diff options
author | Raghavendra Rao Ananta <rananta@google.com> | 2021-10-07 23:34:35 +0000 |
---|---|---|
committer | Marc Zyngier <maz@kernel.org> | 2021-10-17 11:17:21 +0100 |
commit | 414de89df1ec453ff4adb9d77ffd596096cb44bd (patch) | |
tree | 7443b05ed3b99e4ef1ba6f2f9a9860450303b89e /tools | |
parent | 17229bdc86c9e618e8832b5ca8451e367e07511b (diff) | |
download | linux-stable-414de89df1ec453ff4adb9d77ffd596096cb44bd.tar.gz linux-stable-414de89df1ec453ff4adb9d77ffd596096cb44bd.tar.bz2 linux-stable-414de89df1ec453ff4adb9d77ffd596096cb44bd.zip |
KVM: arm64: selftests: Add light-weight spinlock support
Add a simpler version of spinlock support for ARM64 for
the guests to use.
The implementation is loosely based on the spinlock
implementation in kvm-unit-tests.
Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-12-rananta@google.com
Diffstat (limited to 'tools')
-rw-r--r-- | tools/testing/selftests/kvm/Makefile | 2 | ||||
-rw-r--r-- | tools/testing/selftests/kvm/include/aarch64/spinlock.h | 13 | ||||
-rw-r--r-- | tools/testing/selftests/kvm/lib/aarch64/spinlock.c | 27 |
3 files changed, 41 insertions, 1 deletions
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index d1774f461393..d8fb91a5ea7b 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -35,7 +35,7 @@ endif LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S -LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S +LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test diff --git a/tools/testing/selftests/kvm/include/aarch64/spinlock.h b/tools/testing/selftests/kvm/include/aarch64/spinlock.h new file mode 100644 index 000000000000..cf0984106d14 --- /dev/null +++ b/tools/testing/selftests/kvm/include/aarch64/spinlock.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef SELFTEST_KVM_ARM64_SPINLOCK_H +#define SELFTEST_KVM_ARM64_SPINLOCK_H + +struct spinlock { + int v; +}; + +extern void spin_lock(struct spinlock *lock); +extern void spin_unlock(struct spinlock *lock); + +#endif /* SELFTEST_KVM_ARM64_SPINLOCK_H */ diff --git a/tools/testing/selftests/kvm/lib/aarch64/spinlock.c b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c new file mode 100644 index 000000000000..a076e780be5d --- /dev/null +++ b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ARM64 Spinlock support + */ +#include <stdint.h> + +#include "spinlock.h" + +void spin_lock(struct spinlock *lock) +{ + int val, res; + + asm volatile( + "1: ldaxr %w0, [%2]\n" + " cbnz %w0, 1b\n" + " mov %w0, #1\n" + " stxr %w1, %w0, [%2]\n" + " cbnz %w1, 1b\n" + : "=&r" (val), "=&r" (res) + : "r" (&lock->v) + : "memory"); +} + +void spin_unlock(struct spinlock *lock) +{ + asm volatile("stlr wzr, [%0]\n" : : "r" (&lock->v) : "memory"); +} |