[PATCH 4.1 040/159] crypto: vmx - Adding enable_kernel_vsx() to access VSX instructions

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Leonidas Da Silva Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>

commit 2d6f0600b2cd755959527230ef5a6fba97bb762a upstream.

vmx-crypto driver make use of some VSX instructions which are
only available if VSX is enabled. Running in cases where VSX
are not enabled vmx-crypto fails in a VSX exception.

In order to fix this enable_kernel_vsx() was added to turn on
VSX instructions for vmx-crypto.

Signed-off-by: Leonidas S. Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/crypto/vmx/aes.c     |    3 +++
 drivers/crypto/vmx/aes_cbc.c |    3 +++
 drivers/crypto/vmx/aes_ctr.c |    3 +++
 drivers/crypto/vmx/ghash.c   |    4 ++++
 4 files changed, 13 insertions(+)

--- a/drivers/crypto/vmx/aes.c
+++ b/drivers/crypto/vmx/aes.c
@@ -80,6 +80,7 @@ static int p8_aes_setkey(struct crypto_t
 
     pagefault_disable();
     enable_kernel_altivec();
+    enable_kernel_vsx();
     ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
     ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
     pagefault_enable();
@@ -97,6 +98,7 @@ static void p8_aes_encrypt(struct crypto
     } else {
         pagefault_disable();
         enable_kernel_altivec();
+        enable_kernel_vsx();
         aes_p8_encrypt(src, dst, &ctx->enc_key);
         pagefault_enable();
     }
@@ -111,6 +113,7 @@ static void p8_aes_decrypt(struct crypto
     } else {
         pagefault_disable();
         enable_kernel_altivec();
+        enable_kernel_vsx();
         aes_p8_decrypt(src, dst, &ctx->dec_key);
         pagefault_enable();
     }
--- a/drivers/crypto/vmx/aes_cbc.c
+++ b/drivers/crypto/vmx/aes_cbc.c
@@ -81,6 +81,7 @@ static int p8_aes_cbc_setkey(struct cryp
 
     pagefault_disable();
     enable_kernel_altivec();
+    enable_kernel_vsx();
     ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
     ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
     pagefault_enable();
@@ -108,6 +109,7 @@ static int p8_aes_cbc_encrypt(struct blk
     } else {
         pagefault_disable();
         enable_kernel_altivec();
+        enable_kernel_vsx();
 
 	blkcipher_walk_init(&walk, dst, src, nbytes);
         ret = blkcipher_walk_virt(desc, &walk);
@@ -143,6 +145,7 @@ static int p8_aes_cbc_decrypt(struct blk
     } else {
         pagefault_disable();
         enable_kernel_altivec();
+        enable_kernel_vsx();
 
 	blkcipher_walk_init(&walk, dst, src, nbytes);
         ret = blkcipher_walk_virt(desc, &walk);
--- a/drivers/crypto/vmx/aes_ctr.c
+++ b/drivers/crypto/vmx/aes_ctr.c
@@ -79,6 +79,7 @@ static int p8_aes_ctr_setkey(struct cryp
 
     pagefault_disable();
     enable_kernel_altivec();
+    enable_kernel_vsx();
     ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
     pagefault_enable();
 
@@ -97,6 +98,7 @@ static void p8_aes_ctr_final(struct p8_a
 
     pagefault_disable();
     enable_kernel_altivec();
+    enable_kernel_vsx();
     aes_p8_encrypt(ctrblk, keystream, &ctx->enc_key);
     pagefault_enable();
 
@@ -127,6 +129,7 @@ static int p8_aes_ctr_crypt(struct blkci
         while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
             pagefault_disable();
             enable_kernel_altivec();
+            enable_kernel_vsx();
             aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr, walk.dst.virt.addr,
                 (nbytes & AES_BLOCK_MASK)/AES_BLOCK_SIZE, &ctx->enc_key, walk.iv);
             pagefault_enable();
--- a/drivers/crypto/vmx/ghash.c
+++ b/drivers/crypto/vmx/ghash.c
@@ -116,6 +116,7 @@ static int p8_ghash_setkey(struct crypto
 
     pagefault_disable();
     enable_kernel_altivec();
+    enable_kernel_vsx();
     enable_kernel_fp();
     gcm_init_p8(ctx->htable, (const u64 *) key);
     pagefault_enable();
@@ -142,6 +143,7 @@ static int p8_ghash_update(struct shash_
                     GHASH_DIGEST_SIZE - dctx->bytes);
             pagefault_disable();
             enable_kernel_altivec();
+            enable_kernel_vsx();
             enable_kernel_fp();
             gcm_ghash_p8(dctx->shash, ctx->htable, dctx->buffer,
                     GHASH_DIGEST_SIZE);
@@ -154,6 +156,7 @@ static int p8_ghash_update(struct shash_
         if (len) {
             pagefault_disable();
             enable_kernel_altivec();
+            enable_kernel_vsx();
             enable_kernel_fp();
             gcm_ghash_p8(dctx->shash, ctx->htable, src, len);
             pagefault_enable();
@@ -182,6 +185,7 @@ static int p8_ghash_final(struct shash_d
                 dctx->buffer[i] = 0;
             pagefault_disable();
             enable_kernel_altivec();
+            enable_kernel_vsx();
             enable_kernel_fp();
             gcm_ghash_p8(dctx->shash, ctx->htable, dctx->buffer,
                     GHASH_DIGEST_SIZE);


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