linux-kernel - Re: [RFC PATCH 1/3] add generic hypercall support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 05 May 2009 12:03:07 -0500
From:	Hollis Blanchard <hollisb@...ibm.com>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, avi@...hat.com
Subject: Re: [RFC PATCH 1/3] add generic hypercall support

On Tue, 2009-05-05 at 09:24 -0400, Gregory Haskins wrote:
> 
> *) PIO is more direct than MMIO, but it poses other problems such as:
>       a) can have a small limited address space (x86 is 2^16)
>       b) is a narrow-band interface (one 8, 16, 32, 64 bit word at a time)
>       c) not available on all archs (PCI mentions ppc as problematic) and
>          is therefore recommended to avoid.

Side note: I don't know what PCI has to do with this, and "problematic"
isn't the word I would use. ;) As far as I know, x86 is the only
still-alive architecture that implements instructions for a separate IO
space (not even ia64 does).

-- 
Hollis Blanchard
IBM Linux Technology Center

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/