From 75f01c68b5c630a9a6b21b93febf3a871a9111ba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Sat, 15 Jan 2022 21:37:23 +0100 Subject: [PATCH 1/3] exec/memory: Extract address_space_set() from dma_memory_set() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit dma_memory_set() does a DMA barrier, set the address space with a constant value. The constant value filling code is not specific to DMA and can be used for AddressSpace. Extract it as a new helper: address_space_set(). Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Laurent Vivier Reviewed-by: Stefano Garzarella Reviewed-by: Richard Henderson [lv: rebase] Signed-off-by: Laurent Vivier Reviewed-by: David Hildenbrand Reviewed-by: Peter Xu Message-Id: <20220115203725.3834712-2-laurent@vivier.eu> --- include/exec/memory.h | 16 ++++++++++++++++ softmmu/dma-helpers.c | 15 +-------------- softmmu/physmem.c | 19 +++++++++++++++++++ 3 files changed, 36 insertions(+), 14 deletions(-) diff --git a/include/exec/memory.h b/include/exec/memory.h index 63be794a06..4d5997e6bb 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2908,6 +2908,22 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr, } } +/** + * address_space_set: Fill address space with a constant byte. + * + * Return a MemTxResult indicating whether the operation succeeded + * or failed (eg unassigned memory, device rejected the transaction, + * IOMMU fault). + * + * @as: #AddressSpace to be accessed + * @addr: address within that address space + * @c: constant byte to fill the memory + * @len: the number of bytes to fill with the constant byte + * @attrs: memory transaction attributes + */ +MemTxResult address_space_set(AddressSpace *as, hwaddr addr, + uint8_t c, hwaddr len, MemTxAttrs attrs); + #ifdef NEED_CPU_H /* enum device_endian to MemOp. */ static inline MemOp devend_memop(enum device_endian end) diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c index 1c6fba6a11..160095e4ba 100644 --- a/softmmu/dma-helpers.c +++ b/softmmu/dma-helpers.c @@ -23,20 +23,7 @@ MemTxResult dma_memory_set(AddressSpace *as, dma_addr_t addr, { dma_barrier(as, DMA_DIRECTION_FROM_DEVICE); -#define FILLBUF_SIZE 512 - uint8_t fillbuf[FILLBUF_SIZE]; - int l; - MemTxResult error = MEMTX_OK; - - memset(fillbuf, c, FILLBUF_SIZE); - while (len > 0) { - l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE; - error |= address_space_write(as, addr, attrs, fillbuf, l); - len -= l; - addr += l; - } - - return error; + return address_space_set(as, addr, c, len, attrs); } void qemu_sglist_init(QEMUSGList *qsg, DeviceState *dev, int alloc_hint, diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 3524c04c2a..dddf70edf5 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -2927,6 +2927,25 @@ MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, } } +MemTxResult address_space_set(AddressSpace *as, hwaddr addr, + uint8_t c, hwaddr len, MemTxAttrs attrs) +{ +#define FILLBUF_SIZE 512 + uint8_t fillbuf[FILLBUF_SIZE]; + int l; + MemTxResult error = MEMTX_OK; + + memset(fillbuf, c, FILLBUF_SIZE); + while (len > 0) { + l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE; + error |= address_space_write(as, addr, attrs, fillbuf, l); + len -= l; + addr += l; + } + + return error; +} + void cpu_physical_memory_rw(hwaddr addr, void *buf, hwaddr len, bool is_write) { From b4c4c1f1129a5d9dcbcbff46b58998f6fb1410bb Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Sat, 15 Jan 2022 21:37:24 +0100 Subject: [PATCH 2/3] hw/elf_ops: clear uninitialized segment space MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When the mem_size of the segment is bigger than the file_size, and if this space doesn't overlap another segment, it needs to be cleared. This bug is very similar to the one we had for linux-user, 