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From: Raghavendra Rao Ananta <rananta@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>
Cc: kvm@vger.kernel.org, Peter Shier <pshier@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	kvmarm@lists.cs.columbia.edu
Subject: [PATCH v2 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1
Date: Wed, 18 Aug 2021 18:43:08 +0000	[thread overview]
Message-ID: <20210818184311.517295-8-rananta@google.com> (raw)
In-Reply-To: <20210818184311.517295-1-rananta@google.com>

At times, such as when in the interrupt handler, the guest wants to
get the vCPU-id that it's running on. As a result, introduce
get_vcpuid() that parses the MPIDR_EL1 and returns the vcpuid to the
requested caller.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index ae7a079ae180..e9342e63d05d 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -248,4 +248,23 @@ static inline void local_irq_disable(void)
 	asm volatile("msr daifset, #3" : : : "memory");
 }
 
+#define MPIDR_LEVEL_BITS 8
+#define MPIDR_LEVEL_SHIFT(level) (MPIDR_LEVEL_BITS * level)
+#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
+#define MPIDR_AFFINITY_LEVEL(mpidr, level) \
+	((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
+
+static inline uint32_t get_vcpuid(void)
+{
+	uint32_t vcpuid = 0;
+	uint64_t mpidr = read_sysreg(mpidr_el1);
+
+	/* KVM limits only 16 vCPUs at level 0 */
+	vcpuid = mpidr & 0x0f;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 1) << 4;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 2) << 12;
+
+	return vcpuid;
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog

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WARNING: multiple messages have this Message-ID (diff)
From: Raghavendra Rao Ananta <rananta@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	James Morse <james.morse@arm.com>,
	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>,
	kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Subject: [PATCH v2 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1
Date: Wed, 18 Aug 2021 18:43:08 +0000	[thread overview]
Message-ID: <20210818184311.517295-8-rananta@google.com> (raw)
In-Reply-To: <20210818184311.517295-1-rananta@google.com>

At times, such as when in the interrupt handler, the guest wants to
get the vCPU-id that it's running on. As a result, introduce
get_vcpuid() that parses the MPIDR_EL1 and returns the vcpuid to the
requested caller.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
 .../selftests/kvm/include/aarch64/processor.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index ae7a079ae180..e9342e63d05d 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -248,4 +248,23 @@ static inline void local_irq_disable(void)
 	asm volatile("msr daifset, #3" : : : "memory");
 }
 
+#define MPIDR_LEVEL_BITS 8
+#define MPIDR_LEVEL_SHIFT(level) (MPIDR_LEVEL_BITS * level)
+#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
+#define MPIDR_AFFINITY_LEVEL(mpidr, level) \
+	((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
+
+static inline uint32_t get_vcpuid(void)
+{
+	uint32_t vcpuid = 0;
+	uint64_t mpidr = read_sysreg(mpidr_el1);
+
+	/* KVM limits only 16 vCPUs at level 0 */
+	vcpuid = mpidr & 0x0f;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 1) << 4;
+	vcpuid |= MPIDR_AFFINITY_LEVEL(mpidr, 2) << 12;
+
+	return vcpuid;
+}
+
 #endif /* SELFTEST_KVM_PROCESSOR_H */
-- 
2.33.0.rc1.237.g0d66db33f3-goog


  parent reply	other threads:[~2021-08-18 20:00 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 18:43 [PATCH v2 00/10] KVM: arm64: selftests: Introduce arch_timer selftest Raghavendra Rao Ananta
2021-08-18 18:43 ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 01/10] KVM: arm64: selftests: Add MMIO readl/writel support Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 02/10] KVM: arm64: selftests: Add write_sysreg_s and read_sysreg_s Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 03/10] KVM: arm64: selftests: Add support for cpu_relax Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 04/10] KVM: arm64: selftests: Add basic support for arch_timers Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 05/10] KVM: arm64: selftests: Add basic support to generate delays Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 06/10] KVM: arm64: selftests: Add support to disable and enable local IRQs Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` Raghavendra Rao Ananta [this message]
2021-08-18 18:43   ` [PATCH v2 07/10] KVM: arm64: selftests: Add support to get the vcpuid from MPIDR_EL1 Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 08/10] KVM: arm64: selftests: Add light-weight spinlock support Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 09/10] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 10/10] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-08-18 18:43   ` Raghavendra Rao Ananta
2021-08-26 21:54   ` Ricardo Koller
2021-08-26 21:54     ` Ricardo Koller
2021-08-27 16:36     ` Raghavendra Rao Ananta
2021-08-27 16:36       ` Raghavendra Rao Ananta

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