From 25deecb21c18ee29e3be8ac6177b2a9504c33d2d Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 14 Jun 2022 02:09:00 +0900 Subject: [PATCH 1/6] s390: remove unneeded 'select BUILD_BIN2C' Since commit 4c0f032d4963 ("s390/purgatory: Omit use of bin2c"), s390 builds the purgatory without using bin2c. Remove 'select BUILD_BIN2C' to avoid the unneeded build of bin2c. Fixes: 4c0f032d4963 ("s390/purgatory: Omit use of bin2c") Signed-off-by: Masahiro Yamada Link: https://lore.kernel.org/r/20220613170902.1775211-1-masahiroy@kernel.org Signed-off-by: Alexander Gordeev --- arch/s390/Kconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 91c0b80a8bf0..8cd9e56c629b 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -484,7 +484,6 @@ config KEXEC config KEXEC_FILE bool "kexec file based system call" select KEXEC_CORE - select BUILD_BIN2C depends on CRYPTO depends on CRYPTO_SHA256 depends on CRYPTO_SHA256_S390 From b9a56c113f907b19b91dc5c2383b0169831e15a4 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 14 Jun 2022 02:09:01 +0900 Subject: [PATCH 2/6] s390/purgatory: hard-code obj-y in Makefile The purgatory/ directory is entirely guarded in arch/s390/Kbuild. CONFIG_ARCH_HAS_KEXEC_PURGATORY is bool type. $(CONFIG_ARCH_HAS_KEXEC_PURGATORY) is always 'y' when Kbuild visits this Makefile for building. Signed-off-by: Masahiro Yamada Link: https://lore.kernel.org/r/20220613170902.1775211-2-masahiroy@kernel.org Signed-off-by: Alexander Gordeev --- arch/s390/purgatory/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile index 360ada80d20c..3e2c17ba04de 100644 --- a/arch/s390/purgatory/Makefile +++ b/arch/s390/purgatory/Makefile @@ -51,4 +51,4 @@ $(obj)/purgatory.ro: $(obj)/purgatory $(obj)/purgatory.chk FORCE $(obj)/kexec-purgatory.o: $(obj)/kexec-purgatory.S $(obj)/purgatory.ro FORCE $(call if_changed_rule,as_o_S) -obj-$(CONFIG_ARCH_HAS_KEXEC_PURGATORY) += kexec-purgatory.o +obj-y += kexec-purgatory.o From 20159e287a031bd6a28429675ccc66b06372fa3c Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 14 Jun 2022 02:09:02 +0900 Subject: [PATCH 3/6] s390/purgatory: remove duplicated build rule of kexec-purgatory.o This is equivalent to the pattern rule in scripts/Makefile.build. Having the dependency on $(obj)/purgatory.ro is enough. Signed-off-by: Masahiro Yamada Link: https://lore.kernel.org/r/20220613170902.1775211-3-masahiroy@kernel.org Signed-off-by: Alexander Gordeev --- arch/s390/purgatory/Makefile | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile index 3e2c17ba04de..d237bc6841cb 100644 --- a/arch/s390/purgatory/Makefile +++ b/arch/s390/purgatory/Makefile @@ -48,7 +48,6 @@ OBJCOPYFLAGS_purgatory.ro += --remove-section='.note.*' $(obj)/purgatory.ro: $(obj)/purgatory $(obj)/purgatory.chk FORCE $(call if_changed,objcopy) -$(obj)/kexec-purgatory.o: $(obj)/kexec-purgatory.S $(obj)/purgatory.ro FORCE - $(call if_changed_rule,as_o_S) +$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro obj-y += kexec-purgatory.o From e4f74400308cb8abde5fdc9cad609c2aba32110c Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Sat, 11 Jun 2022 00:20:23 +0200 Subject: [PATCH 4/6] s390/archrandom: simplify back to earlier design and initialize earlier s390x appears to present two RNG interfaces: - a "TRNG" that gathers entropy using some hardware function; and - a "DRBG" that takes in a seed and expands it. Previously, the TRNG was wired up to arch_get_random_{long,int}(), but it was observed that this was being called really frequently, resulting in high overhead. So it was changed to be wired up to arch_get_random_ seed_{long,int}(), which was a reasonable decision. Later on, the DRBG was then wired up to arch_get_random_{long,int}(), with a complicated buffer filling thread, to control overhead and rate. Fortunately, none of the performance issues matter much now. The RNG always attempts to use arch_get_random_seed_{long,int}() first, which means a complicated implementation of arch_get_random_{long,int}() isn't really valuable or useful to have around. And it's only used when reseeding, which means it won't hit the high throughput complications that were faced before. So this commit returns to an earlier design of just calling the TRNG in arch_get_random_seed_{long,int}(), and returning false