Stefan Hajnoczi writes:
> On Mon, Sep 26, 2011 at 08:03:12PM +0200, Lluís Vilanova wrote:
>> #if 1 /* KVM doesn't like it */
>> s-> data_ptr = g_malloc(s->size);
>> memory_region_init_ram_ptr(&s->data, &s->dev.qdev, "backdoor.data",
>> s-> size, s->data_ptr);
>> pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->data);
>> #endif
> Have you tried page-aligning data_ptr with qemu_memalign() or doing an
> anonymous mmap instead of g_malloc()?
> From virt/kvm/kvm_main.c:__kvm_set_memory_region():
> /* General sanity checks */
> if (mem->memory_size & (PAGE_SIZE - 1))
> goto out;
> if (mem->guest_phys_addr & (PAGE_SIZE - 1))
> goto out;
> /* We can read the guest memory with __xxx_user() later on. */
> if (user_alloc &&
> ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
> !access_ok(VERIFY_WRITE,
> (void __user *)(unsigned long)mem->userspace_addr, mem->
> memory_size)))
> goto out;
Damn! It's so obvious I even feel ashamed :)
Thanks a lot,
Lluis
--
"And it's much the same thing with knowledge, for whenever you learn
something new, the whole world becomes that much richer."
-- The Princess of Pure Reason, as told by Norton Juster in The Phantom
Tollbooth
