On 15.08.20 20:21, Julien Grall wrote: Hi Julien
From: Julien Grall <jgr...@amazon.com> The IOREQ code is using cmpxchg() with 64-bit value. At the moment, this is x86 code, but there is plan to make it common. To cater 32-bit arch, introduce two new helpers to deal with 64-bit cmpxchg. The Arm 32-bit implementation of cmpxchg64() is based on the __cmpxchg64 in Linux v5.8 (arch/arm/include/asm/cmpxchg.h). Signed-off-by: Julien Grall <jgr...@amazon.com> Cc: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com> --- xen/include/asm-arm/arm32/cmpxchg.h | 68 +++++++++++++++++++++++++++++ xen/include/asm-arm/arm64/cmpxchg.h | 5 +++ xen/include/asm-arm/guest_atomics.h | 22 ++++++++++ xen/include/asm-x86/guest_atomics.h | 2 + xen/include/asm-x86/x86_64/system.h | 2 + 5 files changed, 99 insertions(+)
Thank you for doing this. I have successfully build-tested your patch with IOREQ series on Arm32/Arm64 (of course before that I had changed cmpxchg to guest_cmpxchg64 in hvm_send_buffered_ioreq()).
-- Regards, Oleksandr Tyshchenko
