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Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent |
Date: |
Wed, 17 Jun 2015 18:15:14 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 17/06/2015 17:10, Michael S. Tsirkin wrote:
> > Actually memory_region_add_subregion(cannot fail) will continue to casue
> > problems
> > in case one of the listeners fails and has no way to propagate error up the
> > stack.
> > It could be that vhost_set_memory() or kvm_set_memslots() aren't able to
> > allocate
> > memory for replacement table in low memory conditions and without
> > way to report back QEMU is left with option to die.
>
> mmap reserving memory just adds it to a data structure somewhere
> within glibc, doesn't it? Looks like it's highly unlikely to fail,
> so maybe killing QEMU if it does isn't a big deal.
It's in the kernel, but yes, a MAP_NORESERVE mmap is highly unlikely to
fail.
Paolo
- [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, (continued)
- [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Igor Mammedov, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Paolo Bonzini, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Paolo Bonzini, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Igor Mammedov, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Michael S. Tsirkin, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Paolo Bonzini, 2015/06/08
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Igor Mammedov, 2015/06/09
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Paolo Bonzini, 2015/06/17
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Igor Mammedov, 2015/06/17
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Michael S. Tsirkin, 2015/06/17
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent,
Paolo Bonzini <=
- Re: [Qemu-devel] [RFC v2 3/6] memory: support unmapping of MemoryRegion mapped into HVA parent, Michael S. Tsirkin, 2015/06/17
[Qemu-devel] [RFC v2 2/6] memory: introduce MemoryRegion container with reserved HVA range, Igor Mammedov, 2015/06/08
[Qemu-devel] [RFC v2 6/6] pc: fix QEMU crashing when more than ~50 memory hotplugged, Igor Mammedov, 2015/06/08
[Qemu-devel] [RFC v2 5/6] pc: reserve hotpluggable memory range with memory_region_init_hva_range(), Igor Mammedov, 2015/06/08