> -Original Message-
> From: H. Peter Anvin [mailto:h...@zytor.com]
> Sent: Tuesday, February 25, 2014 1:52 AM
> To: Hansen, Dave; Ren, Qiaowei; Thomas Gleixner; Ingo Molnar
> Cc: x...@kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v5 2/3] x86, mpx:
On 02/24/2014 09:27 AM, Dave Hansen wrote:
>
> Can you talk a little bit about what the design is here? Why does the
> kernel have to do the allocation of the virtual address space? Does it
> really need to MAP_POPULATE? bt_size looks like 4MB, and that's an
> awful lot of memory to eat up at o
On 02/23/2014 05:27 AM, Qiaowei Ren wrote:
> +static bool allocate_bt(unsigned long bd_entry)
> +{
> + unsigned long bt_size = 1UL << (MPX_L2_BITS+MPX_L2_SHIFT);
> + unsigned long bt_addr, old_val = 0;
> +
> + bt_addr = sys_mmap_pgoff(0, bt_size, PROT_READ | PROT_WRITE,
> +
An access to an invalid bound directory entry will cause a #BR
exception. This patch hook #BR exception handler to allocate
one bound table and bind it with that buond directory entry.
This will avoid the need of forwarding the #BR exception
to the user space when bound directory has invalid entry
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