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Patch "crypto: vmx - Adding enable_kernel_vsx() to access VSX instructions" has been added to the 4.2-stable tree

PATCH [email protected] 1 participant 1 message Sep 23, 2015

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Stable branch Crypto API
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This is a note to let you know that I've just added the patch titled

crypto: vmx - Adding enable_kernel_vsx() to access VSX instructions

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
crypto-vmx-adding-enable_kernel_vsx-to-access-vsx-instructions.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From 2d6f0600b2cd755959527230ef5a6fba97bb762a Mon Sep 17 00:00:00 2001

From: Leonidas Da Silva Barbosa <[email protected]>
Date: Mon, 13 Jul 2015 13:51:39 -0300
Subject: crypto: vmx - Adding enable_kernel_vsx() to access VSX instructions

From: Leonidas Da Silva Barbosa <[email protected]>

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 <[email protected]>
Signed-off-by Herbert Xu <[email protected]>
Signed-off-by Michael Ellerman <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 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(+)
drivers/crypto/vmx/aes.c +3 -0
@@ -84,6 +84,7 @@ static int p8_aes_setkey(struct crypto_t
 	preempt_disable();
 	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();

@@ -103,6 +104,7 @@ static void p8_aes_encrypt(struct crypto
 		preempt_disable();
 		pagefault_disable();
 		enable_kernel_altivec();
+		enable_kernel_vsx();
 		aes_p8_encrypt(src, dst, &ctx->enc_key);
 		pagefault_enable();
 		preempt_enable();

@@ -119,6 +121,7 @@ static void p8_aes_decrypt(struct crypto
 		preempt_disable();
 		pagefault_disable();
 		enable_kernel_altivec();
+		enable_kernel_vsx();
 		aes_p8_decrypt(src, dst, &ctx->dec_key);
 		pagefault_enable();
 		preempt_enable();
drivers/crypto/vmx/aes_cbc.c +3 -0
@@ -85,6 +85,7 @@ static int p8_aes_cbc_setkey(struct cryp
 	preempt_disable();
 	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();

@@ -115,6 +116,7 @@ static int p8_aes_cbc_encrypt(struct blk
 		preempt_disable();
 		pagefault_disable();
 		enable_kernel_altivec();
+		enable_kernel_vsx();
 
 		blkcipher_walk_init(&walk, dst, src, nbytes);
 		ret = blkcipher_walk_virt(desc, &walk);

@@ -155,6 +157,7 @@ static int p8_aes_cbc_decrypt(struct blk
 		preempt_disable();
 		pagefault_disable();
 		enable_kernel_altivec();
+		enable_kernel_vsx();
 
 		blkcipher_walk_init(&walk, dst, src, nbytes);
 		ret = blkcipher_walk_virt(desc, &walk);
drivers/crypto/vmx/aes_ctr.c +3 -0
@@ -82,6 +82,7 @@ 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();
 

@@ -100,6 +101,7 @@ 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();
 

@@ -132,6 +134,7 @@ 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 &
drivers/crypto/vmx/ghash.c +4 -0
@@ -119,6 +119,7 @@ static int p8_ghash_setkey(struct crypto
 	preempt_disable();
 	pagefault_disable();
 	enable_kernel_altivec();
+	enable_kernel_vsx();
 	enable_kernel_fp();
 	gcm_init_p8(ctx->htable, (const u64 *) key);
 	pagefault_enable();

@@ -149,6 +150,7 @@ static int p8_ghash_update(struct shash_
 			preempt_disable();
 			pagefault_disable();
 			enable_kernel_altivec();
+			enable_kernel_vsx();
 			enable_kernel_fp();
 			gcm_ghash_p8(dctx->shash, ctx->htable,
 				     dctx->buffer, GHASH_DIGEST_SIZE);

@@ -163,6 +165,7 @@ static int p8_ghash_update(struct shash_
 			preempt_disable();
 			pagefault_disable();
 			enable_kernel_altivec();
+			enable_kernel_vsx();
 			enable_kernel_fp();
 			gcm_ghash_p8(dctx->shash, ctx->htable, src, len);
 			pagefault_enable();

@@ -193,6 +196,7 @@ static int p8_ghash_final(struct shash_d
 			preempt_disable();
 			pagefault_disable();
 			enable_kernel_altivec();
+			enable_kernel_vsx();
 			enable_kernel_fp();
 			gcm_ghash_p8(dctx->shash, ctx->htable,
 				     dctx->buffer, GHASH_DIGEST_SIZE);

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/powerpc-uncomment-and-make-enable_kernel_vsx-routine-available.patch queue-4.2/crypto-vmx-adding-enable_kernel_vsx-to-access-vsx-instructions.patch