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powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()

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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>
This commit is contained in:
Anton Blanchard
2015-10-29 11:44:05 +11:00
committed by Michael Ellerman
parent a0e72cf12b
commit dc4fbba11e
15 changed files with 39 additions and 0 deletions
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4
drivers/crypto/vmx/ghash.c
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@@ -120,6 +120,7 @@ static int p8_ghash_setkey(struct crypto_shash *tfm, const u8 *key,
pagefault_disable();
enable_kernel_vsx();
gcm_init_p8(ctx->htable, (const u64 *) key);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
return crypto_shash_setkey(ctx->fallback, key, keylen);
@@ -150,6 +151,7 @@ static int p8_ghash_update(struct shash_desc *desc,
enable_kernel_vsx();
gcm_ghash_p8(dctx->shash, ctx->htable,
dctx->buffer, GHASH_DIGEST_SIZE);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
src += GHASH_DIGEST_SIZE - dctx->bytes;
@@ -162,6 +164,7 @@ static int p8_ghash_update(struct shash_desc *desc,
pagefault_disable();
enable_kernel_vsx();
gcm_ghash_p8(dctx->shash, ctx->htable, src, len);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
src += len;
@@ -192,6 +195,7 @@ static int p8_ghash_final(struct shash_desc *desc, u8 *out)
enable_kernel_vsx();
gcm_ghash_p8(dctx->shash, ctx->htable,
dctx->buffer, GHASH_DIGEST_SIZE);
disable_kernel_vsx();
pagefault_enable();
preempt_enable();
dctx->bytes = 0;