[v2,13/13] x86/xstate: Make xstate_all() and vcpu_xsave_mask() take explicit xstate

Commit Message

Alejandro Vallejo Nov. 5, 2024, 2:33 p.m. UTC

No functional change.

Signed-off-by: Alejandro Vallejo <[e-mail]>
---
 xen/arch/x86/i387.c               | 9 +++++----
 xen/arch/x86/include/asm/xstate.h | 5 +++--
 xen/arch/x86/xstate.c             | 2 +-
 3 files changed, 9 insertions(+), 7 deletions(-)

Patch

diff --git a/xen/arch/x86/i387.c b/xen/arch/x86/i387.c
index c794367a3cc7..36a6c8918162 100644
--- a/xen/arch/x86/i387.c
+++ b/xen/arch/x86/i387.c
@@ -107,7 +107,8 @@  static inline void fpu_fxrstor(struct vcpu *v, const fpusse_t *fpu_ctxt)
 /*      FPU Save Functions     */
 /*******************************/
 
-static inline uint64_t vcpu_xsave_mask(const struct vcpu *v)
+static inline uint64_t vcpu_xsave_mask(const struct vcpu *v,
+                                       const struct xsave_struct *xsave_area)
 {
     if ( v->fpu_dirtied )
         return v->arch.nonlazy_xstate_used ? XSTATE_ALL : XSTATE_LAZY;
@@ -124,14 +125,14 @@  static inline uint64_t vcpu_xsave_mask(const struct vcpu *v)
      * XSTATE_FP_SSE), vcpu_xsave_mask will return XSTATE_ALL. Otherwise
      * return XSTATE_NONLAZY.
      */
-    return xstate_all(v) ? XSTATE_ALL : XSTATE_NONLAZY;
+    return xstate_all(v, xsave_area) ? XSTATE_ALL : XSTATE_NONLAZY;
 }
 
 /* Save x87 extended state */
 static inline void fpu_xsave(const struct vcpu *v, struct xsave_struct *xsave_area)
 {
     bool ok;
-    uint64_t mask = vcpu_xsave_mask(v);
+    uint64_t mask = vcpu_xsave_mask(v, xsave_area);
 
     ASSERT(mask);
     /*
@@ -211,7 +212,7 @@  void vcpu_restore_fpu_nonlazy(struct vcpu *v, bool need_stts)
      * saving state belonging to another vCPU.
      */
     xsave_area = VCPU_MAP_XSAVE_AREA(v);
-    if ( v->arch.fully_eager_fpu || xstate_all(v) )
+    if ( v->arch.fully_eager_fpu || xstate_all(v, xsave_area) )
     {
         if ( cpu_has_xsave )
             fpu_xrstor(v, xsave_area, XSTATE_ALL);
diff --git a/xen/arch/x86/include/asm/xstate.h b/xen/arch/x86/include/asm/xstate.h
index d2ef4c0b25f0..e3e9c18239ed 100644
--- a/xen/arch/x86/include/asm/xstate.h
+++ b/xen/arch/x86/include/asm/xstate.h
@@ -132,14 +132,15 @@  xsave_area_compressed(const struct xsave_struct *xsave_area)
     return xsave_area->xsave_hdr.xcomp_bv & XSTATE_COMPACTION_ENABLED;
 }
 
-static inline bool xstate_all(const struct vcpu *v)
+static inline bool xstate_all(const struct vcpu *v,
+                              const struct xsave_struct *xsave_area)
 {
     /*
      * XSTATE_FP_SSE may be excluded, because the offsets of XSTATE_FP_SSE
      * (in the legacy region of xsave area) are fixed, so saving
      * XSTATE_FP_SSE will not cause overwriting problem with XSAVES/XSAVEC.
      */
-    return xsave_area_compressed(v->arch.xsave_area) &&
+    return xsave_area_compressed(xsave_area) &&
            (v->arch.xcr0_accum & XSTATE_LAZY & ~XSTATE_FP_SSE);
 }
 
diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
index b5e8d90ef600..26e460adfd79 100644
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -1003,7 +1003,7 @@  int handle_xsetbv(u32 index, u64 new_bv)
             asm ( "stmxcsr %0" : "=m" (xsave_area->fpu_sse.mxcsr) );
             VCPU_UNMAP_XSAVE_AREA(curr, xsave_area);
         }
-        else if ( xstate_all(curr) )
+        else if ( xstate_all(curr, xsave_area) )
         {
             /* See the comment in i387.c:vcpu_restore_fpu_eager(). */
             mask |= XSTATE_LAZY;