From: "Wu, Feng" <feng.wu@intel.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"Wu, Feng" <feng.wu@intel.com>,
"george.dunlap@eu.citrix.com" <george.dunlap@eu.citrix.com>,
"jbeulich@suse.com" <jbeulich@suse.com>,
"Zhang, Yang Z" <yang.z.zhang@intel.com>,
"keir@xen.org" <keir@xen.org>
Subject: Re: [v3 04/15] iommu: Add iommu_intpost to control VT-d Posted-Interrupts feature
Date: Thu, 25 Jun 2015 12:47:06 +0000 [thread overview]
Message-ID: <E959C4978C3B6342920538CF579893F0025CDF4E@SHSMSX104.ccr.corp.intel.com> (raw)
In-Reply-To: <558BD4E6.5040104@citrix.com>
> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
> Sent: Thursday, June 25, 2015 6:16 PM
> To: Wu, Feng; xen-devel@lists.xen.org
> Cc: Tian, Kevin; keir@xen.org; george.dunlap@eu.citrix.com;
> jbeulich@suse.com; Zhang, Yang Z
> Subject: Re: [Xen-devel] [v3 04/15] iommu: Add iommu_intpost to control VT-d
> Posted-Interrupts feature
>
> On 25/06/15 10:47, Wu, Feng wrote:
> >
> >> -----Original Message-----
> >> From: Andrew Cooper [mailto:andrew.cooper3@citrix.com]
> >> Sent: Thursday, June 25, 2015 5:06 PM
> >> To: Wu, Feng; xen-devel@lists.xen.org
> >> Cc: Tian, Kevin; keir@xen.org; george.dunlap@eu.citrix.com;
> >> jbeulich@suse.com; Zhang, Yang Z
> >> Subject: Re: [Xen-devel] [v3 04/15] iommu: Add iommu_intpost to control
> VT-d
> >> Posted-Interrupts feature
> >>
> >> On 24/06/15 06:18, Feng Wu wrote:
> >>> VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt.
> >>> With VT-d Posted-Interrupts enabled, external interrupts from
> >>> direct-assigned devices can be delivered to guests without VMM
> >>> intervention when guest is running in non-root mode.
> >>>
> >>> This patch adds variable 'iommu_intpost' to control whether enable VT-d
> >>> posted-interrupt or not in the generic IOMMU code.
> >>>
> >>> Signed-off-by: Feng Wu <feng.wu@intel.com>
> >>> ---
> >>> v3:
> >>> - Remove pointless initializer for 'iommu_intpost'.
> >>> - Some adjustment for "if no intremap then no intpost" logic.
> >>> * For parse_iommu_param(), move it to the end of the function,
> >>> so we don't need to add the some logic when introduing the
> >>> new kernel parameter 'intpost' in later patch.
> >>> * Add this logic in iommu_setup() after iommu_hardware_setup()
> >>> is called.
> >>>
> >>> xen/drivers/passthrough/iommu.c | 10 +++++++++-
> >>> xen/include/xen/iommu.h | 2 +-
> >>> 2 files changed, 10 insertions(+), 2 deletions(-)
> >>>
> >>> diff --git a/xen/drivers/passthrough/iommu.c
> >> b/xen/drivers/passthrough/iommu.c
> >>> index 06cb38f..597f676 100644
> >>> --- a/xen/drivers/passthrough/iommu.c
> >>> +++ b/xen/drivers/passthrough/iommu.c
> >>> @@ -39,6 +39,7 @@ static void iommu_dump_p2m_table(unsigned char
> >> key);
> >>> * no-snoop Disable VT-d Snoop Control
> >>> * no-qinval Disable VT-d Queued Invalidation
> >>> * no-intremap Disable VT-d Interrupt Remapping
> >>> + * no-intpost Disable VT-d Interrupt posting
> >>> */
> >>> custom_param("iommu", parse_iommu_param);
> >>> bool_t __initdata iommu_enable = 1;
> >>> @@ -51,6 +52,7 @@ bool_t __read_mostly iommu_passthrough;
> >>> bool_t __read_mostly iommu_snoop = 1;
> >>> bool_t __read_mostly iommu_qinval = 1;
> >>> bool_t __read_mostly iommu_intremap = 1;
> >>> +bool_t __read_mostly iommu_intpost;
> >>> bool_t __read_mostly iommu_hap_pt_share = 1;
> >>> bool_t __read_mostly iommu_debug;
> >>> bool_t __read_mostly amd_iommu_perdev_intremap = 1;
> >>> @@ -112,6 +114,9 @@ static void __init parse_iommu_param(char *s)
> >>>
> >>> s = ss + 1;
> >>> } while ( ss );
> >>> +
> >>> + if ( !iommu_intremap )
> >>> + iommu_intpost = 0;
> >> This check is redundant - It will unconditionally be performed by
> >> iommu_setup(). I would just drop the hunk.
> >>
> >> However, what you are missing is parsing logic to catch a command line
> >> configuration such as "iommu=intremap,no-intpost"
> > Doesn't the above code cover this command line?
