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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next prev parent reply other threads:[~2021-08-18 20:00 UTC|newest]
Thread overview: 13+ 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 ` [PATCH v2 01/10] KVM: arm64: selftests: Add MMIO readl/writel support 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 ` [PATCH v2 03/10] KVM: arm64: selftests: Add support for cpu_relax 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 ` [PATCH v2 05/10] KVM: arm64: selftests: Add basic support to generate delays 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 [this message]
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 ` [PATCH v2 09/10] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-08-18 18:43 ` [PATCH v2 10/10] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-08-26 21:54 ` Ricardo Koller
2021-08-27 16:36 ` Raghavendra Rao Ananta
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