From: "H. Peter Anvin" <hpa@zytor.com>
To: Amit Shah <amit.shah@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Ted Ts'o <tytso@mit.edu>,
Dustin Kirkland <kirkland@canonical.com>,
qemu-devel@nongnu.org, George Wilson <gcwilson@us.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Kent Yoder <key@linux.vnet.ibm.com>,
Andreas Faerber <afaerber@suse.de>
Subject: Re: [Qemu-devel] [PATCH 0/6] add paravirtualization hwrng support
Date: Mon, 29 Oct 2012 21:32:24 -0700 [thread overview]
Message-ID: <508F5858.5050606@zytor.com> (raw)
In-Reply-To: <20121029062308.GA3564@amit.redhat.com>
On 10/28/2012 11:23 PM, Amit Shah wrote:
> One solution could be to feed host's /dev/urandom to readers of
> guests' /dev/urandom. We could then pass the rare true entropy bits
> from host's /dev/hwrng or /dev/random to the guest via
> virtio-rng-pci's /dev/hwrng interface in the guest.
>
> If this is a valid idea (host /dev/urandom goes directly to guest's
> /dev/urandom), we would need some guest-side surgery, but it shouldn't
> be huge work, and would remove several bottlenecks.
>
> Is this a very crazy idea?
It's not crazy, it's just pointless. You're doing a completely
unnecessary hypercall to run the PRNG in host space.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-10-30 4:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 14:43 [Qemu-devel] [PATCH 0/6] add paravirtualization hwrng support Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 1/6] vl: add -object option to create QOM objects from the command line Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 2/6] object: add object_property_add_bool (v2) Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 3/6] rng: add RndBackend abstract object class Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 4/6] rng-random: add an RNG backend that uses /dev/random Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 5/6] rng-egd: introduce EGD compliant RNG backend Anthony Liguori
2012-10-26 14:43 ` [Qemu-devel] [PATCH 6/6] virtio-rng: hardware random number generator device Anthony Liguori
2012-10-26 15:08 ` [Qemu-devel] [PATCH 0/6] add paravirtualization hwrng support Paolo Bonzini
2012-10-26 15:42 ` Anthony Liguori
2012-10-26 16:09 ` H. Peter Anvin
2012-10-26 18:24 ` Anthony Liguori
2012-10-26 18:26 ` H. Peter Anvin
2012-10-29 6:23 ` Amit Shah
2012-10-30 4:32 ` H. Peter Anvin [this message]
2012-10-26 18:58 ` Paolo Bonzini
2012-10-26 19:07 ` H. Peter Anvin
2012-10-26 19:51 ` Paolo Bonzini
2012-10-26 19:54 ` H. Peter Anvin
2012-10-26 20:29 ` H. Peter Anvin
2012-10-29 8:45 ` Paolo Bonzini
2012-10-30 4:34 ` H. Peter Anvin
2012-10-30 4:43 ` H. Peter Anvin
2012-10-30 9:05 ` Paolo Bonzini
2012-10-30 21:11 ` H. Peter Anvin
2012-10-31 7:29 ` Paolo Bonzini
2012-10-31 14:15 ` H. Peter Anvin
2012-10-31 14:27 ` Paolo Bonzini
2012-10-26 18:53 ` Paolo Bonzini
2012-10-29 7:01 ` Amit Shah
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