diff mbox series

[04/14] x86/fpu: Map/umap xsave area in vcpu_{reset,setup}_fpu()

Message ID 20241028154932.6797-5-alejandro.vallejo@cloud.com (mailing list archive)
State New
Headers show
Series x86: Address Space Isolation FPU preparations | expand

Commit Message

Alejandro Vallejo Oct. 28, 2024, 3:49 p.m. UTC 
No functional change.

Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
---
 xen/arch/x86/i387.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/xen/arch/x86/i387.c b/xen/arch/x86/i387.c
index 375a8274f632..a571bcb23c91 100644
--- a/xen/arch/x86/i387.c
+++ b/xen/arch/x86/i387.c
@@ -306,8 +306,10 @@  int vcpu_init_fpu(struct vcpu *v)
 
 void vcpu_reset_fpu(struct vcpu *v)
 {
+    struct xsave_struct *xsave_area = vcpu_map_xsave_area(v);
+
     v->fpu_initialised = false;
-    *v->arch.xsave_area = (struct xsave_struct) {
+    *xsave_area = (struct xsave_struct) {
         .fpu_sse = {
             .mxcsr = MXCSR_DEFAULT,
             .fcw = FCW_RESET,
@@ -315,15 +317,21 @@  void vcpu_reset_fpu(struct vcpu *v)
         },
         .xsave_hdr.xstate_bv = X86_XCR0_X87,
     };
+
+    vcpu_unmap_xsave_area(v, xsave_area);
 }
 
 void vcpu_setup_fpu(struct vcpu *v, const void *data)
 {
+    struct xsave_struct *xsave_area = vcpu_map_xsave_area(v);
+
     v->fpu_initialised = true;
-    *v->arch.xsave_area = (struct xsave_struct) {
+    *xsave_area = (struct xsave_struct) {
         .fpu_sse = *(const fpusse_t*)data,
         .xsave_hdr.xstate_bv = XSTATE_FP_SSE,
     };
+
+    vcpu_unmap_xsave_area(v, xsave_area);
 }
 
 /* Free FPU's context save area */