>
> How would you expect it to? I do not see any strcmp( , "intpost") in
> this patch.
Oh, the command line handle logic is covered in [15/15].
Thanks,
Feng
>
> ~Andrew
next prev parent reply other threads:[~2015-06-25 12:47 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-24 5:18 [v3 00/15] Add VT-d Posted-Interrupts support Feng Wu
2015-06-24 5:18 ` [v3 01/15] Vt-d Posted-intterrupt (PI) design Feng Wu
2015-06-24 6:15 ` Meng Xu
2015-06-24 6:19 ` Wu, Feng
2015-07-08 7:21 ` Tian, Kevin
2015-07-08 7:29 ` Wu, Feng
2015-06-24 5:18 ` [v3 02/15] Add helper macro for X86_FEATURE_CX16 feature detection Feng Wu
2015-06-24 17:31 ` Andrew Cooper
2015-07-08 7:23 ` Tian, Kevin
2015-06-24 5:18 ` [v3 03/15] Add cmpxchg16b support for x86-64 Feng Wu
2015-06-24 18:35 ` Andrew Cooper
2015-07-08 7:06 ` Wu, Feng
2015-07-08 8:12 ` Jan Beulich
2015-07-08 8:33 ` Wu, Feng
2015-07-08 8:43 ` Jan Beulich
2015-07-08 8:50 ` Wu, Feng
2015-07-08 8:50 ` Andrew Cooper
2015-07-10 12:57 ` Jan Beulich
2015-06-24 5:18 ` [v3 04/15] iommu: Add iommu_intpost to control VT-d Posted-Interrupts feature Feng Wu
2015-06-25 9:06 ` Andrew Cooper
2015-06-25 9:47 ` Wu, Feng
2015-06-25 10:16 ` Andrew Cooper
2015-06-25 12:47 ` Wu, Feng [this message]
2015-07-08 7:30 ` Tian, Kevin
2015-06-24 5:18 ` [v3 05/15] vt-d: VT-d Posted-Interrupts feature detection Feng Wu
2015-06-25 10:21 ` Andrew Cooper
2015-06-25 13:02 ` Wu, Feng
2015-07-08 7:32 ` Tian, Kevin
2015-07-08 8:00 ` Wu, Feng
2015-06-24 5:18 ` [v3 06/15] vmx: Extend struct pi_desc to support VT-d Posted-Interrupts Feng Wu
2015-06-29 15:04 ` Andrew Cooper
2015-07-08 7:48 ` Tian, Kevin
2015-07-10 13:08 ` Jan Beulich
2015-07-15 2:40 ` Wu, Feng
2015-07-15 8:20 ` Jan Beulich
2015-07-15 8:26 ` Wu, Feng
2015-07-15 8:36 ` Jan Beulich
2015-07-15 8:43 ` Wu, Feng
2015-07-15 9:28 ` Jan Beulich
2015-07-15 9:30 ` Wu, Feng
2015-07-15 3:13 ` Wu, Feng
2015-06-24 5:18 ` [v3 07/15] vmx: Initialize VT-d Posted-Interrupts Descriptor Feng Wu
2015-06-29 15:32 ` Andrew Cooper
2015-06-30 1:46 ` Wu, Feng
2015-06-30 2:32 ` Dario Faggioli
2015-07-08 7:53 ` Tian, Kevin
2015-06-24 5:18 ` [v3 08/15] Suppress posting interrupts when 'SN' is set Feng Wu
2015-06-29 15:41 ` Andrew Cooper
2015-06-30 1:48 ` Wu, Feng
2015-07-08 9:06 ` Tian, Kevin
2015-07-08 10:11 ` Wu, Feng
2015-07-08 11:31 ` Tian, Kevin
2015-07-08 11:58 ` Wu, Feng
2015-07-10 13:20 ` Jan Beulich
2015-06-24 5:18 ` [v3 09/15] vt-d: Extend struct iremap_entry to support VT-d Posted-Interrupts Feng Wu
2015-06-29 16:04 ` Andrew Cooper
2015-06-30 1:52 ` Wu, Feng
2015-07-08 9:10 ` Tian, Kevin
2015-07-10 13:27 ` Jan Beulich
2015-06-24 5:18 ` [v3 10/15] vt-d: Add API to update IRTE when VT-d PI is used Feng Wu
2015-06-29 16:22 ` Andrew Cooper
2015-07-08 9:59 ` Tian, Kevin
2015-07-08 10:12 ` Wu, Feng
2015-07-10 14:01 ` Jan Beulich
2015-07-15 6:04 ` Wu, Feng
2015-07-15 8:24 ` Jan Beulich
2015-07-15 8:38 ` Wu, Feng
2015-07-15 8:46 ` Jan Beulich
2015-07-15 8:55 ` Wu, Feng
2015-07-15 9:32 ` Jan Beulich
2015-06-24 5:18 ` [v3 11/15] Update IRTE according to guest interrupt config changes Feng Wu
