[Xen-devel] [PATCH v3 4/5] x86/hyperv: retrieve vp_index from Hyper-V

[Wei Liu <wl@xen.org>]

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

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
v2:
1. Fold into setup_pcpu_arg function
---
 xen/arch/x86/guest/hyperv/hyperv.c | 5 +++++
 xen/include/asm-x86/guest/hyperv.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/xen/arch/x86/guest/hyperv/hyperv.c b/xen/arch/x86/guest/hyperv/hyperv.c
index 7e046dfc04..e5f258c946 100644
--- a/xen/arch/x86/guest/hyperv/hyperv.c
+++ b/xen/arch/x86/guest/hyperv/hyperv.c
@@ -28,6 +28,7 @@ struct ms_hyperv_info __read_mostly ms_hyperv;
 
 extern char hv_hypercall_page[];
 DEFINE_PER_CPU_READ_MOSTLY(void *, 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)
@@ -87,6 +88,7 @@ static void __init setup_hypercall_page(void)
 static void setup_hypercall_pcpu_arg(void)
 {
     void *mapping;
+    uint64_t vp_index_msr;
 
     mapping = alloc_xenheap_page();
     if ( !mapping )
@@ -94,6 +96,9 @@ static void setup_hypercall_pcpu_arg(void)
               smp_processor_id());
 
     this_cpu(hv_pcpu_input_arg) = mapping;
+
+    rdmsrl(HV_X64_MSR_VP_INDEX, vp_index_msr);
+    this_cpu(hv_vp_index) = vp_index_msr;
 }
 
 static void __init setup(void)
diff --git a/xen/include/asm-x86/guest/hyperv.h b/xen/include/asm-x86/guest/hyperv.h
index 6cf2eab62f..bae06c8a3a 100644
--- a/xen/include/asm-x86/guest/hyperv.h
+++ b/xen/include/asm-x86/guest/hyperv.h
@@ -66,6 +66,7 @@ struct ms_hyperv_info {
 extern struct ms_hyperv_info ms_hyperv;
 
 DECLARE_PER_CPU(void *, 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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