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From: David Vrabel <david.vrabel@citrix.com>
To: Mukesh Rathor <mukesh.rathor@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	<linux-kernel@vger.kernel.org>, <xen-devel@lists.xenproject.org>,
	<boris.ostrovsky@oracle.com>, <stefano.stabellini@eu.citrix.com>
Subject: Re: [PATCH v12 06/18] xen/pvh: MMU changes for PVH (v2)
Date: Fri, 3 Jan 2014 10:14:11 +0000	[thread overview]
Message-ID: <52C68D73.70005@citrix.com> (raw)
In-Reply-To: <20140102173639.3869d841@mantra.us.oracle.com>

On 03/01/14 01:36, Mukesh Rathor wrote:
> On Thu, 2 Jan 2014 11:24:50 +0000
> David Vrabel <david.vrabel@citrix.com> wrote:
> 
>> On 01/01/14 04:35, Konrad Rzeszutek Wilk wrote:
>>> From: Mukesh Rathor <mukesh.rathor@oracle.com>
>>>
>>> .. which are surprinsingly small compared to the amount for PV code.
>>>
>>> PVH uses mostly native mmu ops, we leave the generic (native_*) for
>>> the majority and just overwrite the baremetal with the ones we need.
>>>
>>> We also optimize one - the TLB flush. The native operation would
>>> needlessly IPI offline VCPUs causing extra wakeups. Using the
>>> Xen one avoids that and lets the hypervisor determine which
>>> VCPU needs the TLB flush.
>>
>> This TLB flush optimization should be a separate patch.
> 
> It's not really an "optimization", we are using PV mechanism instead
> of native because PV one performs better.

Um.  Isn't that the very definition of an optimization?

I do think it is better for the essential MMU changes to be clearly
separate from the optional ones.

David


  reply	other threads:[~2014-01-03 10:14 UTC|newest]

