strcmp(option_rom[i].name, "linuxboot.bin") || !strcmp(option_rom[i].name, "multiboot.bin")); - rom_add_option(option_rom[i].name, option_rom[i].bootindex); + rom_add_option(option_rom[i].name, option_rom[i].bootindex, NULL); } pcms->fw_cfg = fw_cfg; } @@ -1392,7 +1392,7 @@ void pc_memory_init(PCMachineState *pcms, } for (i = 0; i < nb_option_roms; i++) { - rom_add_option(option_rom[i].name, option_rom[i].bootindex); + rom_add_option(option_rom[i].name, option_rom[i].bootindex, NULL); } pcms->fw_cfg = fw_cfg; } diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c index 2324e70..e2c12a7 100644 --- a/hw/i386/pc_sysfw.c +++ b/hw/i386/pc_sysfw.c @@ -199,7 +199,7 @@ static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) if (!isapc_ram_fw) { memory_region_set_readonly(bios, true); } - ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); + ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1, NULL); if (ret != 0) { bios_error: fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); diff --git a/hw/misc/sga.c b/hw/misc/sga.c index 03b006d..f90ad1f 100644 --- a/hw/misc/sga.c +++ b/hw/misc/sga.c @@ -41,7 +41,9 @@ typedef struct ISASGAState { static void sga_realizefn(DeviceState *dev, Error **errp) { - rom_add_vga(SGABIOS_FILENAME); + if (rom_add_vga(SGABIOS_FILENAME, errp) < 0) { + return; + } } static void sga_class_initfn(ObjectClass *klass, void *data) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index e67664d..728a9ec 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -2065,9 +2065,13 @@ static void pci_add_option_rom(PCIDevice *pdev, bool is_default_rom, } if (class == 0x0300) { - rom_add_vga(pdev->romfile); + if (rom_add_vga(pdev->romfile, errp) < 0) { + return; + } } else { - rom_add_option(pdev->romfile, -1); + if (rom_add_option(pdev->romfile, -1, errp) < 0) { + return; + } } return; } diff --git a/include/hw/loader.h b/include/hw/loader.h index 0ba7808..dc9951d 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -2,6 +2,7 @@ #define LOADER_H #include "qapi/qmp/qdict.h" #include "hw/nvram/fw_cfg.h" +#include "qapi/error.h" /* loader.c */ /** @@ -118,7 +119,8 @@ extern bool rom_file_has_mr; int rom_add_file(const char *file, const char *fw_dir, hwaddr addr, int32_t bootindex, - bool option_rom, MemoryRegion *mr); + bool option_rom, MemoryRegion *mr, + Error **errp); MemoryRegion *rom_add_blob(const char *name, const void *blob, size_t len, size_t max_len, hwaddr addr, const char *fw_file_name, @@ -132,12 +134,12 @@ int rom_copy(uint8_t *dest, hwaddr addr, size_t size); void *rom_ptr(hwaddr addr); void hmp_info_roms(Monitor *mon, const QDict *qdict); -#define rom_add_file_fixed(_f, _a, _i) \ - rom_add_file(_f, NULL, _a, _i, false, NULL) +#define rom_add_file_fixed(_f, _a, _i, e) \ + rom_add_file(_f, NULL, _a, _i, false, NULL, e) #define rom_add_blob_fixed(_f, _b, _l, _a) \ rom_add_blob(_f, _b, _l, _l, _a, NULL, NULL, NULL) -#define rom_add_file_mr(_f, _mr, _i) \ - rom_add_file(_f, NULL, 0, _i, false, mr) +#define rom_add_file_mr(_f, _mr, _i, e) \ + rom_add_file(_f, NULL, 0, _i, false, mr, e) #define PC_ROM_MIN_VGA 0xc0000 #define PC_ROM_MIN_OPTION 0xc8000 @@ -145,7 +147,7 @@ void hmp_info_roms(Monitor *mon, const QDict *qdict); #define PC_ROM_ALIGN 0x800 #define PC_ROM_SIZE (PC_ROM_MAX - PC_ROM_MIN_VGA) -int rom_add_vga(const char *file); -int rom_add_option(const char *file, int32_t bootindex); +int rom_add_vga(const char *file, Error **errp); +int rom_add_option(const char *file, int32_t bootindex, Error **errp); #endif
If QEMU fails to load any of the VGA ROMs, it prints a message to stderr and then carries on as if everything was fine, despite the VGA interface not being functional. This extends the the rom_add_file() method to accept a 'Error **errp' parameter. The VGA device realizefn() impls can now pass in the errp they already have and get errors reported as fatal problems. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> --- hw/core/loader.c | 40 +++++++++++++++++++++++++--------------- hw/display/cirrus_vga.c | 4 +++- hw/display/vga-isa.c | 4 +++- hw/i386/pc.c | 4 ++-- hw/i386/pc_sysfw.c | 2 +- hw/misc/sga.c | 4 +++- hw/pci/pci.c | 8 ++++++-- include/hw/loader.h | 16 +++++++++------- 8 files changed, 52 insertions(+), 30 deletions(-)