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Re: [Qemu-devel] [PATCH v2 5/6] x86: fix up 32 bit phys_bits case
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2 5/6] x86: fix up 32 bit phys_bits case |
Date: |
Tue, 5 Jul 2016 12:29:30 +0100 |
User-agent: |
Mutt/1.6.1 (2016-04-27) |
* Daniel P. Berrange (address@hidden) wrote:
> On Mon, Jul 04, 2016 at 08:16:08PM +0100, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <address@hidden>
> >
> > On 32 bit systems fix up phys_bits to be consistent with what
> > we tell the guest; don't ever bother with using the phys_bits
> > property.
>
> > @@ -2990,6 +2986,15 @@ static void x86_cpu_realizefn(DeviceState *dev,
> > Error **errp)
> > cpu->phys_bits = host_phys_bits;
> >
> > }
> > + } else {
> > + /* For 32 bit systems don't use the user set value, but keep
> > + * phys_bits consistent with what we tell the guest.
> > + */
> > + if (env->features[FEAT_1_EDX] & CPUID_PSE36) {
> > + cpu->phys_bits = 36;
> > + } else {
> > + cpu->phys_bits = 32;
> > + }
>
> I kind of feel like we should report an error and exit if the
> user/app has provided a phys_bits property value, rather than
> silently ignoring their provided value, on the basis that this
> is a user/app configuration error.
Do we have an easy way to tell that the user has set the parameter
as opposed to it being the default?
Dave
> Regards,
> Daniel
> --
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--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2 3/6] x86: fill high bits of mtrr mask, (continued)
[Qemu-devel] [PATCH v2 6/6] x86: Add sanity checks on phys_bits, Dr. David Alan Gilbert (git), 2016/07/04
Re: [Qemu-devel] [PATCH v2 0/6] x86: Physical address limit patches, Michael S. Tsirkin, 2016/07/04