diff options
| -rw-r--r-- | arch/x86/crypto/chacha_glue.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/crypto/chacha_glue.c b/arch/x86/crypto/chacha_glue.c index d19c2908be90..9b1d3fac4943 100644 --- a/arch/x86/crypto/chacha_glue.c +++ b/arch/x86/crypto/chacha_glue.c @@ -132,6 +132,7 @@ static int chacha_simd_stream_xor(struct skcipher_request *req, { u32 *state, state_buf[16 + 2] __aligned(8); struct skcipher_walk walk; + int next_yield = 4096; /* bytes until next FPU yield */ int err; BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16); @@ -144,12 +145,21 @@ static int chacha_simd_stream_xor(struct skcipher_request *req, while (walk.nbytes > 0) { unsigned int nbytes = walk.nbytes; - if (nbytes < walk.total) + if (nbytes < walk.total) { nbytes = round_down(nbytes, walk.stride); + next_yield -= nbytes; + } chacha_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr, nbytes, ctx->nrounds); + if (next_yield <= 0) { + /* temporarily allow preemption */ + kernel_fpu_end(); + kernel_fpu_begin(); + next_yield = 4096; + } + err = skcipher_walk_done(&walk, walk.nbytes - nbytes); } |