[PATCH v3 7/9] KVM: riscv: selftests: Add guest helper to get vcpu id

From: Haibo Xu <haibo1.xu@intel.com>
To: unlisted-recipients:; (no To-header on input)
Cc: xiaobo55x@gmail.com, haibo1.xu@intel.com,
	ajones@ventanamicro.com, Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Shuah Khan <shuah@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Anup Patel <anup@brainfault.org>,
	Atish Patra <atishp@atishpatra.org>,
	Sean Christopherson <seanjc@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Vishal Annapurve <vannapurve@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Vipin Sharma <vipinsh@google.com>,
	David Matlack <dmatlack@google.com>,
	Colton Lewis <coltonlewis@google.com>,
	Aaron Lewis <aaronlewis@google.com>,
	Thomas Huth <thuth@redhat.com>,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
	kvm@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	kvm-riscv@lists.infradead.org
Subject: [PATCH v3 7/9] KVM: riscv: selftests: Add guest helper to get vcpu id
Date: Thu, 14 Sep 2023 09:37:01 +0800	[thread overview]
Message-ID: <17c19d6ec28bcde8f3a2d169501a700635c0c332.1694421911.git.haibo1.xu@intel.com> (raw)
In-Reply-To: <cover.1694421911.git.haibo1.xu@intel.com>

Add guest_get_vcpuid() helper to simplify accessing to per-cpu
private data. The sscratch CSR was used to store the vcpu id.

Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
 tools/testing/selftests/kvm/include/aarch64/processor.h | 4 ----
 tools/testing/selftests/kvm/include/kvm_util_base.h     | 2 ++
 tools/testing/selftests/kvm/lib/riscv/processor.c       | 8 ++++++++
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
index 69e7b08d3f99..f41fcd63624f 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -219,8 +219,4 @@ void smccc_smc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
 	       uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5,
 	       uint64_t arg6, struct arm_smccc_res *res);
 
-
-
-uint32_t guest_get_vcpuid(void);
-
 #endif /* SELFTEST_KVM_PROCESSOR_H */
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 135ae2eb5249..666438113d22 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -939,4 +939,6 @@ struct ex_regs;
 typedef void(*exception_handler_fn)(struct ex_regs *);
 void vm_install_exception_handler(struct kvm_vm *vm, int vector, exception_handler_fn handler);
 
+uint32_t guest_get_vcpuid(void);
+
 #endif /* SELFTEST_KVM_UTIL_BASE_H */
diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
index efd9ac4b0198..39a1e9902dec 100644
--- a/tools/testing/selftests/kvm/lib/riscv/processor.c
+++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
@@ -316,6 +316,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
 	vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.sp), stack_vaddr + stack_size);
 	vcpu_set_reg(vcpu, RISCV_CORE_REG(regs.pc), (unsigned long)guest_code);
 
+	/* Setup sscratch for guest_get_vcpuid() */
+	vcpu_set_reg(vcpu, RISCV_CSR_REG(sscratch), vcpu_id);
+
 	/* Setup default exception vector of guest */
 	vcpu_set_reg(vcpu, RISCV_CSR_REG(stvec), (unsigned long)guest_unexp_trap);
 
@@ -436,3 +439,8 @@ void vm_install_interrupt_handler(struct kvm_vm *vm, exception_handler_fn handle
 
 	handlers->exception_handlers[1][0] = handler;
 }
+
+uint32_t guest_get_vcpuid(void)
+{
+	return csr_read(CSR_SSCRATCH);
+}
-- 
2.34.1

