[Qemu-devel] Re: [RFC PATCH 3/6] RAMBlock: Add a name field

[Anthony Liguori <anthony@codemonkey.ws>]

On 06/08/2010 02:15 PM, Alex Williamson wrote:
> The offset given to a block created via qemu_ram_alloc/map() is arbitrary,
> let the caller specify a name so we can make a positive match.
>
> Note, this only addresses the qemu-kvm callers so far.
>
> Signed-off-by: Alex Williamson<alex.williamson@redhat.com>
> ---
>
>   cpu-all.h              |    1 +
>   cpu-common.h           |    4 ++--
>   exec.c                 |    8 +++++---
>   hw/device-assignment.c |    8 ++++++--
>   hw/pc.c                |    8 ++++----
>   hw/pci.c               |    5 ++++-
>   hw/vga.c               |    2 +-
>   hw/vmware_vga.c        |    2 +-
>   8 files changed, 24 insertions(+), 14 deletions(-)
>
> diff --git a/cpu-all.h b/cpu-all.h
> index 458cb4b..a5b886a 100644
> --- a/cpu-all.h
> +++ b/cpu-all.h
> @@ -865,6 +865,7 @@ typedef struct RAMBlock {
>       uint8_t *host;
>       ram_addr_t offset;
>       ram_addr_t length;
> +    char name[64];
>       QLIST_ENTRY(RAMBlock) next;
>   } RAMBlock;
>
> diff --git a/cpu-common.h b/cpu-common.h
> index 4b0ba60..5b00544 100644
> --- a/cpu-common.h
> +++ b/cpu-common.h
> @@ -40,8 +40,8 @@ static inline void cpu_register_physical_memory(target_phys_addr_t start_addr,
>   }
>
>   ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
> -ram_addr_t qemu_ram_map(ram_addr_t size, void *host);
> -ram_addr_t qemu_ram_alloc(ram_addr_t);
> +ram_addr_t qemu_ram_map(const char *name, ram_addr_t size, void *host);
> +ram_addr_t qemu_ram_alloc(const char *name, ram_addr_t);
>   void qemu_ram_free(ram_addr_t addr);
>   /* This should only be used for ram local to a device.  */
>   void *qemu_get_ram_ptr(ram_addr_t addr);
> diff --git a/exec.c b/exec.c
> index d785de3..dd57515 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -2774,13 +2774,15 @@ static void *file_ram_alloc(ram_addr_t memory, const char *path)
>   }
>   #endif
>
> -ram_addr_t qemu_ram_map(ram_addr_t size, void *host)
> +ram_addr_t qemu_ram_map(const char *name, ram_addr_t size, void *host)
>   {
>       RAMBlock *new_block;
>
>       size = TARGET_PAGE_ALIGN(size);
>       new_block = qemu_malloc(sizeof(*new_block));
>
> +    // XXX check duplicates
> +    snprintf(new_block->name, sizeof(new_block->name), "%s", strdup(name));
>    

That strdup() is probably unintentional.

