Messages in this thread | | | Subject | Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) | From | Khalid Aziz <> | Date | Mon, 7 Mar 2016 11:04:38 -0700 |
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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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