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KVM: arm64: selftests: Add light-weight spinlock support

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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
This commit is contained in:
Raghavendra Rao Ananta 2021-10-07 23:34:35 +00:00 committed by Marc Zyngier
parent 17229bdc86
commit 414de89df1
3 changed files with 41 additions and 1 deletions
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2
tools/testing/selftests/kvm/Makefile
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@ -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

13
tools/testing/selftests/kvm/include/aarch64/spinlock.h Normal file
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@ -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 */

27
tools/testing/selftests/kvm/lib/aarch64/spinlock.c Normal file
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@ -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");
}