On Wed, 2018-05-30 at 10:31:22 UTC, Nicholas Piggin wrote: > The stores to update the SLB shadow area must be made as they appear > in the C code, so that the hypervisor does not see an entry with > mismatched vsid and esid. Use WRITE_ONCE for this. > > GCC has been observed to elide the first store to esid in the update, > which means that if the hypervisor interrupts the guest after storing > to vsid, it could see an entry with old esid and new vsid, which may > possibly result in memory corruption. > > Signed-off-by: Nicholas Piggin <npig...@gmail.com>
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/926bc2f100c24d4842b3064b5af44a cheers
