linux-kernel - [PATCH v2 11/12] KVM: selftests / xen: don't explicitly set the vcpu

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Date:   Mon, 18 Sep 2023 11:21:47 +0000
From:   Paul Durrant <paul@....org>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Paul Durrant <pdurrant@...zon.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH v2 11/12] KVM: selftests / xen: don't explicitly set the vcpu_info address

From: Paul Durrant <pdurrant@...zon.com>

If the vCPU id is set and the shared_info is mapped using HVA then we can
infer that KVM has the ability to use a default vcpu_info mapping. Hence
we can stop setting the address of the vcpu_info structure.

Signed-off-by: Paul Durrant <pdurrant@...zon.com>
---
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: David Woodhouse <dwmw2@...radead.org>

v2:
 - New in this version.
---
 tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
index fa829d6e0848..d1c88deec0b2 100644
--- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
@@ -550,11 +550,13 @@ int main(int argc, char *argv[])
 		vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vid);
 	}
 
-	struct kvm_xen_vcpu_attr vi = {
-		.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO,
-		.u.gpa = VCPU_INFO_ADDR,
-	};
-	vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vi);
+	if (!has_vcpu_id || !has_shinfo_hva) {
+		struct kvm_xen_vcpu_attr vi = {
+			.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO,
+			.u.gpa = VCPU_INFO_ADDR,
+		};
+		vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vi);
+	}
 
 	struct kvm_xen_vcpu_attr pvclock = {
 		.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO,
-- 
2.39.2