diff -r 7b8c65af9f8b sys/src/9/pc/devarch.c
--- a/sys/src/9/pc/devarch.c	Fri Jun 19 20:19:57 2020 +0200
+++ b/sys/src/9/pc/devarch.c	Sat Jun 27 19:45:05 2020 -0700
@@ -42,6 +42,7 @@
 enum {
 	CR4Osfxsr = 1 << 9,
 	CR4Oxmmex = 1 << 10,
+	CR40osxsave = 1 << 18,
 };
 
 enum {				/* cpuid standard function codes */
@@ -897,7 +898,8 @@
 	if((m->cpuiddx & (Sse|Fxsr)) == (Sse|Fxsr)){			/* have sse fp? */
 		fpsave = fpssesave;
 		fprestore = fpsserestore;
-		putcr4(getcr4() | CR4Osfxsr|CR4Oxmmex);
+		print("---- FIXME: haced xsave ----\n");
+		putcr4(getcr4() | CR4Osfxsr|CR4Oxmmex|CR40osxsave);
 	} else {
 		fpsave = fpx87save;
 		fprestore = fpx87restore;