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From: Raghavendra Rao Ananta <rananta@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Marc Zyngier <maz@kernel.org>, Andrew Jones <drjones@redhat.com>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Peter Shier <pshier@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Oliver Upton <oupton@google.com>,
	Reiji Watanabe <reijiw@google.com>,
	Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Subject: [PATCH v4 05/18] KVM: arm64: selftests: Add support for cpu_relax
Date: Thu,  9 Sep 2021 01:38:05 +0000	[thread overview]
Message-ID: <20210909013818.1191270-6-rananta@google.com> (raw)
In-Reply-To: <20210909013818.1191270-1-rananta@google.com>

Implement the guest helper routine, cpu_relax(), to yield
the processor to other tasks.

The function was derived from
arch/arm64/include/asm/vdso/processor.h.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
---
 tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index ac8b63f8aab7..166d273ad715 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -134,6 +134,11 @@ void vm_install_exception_handler(struct kvm_vm *vm,
 void vm_install_sync_handler(struct kvm_vm *vm,
 		int vector, int ec, handler_fn handler);
 
+static inline void cpu_relax(void)
+{
+	asm volatile("yield" ::: "memory");
+}
+
 #define isb()		asm volatile("isb" : : : "memory")
 #define dsb(opt)	asm volatile("dsb " #opt : : : "memory")
 #define dmb(opt)	asm volatile("dmb " #opt : : : "memory")
-- 
2.33.0.153.gba50c8fa24-goog


  parent reply	other threads:[~2021-09-09  1:38 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09  1:38 [PATCH v4 00/18] KVM: arm64: selftests: Introduce arch_timer selftest Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 01/18] KVM: arm64: selftests: Add MMIO readl/writel support Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 02/18] KVM: arm64: selftests: Add sysreg.h Raghavendra Rao Ananta
2021-09-09  2:47   ` Oliver Upton
2021-09-09  6:53     ` Andrew Jones
2021-09-09 16:42       ` Raghavendra Rao Ananta
2021-09-09 17:17   ` Mark Brown
2021-09-09 20:06     ` Raghavendra Rao Ananta
2021-09-10  8:30       ` Mark Brown
2021-09-13 23:38         ` Raghavendra Rao Ananta
2021-09-14 10:39           ` Mark Brown
2021-09-09  1:38 ` [PATCH v4 03/18] KVM: arm64: selftests: Use read/write definitions from sysreg.h Raghavendra Rao Ananta
2021-09-09  2:55   ` Oliver Upton
2021-09-09  6:56   ` Andrew Jones
2021-09-09 16:43     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 04/18] KVM: arm64: selftests: Introduce ARM64_SYS_KVM_REG Raghavendra Rao Ananta
2021-09-09  3:02   ` Oliver Upton
2021-09-09 16:48     ` Raghavendra Rao Ananta
2021-09-09  7:04   ` Andrew Jones
2021-09-09 16:49     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` Raghavendra Rao Ananta [this message]
2021-09-09  1:38 ` [PATCH v4 06/18] KVM: arm64: selftests: Add basic support for arch_timers Raghavendra Rao Ananta
2021-09-09  7:07   ` Andrew Jones
2021-09-09  1:38 ` [PATCH v4 07/18] KVM: arm64: selftests: Add basic support to generate delays Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 08/18] KVM: arm64: selftests: Add support to disable and enable local IRQs Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 09/18] KVM: arm64: selftests: Add guest support to get the vcpuid Raghavendra Rao Ananta
2021-09-09  5:09   ` Oliver Upton
2021-09-09 16:59     ` Raghavendra Rao Ananta
2021-09-09 17:04       ` Oliver Upton
2021-09-09  7:56   ` Andrew Jones
2021-09-09 17:10     ` Raghavendra Rao Ananta
2021-09-10  8:10       ` Andrew Jones
2021-09-10 18:03         ` Raghavendra Rao Ananta
2021-09-13  7:25           ` Andrew Jones
2021-09-12  7:05   ` Reiji Watanabe
2021-09-13  7:35     ` Andrew Jones
2021-09-13 16:51       ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 10/18] KVM: arm64: selftests: Add light-weight spinlock support Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 11/18] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-09-09  5:18   ` Oliver Upton
2021-09-09 16:38     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 12/18] KVM: selftests: Keep track of the number of vCPUs for a VM Raghavendra Rao Ananta
2021-09-09  5:22   ` Oliver Upton
2021-09-09 13:20   ` Andrew Jones
2021-09-09  1:38 ` [PATCH v4 13/18] KVM: selftests: Add support to get the VM's mode Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 14/18] KVM: arm64: selftests: Add host support for vGIC Raghavendra Rao Ananta
2021-09-09  5:32   ` Oliver Upton
2021-09-09 13:34     ` Andrew Jones
2021-09-09 17:25       ` Raghavendra Rao Ananta
2021-09-09 17:20     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 15/18] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-09-09  5:51   ` Oliver Upton
2021-09-09 18:03     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 16/18] KVM: arm64: selftests: arch_timer: Support vCPU migration Raghavendra Rao Ananta
2021-09-09 13:45   ` Andrew Jones
2021-09-09 17:33     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 17/18] KVM: arm64: selftests: Replace ARM64_SYS_REG with ARM64_SYS_KVM_REG Raghavendra Rao Ananta
2021-09-09  5:34   ` Oliver Upton
2021-09-09 13:38   ` Andrew Jones
2021-09-09 17:29     ` Raghavendra Rao Ananta
2021-09-09  1:38 ` [PATCH v4 18/18] KVM: selftests: vgic_init: Pull REDIST_REGION_ATTR_ADDR from vgic.h Raghavendra Rao Ananta
2021-09-09  5:36   ` Oliver Upton
2021-09-09 16:41     ` Raghavendra Rao Ananta

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