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From: "Jan Beulich" <JBeulich@suse.com>
To: David Vrabel <david.vrabel@citrix.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Juergen Gross <JGross@suse.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] xen-pciback: return proper values during BAR sizing
Date: Tue, 07 Jun 2016 08:14:04 -0600	[thread overview]
Message-ID: <5756F2CC02000078000F2A64__33257.1763814942$1465308911$gmane$org@prv-mh.provo.novell.com> (raw)
In-Reply-To: <5756D4F4.7070802@oracle.com>

>>> On 07.06.16 at 16:06, <boris.ostrovsky@oracle.com> wrote:
> On 06/07/2016 02:30 AM, Jan Beulich wrote:
>> Reads following writes with all address bits set to 1 should return all
>> changeable address bits as one, not the BAR size (nor, as was the case
>> for the upper half of 64-bit BARs, the high half of the region's end
>> address). Presumably this didn't cause any problems so far because
>> consumers use the value to calculate the size (usually via val & -val),
>> and do nothing else with it.
>> But also consider the exception here: Unimplemented BARs should always
>> return all zeroes.
>> And finally, the check for whether to return the sizing address on read
>> for the ROM BAR should ignore all non-address bits, not just the ROM
>> Enable one.
> Should this go to stable trees as well?

Not sure - we had no active reports of problems. The context this
was found in did not really have an issue because it was broken.
I guess I'll leave this to you maintainers...


Xen-devel mailing list

  parent reply	other threads:[~2016-06-07 14:14 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <5756857802000078000F268D@prv-mh.provo.novell.com>
2016-06-07  6:30 ` [PATCH v2 1/2] xen-pciback: return proper values during BAR sizing Jan Beulich
2016-06-07  6:31 ` [PATCH v2 2/2] xen-pciback: clean up {bar,rom}_init() Jan Beulich
     [not found] ` <5756864102000078000F269A@prv-mh.provo.novell.com>
2016-06-07 14:06   ` [PATCH v2 1/2] xen-pciback: return proper values during BAR sizing Boris Ostrovsky
     [not found]   ` <5756D4F4.7070802@oracle.com>
2016-06-07 14:14     ` Jan Beulich [this message]
2016-06-24  9:13   ` [PATCH v3 " Jan Beulich
     [not found]   ` <576D15DE02000078000F8678@prv-mh.provo.novell.com>
2016-06-24 14:08     ` David Vrabel
     [not found] ` <5756866F02000078000F269D@prv-mh.provo.novell.com>
2016-06-07 14:06   ` [PATCH v2 2/2] xen-pciback: clean up {bar, rom}_init() Boris Ostrovsky
2016-06-24 15:01   ` David Vrabel
     [not found]   ` <576D4B59.9070906@citrix.com>
2016-06-27  7:24     ` Jan Beulich
     [not found]     ` <5770F0CF02000078000F8DD3@prv-mh.provo.novell.com>
2016-06-29 12:42       ` David Vrabel

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