[Xen-devel] [PATCH 7/8] x86/hyperv: retrieve vp_index from Hyper-V

[Wei Liu <wl@xxxxxxx>]

This will be useful when invoking hypercall that targets specific
vcpu(s).

Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
---
 xen/arch/x86/guest/hyperv/hyperv.c | 12 ++++++++++++
 xen/include/asm-x86/guest/hyperv.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/xen/arch/x86/guest/hyperv/hyperv.c 
b/xen/arch/x86/guest/hyperv/hyperv.c
index 67667936e9..da3a8cd85d 100644
--- a/xen/arch/x86/guest/hyperv/hyperv.c
+++ b/xen/arch/x86/guest/hyperv/hyperv.c
@@ -29,6 +29,7 @@ struct ms_hyperv_info __read_mostly ms_hyperv;
 void *hv_hypercall;
 static struct page_info *hv_hypercall_page;
 DEFINE_PER_CPU_READ_MOSTLY(struct hyperv_pcpu_page, hv_pcpu_input_arg);
+DEFINE_PER_CPU_READ_MOSTLY(unsigned int, hv_vp_index);
 
 static const struct hypervisor_ops ops;
 const struct hypervisor_ops *__init hyperv_probe(void)
@@ -115,15 +116,26 @@ static void setup_hypercall_pcpu_arg(void)
     this_cpu(hv_pcpu_input_arg).mapping = mapping;
 }
 
+static void setup_vp_index(void)
+{
+    uint64_t vp_index_msr;
+
+    rdmsrl(HV_X64_MSR_VP_INDEX, vp_index_msr);
+
+    this_cpu(hv_vp_index) = vp_index_msr;
+}
+
 static void __init setup(void)
 {
     setup_hypercall_page();
     setup_hypercall_pcpu_arg();
+    setup_vp_index();
 }
 
 static void ap_setup(void)
 {
     setup_hypercall_pcpu_arg();
+    setup_vp_index();
 }
 
 static const struct hypervisor_ops ops = {
diff --git a/xen/include/asm-x86/guest/hyperv.h 
b/xen/include/asm-x86/guest/hyperv.h
index 83f297468f..4b635829f3 100644
--- a/xen/include/asm-x86/guest/hyperv.h
+++ b/xen/include/asm-x86/guest/hyperv.h
@@ -70,6 +70,7 @@ struct hyperv_pcpu_page {
     void *mapping;
 };
 DECLARE_PER_CPU(struct hyperv_pcpu_page, hv_pcpu_input_arg);
+DECLARE_PER_CPU(unsigned int, hv_vp_index);
 
 const struct hypervisor_ops *hyperv_probe(void);
 
-- 
2.20.1


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