linux-kernel - [PATCH v4 1/9] KVM: selftests: Add vcpu_set_cpuid

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Date:   Mon, 11 Sep 2023 19:43:39 +0800
From:   Jinrong Liang <ljr.kernel@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Like Xu <likexu@...cent.com>,
        David Matlack <dmatlack@...gle.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jinrong Liang <cloudliang@...cent.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/9] KVM: selftests: Add vcpu_set_cpuid_property() to set properties

From: Jinrong Liang <cloudliang@...cent.com>

Add vcpu_set_cpuid_property() helper function for setting properties,
which simplifies the process of setting CPUID properties for vCPUs.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
---
 .../selftests/kvm/include/x86_64/processor.h       |  4 ++++
 tools/testing/selftests/kvm/lib/x86_64/processor.c | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 4fd042112526..6b146e1c6736 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -973,6 +973,10 @@ static inline void vcpu_set_cpuid(struct kvm_vcpu *vcpu)
 
 void vcpu_set_cpuid_maxphyaddr(struct kvm_vcpu *vcpu, uint8_t maxphyaddr);
 
+void vcpu_set_cpuid_property(struct kvm_vcpu *vcpu,
+			     struct kvm_x86_cpu_property property,
+			     uint32_t value);
+
 void vcpu_clear_cpuid_entry(struct kvm_vcpu *vcpu, uint32_t function);
 void vcpu_set_or_clear_cpuid_feature(struct kvm_vcpu *vcpu,
 				     struct kvm_x86_cpu_feature feature,
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index d8288374078e..0e029be66783 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -760,6 +760,20 @@ void vcpu_set_cpuid_maxphyaddr(struct kvm_vcpu *vcpu, uint8_t maxphyaddr)
 	vcpu_set_cpuid(vcpu);
 }
 
+void vcpu_set_cpuid_property(struct kvm_vcpu *vcpu,
+			     struct kvm_x86_cpu_property property,
+			     uint32_t value)
+{
+	struct kvm_cpuid_entry2 *entry;
+
+	entry = __vcpu_get_cpuid_entry(vcpu, property.function, property.index);
+
+	(&entry->eax)[property.reg] &= ~GENMASK(property.hi_bit, property.lo_bit);
+	(&entry->eax)[property.reg] |= value << (property.lo_bit);
+
+	vcpu_set_cpuid(vcpu);
+}
+
 void vcpu_clear_cpuid_entry(struct kvm_vcpu *vcpu, uint32_t function)
 {
 	struct kvm_cpuid_entry2 *entry = vcpu_get_cpuid_entry(vcpu, function);
-- 
2.39.3