Re: [Xen-devel] [PATCH] xen: start PCI hole at 0xe0000000 (same as pc_init1 and qemu-xen-traditional)

[Andreas Färber <afaerber@xxxxxxx>]

Am 30.05.2013 15:20, schrieb Stefano Stabellini:
> We are currently setting the PCI hole to start at HVM_BELOW_4G_RAM_END,
> that is 0xf0000000.
> Start the PCI hole at 0xe0000000 instead, that is the same value used by
> pc_init1 and qemu-xen-traditional.
> 
> This fixes a bug with device assignment of graphic cards with large
> amount of video memory (http://marc.info/?l=xen-devel&m=136242365010750).
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> CC: qemu-stable@xxxxxxxxxx
> CC: pbonzini@xxxxxxxxxx
> CC: afaerber@xxxxxxx
> CC: hanweidong@xxxxxxxxxx
> CC: arei.gonglei@xxxxxxxxxx
> ---
>  hw/i386/pc_piix.c    |    6 +++---
>  include/hw/i386/pc.h |    3 +++
>  xen-all.c            |   12 ++++++------
>  3 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 43ab480..06416ce 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -102,9 +102,9 @@ static void pc_init1(MemoryRegion *system_memory,
>          kvmclock_create();
>      }
>  
> -    if (ram_size >= 0xe0000000 ) {
> -        above_4g_mem_size = ram_size - 0xe0000000;
> -        below_4g_mem_size = 0xe0000000;
> +    if (ram_size >= QEMU_BELOW_4G_RAM_END ) {
> +        above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END;
> +        below_4g_mem_size = QEMU_BELOW_4G_RAM_END;
>      } else {
>          above_4g_mem_size = 0;
>          below_4g_mem_size = ram_size;
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 663426c..626442b 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -77,6 +77,9 @@ extern int fd_bootchk;
>  void pc_register_ferr_irq(qemu_irq irq);
>  void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
>  
> +#define QEMU_BELOW_4G_RAM_END       0xe0000000
> +#define QEMU_BELOW_4G_MMIO_LENGTH   ((1ULL << 32) - QEMU_BELOW_4G_RAM_END)
> +
>  void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
>  void pc_hot_add_cpu(const int64_t id, Error **errp);
>  void pc_acpi_init(const char *default_dsdt);
> diff --git a/xen-all.c b/xen-all.c
> index 539a154..5ca0c26 100644
> --- a/xen-all.c
> +++ b/xen-all.c
> @@ -161,18 +161,18 @@ static void xen_ram_init(ram_addr_t ram_size)
>      ram_addr_t block_len;
>  
>      block_len = ram_size;
> -    if (ram_size >= HVM_BELOW_4G_RAM_END) {
> +    if (ram_size >= QEMU_BELOW_4G_RAM_END) {

Is the HVM_ constant still used elsewhere? I don't see it being removed.

Otherwise looks straightforward.

Andreas

>          /* Xen does not allocate the memory continuously, and keep a hole at
> -         * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
> +         * QEMU_BELOW_4G_RAM_END of QEMU_BELOW_4G_MMIO_LENGTH
>           */
> -        block_len += HVM_BELOW_4G_MMIO_LENGTH;
> +        block_len += QEMU_BELOW_4G_MMIO_LENGTH;
>      }
>      memory_region_init_ram(&ram_memory, "xen.ram", block_len);
>      vmstate_register_ram_global(&ram_memory);
>  
> -    if (ram_size >= HVM_BELOW_4G_RAM_END) {
> -        above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
> -        below_4g_mem_size = HVM_BELOW_4G_RAM_END;
> +    if (ram_size >= QEMU_BELOW_4G_RAM_END) {
> +        above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END;
> +        below_4g_mem_size = QEMU_BELOW_4G_RAM_END;
>      } else {
>          below_4g_mem_size = ram_size;
>      }
> 


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