xen/pvh: set CR4 flags for APs

During bootup in the 'probe_page_size_mask' these CR4 flags are
set in there. But for AP processors they are not set as we do not
use 'secondary_startup_64' which the baremetal kernels uses.
Instead do it in this function which we use in Xen PVH during our
startup for AP processors.

As such fix it up to make sure we have that flag set.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index a4d7b647867f..201d09a7c46b 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1473,6 +1473,18 @@ static void xen_pvh_set_cr_flags(int cpu)
          * X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests
          * (which PVH shared codepaths), while X86_CR0_PG is for PVH. */
         write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM);
+
+        if (!cpu)
+                return;
+        /*
+         * For BSP, PSE PGE are set in probe_page_size_mask(), for APs
+         * set them here. For all, OSFXSR OSXMMEXCPT are set in fpu_init.
+        */
+        if (cpu_has_pse)
+                set_in_cr4(X86_CR4_PSE);
+
+        if (cpu_has_pge)
+                set_in_cr4(X86_CR4_PGE);
 }
 
 /*