22d113b52f41 ("linux-user: Fix loading of BSS segments"), where .bss section is encoded as an extension of the the data one by setting the segment p_memsz > p_filesz. Signed-off-by: Laurent Vivier [PMD: Use recently added address_space_set()] Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Stefano Garzarella Reviewed-by: Richard Henderson Message-Id: <20220115203725.3834712-3-laurent@vivier.eu> --- hw/core/loader.c | 4 ++++ include/hw/elf_ops.h | 13 +++++++++++++ 2 files changed, 17 insertions(+) diff --git a/hw/core/loader.c b/hw/core/loader.c index 052a0fd719..19edb928e9 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -1164,9 +1164,13 @@ static void rom_reset(void *unused) if (rom->mr) { void *host = memory_region_get_ram_ptr(rom->mr); memcpy(host, rom->data, rom->datasize); + memset(host + rom->datasize, 0, rom->romsize - rom->datasize); } else { address_space_write_rom(rom->as, rom->addr, MEMTXATTRS_UNSPECIFIED, rom->data, rom->datasize); + address_space_set(rom->as, rom->addr + rom->datasize, 0, + rom->romsize - rom->datasize, + MEMTXATTRS_UNSPECIFIED); } if (rom->isrom) { /* rom needs to be written only once */ diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h index 995de8495c..7c3b1d0f6c 100644 --- a/include/hw/elf_ops.h +++ b/include/hw/elf_ops.h @@ -555,6 +555,19 @@ static ssize_t glue(load_elf, SZ)(const char *name, int fd, if (res != MEMTX_OK) { goto fail; } + /* + * We need to zero'ify the space that is not copied + * from file + */ + if (file_size < mem_size) { + res = address_space_set(as ? as : &address_space_memory, + addr + file_size, 0, + mem_size - file_size, + MEMTXATTRS_UNSPECIFIED); + if (res != MEMTX_OK) { + goto fail; + } + } } } From e48b140eef9775986cc18038c7bc68f8d2b7fe1d Mon Sep 17 00:00:00 2001 From: Laurent Vivier Date: Sat, 15 Jan 2022 21:37:25 +0100 Subject: [PATCH 3/3] m68k: virt: correctly set the initial PC According to QEMU parameter, set initial PC to the entry of the loaded kernel. Signed-off-by: Laurent Vivier Message-Id: <20220115203725.3834712-4-laurent@vivier.eu> --- hw/m68k/virt.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/hw/m68k/virt.c b/hw/m68k/virt.c index 78e926a554..bbaf630bbf 100644 --- a/hw/m68k/virt.c +++ b/hw/m68k/virt.c @@ -85,14 +85,21 @@ #define VIRT_VIRTIO_MMIO_BASE 0xff010000 /* MMIO: 0xff010000 - 0xff01ffff */ #define VIRT_VIRTIO_IRQ_BASE PIC_IRQ(2, 1) /* PIC: 2, 3, 4, 5, IRQ: ALL */ +typedef struct { + M68kCPU *cpu; + hwaddr initial_pc; + hwaddr initial_stack; +} ResetInfo; + static void main_cpu_reset(void *opaque) { - M68kCPU *cpu = opaque; + ResetInfo *reset_info = opaque; + M68kCPU *cpu = reset_info->cpu; CPUState *cs = CPU(cpu); cpu_reset(cs); - cpu->env.aregs[7] = ldl_phys(cs->as, 0); - cpu->env.pc = ldl_phys(cs->as, 4); + cpu->env.aregs[7] = reset_info->initial_stack; + cpu->env.pc = reset_info->initial_pc; } static void virt_init(MachineState *machine) @@ -113,6 +120,7 @@ static void virt_init(MachineState *machine) SysBusDevice *sysbus; hwaddr io_base; int i; + ResetInfo *reset_info; if (ram_size > 3399672 * KiB) { /* @@ -124,9 +132,13 @@ static void virt_init(MachineState *machine) exit(1); } + reset_info = g_malloc0(sizeof(ResetInfo)); + /* init CPUs */ cpu = M68K_CPU(cpu_create(machine->cpu_type)); - qemu_register_reset(main_cpu_reset, cpu); + + reset_info->cpu = cpu; + qemu_register_reset(main_cpu_reset, reset_info); /* RAM */ memory_region_add_subregion(get_system_memory(), 0, machine->ram); @@ -206,7 +218,7 @@ static void virt_init(MachineState *machine) error_report("could not load kernel '%s'", kernel_filename); exit(1); } - stl_phys(cs->as, 4, elf_entry); /* reset initial PC */ + reset_info->initial_pc = elf_entry; parameters_base = (high + 1) & ~1; BOOTINFO1(cs->as, parameters_base, BI_MACHTYPE, MACH_VIRT);