linux-kernel - [PATCH v5 10/12] KVM: riscv: selftests: Add guest helper to get vcpu id

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Date: Mon, 22 Jan 2024 17:58:40 +0800
From: Haibo Xu <haibo1.xu@...el.com>
To: 
Cc: xiaobo55x@...il.com,
	ajones@...tanamicro.com,
	Haibo Xu <haibo1.xu@...el.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	Guo Ren <guoren@...nel.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Mayuresh Chitale <mchitale@...tanamicro.com>,
	Daniel Henrique Barboza <dbarboza@...tanamicro.com>,
	wchen <waylingii@...il.com>,
	Minda Chen <minda.chen@...rfivetech.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Samuel Holland <samuel@...lland.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Peter Xu <peterx@...hat.com>,
	Like Xu <likexu@...cent.com>,
	Vipin Sharma <vipinsh@...gle.com>,
	Aaron Lewis <aaronlewis@...gle.com>,
	Thomas Huth <thuth@...hat.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	kvm-riscv@...ts.infradead.org
Subject: [PATCH v5 10/12] KVM: riscv: selftests: Add guest helper to get vcpu id

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@...el.com>
Reviewed-by: Andrew Jones <ajones@...tanamicro.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 c42d683102c7..16ae0ac01879 100644
--- a/tools/testing/selftests/kvm/include/aarch64/processor.h
+++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
@@ -226,8 +226,4 @@ 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