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crypto: simd,testmgr - introduce crypto_simd_usable()

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So that the no-SIMD fallback code can be tested by the crypto
self-tests, add a macro crypto_simd_usable() which wraps may_use_simd(),
but also returns false if the crypto self-tests have set a per-CPU bool
to disable SIMD in crypto code on the current CPU.

Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Eric Biggers 2019-03-12 22:12:47 -07:00 • committed by Herbert Xu
commit b55e1a3954
2 changed files with 49 additions and 1 deletions
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26
crypto/testmgr.c
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@ -37,6 +37,7 @@
#include <crypto/akcipher.h>
#include <crypto/kpp.h>
#include <crypto/acompress.h>
#include <crypto/internal/simd.h>
#include "internal.h"
@ -52,6 +53,9 @@ MODULE_PARM_DESC(noextratests, "disable expensive crypto self-tests");
static unsigned int fuzz_iterations = 100;
module_param(fuzz_iterations, uint, 0644);
MODULE_PARM_DESC(fuzz_iterations, "number of fuzz test iterations");
DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
#endif
#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
@ -838,7 +842,27 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
WARN_ON_ONCE(!valid_testvec_config(cfg));
}
#endif /* CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
static void crypto_disable_simd_for_test(void)
{
preempt_disable();
__this_cpu_write(crypto_simd_disabled_for_test, true);
}
static void crypto_reenable_simd_for_test(void)
{
__this_cpu_write(crypto_simd_disabled_for_test, false);
preempt_enable();
}
#else /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
static void crypto_disable_simd_for_test(void)
{
}
static void crypto_reenable_simd_for_test(void)
{
}
#endif /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
static int check_nonfinal_hash_op(const char *op, int err,
u8 *result, unsigned int digestsize,