On Thu, Jun 06, 2013 at 12:38:10PM -0700, H. Peter Anvin wrote:
On 06/06/2013 12:36 PM, Borislav Petkov wrote:
On Thu, Jun 06, 2013 at 12:28:20PM -0700, H. Peter Anvin wrote:
Or we could materialize mappings for this specific PGD. However,
adding a read of %cr3 in __do_page_fault sounds
On 06/06/2013 08:58 AM, Borislav Petkov wrote:
--
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 654be4ae3047..7a6129afdff1 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1021,6 +1021,9 @@ __do_page_fault(struct pt_regs *regs, unsigned long
error_code)
On Thu, Jun 06, 2013 at 12:28:20PM -0700, H. Peter Anvin wrote:
Or we could materialize mappings for this specific PGD. However,
adding a read of %cr3 in __do_page_fault sounds expensive.
Yes, I think we want to make sure all mappings are there when we do an
EFI runtime call so that we never
From: Borislav Petkov b...@suse.de
Due to the braindead design of EFI, we cannot map runtime services more
than once for the duration of a booted system. Thus, if we want to use
EFI runtime services in a kexec'ed kernel, maybe the only possible and
sensible approach would be to map them 1:1 so