in arch_get_ random_{long,int}(). Part of what makes the simplification possible is that the RNG now seeds itself using the TRNG at bootup. But this only works if the TRNG is detected early in boot, before random_init() is called. So this commit also causes that check to happen in setup_arch(). Cc: stable@vger.kernel.org Cc: Harald Freudenberger Cc: Ingo Franzki Cc: Juergen Christ Cc: Heiko Carstens Signed-off-by: Jason A. Donenfeld Link: https://lore.kernel.org/r/20220610222023.378448-1-Jason@zx2c4.com Reviewed-by: Harald Freudenberger Acked-by: Heiko Carstens Signed-off-by: Alexander Gordeev --- arch/s390/crypto/arch_random.c | 217 ----------------------------- arch/s390/include/asm/archrandom.h | 14 +- arch/s390/kernel/setup.c | 5 + 3 files changed, 12 insertions(+), 224 deletions(-) diff --git a/arch/s390/crypto/arch_random.c b/arch/s390/crypto/arch_random.c index 56007c763902..1f2d40993c4d 100644 --- a/arch/s390/crypto/arch_random.c +++ b/arch/s390/crypto/arch_random.c @@ -4,232 +4,15 @@ * * Copyright IBM Corp. 2017, 2020 * Author(s): Harald Freudenberger - * - * The s390_arch_random_generate() function may be called from random.c - * in interrupt context. So this implementation does the best to be very - * fast. There is a buffer of random data which is asynchronously checked - * and filled by a workqueue thread. - * If there are enough bytes in the buffer the s390_arch_random_generate() - * just delivers these bytes. Otherwise false is returned until the - * worker thread refills the buffer. - * The worker fills the rng buffer by pulling fresh entropy from the - * high quality (but slow) true hardware random generator. This entropy - * is then spread over the buffer with an pseudo random generator PRNG. - * As the arch_get_random_seed_long() fetches 8 bytes and the calling - * function add_interrupt_randomness() counts this as 1 bit entropy the - * distribution needs to make sure there is in fact 1 bit entropy contained - * in 8 bytes of the buffer. The current values pull 32 byte entropy - * and scatter this into a 2048 byte buffer. So 8 byte in the buffer - * will contain 1 bit of entropy. - * The worker thread is rescheduled based on the charge level of the - * buffer but at least with 500 ms delay to avoid too much CPU consumption. - * So the max. amount of rng data delivered via arch_get_random_seed is - * limited to 4k bytes per second. */ #include #include #include -#include #include -#include -#include #include DEFINE_STATIC_KEY_FALSE(s390_arch_random_available); atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0); EXPORT_SYMBOL(s390_arch_random_counter); - -#define ARCH_REFILL_TICKS (HZ/2) -#define ARCH_PRNG_SEED_SIZE 32 -#define ARCH_RNG_BUF_SIZE 2048 - -static DEFINE_SPINLOCK(arch_rng_lock); -static u8 *arch_rng_buf; -static unsigned int arch_rng_buf_idx; - -static void arch_rng_refill_buffer(struct work_struct *); -static DECLARE_DELAYED_WORK(arch_rng_work, arch_rng_refill_buffer); - -bool s390_arch_random_generate(u8 *buf, unsigned int nbytes) -{ - /* max hunk is ARCH_RNG_BUF_SIZE */ - if (nbytes > ARCH_RNG_BUF_SIZE) - return false; - - /* lock rng buffer */ - if (!spin_trylock(&arch_rng_lock)) - return false; - - /* try to resolve the requested amount of bytes from the buffer */ - arch_rng_buf_idx -= nbytes; - if (arch_rng_buf_idx < ARCH_RNG_BUF_SIZE) { - memcpy(buf, arch_rng_buf + arch_rng_buf_idx, nbytes); - atomic64_add(nbytes, &s390_arch_random_counter); - spin_unlock(&arch_rng_lock); - return true; - } - - /* not enough bytes in rng buffer, refill is done asynchronously */ - spin_unlock(&arch_rng_lock); - - return false; -} -EXPORT_SYMBOL(s390_arch_random_generate); - -static void arch_rng_refill_buffer(struct work_struct *unused) -{ - unsigned int delay = ARCH_REFILL_TICKS; - - spin_lock(&arch_rng_lock); - if (arch_rng_buf_idx > ARCH_RNG_BUF_SIZE) { - /* buffer is exhausted and needs refill */ - u8 seed[ARCH_PRNG_SEED_SIZE]; - u8 prng_wa[240]; - /* fetch ARCH_PRNG_SEED_SIZE bytes of entropy */ - cpacf_trng(NULL, 0, seed, sizeof(seed)); - /* blow this entropy up to ARCH_RNG_BUF_SIZE with PRNG */ - memset(prng_wa, 0, sizeof(prng_wa)); - cpacf_prno(CPACF_PRNO_SHA512_DRNG_SEED, - &prng_wa, NULL, 