• Igor Mammedov's avatar
    kvm: avoid page allocation failure in kvm_set_memory_region() · 74496134
    Igor Mammedov authored
    KVM guest can fail to startup with following trace on host:
    
    qemu-system-x86: page allocation failure: order:4, mode:0x40d0
    Call Trace:
      dump_stack+0x47/0x67
      warn_alloc_failed+0xee/0x150
      __alloc_pages_direct_compact+0x14a/0x150
      __alloc_pages_nodemask+0x776/0xb80
      alloc_kmem_pages+0x3a/0x110
      kmalloc_order+0x13/0x50
      kmemdup+0x1b/0x40
      __kvm_set_memory_region+0x24a/0x9f0 [kvm]
      kvm_set_ioapic+0x130/0x130 [kvm]
      kvm_set_memory_region+0x21/0x40 [kvm]
      kvm_vm_ioctl+0x43f/0x750 [kvm]
    
    Failure happens when attempting to allocate pages for
    'struct kvm_memslots', however it doesn't have to be
    present in physically contiguous (kmalloc-ed) address
    space, change allocation to kvm_kvzalloc() so that
    it will be vmalloc-ed when its size is more then a page.
    Signed-off-by: default avatarIgor Mammedov <imammedo@redhat.com>
    Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
    74496134
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