Re: [Qemu-devel] [PATCH RFC 5/8] s390: Make qemu_ram_remap() consistent with allocation

[Paolo Bonzini <pbonzini@redhat.com>]

Il 13/06/2013 03:02, Markus Armbruster ha scritto:
> -static void *legacy_s390_alloc(ram_addr_t size)
> +
> +static void *legacy_s390_mmap(void *vaddr, ram_addr_t size)
>  {
> -    void *mem;
> +    return mmap(vaddr, size, PROT_EXEC | PROT_READ | PROT_WRITE,
> +                MAP_FIXED | MAP_SHARED | MAP_ANONYMOUS, -1, 0);
> +}
>  
> -    mem = mmap((void *) 0x800000000ULL, size,
> -               PROT_EXEC|PROT_READ|PROT_WRITE,
> -               MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);

You can just turn kvm_arch_mem_alloc to kvm_arch_ram_mmap, and call it
from both kvm_mem_alloc and a new kvm_mem_remap.  Then s390 can do

    mmap(vaddr ? vaddr : (void *) 0x800000000ULL,
         size, PROT_EXEC | PROT_READ | PROT_WRITE,
         MAP_FIXED | MAP_SHARED | MAP_ANONYMOUS, -1, 0);

and other arches can still return NULL.

Paolo