0, seed, sizeof(seed)); - cpacf_prno(CPACF_PRNO_SHA512_DRNG_GEN, - &prng_wa, arch_rng_buf, ARCH_RNG_BUF_SIZE, NULL, 0); - arch_rng_buf_idx = ARCH_RNG_BUF_SIZE; - } - delay += (ARCH_REFILL_TICKS * arch_rng_buf_idx) / ARCH_RNG_BUF_SIZE; - spin_unlock(&arch_rng_lock); - - /* kick next check */ - queue_delayed_work(system_long_wq, &arch_rng_work, delay); -} - -/* - * Here follows the implementation of s390_arch_get_random_long(). - * - * The random longs to be pulled by arch_get_random_long() are - * prepared in an 4K buffer which is filled from the NIST 800-90 - * compliant s390 drbg. By default the random long buffer is refilled - * 256 times before the drbg itself needs a reseed. The reseed of the - * drbg is done with 32 bytes fetched from the high quality (but slow) - * trng which is assumed to deliver 100% entropy. So the 32 * 8 = 256 - * bits of entropy are spread over 256 * 4KB = 1MB serving 131072 - * arch_get_random_long() invocations before reseeded. - * - * How often the 4K random long buffer is refilled with the drbg - * before the drbg is reseeded can be adjusted. There is a module - * parameter 's390_arch_rnd_long_drbg_reseed' accessible via - * /sys/module/arch_random/parameters/rndlong_drbg_reseed - * or as kernel command line parameter - * arch_random.rndlong_drbg_reseed= - * This parameter tells how often the drbg fills the 4K buffer before - * it is re-seeded by fresh entropy from the trng. - * A value of 16 results in reseeding the drbg at every 16 * 4 KB = 64 - * KB with 32 bytes of fresh entropy pulled from the trng. So a value - * of 16 would result in 256 bits entropy per 64 KB. - * A value of 256 results in 1MB of drbg output before a reseed of the - * drbg is done. So this would spread the 256 bits of entropy among 1MB. - * Setting this parameter to 0 forces the reseed to take place every - * time the 4K buffer is depleted, so the entropy rises to 256 bits - * entropy per 4K or 0.5 bit entropy per arch_get_random_long(). With - * setting this parameter to negative values all this effort is - * disabled, arch_get_random long() returns false and thus indicating - * that the arch_get_random_long() feature is disabled at all. - */ - -static unsigned long rndlong_buf[512]; -static DEFINE_SPINLOCK(rndlong_lock); -static int rndlong_buf_index; - -static int rndlong_drbg_reseed = 256; -module_param_named(rndlong_drbg_reseed, rndlong_drbg_reseed, int, 0600); -MODULE_PARM_DESC(rndlong_drbg_reseed, "s390 arch_get_random_long() drbg reseed"); - -static inline void refill_rndlong_buf(void) -{ - static u8 prng_ws[240]; - static int drbg_counter; - - if (--drbg_counter < 0) { - /* need to re-seed the drbg */ - u8 seed[32]; - - /* fetch seed from trng */ - cpacf_trng(NULL, 0, seed, sizeof(seed)); - /* seed drbg */ - memset(prng_ws, 0, sizeof(prng_ws)); - cpacf_prno(CPACF_PRNO_SHA512_DRNG_SEED, - &prng_ws, NULL, 0, seed, sizeof(seed)); - /* re-init counter for drbg */ - drbg_counter = rndlong_drbg_reseed; - } - - /* fill the arch_get_random_long buffer from drbg */ - cpacf_prno(CPACF_PRNO_SHA512_DRNG_GEN, &prng_ws, - (u8 *) rndlong_buf, sizeof(rndlong_buf), - NULL, 0); -} - -bool s390_arch_get_random_long(unsigned long *v) -{ - bool rc = false; - unsigned long flags; - - /* arch_get_random_long() disabled ? */ - if (rndlong_drbg_reseed < 0) - return false; - - /* try to lock the random long lock */ - if (!spin_trylock_irqsave(&rndlong_lock, flags)) - return false; - - if (--rndlong_buf_index >= 0) { - /* deliver next long value from the buffer */ - *v = rndlong_buf[rndlong_buf_index]; - rc = true; - goto out; - } - - /* buffer is depleted and needs refill */ - if (in_interrupt()) { - /* delay refill in interrupt context to next caller */ - rndlong_buf_index = 0; - goto out; - } - - /* refill random long buffer */ - refill_rndlong_buf(); - rndlong_buf_index = ARRAY_SIZE(rndlong_buf); - - /* and provide one random long */ - *v = rndlong_buf[--rndlong_buf_index]; - rc = true; - -out: - spin_unlock_irqrestore(&rndlong_lock, flags); - return rc; -} -EXPORT_SYMBOL(s390_arch_get_random_long); - -static int __init s390_arch_random_init(void) -{ - /* all the needed PRNO subfunctions available ? */ - if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG) && - cpacf_query_func(CPACF_PRNO, CPACF_PRNO_SHA512_DRNG_GEN)) { - - /* alloc