2015-06-29 16:46 ` Andrew Cooper
2015-07-08 10:22 ` Tian, Kevin
2015-07-08 10:31 ` Wu, Feng
2015-07-08 11:46 ` Tian, Kevin
2015-07-08 11:52 ` Wu, Feng
2015-07-08 11:54 ` Tian, Kevin
2015-07-10 14:23 ` Jan Beulich
2015-06-24 5:18 ` [v3 12/15] vmx: posted-interrupt handling when vCPU is blocked Feng Wu
2015-06-29 17:07 ` Andrew Cooper
2015-07-08 10:36 ` Wu, Feng
2015-07-08 10:48 ` Jan Beulich
[not found] ` <559181F9.6020106@citrix.com>
2015-06-30 2:51 ` Fwd: " Dario Faggioli
2015-06-30 2:59 ` Wu, Feng
2015-06-30 9:46 ` Dario Faggioli
2015-06-30 10:11 ` Andrew Cooper
2015-07-01 13:26 ` Dario Faggioli
2015-07-02 4:27 ` Wu, Feng
2015-07-02 8:30 ` Dario Faggioli
2015-07-02 8:58 ` Wu, Feng
2015-07-02 10:09 ` Dario Faggioli
2015-07-02 10:41 ` Wu, Feng
2015-07-02 10:30 ` Andrew Cooper
2015-07-02 10:56 ` Wu, Feng
2015-07-02 12:04 ` Dario Faggioli
2015-07-02 12:10 ` Wu, Feng
2015-07-02 12:16 ` Andrew Cooper
2015-07-02 12:38 ` Dario Faggioli
2015-07-02 12:59 ` Andrew Cooper
2015-07-03 1:33 ` Wu, Feng
2015-07-02 4:25 ` Wu, Feng
2015-07-08 11:00 ` Tian, Kevin
2015-07-08 11:02 ` Wu, Feng
2015-07-08 12:46 ` Jan Beulich
2015-07-08 13:09 ` Andrew Cooper
2015-07-08 22:49 ` Tian, Kevin
2015-07-09 7:25 ` Jan Beulich
2015-07-10 6:21 ` Wu, Feng
2015-07-10 6:32 ` Jan Beulich
2015-07-10 7:29 ` Wu, Feng
2015-07-10 8:49 ` Jan Beulich
2015-07-10 8:57 ` Wu, Feng
2015-07-08 22:31 ` Tian, Kevin
2015-06-24 5:18 ` [v3 13/15] vmx: Properly handle notification event when vCPU is running Feng Wu
2015-07-08 11:03 ` Tian, Kevin
2015-07-10 14:40 ` Jan Beulich
2015-06-24 5:18 ` [v3 14/15] Update Posted-Interrupts Descriptor during vCPU scheduling Feng Wu
[not found] ` <55918214.4030102@citrix.com>
2015-06-30 2:58 ` Fwd: " Dario Faggioli
2015-07-02 4:32 ` Wu, Feng
2015-07-02 4:34 ` Wu, Feng
2015-07-02 8:20 ` Dario Faggioli
2015-07-09 3:09 ` Wu, Feng
2015-07-09 8:18 ` Dario Faggioli
2015-07-09 11:19 ` George Dunlap
2015-07-09 11:29 ` George Dunlap
2015-07-09 11:38 ` Wu, Feng
2015-07-09 12:42 ` Dario Faggioli
2015-07-10 0:07 ` Wu, Feng
2015-07-10 12:40 ` Dario Faggioli
2015-07-10 13:47 ` Konrad Rzeszutek Wilk
2015-07-10 13:59 ` Dario Faggioli
2015-07-09 12:53 ` George Dunlap
2015-07-09 13:44 ` Jan Beulich
2015-07-09 14:18 ` Dario Faggioli
2015-07-09 14:27 ` George Dunlap
2015-07-09 14:47 ` Dario Faggioli
2015-07-10 5:59 ` Wu, Feng
2015-07-10 6:22 ` Jan Beulich
2015-07-10 11:05 ` Dario Faggioli
2015-07-14 5:44 ` Wu, Feng
2015-07-14 14:08 ` Wu, Feng
2015-07-14 14:54 ` Jan Beulich
2015-07-14 15:20 ` Dario Faggioli
2015-07-14 16:41 ` George Dunlap
2015-07-14 16:02 ` Dario Faggioli
2015-07-15 0:54 ` Wu, Feng
2015-07-17 7:46 ` Wu, Feng
2015-07-17 10:13 ` Dario Faggioli
2015-07-17 22:57 ` Wu, Feng
2015-07-18 13:43 ` Dario Faggioli
2015-07-10 0:15 ` Wu, Feng
2015-07-08 11:24 ` Tian, Kevin
2015-07-10 14:48 ` Jan Beulich
2015-06-24 5:18 ` [v3 15/15] Add a command line parameter for VT-d posted-interrupts Feng Wu
2015-07-08 11:25 ` Tian, Kevin
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