From: Paul Mackerras <paulus@samba.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "qemu-ppc@nongnu.org list:PowerPC" <qemu-ppc@nongnu.org>,
Alexander Graf <agraf@suse.de>,
QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH -V7 3/3] target-ppc: Fix page table lookup with kvm enabled
Date: Thu, 19 Dec 2013 19:41:22 +1100 [thread overview]
Message-ID: <20131219084122.GA6244@iris.ozlabs.ibm.com> (raw)
In-Reply-To: <87eh599vnm.fsf@linux.vnet.ibm.com>
On Thu, Dec 19, 2013 at 12:25:57PM +0530, Aneesh Kumar K.V wrote:
> Alexander Graf <agraf@suse.de> writes:
>
> > This breaks if you run a 64-bit guest on a 32-bit host trying to
> > access memory beyond 4GB. In that case htab_base is hwaddr (64bit)
> > while uint8_t is only 32bit wide.
>
> Wow!! didn't know that is possible.
I don't believe it is. All of the 64-bit instructions would trap and
we don't have code to emulate them (and even if we did, it would be
painfully slow given that there would be a lot of them).
Paul.
next prev parent reply other threads:[~2013-12-19 8:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-07 14:31 [Qemu-devel] [PATCH -V7 1/3] target-ppc: Update external_htab even when HTAB is managed by kernel Aneesh Kumar K.V
2013-11-07 14:31 ` [Qemu-devel] [PATCH -V7 2/3] target-ppc: Fix htab_mask calculation Aneesh Kumar K.V
2013-11-07 14:31 ` [Qemu-devel] [PATCH -V7 3/3] target-ppc: Fix page table lookup with kvm enabled Aneesh Kumar K.V
2013-12-18 9:49 ` Alexander Graf
2013-12-19 6:55 ` Aneesh Kumar K.V
2013-12-19 8:41 ` Paul Mackerras [this message]
2013-12-19 15:27 ` Alexander Graf
2013-12-20 5:24 ` Aneesh Kumar K.V
2013-12-20 10:53 ` Alexander Graf
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