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SubjectRe: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)
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On 03/07/2016 09:56 AM, David Miller wrote:
> From: Khalid Aziz <khalid.aziz@oracle.com>
> Date: Mon, 7 Mar 2016 08:07:53 -0700
>
>> PR_GET_SPARC_ADICAPS
>
> Put this into a new ELF auxiliary vector entry via ARCH_DLINFO.
>
> So now all that's left is supposedly the TAG stuff, please explain
> that to me so I can direct you to the correct existing interface to
> provide that as well.
>
> Really, try to avoid prtctl, it's poorly typed and almost worse than
> ioctl().
>

The two remaining operations I am looking at are:

1. Is PSTATE.mcde bit set for the process? PR_SET_SPARC_ADI provides
this in its return value in the patch I sent.

2. Is TTE.mcd set for a given virtual address? PR_GET_SPARC_ADI_STATUS
provides this function in the patch I sent.

Setting and clearing version tags can be done entirely from userspace:

while (addr < end) {
asm volatile(
"stxa %1, [%0]ASI_MCD_PRIMARY\n\t"
:
: "r" (addr), "r" (version));
addr += adicap.blksz;
}
so I do not have to add any kernel code for tags.

Thanks,
Khalid

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