arch random working buffer */ - arch_rng_buf = kmalloc(ARCH_RNG_BUF_SIZE, GFP_KERNEL); - if (!arch_rng_buf) - return -ENOMEM; - - /* kick worker queue job to fill the random buffer */ - queue_delayed_work(system_long_wq, - &arch_rng_work, ARCH_REFILL_TICKS); - - /* enable arch random to the outside world */ - static_branch_enable(&s390_arch_random_available); - } - - return 0; -} -arch_initcall(s390_arch_random_init); diff --git a/arch/s390/include/asm/archrandom.h b/arch/s390/include/asm/archrandom.h index 5dc712fde3c7..2c6e1c6ecbe7 100644 --- a/arch/s390/include/asm/archrandom.h +++ b/arch/s390/include/asm/archrandom.h @@ -15,17 +15,13 @@ #include #include +#include DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); extern atomic64_t s390_arch_random_counter; -bool s390_arch_get_random_long(unsigned long *v); -bool s390_arch_random_generate(u8 *buf, unsigned int nbytes); - static inline bool __must_check arch_get_random_long(unsigned long *v) { - if (static_branch_likely(&s390_arch_random_available)) - return s390_arch_get_random_long(v); return false; } @@ -37,7 +33,9 @@ static inline bool __must_check arch_get_random_int(unsigned int *v) static inline bool __must_check arch_get_random_seed_long(unsigned long *v) { if (static_branch_likely(&s390_arch_random_available)) { - return s390_arch_random_generate((u8 *)v, sizeof(*v)); + cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v)); + atomic64_add(sizeof(*v), &s390_arch_random_counter); + return true; } return false; } @@ -45,7 +43,9 @@ static inline bool __must_check arch_get_random_seed_long(unsigned long *v) static inline bool __must_check arch_get_random_seed_int(unsigned int *v) { if (static_branch_likely(&s390_arch_random_available)) { - return s390_arch_random_generate((u8 *)v, sizeof(*v)); + cpacf_trng(NULL, 0, (u8 *)v, sizeof(*v)); + atomic64_add(sizeof(*v), &s390_arch_random_counter); + return true; } return false; } diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 8d91eccc0963..0a37f5de2863 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -875,6 +875,11 @@ static void __init setup_randomness(void) if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); memblock_free(vmms, PAGE_SIZE); + +#ifdef CONFIG_ARCH_RANDOM + if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) + static_branch_enable(&s390_arch_random_available); +#endif } /* From d608f45ed3cfd411a409cec93fa64232181752ff Mon Sep 17 00:00:00 2001 From: Jiang Jian Date: Wed, 22 Jun 2022 22:27:13 +0800 Subject: [PATCH 5/6] s390/sclp: Fix typo in comments Remove the repeated word 'and' from comments Signed-off-by: Jiang Jian Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20220622142713.14187-1-jiangjian@cdjrlc.com Signed-off-by: Alexander Gordeev --- drivers/s390/char/sclp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index cb2491761958..ae1d6ee382a5 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -60,7 +60,7 @@ static LIST_HEAD(sclp_reg_list); /* List of queued requests. */ static LIST_HEAD(sclp_req_queue); -/* Data for read and and init requests. */ +/* Data for read and init requests. */ static struct sclp_req sclp_read_req; static struct sclp_req sclp_init_req; static void *sclp_read_sccb; From d7d488f41b41a1b7a1df3c74f2f65eb4585f5d55 Mon Sep 17 00:00:00 2001 From: Zhang Jiaming Date: Thu, 23 Jun 2022 14:05:43 +0800 Subject: [PATCH 6/6] s390/qdio: Fix spelling mistake Change 'defineable' to 'definable'. Change 'paramater' to 'parameter'. Signed-off-by: Zhang Jiaming Reviewed-by: Benjamin Block Link: https://lore.kernel.org/r/20220623060543.12870-1-jiaming@nfschina.com Signed-off-by: Alexander Gordeev --- arch/s390/include/asm/qdio.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/s390/include/asm/qdio.h b/arch/s390/include/asm/qdio.h index 54ae2dc65e3b..2f983e0b95e0 100644 --- a/arch/s390/include/asm/qdio.h +++ b/arch/s390/include/asm/qdio.h @@ -133,9 +133,9 @@ struct slibe { * @sb_count: number of storage blocks * @sba: storage block element addresses * @dcount: size of storage block elements - * @user0: user defineable value - * @res4: reserved paramater - * @user1: user defineable value + * @user0: user definable value + * @res4: reserved parameter + * @user1: user definable value */ struct qaob { u64 res0[6];