Thread overview: 169+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-01  4:35 [PATCH v12] Linux Xen PVH support Konrad Rzeszutek Wilk
2014-01-01  4:35 ` [PATCH v12 01/18] xen/p2m: Check for auto-xlat when doing mfn_to_local_pfn Konrad Rzeszutek Wilk
2014-01-01  4:35 ` [PATCH v12 02/18] xen/pvh/x86: Define what an PVH guest is (v2) Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:13   ` David Vrabel
2014-01-02 11:13   ` David Vrabel
2014-01-03 15:33     ` Stefano Stabellini
2014-01-03 15:33     ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 03/18] xen/pvh: Early bootup changes in PV code (v2) Konrad Rzeszutek Wilk
2014-01-02 15:32   ` David Vrabel
2014-01-02 18:32     ` Konrad Rzeszutek Wilk
2014-01-03  1:34       ` Mukesh Rathor
2014-01-03 11:29         ` David Vrabel
2014-01-03 15:37           ` Stefano Stabellini
2014-01-03 15:37           ` Stefano Stabellini
2014-01-03 11:29         ` David Vrabel
2014-01-03 17:35         ` Konrad Rzeszutek Wilk
2014-01-03 17:35         ` Konrad Rzeszutek Wilk
2014-01-04  1:13           ` Mukesh Rathor
2014-01-04  1:13           ` Mukesh Rathor
2014-01-03  1:34       ` Mukesh Rathor
2014-01-03 11:25       ` David Vrabel
2014-01-03 11:25       ` David Vrabel
2014-01-02 18:32     ` Konrad Rzeszutek Wilk
2014-01-02 15:32   ` David Vrabel
2014-01-01  4:35 ` [PATCH v12 04/18] xen/pvh: Don't setup P2M tree Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:17   ` David Vrabel
2014-01-02 11:17   ` David Vrabel
2014-01-03 15:41   ` Stefano Stabellini
2014-01-03 15:41   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 05/18] xen/mmu/p2m: Refactor the xen_pagetable_init code Konrad Rzeszutek Wilk
2014-01-02 11:21   ` David Vrabel
2014-01-02 11:21   ` David Vrabel
2014-01-03 15:47   ` Stefano Stabellini
2014-01-03 16:02     ` Konrad Rzeszutek Wilk
2014-01-03 16:23       ` Stefano Stabellini
2014-01-03 16:23       ` Stefano Stabellini
2014-01-03 16:02     ` Konrad Rzeszutek Wilk
2014-01-03 15:47   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 06/18] xen/pvh: MMU changes for PVH (v2) Konrad Rzeszutek Wilk
2014-01-02 11:24   ` David Vrabel
2014-01-02 11:24   ` David Vrabel
2014-01-03  1:36     ` Mukesh Rathor
2014-01-03  1:36     ` Mukesh Rathor
2014-01-03 10:14       ` David Vrabel [this message]
2014-01-03 10:14       ` David Vrabel
2014-01-03 15:50     ` Stefano Stabellini
2014-01-03 15:50     ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 07/18] xen/pvh: Setup up shared_info Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:27   ` David Vrabel
2014-01-02 11:27   ` David Vrabel
2014-01-02 18:23     ` Konrad Rzeszutek Wilk
2014-01-02 18:23     ` Konrad Rzeszutek Wilk
2014-01-03 14:39     ` Konrad Rzeszutek Wilk
2014-01-03 14:39     ` Konrad Rzeszutek Wilk
2014-01-03 15:18       ` David Vrabel
2014-01-03 15:18       ` David Vrabel
2014-01-01  4:35 ` [PATCH v12 08/18] xen/pvh: Load GDT/GS in early PV bootup code for BSP Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:31   ` David Vrabel
2014-01-02 11:31   ` David Vrabel
2014-01-02 18:24     ` Konrad Rzeszutek Wilk
2014-01-03 11:27       ` David Vrabel
2014-01-03 11:27       ` David Vrabel
2014-01-02 18:24     ` Konrad Rzeszutek Wilk
2014-01-01  4:35 ` [PATCH v12 09/18] xen/pvh: Secondary VCPU bringup (non-bootup CPUs) Konrad Rzeszutek Wilk
2014-01-02 16:07   ` David Vrabel
2014-01-02 16:07   ` David Vrabel
2014-01-01  4:35 ` [PATCH v12 10/18] xen/pvh: Update E820 to work with PVH (v2) Konrad Rzeszutek Wilk
2014-01-02 16:14   ` David Vrabel
2014-01-02 18:41     ` Konrad Rzeszutek Wilk
2014-01-02 18:41     ` Konrad Rzeszutek Wilk
2014-01-04  1:23       ` Mukesh Rathor
2014-01-04  1:23       ` Mukesh Rathor
2014-01-04  2:25         ` Konrad Rzeszutek Wilk
2014-01-04  2:25         ` Konrad Rzeszutek Wilk
2014-01-02 16:14   ` David Vrabel
2014-01-03 16:30   ` Stefano Stabellini
2014-01-03 16:30   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 11/18] xen/pvh: Piggyback on PVHVM for event channels (v2) Konrad Rzeszutek Wilk
2014-01-02 15:43   ` David Vrabel
2014-01-02 15:43   ` David Vrabel
2014-01-03 16:34   ` Stefano Stabellini
