On 10/30/17 12:57 PM, Borislav Petkov wrote: > On Mon, Oct 30, 2017 at 12:49:14PM -0500, Brijesh Singh wrote: >> If the buffer is allocated on the stack then there is no guarantee that > static global is not allocated on the stack. Okay, Just tried static global with CONFIG_VMAP_STACK=y and I am getting wrong physical address with __pa. PSP command fails with error code "INVALID_ADDRESS". The same thing works fine with kmalloc() buffer. >> I can certainly move the allocation outside, but then it may increase the >> code size in other functions. If its not a big deal then I would prefer to >> keep what we have. > Avoiding repeated k*alloc calls is always a good thing. Actually kmalloc-ing 20 > bytes each time sounds like it is not worth the calling overhead to me. > To avoid repeated k*alloc calls, I could devm_kzalloc() these variable during sev_init() and reuse them when needed.
