Messages in this thread | | | Date | Thu, 18 Mar 2021 18:56:07 +0000 | From | Catalin Marinas <> | Subject | Re: [PATCH v16 0/9] arm64: ARMv8.5-A: MTE: Add async mode support |
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On Mon, Mar 15, 2021 at 01:20:10PM +0000, Vincenzo Frascino wrote: > This patchset implements the asynchronous mode support for ARMv8.5-A > Memory Tagging Extension (MTE), which is a debugging feature that allows > to detect with the help of the architecture the C and C++ programmatic > memory errors like buffer overflow, use-after-free, use-after-return, etc. > > MTE is built on top of the AArch64 v8.0 virtual address tagging TBI > (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any > subset of its address space that is multiple of a 16 bytes granule. MTE > is based on a lock-key mechanism where the lock is the tag associated to > the physical memory and the key is the tag associated to the virtual > address. > When MTE is enabled and tags are set for ranges of address space of a task, > the PE will compare the tag related to the physical memory with the tag > related to the virtual address (tag check operation). Access to the memory > is granted only if the two tags match. In case of mismatch the PE will raise > an exception. > > The exception can be handled synchronously or asynchronously. When the > asynchronous mode is enabled: > - Upon fault the PE updates the TFSR_EL1 register. > - The kernel detects the change during one of the following: > - Context switching > - Return to user/EL0 > - Kernel entry from EL1 > - Kernel exit to EL1 > - If the register has been updated by the PE the kernel clears it and > reports the error. > > The series is based on linux-next/akpm.
Andrew, could you please pick these patches up via the mm tree? They depend on kasan patches already queued.
Andrey, all the kasan patches have your acked-by with the google.com address and you've been cc'ed on that. You may want to update the .mailmap file in the kernel.
Thanks.
-- Catalin
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