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| author | Anton Blanchard <anton@samba.org> | 2015-10-29 11:44:05 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-01 13:52:25 +1100 |
| commit | dc4fbba11e4661a6a77a1f89ba32f9082e6395ff (patch) | |
| tree | 567037dc8e93063615e558eda1c80f8a82154749 /drivers/crypto/vmx/aes_ctr.c | |
| parent | a0e72cf12b1a1f159b6822ed2e1e41893d996fc7 (diff) | |
| download | lwn-dc4fbba11e4661a6a77a1f89ba32f9082e6395ff.tar.gz lwn-dc4fbba11e4661a6a77a1f89ba32f9082e6395ff.zip | |
powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()
The enable_kernel_*() functions leave the relevant MSR bits enabled
until we exit the kernel sometime later. Create disable versions
that wrap the kernel use of FP, Altivec VSX or SPE.
While we don't want to disable it normally for performance reasons
(MSR writes are slow), it will be used for a debug boot option that
does this and catches bad uses in other areas of the kernel.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/crypto/vmx/aes_ctr.c')
| -rw-r--r-- | drivers/crypto/vmx/aes_ctr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/crypto/vmx/aes_ctr.c b/drivers/crypto/vmx/aes_ctr.c index 80958660c31a..2d58b18acc10 100644 --- a/drivers/crypto/vmx/aes_ctr.c +++ b/drivers/crypto/vmx/aes_ctr.c @@ -83,6 +83,7 @@ static int p8_aes_ctr_setkey(struct crypto_tfm *tfm, const u8 *key, pagefault_disable(); enable_kernel_vsx(); ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key); + disable_kernel_vsx(); pagefault_enable(); ret += crypto_blkcipher_setkey(ctx->fallback, key, keylen); @@ -101,6 +102,7 @@ static void p8_aes_ctr_final(struct p8_aes_ctr_ctx *ctx, pagefault_disable(); enable_kernel_vsx(); aes_p8_encrypt(ctrblk, keystream, &ctx->enc_key); + disable_kernel_vsx(); pagefault_enable(); crypto_xor(keystream, src, nbytes); @@ -139,6 +141,7 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc, AES_BLOCK_SIZE, &ctx->enc_key, walk.iv); + disable_kernel_vsx(); pagefault_enable(); /* We need to update IV mostly for last bytes/round */ |