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From: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
To: Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	Paul Brook <paul-qD8j1LwMmJjtCj0u4l0SBw@public.gmane.org>,
	qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org,
	Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
	Fabrice Bellard <fabrice-+Yn2HnRVxb5AfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH 2/6] Use correct types to enable > 2G support (v2)
Date: Mon, 04 Feb 2008 09:31:37 -0600	[thread overview]
Message-ID: <47A72FD9.90606@codemonkey.ws> (raw)
In-Reply-To: <1202114748.30861.6.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>

Izik Eidus wrote:
>> Do you recall what this change fixed?  As Paul pointed out in IRC, using 
>> the host type here doesn't really fix the problem (target_ulong would be 
>> more appropriate).  However, we're both curious what problem it's 
>> actually fixing since sign extending the int should just work.
>>     
>
> ok the commit say:
>
>    kvm: qemu: change the type of the various page masks to unsigned long
>     
>    prevents truncation with >=4GB of guest physical memory
>
>
> as far as i remember it was used to address something with
> cpu_physical_memory_rw() probably related to &TARGET_PAGE_SIZE
> or ~TARGET_PAGE_SIZE,
>
> the fact is that i dont know if it ever fixed anything
>   

Thanks, that was my suspicion too.

Regards,

Anthony Liguori


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WARNING: multiple messages have this Message-ID (diff)
From: Anthony Liguori <anthony@codemonkey.ws>
To: Izik Eidus <izike@qumranet.com>
Cc: kvm-devel@lists.sourceforge.net,
	Paul Brook <paul@codesourcery.com>,
	qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: [PATCH 2/6] Use correct types to enable > 2G support (v2)
Date: Mon, 04 Feb 2008 09:31:37 -0600	[thread overview]
Message-ID: <47A72FD9.90606@codemonkey.ws> (raw)
In-Reply-To: <1202114748.30861.6.camel@localhost.localdomain>

Izik Eidus wrote:
>> Do you recall what this change fixed?  As Paul pointed out in IRC, using 
>> the host type here doesn't really fix the problem (target_ulong would be 
>> more appropriate).  However, we're both curious what problem it's 
>> actually fixing since sign extending the int should just work.
>>     
>
> ok the commit say:
>
>    kvm: qemu: change the type of the various page masks to unsigned long
>     
>    prevents truncation with >=4GB of guest physical memory
>
>
> as far as i remember it was used to address something with
> cpu_physical_memory_rw() probably related to &TARGET_PAGE_SIZE
> or ~TARGET_PAGE_SIZE,
>
> the fact is that i dont know if it ever fixed anything
>   

Thanks, that was my suspicion too.

Regards,

Anthony Liguori

  parent reply	other threads:[~2008-02-04 15:31 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-01 22:11 [PATCH 0/6] Support for the Kernel Virtual Machine interface (v2) Anthony Liguori
2008-02-01 22:11 ` [Qemu-devel] " Anthony Liguori
     [not found] ` <1201903921-1125-1-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-02-01 22:11   ` [PATCH 1/6] Fix VMware VGA init call Anthony Liguori
2008-02-01 22:11     ` [Qemu-devel] " Anthony Liguori
     [not found]     ` <1201903921-1125-2-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-02-01 22:23       ` Anthony Liguori
2008-02-01 22:23         ` [Qemu-devel] " Anthony Liguori
2008-02-01 22:11   ` [PATCH 2/6] Use correct types to enable > 2G support (v2) Anthony Liguori
2008-02-01 22:11     ` [Qemu-devel] " Anthony Liguori
     [not found]     ` <1201903921-1125-3-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-02-04  1:56       ` Anthony Liguori
2008-02-04  1:56         ` [Qemu-devel] " Anthony Liguori
     [not found]         ` <47A670B4.6020803-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-02-04  8:45           ` Izik Eidus
2008-02-04  8:45             ` [Qemu-devel] " Izik Eidus
     [not found]             ` <1202114748.30861.6.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-02-04 15:31               ` Anthony Liguori [this message]
2008-02-04 15:31                 ` Anthony Liguori
2008-02-10 10:48             ` Avi Kivity
2008-02-10 10:48               ` [Qemu-devel] " Avi Kivity
2008-02-10 14:12               ` Paul Brook
2008-02-10 14:12                 ` Paul Brook
2008-02-10 14:55                 ` Avi Kivity
2008-02-10 14:55                   ` Avi Kivity
2008-02-10 14:59                   ` Paul Brook
2008-02-10 14:59                     ` Paul Brook
2008-02-10 15:14                     ` Avi Kivity
2008-02-10 15:14                       ` Avi Kivity
2008-02-01 22:11   ` [PATCH 3/6] SCI fixes (v2) Anthony Liguori
2008-02-01 22:11     ` [Qemu-devel] " Anthony Liguori
2008-02-01 22:12   ` [PATCH 5/6] Tell BIOS about the number of CPUs (v2) Anthony Liguori
2008-02-01 22:12     ` [Qemu-devel] " Anthony Liguori
2008-02-01 22:12   ` [PATCH 6/6] QEMU support for the Kernel Virtual Machine interface (v2) Anthony Liguori
2008-02-01 22:12     ` [Qemu-devel] " Anthony Liguori
     [not found]     ` <1201903921-1125-7-git-send-email-aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-02-04 13:51       ` Soren Hansen
2008-02-04 13:51         ` Soren Hansen
     [not found]         ` <20080204135149.GD4554-w/BXfMF2+jKSwEwcaNC2fFpr/1R2p/CL@public.gmane.org>
2008-02-04 15:14           ` Anthony Liguori
2008-02-04 15:14             ` [kvm-devel] " Anthony Liguori
2008-02-01 22:11 ` [PATCH 4/6] Fix daemonize options (v2) Anthony Liguori
2008-02-01 22:11   ` [Qemu-devel] " Anthony Liguori

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