2014-01-03 16:34   ` Stefano Stabellini
2014-01-03 18:10     ` Konrad Rzeszutek Wilk
2014-01-03 18:10     ` Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-01  4:35 ` [PATCH v12 12/18] xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:38   ` David Vrabel
2014-01-02 11:38   ` David Vrabel
2014-01-03 16:40   ` Stefano Stabellini
2014-01-03 16:40   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 13/18] xen/grant-table: Refactor gnttab_init Konrad Rzeszutek Wilk
2014-01-02 11:39   ` David Vrabel
2014-01-02 11:39   ` David Vrabel
2014-01-03 16:43   ` Stefano Stabellini
2014-01-03 16:43   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 14/18] xen/grant: Implement an grant frame array struct Konrad Rzeszutek Wilk
2014-01-02 16:27   ` David Vrabel
2014-01-02 16:27   ` David Vrabel
2014-01-02 18:47     ` Konrad Rzeszutek Wilk
2014-01-03 12:11       ` David Vrabel
2014-01-03 12:11       ` [Xen-devel] " David Vrabel
2014-01-03 15:09         ` Konrad Rzeszutek Wilk
2014-01-03 15:09         ` Konrad Rzeszutek Wilk
2014-01-02 18:47     ` Konrad Rzeszutek Wilk
2014-01-03 16:53   ` Stefano Stabellini
2014-01-03 19:18     ` [Xen-devel] " Konrad Rzeszutek Wilk
2014-01-03 19:18     ` Konrad Rzeszutek Wilk
2014-01-03 16:53   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 15/18] xen/pvh: Piggyback on PVHVM for grant driver (v2) Konrad Rzeszutek Wilk
2014-01-02 16:32   ` David Vrabel
2014-01-02 18:50     ` Konrad Rzeszutek Wilk
2014-01-02 18:50     ` Konrad Rzeszutek Wilk
2014-01-03 11:54       ` David Vrabel
2014-01-03 11:54       ` David Vrabel
2014-01-03 14:44         ` Konrad Rzeszutek Wilk
2014-01-03 15:41           ` David Vrabel
2014-01-03 15:41           ` David Vrabel
2014-01-03 15:48             ` [Xen-devel] " Konrad Rzeszutek Wilk
2014-01-03 15:48               ` Konrad Rzeszutek Wilk
2014-01-03 17:20               ` [Xen-devel] " Stefano Stabellini
2014-01-03 18:14                 ` Konrad Rzeszutek Wilk
2014-01-03 18:29                   ` Stefano Stabellini
2014-01-03 18:29                   ` [Xen-devel] " Stefano Stabellini
2014-01-03 18:39                     ` Konrad Rzeszutek Wilk
2014-01-03 19:02                       ` Stefano Stabellini
2014-01-03 19:02                       ` [Xen-devel] " Stefano Stabellini
2014-01-03 18:39                     ` Konrad Rzeszutek Wilk
2014-01-03 18:14                 ` Konrad Rzeszutek Wilk
2014-01-03 17:20               ` Stefano Stabellini
2014-01-03 14:44         ` Konrad Rzeszutek Wilk
2014-01-02 16:32   ` David Vrabel
2014-01-03 17:26   ` Stefano Stabellini
2014-01-03 17:26   ` Stefano Stabellini
2014-01-03 18:20     ` Konrad Rzeszutek Wilk
2014-01-03 18:20     ` Konrad Rzeszutek Wilk
2014-01-01  4:35 ` [PATCH v12 16/18] xen/pvh: Piggyback on PVHVM XenBus Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:43   ` David Vrabel
2014-01-02 11:43   ` David Vrabel
2014-01-03 17:22   ` Stefano Stabellini
2014-01-03 17:22   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 17/18] xen/pvh/arm/arm64: Disable PV code that does not work with PVH (v2) Konrad Rzeszutek Wilk
2014-01-02 11:44   ` David Vrabel
2014-01-02 11:44   ` David Vrabel
2014-01-03 16:22   ` Stefano Stabellini
2014-01-03 17:59     ` Konrad Rzeszutek Wilk
2014-01-03 17:59     ` Konrad Rzeszutek Wilk
2014-01-03 16:22   ` Stefano Stabellini
2014-01-01  4:35 ` [PATCH v12 18/18] xen/pvh: Support ParaVirtualized Hardware extensions (v2) Konrad Rzeszutek Wilk
2014-01-01  4:35 ` Konrad Rzeszutek Wilk
2014-01-02 11:48   ` David Vrabel
2014-01-02 18:27     ` Konrad Rzeszutek Wilk
2014-01-02 18:27     ` Konrad Rzeszutek Wilk
2014-01-02 11:48   ` David Vrabel
2014-01-02 16:50 ` [PATCH v12] Linux Xen PVH support David Vrabel
2014-01-02 19:02   ` Konrad Rzeszutek Wilk
2014-01-03 13:37     ` David Vrabel
2014-01-03 13:37     ` David Vrabel
2014-01-02 19:02   ` Konrad Rzeszutek Wilk
2014-01-02 16:50 ` David Vrabel
2014-01-02 18:39 ` H. Peter Anvin
2014-01-02 18:39 ` H. Peter Anvin
2014-01-02 19:12   ` Konrad Rzeszutek Wilk
2014-01-02 19:12   ` Konrad Rzeszutek Wilk

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