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x86/kaiser: Move feature detection up

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... before the first use of kaiser_enabled as otherwise funky
things happen:

  about to get started...
  (XEN) d0v0 Unhandled page fault fault/trap [#14, ec=0000]
  (XEN) Pagetable walk from ffff88022a449090:
  (XEN)  L4[0x110] = 0000000229e0e067 0000000000001e0e
  (XEN)  L3[0x008] = 0000000000000000 ffffffffffffffff
  (XEN) domain_crash_sync called from entry.S: fault at ffff82d08033fd08
  entry.o#create_bounce_frame+0x135/0x14d
  (XEN) Domain 0 (vcpu#0) crashed on cpu#0:
  (XEN) ----[ Xen-4.9.1_02-3.21  x86_64  debug=n   Not tainted ]----
  (XEN) CPU:    0
  (XEN) RIP:    e033:[<ffffffff81007460>]
  (XEN) RFLAGS: 0000000000000286   EM: 1   CONTEXT: pv guest (d0v0)

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov 2017-12-25 13:57:16 +01:00 committed by Greg Kroah-Hartman
parent 402e63de94
commit 59094faf3f
3 changed files with 9 additions and 2 deletions
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2
arch/x86/include/asm/kaiser.h
View File

@ -96,8 +96,10 @@ DECLARE_PER_CPU(unsigned long, x86_cr3_pcid_user);
extern char __per_cpu_user_mapped_start[], __per_cpu_user_mapped_end[];
extern int kaiser_enabled;
extern void __init kaiser_check_boottime_disable(void);
#else
#define kaiser_enabled 0
static inline void __init kaiser_check_boottime_disable(void) {}
#endif /* CONFIG_KAISER */
/*

7
arch/x86/kernel/setup.c
View File

@ -114,6 +114,7 @@
#include <asm/microcode.h>
#include <asm/mmu_context.h>
#include <asm/kaslr.h>
#include <asm/kaiser.h>
/*
* max_low_pfn_mapped: highest direct mapped pfn under 4GB
@ -1019,6 +1020,12 @@ void __init setup_arch(char **cmdline_p)
*/
init_hypervisor_platform();
/*
* This needs to happen right after XENPV is set on xen and
* kaiser_enabled is checked below in cleanup_highmap().
*/
kaiser_check_boottime_disable();
x86_init.resources.probe_roms();
/* after parse_early_param, so could debug it */

2
arch/x86/mm/kaiser.c
View File

@ -310,8 +310,6 @@ void __init kaiser_init(void)
{
int cpu;
kaiser_check_boottime_disable();
if (!kaiser_enabled)
return;