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Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capab
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability |
Date: |
Fri, 10 Jul 2015 16:59:19 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0.1 |
On 10/07/2015 16:57, Laszlo Ersek wrote:
> > > ... In any case, please understand that I'm not campaigning for this
> > > warning :) IIRC the warning was your (very welcome!) idea after I
> > > reported the problem; I'm just trying to ensure that the warning match
> > > the exact issue I encountered.
> >
> > Yup. I think the right thing to do would be to hide memory above the
> > limit.
> How so?
>
> - The stack would not be doing what the user asks for. Pass -m <a_lot>,
> and the guest would silently see less memory. If the user found out,
> he'd immediately ask (or set out debugging) why. I think if the user's
> request cannot be satisfied, the stack should fail hard.
That's another possibility. I think both of them are wrong depending on
_why_ you're using "-m <a lot>" in the first place.
Considering that this really happens (on Xeons) only for 1TB+ guests,
it's probably just for debugging and then hiding the memory makes some
sense.
Paolo
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, (continued)
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Paolo Bonzini, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Laszlo Ersek, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Paolo Bonzini, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Bandan Das, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Laszlo Ersek, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Bandan Das, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Laszlo Ersek, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Bandan Das, 2015/07/09
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Paolo Bonzini, 2015/07/10
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Laszlo Ersek, 2015/07/10
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Laszlo Ersek, 2015/07/10
- Re: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability, Bandan Das, 2015/07/10