[PATCH v3 09/12] x86/mpx: Map/unmap xsave area in in read_bndcfgu()

[Alejandro Vallejo <alejandro.vallejo@cloud.com>]

No functional change.

Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
---
v2->v3:
  * No change

v1->v2:
  * s/ret/bndcfgu
---
 xen/arch/x86/xstate.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
index 3d249518a1b7..2003ba664594 100644
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -1024,9 +1024,10 @@ int handle_xsetbv(u32 index, u64 new_bv)
 
 uint64_t read_bndcfgu(void)
 {
+    uint64_t bndcfgu = 0;
     unsigned long cr0 = read_cr0();
-    struct xsave_struct *xstate
-        = idle_vcpu[smp_processor_id()]->arch.xsave_area;
+    struct vcpu *v = idle_vcpu[smp_processor_id()];
+    struct xsave_struct *xstate = VCPU_MAP_XSAVE_AREA(v);
     const struct xstate_bndcsr *bndcsr;
 
     ASSERT(cpu_has_mpx);
@@ -1052,7 +1053,12 @@ uint64_t read_bndcfgu(void)
     if ( cr0 & X86_CR0_TS )
         write_cr0(cr0);
 
-    return xstate->xsave_hdr.xstate_bv & X86_XCR0_BNDCSR ? bndcsr->bndcfgu : 0;
+    if ( xstate->xsave_hdr.xstate_bv & X86_XCR0_BNDCSR )
+        bndcfgu = bndcsr->bndcfgu;
+
+    VCPU_UNMAP_XSAVE_AREA(v, xstate);
+
+    return bndcfgu;
 }
 
 void xstate_set_init(uint64_t mask)
-- 
2.47.1