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Diffstat (limited to 'arch/x86/xen/enlighten.c')
-rw-r--r--arch/x86/xen/enlighten.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index bd3554934613..7250bef7f49e 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1095,6 +1095,8 @@ static void __init xen_setup_stackprotector(void)
/* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void)
{
+ struct physdev_set_iopl set_iopl;
+ int rc;
pgd_t *pgd;
if (!xen_start_info)
@@ -1209,10 +1211,18 @@ asmlinkage void __init xen_start_kernel(void)
#else
pv_info.kernel_rpl = 0;
#endif
-
/* set the limit of our address space */
xen_reserve_top();
+ /* We used to do this in xen_arch_setup, but that is too late on AMD
+ * were early_cpu_init (run before ->arch_setup()) calls early_amd_init
+ * which pokes 0xcf8 port.
+ */
+ set_iopl.iopl = 1;
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
+ if (rc != 0)
+ xen_raw_printk("physdev_op failed %d\n", rc);
+
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */
cpu_detect(&new_cpu_data);