From: Dave Hansen <dave.hansen@intel.com>
To: Qiaowei Ren <qiaowei.ren@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Cc: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 04/10] x86, mpx: hook #BR exception handler to allocate bound tables
Date: Fri, 12 Sep 2014 15:58:01 -0700 [thread overview]
Message-ID: <54137A79.6060602@intel.com> (raw)
In-Reply-To: <1410425210-24789-5-git-send-email-qiaowei.ren@intel.com>
On 09/11/2014 01:46 AM, Qiaowei Ren wrote:
> +static int allocate_bt(long __user *bd_entry)
> +{
> + unsigned long bt_addr, old_val = 0;
> + int ret = 0;
> +
> + bt_addr = mpx_mmap(MPX_BT_SIZE_BYTES);
> + if (IS_ERR((void *)bt_addr))
> + return bt_addr;
> + bt_addr = (bt_addr & MPX_BT_ADDR_MASK) | MPX_BD_ENTRY_VALID_FLAG;
Qiaowei, why do we need the "& MPX_BT_ADDR_MASK" here?
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Qiaowei Ren <qiaowei.ren@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>
Cc: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 04/10] x86, mpx: hook #BR exception handler to allocate bound tables
Date: Fri, 12 Sep 2014 15:58:01 -0700 [thread overview]
Message-ID: <54137A79.6060602@intel.com> (raw)
In-Reply-To: <1410425210-24789-5-git-send-email-qiaowei.ren@intel.com>
On 09/11/2014 01:46 AM, Qiaowei Ren wrote:
> +static int allocate_bt(long __user *bd_entry)
> +{
> + unsigned long bt_addr, old_val = 0;
> + int ret = 0;
> +
> + bt_addr = mpx_mmap(MPX_BT_SIZE_BYTES);
> + if (IS_ERR((void *)bt_addr))
> + return bt_addr;
> + bt_addr = (bt_addr & MPX_BT_ADDR_MASK) | MPX_BD_ENTRY_VALID_FLAG;
Qiaowei, why do we need the "& MPX_BT_ADDR_MASK" here?
next prev parent reply other threads:[~2014-09-12 22:58 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 8:46 [PATCH v8 00/10] Intel MPX support Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 8:46 ` [PATCH v8 01/10] x86, mpx: introduce VM_MPX to indicate that a VMA is MPX specific Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 8:46 ` [PATCH v8 02/10] x86, mpx: add MPX specific mmap interface Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 8:46 ` [PATCH v8 03/10] x86, mpx: add macro cpu_has_mpx Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 8:46 ` [PATCH v8 04/10] x86, mpx: hook #BR exception handler to allocate bound tables Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-12 22:58 ` Dave Hansen [this message]
2014-09-12 22:58 ` Dave Hansen
2014-09-13 7:24 ` Ren, Qiaowei
2014-09-13 7:24 ` Ren, Qiaowei
2014-09-24 14:40 ` Dave Hansen
2014-09-24 14:40 ` Dave Hansen
2014-09-11 8:46 ` [PATCH v8 05/10] x86, mpx: extend siginfo structure to include bound violation information Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 8:46 ` [PATCH v8 06/10] mips: sync struct siginfo with general version Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 22:13 ` Thomas Gleixner
2014-09-11 22:13 ` Thomas Gleixner
2014-09-12 2:54 ` Ren, Qiaowei
2014-09-12 2:54 ` Ren, Qiaowei
2014-09-12 8:17 ` Thomas Gleixner
2014-09-12 8:17 ` Thomas Gleixner
2014-09-13 7:13 ` Ren, Qiaowei
2014-09-13 7:13 ` Ren, Qiaowei
2014-09-11 8:46 ` [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound violation information Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 22:18 ` Thomas Gleixner
2014-09-11 22:18 ` Thomas Gleixner
2014-09-11 22:32 ` Dave Hansen
2014-09-11 22:32 ` Dave Hansen
2014-09-11 22:35 ` H. Peter Anvin
2014-09-11 22:35 ` H. Peter Anvin
2014-09-11 23:37 ` Thomas Gleixner
2014-09-11 23:37 ` Thomas Gleixner
