These are reads of registers which have already been set up, so are safe to do
at any point. However, TLB flushes (e.g. from bootstrap_map()) don't function
until get_cpu_info()->cr4 is populated.
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
---
CC: Jan Beulich <jbeul...@suse.com>
---
xen/arch/x86/setup.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 32bb02e..2b4b48c 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -676,6 +676,9 @@ void __init noreturn __start_xen(unsigned long mbi_p)
smp_prepare_boot_cpu();
sort_exception_tables();
+ rdmsrl(MSR_EFER, this_cpu(efer));
+ asm volatile ( "mov %%cr4, %0" : "=r" (get_cpu_info()->cr4) );
+
setup_virtual_regions(__start___ex_table, __stop___ex_table);
/* Full exception support from here on in. */
@@ -706,9 +709,6 @@ void __init noreturn __start_xen(unsigned long mbi_p)
parse_video_info();
- rdmsrl(MSR_EFER, this_cpu(efer));
- asm volatile ( "mov %%cr4,%0" : "=r" (get_cpu_info()->cr4) );
-
/* We initialise the serial devices very early so we can get debugging. */
ns16550.io_base = 0x3f8;
ns16550.irq = 4;
--
2.1.4
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
