linux-kernel - Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall

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]

Message-ID: <4F6FA972.9050103@zytor.com>
Date:	Sun, 25 Mar 2012 16:25:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC dontapply] kvm_para: add mmio word store hypercall

On 03/25/2012 03:05 PM, Michael S. Tsirkin wrote:
> We face a dilemma: IO mapped addresses are legacy,
> so, for example, PCI express bridges waste 4K
> of this space for each link, in effect limiting us
> to 16 devices using this space.

That is *only* if they are physical devices on PCIe links.  For virtual
devices you have no such limitation.  What is the problem again?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

--
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/