[PATCH v4 10/13] KVM: selftests / xen: set KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID

[Paul Durrant <paul@xen.org>]

From: Paul Durrant <pdurrant@amazon.com>

If the capability (KVM_XEN_HVM_CONFIG_EVTCHN_SEND) is present then set
the guest's vCPU id to match the chosen vcpu_info offset.

Also make some cosmetic fixes to the code for clarity.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
---
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>

v3:
 - Remame VCPU_ID to XEN_VCPU_ID.
 - Set vcpu_id before the shared_info page is set.

v2:
 - New in this version.
---
 .../selftests/kvm/x86_64/xen_shinfo_test.c    | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 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 05898ad9f4d9..b0c3a00ea6a6 100644
--- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
@@ -38,6 +38,8 @@
 #define VCPU_INFO_VADDR	(SHINFO_REGION_GVA + 0x40)
 #define RUNSTATE_VADDR	(SHINFO_REGION_GVA + PAGE_SIZE + PAGE_SIZE - 15)
 
+#define XEN_VCPU_ID	1 /* Must correspond to offset of VCPU_INFO_[V]ADDR */
+
 #define EVTCHN_VECTOR	0x10
 
 #define EVTCHN_TEST1 15
@@ -410,7 +412,7 @@ static void *juggle_shinfo_state(void *arg)
 
 	struct kvm_xen_hvm_attr cache_activate = {
 		.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
-		.u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE
+		.u.shared_info.gfn = SHINFO_ADDR / PAGE_SIZE
 	};
 
 	struct kvm_xen_hvm_attr cache_deactivate = {
@@ -446,6 +448,7 @@ int main(int argc, char *argv[])
 	bool do_runstate_flag = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG);
 	bool do_eventfd_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL);
 	bool do_evtchn_tests = do_eventfd_tests && !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND);
+	bool has_vcpu_id = !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND);
 
 	clock_gettime(CLOCK_REALTIME, &min_ts);
 
@@ -492,9 +495,17 @@ int main(int argc, char *argv[])
 			    "Failed to read back RUNSTATE_UPDATE_FLAG attr");
 	}
 
+	if (has_vcpu_id) {
+		struct kvm_xen_vcpu_attr vid = {
+			.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID,
+			.u.vcpu_id = XEN_VCPU_ID,
+		};
+		vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &vid);
+	}
+
 	struct kvm_xen_hvm_attr ha = {
 		.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
-		.u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE,
+		.u.shared_info.gfn = SHINFO_ADDR / PAGE_SIZE,
 	};
 	vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ha);
 
@@ -983,8 +994,8 @@ int main(int argc, char *argv[])
 	struct pvclock_wall_clock *wc;
 	struct pvclock_vcpu_time_info *ti, *ti2;
 
-	wc = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0xc00);
-	ti = addr_gpa2hva(vm, SHINFO_REGION_GPA + 0x40 + 0x20);
+	wc = addr_gpa2hva(vm, SHINFO_ADDR + 0xc00);
+	ti = addr_gpa2hva(vm, VCPU_INFO_ADDR + 0x20);
 	ti2 = addr_gpa2hva(vm, PVTIME_ADDR);
 
 	if (verbose) {
-- 
2.39.2