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From: Paolo Bonzini <pbonzini@redhat.com>
To: Don Slutz <dslutz@verizon.com>,
	xen-devel@lists.xensource.com, qemu-devel@nongnu.org,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Anthony Liguori <aliguori@amazon.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH v3 3/4] pc & q35: Add new object pc-memory-layout.
Date: Mon, 21 Apr 2014 08:27:44 -0400	[thread overview]
Message-ID: <53550EC0.7070207@redhat.com> (raw)
In-Reply-To: <1395705336-22528-4-git-send-email-dslutz@verizon.com>

Il 24/03/2014 19:55, Don Slutz ha scritto:
> This new object has the property max-ram-below-4g.
>
> If you add enough PCI devices then all mmio for them will not fit
> below 4G which may not be the layout the user wanted. This allows
> you to increase the below 4G address space that PCI devices can use
> (aka decrease ram below 4G) and therefore in more cases not have any
> mmio that is above 4G.
>
> For example adding "-global pc-memory-layout.max-ram-below-4g=2G" to
> the command line will limit the amount of ram that is below 4G to
> 2G.

Does Xen's firmware allow 64-bit BARs?  I'm wondering why this is not a 
problem on KVM.

Also, overloading -global like this isn't the best long term choice.  We 
should get custom -machine properties in 2.1, we should use them.

Paolo

  parent reply	other threads:[~2014-04-21 12:27 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-24 23:55 [PATCH v3 0/4] Add max-ram-below-4g (was Add pci_hole_min_size machine option) Don Slutz
2014-03-24 23:55 ` [PATCH v3 1/4] xen-all: Fix xen_hvm_init() to adjust pc memory layout Don Slutz
2014-04-18 14:23   ` Andreas Färber
2014-04-22 16:29     ` Don Slutz
2014-03-24 23:55 ` [PATCH v3 2/4] GlobalProperty: Display warning about unused -global Don Slutz
2014-04-18 15:21   ` Andreas Färber
2014-04-18 15:36     ` [Xen-devel] " Fabio Fantoni
2014-04-18 15:59       ` Andreas Färber
2014-04-18 16:54         ` Fabio Fantoni
2014-04-19 10:56           ` Fabio Fantoni
2014-04-22 18:44             ` Don Slutz
2014-04-19 20:54     ` Paolo Bonzini
2014-04-22 23:13       ` Don Slutz
2014-04-23  0:28         ` Paolo Bonzini
2014-04-23 12:58           ` Don Slutz
2014-04-23 13:33         ` Andreas Färber
2014-04-22 20:23     ` Don Slutz
2014-04-23  0:28       ` Paolo Bonzini
2014-04-23 13:25         ` Don Slutz
2014-03-24 23:55 ` [PATCH v3 3/4] pc & q35: Add new object pc-memory-layout Don Slutz
2014-04-18 15:45   ` Andreas Färber
2014-04-22 23:54     ` Don Slutz
2014-04-21 12:27   ` Paolo Bonzini [this message]
2014-04-23  0:13     ` Don Slutz
2014-04-23  3:27       ` Paolo Bonzini
2014-04-23  6:51       ` Marcel Apfelbaum
2014-03-24 23:55 ` [PATCH v3 4/4] xen-all: Pass max_ram_below_4g to xen_hvm_init Don Slutz
2014-03-25 11:17   ` Stefano Stabellini
2014-04-18 16:19   ` Andreas Färber
2014-04-22 18:27     ` Don Slutz
2014-03-25  9:08 ` [PATCH v3 0/4] Add max-ram-below-4g (was Add pci_hole_min_size machine option) Michael S. Tsirkin
2014-04-17 18:27   ` PING " Don Slutz
2014-04-18 14:10   ` Andreas Färber
2014-04-22 16:31     ` Don Slutz
2014-05-05  8:12       ` [Qemu-devel] " Michael S. Tsirkin
2014-05-05 16:16         ` Don Slutz

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