2014-09-12 4:44 ` H. Peter Anvin
2014-09-12 4:44 ` H. Peter Anvin
2014-09-12 13:10 ` Thomas Gleixner
2014-09-12 13:10 ` Thomas Gleixner
2014-09-12 13:39 ` H. Peter Anvin
2014-09-12 13:39 ` H. Peter Anvin
2014-09-12 17:48 ` Thomas Gleixner
2014-09-12 17:48 ` Thomas Gleixner
2014-09-12 17:52 ` Thomas Gleixner
2014-09-12 17:52 ` Thomas Gleixner
2014-09-12 19:07 ` H. Peter Anvin
2014-09-12 19:07 ` H. Peter Anvin
2014-09-11 8:46 ` [PATCH v8 08/10] x86, mpx: add prctl commands PR_MPX_REGISTER, PR_MPX_UNREGISTER Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 15:03 ` Dave Hansen
2014-09-11 15:03 ` Dave Hansen
2014-09-12 3:10 ` Ren, Qiaowei
2014-09-12 3:10 ` Ren, Qiaowei
2014-09-11 23:28 ` Thomas Gleixner
2014-09-11 23:28 ` Thomas Gleixner
2014-09-12 0:10 ` Dave Hansen
2014-09-12 0:10 ` Dave Hansen
2014-09-12 8:11 ` Thomas Gleixner
2014-09-12 8:11 ` Thomas Gleixner
2014-09-12 9:24 ` Thomas Gleixner
2014-09-12 9:24 ` Thomas Gleixner
2014-09-12 14:36 ` Dave Hansen
2014-09-12 14:36 ` Dave Hansen
2014-09-12 17:34 ` Thomas Gleixner
2014-09-12 17:34 ` Thomas Gleixner
2014-09-12 18:42 ` Thomas Gleixner
2014-09-12 18:42 ` Thomas Gleixner
2014-09-12 20:35 ` Dave Hansen
2014-09-12 20:35 ` Dave Hansen
2014-09-12 20:18 ` Dave Hansen
2014-09-12 20:18 ` Dave Hansen
2014-09-13 9:01 ` Thomas Gleixner
2014-09-13 9:01 ` Thomas Gleixner
2014-09-12 15:22 ` Dave Hansen
2014-09-12 15:22 ` Dave Hansen
2014-09-12 17:42 ` Thomas Gleixner
2014-09-12 17:42 ` Thomas Gleixner
2014-09-12 20:33 ` Dave Hansen
2014-09-12 20:33 ` Dave Hansen
2014-09-15 0:00 ` One Thousand Gnomes
2014-09-15 0:00 ` One Thousand Gnomes
2014-09-16 3:20 ` Ren, Qiaowei
2014-09-16 3:20 ` Ren, Qiaowei
2014-09-16 4:17 ` Dave Hansen
2014-09-16 4:17 ` Dave Hansen
2014-09-16 7:50 ` Kevin Easton
2014-09-16 7:50 ` Kevin Easton
2014-09-18 0:40 ` Ren, Qiaowei
2014-09-18 0:40 ` Ren, Qiaowei
2014-09-18 3:23 ` Kevin Easton
2014-09-18 3:23 ` Kevin Easton
2014-09-18 2:37 ` Ren, Qiaowei
2014-09-18 2:37 ` Ren, Qiaowei
2014-09-18 4:43 ` Dave Hansen
2014-09-18 4:43 ` Dave Hansen
2014-09-18 7:17 ` Kevin Easton
2014-09-18 7:17 ` Kevin Easton
2014-09-18 6:20 ` Dave Hansen
2014-09-18 6:20 ` Dave Hansen
2014-09-11 8:46 ` [PATCH v8 09/10] x86, mpx: cleanup unused bound tables Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-11 14:59 ` Dave Hansen
2014-09-11 14:59 ` Dave Hansen
2014-09-12 3:02 ` Ren, Qiaowei
2014-09-12 3:02 ` Ren, Qiaowei
2014-09-12 4:59 ` Dave Hansen
2014-09-12 4:59 ` Dave Hansen
2014-09-15 20:53 ` Dave Hansen
2014-09-15 20:53 ` Dave Hansen
2014-09-16 8:06 ` Ren, Qiaowei
2014-09-16 8:06 ` Ren, Qiaowei
2014-09-11 8:46 ` [PATCH v8 10/10] x86, mpx: add documentation on Intel MPX Qiaowei Ren
2014-09-11 8:46 ` Qiaowei Ren
2014-09-12 0:51 ` [PATCH v8 00/10] Intel MPX support Dave Hansen
2014-09-12 0:51 ` Dave Hansen
2014-09-12 19:21 ` Thomas Gleixner
2014-09-12 19:21 ` Thomas Gleixner
2014-09-12 21:23 ` Dave Hansen
2014-09-12 21:23 ` Dave Hansen
2014-09-13 9:25 ` Thomas Gleixner
2014-09-13 9:25 ` Thomas Gleixner
2014-09-12 21:31 ` Dave Hansen
2014-09-12 21:31 ` Dave Hansen
2014-09-12 22:08 ` Dave Hansen
2014-09-12 22:08 ` Dave Hansen
2014-09-13 9:39 ` Thomas Gleixner
2014-09-13 9:39 ` Thomas Gleixner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=54137A79.6060602@intel.com \
--to=dave.hansen@intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mingo@redhat.com \
--cc=qiaowei.ren@intel.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.