x86/xen: Initialize cr4 shadow for 64-bit PV(H) guests

Boris Ostrovsky · David Vrabel · commit 5054daa285be · 2015-02-23T16:30:26.000Z
Commit 1e02ce4 ("x86: Store a per-cpu shadow copy of CR4") introduced CR4 shadows. These shadows are initialized in early boot code. The commit missed initialization for 64-bit PV(H) guests that this patch adds. Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
@@ -1758,6 +1758,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
 #ifdef CONFIG_X86_32
 	i386_start_kernel();
 #else
+	cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
 	x86_64_start_reservations((char *)__pa_symbol(&boot_params));
 #endif
 }

Original file line number	Diff line number	Diff line change
`@@ -1758,6 +1758,7 @@ asmlinkage __visible void __init xen_start_kernel(void)`
`1758`	`1758`	`#ifdef CONFIG_X86_32`
`1759`	`1759`	`i386_start_kernel();`
`1760`	`1760`	`#else`
	`1761`	`+ cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */`
`1761`	`1762`	`x86_64_start_reservations((char *)__pa_symbol(&boot_params));`
`1762`	`1763`	`#endif`
`1763`	`1764`	`}`