On Thu, Feb 07, 2019 at 06:57:20PM +0100, Peter Zijlstra wrote: > Something like so then? AFAICT CLFLUSH will also #GP if feed it crap.
Correct. CFLUSH will also #GP on a non-canonical address. > - __flush_tlb_one_kernel(__cpa_addr(cpa, i)); > + __flush_tlb_one_kernel(fix_addr(__cpa_addr(cpa, i))); > - clflush_cache_range_opt((void *)addr, PAGE_SIZE); > + clflush_cache_range_opt((void *)fix_addr(addr), > PAGE_SIZE); Looks like as close as you can get without being crazy. Many/most of the apparent function calls here are going to be inlined. So likely safe. Tried it out and it works! So: Tested-by: Tony Luck <tony.l...@intel.com> Thanks -Tony