>       new_block->host = host;
>
>       new_block->offset = ram.last_offset;
> @@ -2801,7 +2803,7 @@ ram_addr_t qemu_ram_map(ram_addr_t size, void *host)
>       return new_block->offset;
>   }
>
> -ram_addr_t qemu_ram_alloc(ram_addr_t size)
> +ram_addr_t qemu_ram_alloc(const char *name, ram_addr_t size)
>   {
>       void *host;
>
> @@ -2833,7 +2835,7 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
>   #endif
>       }
>
> -    return qemu_ram_map(size, host);
> +    return qemu_ram_map(name, size, host);
>   }
>
>   void qemu_ram_free(ram_addr_t addr)
> diff --git a/hw/device-assignment.c b/hw/device-assignment.c
> index 2b963b5..1d631f6 100644
> --- a/hw/device-assignment.c
> +++ b/hw/device-assignment.c
> @@ -569,9 +569,13 @@ static int assigned_dev_register_regions(PCIRegion *io_regions,
>
>               if (!slow_map) {
>                   void *virtbase = pci_dev->v_addrs[i].u.r_virtbase;
> +                char name[14];
>
> -                pci_dev->v_addrs[i].memory_index = qemu_ram_map(cur_region->size,
> -                                                                virtbase);
> +                snprintf(name, sizeof(name), "pci:%02x.%x.bar%d",
> +                         PCI_SLOT(pci_dev->dev.devfn),
> +                         PCI_FUNC(pci_dev->dev.devfn), i);
> +                pci_dev->v_addrs[i].memory_index = qemu_ram_map(name,
> +                                                  cur_region->size, virtbase);
>               } else
>                   pci_dev->v_addrs[i].memory_index = 0;
>
> diff --git a/hw/pc.c b/hw/pc.c
> index eae0db4..76be151 100644
> --- a/hw/pc.c
> +++ b/hw/pc.c
> @@ -834,7 +834,7 @@ void pc_memory_init(ram_addr_t ram_size,
>       linux_boot = (kernel_filename != NULL);
>
>       /* allocate RAM */
> -    ram_addr = qemu_ram_alloc(below_4g_mem_size);
> +    ram_addr = qemu_ram_alloc("ram.pc.lowmem", below_4g_mem_size);
>       cpu_register_physical_memory(0, 0xa0000, ram_addr);
>       cpu_register_physical_memory(0x100000,
>                    below_4g_mem_size - 0x100000,
> @@ -845,7 +845,7 @@ void pc_memory_init(ram_addr_t ram_size,
>   #if TARGET_PHYS_ADDR_BITS == 32
>           hw_error("To much RAM for 32-bit physical address");
>   #else
> -        ram_addr = qemu_ram_alloc(above_4g_mem_size);
> +        ram_addr = qemu_ram_alloc("ram.pc.highmem", above_4g_mem_size);
>           cpu_register_physical_memory(0x100000000ULL,
>                                        above_4g_mem_size,
>                                        ram_addr);
> @@ -866,7 +866,7 @@ void pc_memory_init(ram_addr_t ram_size,
>           (bios_size % 65536) != 0) {
>           goto bios_error;
>       }
> -    bios_offset = qemu_ram_alloc(bios_size);
> +    bios_offset = qemu_ram_alloc("ram.pc.bios", bios_size);
>       ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size));
>       if (ret != 0) {
>       bios_error:
> @@ -892,7 +892,7 @@ void pc_memory_init(ram_addr_t ram_size,
>       }
>       option_rom[nb_option_roms++] = qemu_strdup(VAPIC_FILENAME);
>
> -    option_rom_offset = qemu_ram_alloc(PC_ROM_SIZE);
> +    option_rom_offset = qemu_ram_alloc("ram.pc.rom", PC_ROM_SIZE);
>       cpu_register_physical_memory(PC_ROM_MIN_VGA, PC_ROM_SIZE, option_rom_offset);
>
>       /* map all the bios at the top of memory */
> diff --git a/hw/pci.c b/hw/pci.c
> index f0b6790..b2632a8 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -1889,6 +1889,7 @@ static int pci_add_option_rom(PCIDevice *pdev)
>       int size;
>       char *path;
>       void *ptr;
> +    char name[13];
>
>       if (!pdev->romfile)
>           return 0;
> @@ -1924,7 +1925,9 @@ static int pci_add_option_rom(PCIDevice *pdev)
>           size = 1<<  qemu_fls(size);
>       }
>
> -    pdev->rom_offset = qemu_ram_alloc(size);
> +    snprintf(name, sizeof(name), "pci:%02x.%x.rom",
> +             PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
> +    pdev->rom_offset = qemu_ram_alloc(name, size);
>
>       ptr = qemu_get_ram_ptr(pdev->rom_offset);
>       load_image(path, ptr);
> diff --git a/hw/vga.c b/hw/vga.c
> index 0a535ae..47b800f 100644
> --- a/hw/vga.c
> +++ b/hw/vga.c
> @@ -2292,7 +2292,7 @@ void vga_common_init(VGACommonState *s, int vga_ram_size)
>   #else
>       s->is_vbe_vmstate = 0;
>   #endif
> -    s->vram_offset = qemu_ram_alloc(vga_ram_size);
> +    s->vram_offset = qemu_ram_alloc("ram.vga.vram", vga_ram_size);
>       s->vram_ptr = qemu_get_ram_ptr(s->vram_offset);
>       s->vram_size = vga_ram_size;
>       s->get_bpp = vga_get_bpp;
> diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c
> index bf2a699..9df8c08 100644
> --- a/hw/vmware_vga.c
> +++ b/hw/vmware_vga.c
> @@ -1164,7 +1164,7 @@ static void vmsvga_init(struct vmsvga_state_s *s, int vga_ram_size)
>
>
>       s->fifo_size = SVGA_FIFO_SIZE;
> -    s->fifo_offset = qemu_ram_alloc(s->fifo_size);
> +    s->fifo_offset = qemu_ram_alloc("ram.vmsvga.fifo", s->fifo_size);
>       s->fifo_ptr = qemu_get_ram_ptr(s->fifo_offset);
>
>       vga_common_init(&s->vga, vga_ram_size);
>    

Regards,

Anthony Liguori