Symptom: $ qemu-system-x86_64 -m 10000000 Unexpected error in ram_block_add() at /work/armbru/qemu/exec.c:1456: upstream-qemu: cannot set up guest memory 'pc.ram': Cannot allocate memory Aborted (core dumped) Root cause: commitef701d7
screwed up handling of out-of-memory conditions. Before the commit, we report the error and exit(1), in one place, ram_block_add(). The commit lifts the error handling up the call chain some, to three places. Fine. Except it uses &error_abort in these places, changing the behavior from exit(1) to abort(), and thus undoing the work of commit3922825
"exec: Don't abort when we can't allocate guest memory". The three places are: * memory_region_init_ram() Commit4994653
(right after commitef701d7
) lifted the error handling further, through memory_region_init_ram(), multiplying the incorrect use of &error_abort. Later on, imitation of existing (bad) code may have created more. * memory_region_init_ram_ptr() The &error_abort is still there. * memory_region_init_rom_device() Doesn't need fixing, because commit33e0eb5
(soon after commitef701d7
) lifted the error handling further, and in the process changed it from &error_abort to passing it up the call chain. Correct, because the callers are realize() methods. Fix the error handling after memory_region_init_ram() with a Coccinelle semantic patch: @r@ expression mr, owner, name, size, err; position p; @@ memory_region_init_ram(mr, owner, name, size, ( - &error_abort + &error_fatal | err@p ) ); @script:python@ p << r.p; @@ print "%s:%s:%s" % (p[0].file, p[0].line, p[0].column) When the last argument is &error_abort, it gets replaced by &error_fatal. This is the fix. If the last argument is anything else, its position is reported. This lets us check the fix is complete. Four positions get reported: * ram_backend_memory_alloc() Error is passed up the call chain, ultimately through user_creatable_complete(). As far as I can tell, it's callers all handle the error sanely. * fsl_imx25_realize(), fsl_imx31_realize(), dp8393x_realize() DeviceClass.realize() methods, errors handled sanely further up the call chain. We're good. Test case again behaves: $ qemu-system-x86_64 -m 10000000 qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot allocate memory [Exit 1 ] The next commits will repair the rest of commit ef701d7's damage. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1441983105-26376-3-git-send-email-armbru@redhat.com> Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
121 lines
4.1 KiB
C
121 lines
4.1 KiB
C
/*
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* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the Open Source and Linux Lab nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "sysemu/sysemu.h"
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#include "hw/boards.h"
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#include "hw/loader.h"
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#include "elf.h"
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#include "exec/memory.h"
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#include "exec/address-spaces.h"
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#include "qemu/error-report.h"
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static uint64_t translate_phys_addr(void *opaque, uint64_t addr)
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{
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XtensaCPU *cpu = opaque;
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return cpu_get_phys_page_debug(CPU(cpu), addr);
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}
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static void sim_reset(void *opaque)
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{
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XtensaCPU *cpu = opaque;
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cpu_reset(CPU(cpu));
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}
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static void xtensa_sim_init(MachineState *machine)
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{
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XtensaCPU *cpu = NULL;
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CPUXtensaState *env = NULL;
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MemoryRegion *ram, *rom;
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ram_addr_t ram_size = machine->ram_size;
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const char *cpu_model = machine->cpu_model;
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const char *kernel_filename = machine->kernel_filename;
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int n;
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if (!cpu_model) {
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cpu_model = XTENSA_DEFAULT_CPU_MODEL;
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}
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for (n = 0; n < smp_cpus; n++) {
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cpu = cpu_xtensa_init(cpu_model);
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if (cpu == NULL) {
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error_report("unable to find CPU definition '%s'",
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cpu_model);
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exit(EXIT_FAILURE);
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}
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env = &cpu->env;
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env->sregs[PRID] = n;
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qemu_register_reset(sim_reset, cpu);
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/* Need MMU initialized prior to ELF loading,
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* so that ELF gets loaded into virtual addresses
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*/
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sim_reset(cpu);
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}
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ram = g_malloc(sizeof(*ram));
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memory_region_init_ram(ram, NULL, "xtensa.sram", ram_size, &error_fatal);
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vmstate_register_ram_global(ram);
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memory_region_add_subregion(get_system_memory(), 0, ram);
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rom = g_malloc(sizeof(*rom));
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memory_region_init_ram(rom, NULL, "xtensa.rom", 0x1000, &error_fatal);
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vmstate_register_ram_global(rom);
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memory_region_add_subregion(get_system_memory(), 0xfe000000, rom);
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if (kernel_filename) {
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uint64_t elf_entry;
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uint64_t elf_lowaddr;
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#ifdef TARGET_WORDS_BIGENDIAN
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int success = load_elf(kernel_filename, translate_phys_addr, cpu,
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&elf_entry, &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);
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#else
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int success = load_elf(kernel_filename, translate_phys_addr, cpu,
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&elf_entry, &elf_lowaddr, NULL, 0, ELF_MACHINE, 0);
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#endif
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if (success > 0) {
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env->pc = elf_entry;
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}
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}
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}
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static QEMUMachine xtensa_sim_machine = {
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.name = "sim",
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.desc = "sim machine (" XTENSA_DEFAULT_CPU_MODEL ")",
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.is_default = true,
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.init = xtensa_sim_init,
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.max_cpus = 4,
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};
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static void xtensa_sim_machine_init(void)
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{
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qemu_register_machine(&xtensa_sim_machine);
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}
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machine_init(xtensa_sim_machine_init);
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