[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: A

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set)
Date: Thu, 23 Jun 2016 01:44:06 +0300

On Wed, Jun 22, 2016 at 04:24:14PM +0200, Andrea Arcangeli wrote:
> > cause malfunctioning, only crashes (and as Gerd said, if you cross your
> > fingers and hope the guest doesn't put anything so high in memory,
> > chances are you'll succeed), and this makes it "safer".  I'm not sure
> > which one is more likely to happen.
> But the crash with guest phys bits > host phys bits is material, linux
> will definitely crash in such condition.

Why would it? Most GPA addresses are not guest controllable.
Don't give guest addresses that host can't access, you will not get
a crash.

The only exception I know of is PCI BARs but we can limit
these to a safe addressable range using _CRS method in ACPI.

Could you explain please?


reply via email to

[Prev in Thread] Current Thread [Next in Thread]