* [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests
@ 2018-07-02 10:00 Juergen Gross
2018-07-10 22:27 ` Boris Ostrovsky
0 siblings, 1 reply; 2+ messages in thread
From: Juergen Gross @ 2018-07-02 10:00 UTC (permalink / raw)
To: linux-kernel, xen-devel, x86
Cc: boris.ostrovsky, hpa, tglx, mingo, Juergen Gross, stable
When removing the global bit from __supported_pte_mask do the same for
__default_kernel_pte_mask in order to avoid the WARN_ONCE() in
check_pgprot() when setting a kernel pte before having called
init_mem_mapping().
Cc: <stable@vger.kernel.org> # 4.17
Reported-by: Michael Young <m.a.young@durham.ac.uk>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/xen/enlighten_pv.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 0f4cd9e5bed4..cf7b13d3e911 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1230,6 +1230,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
/* Prevent unwanted bits from being set in PTEs. */
__supported_pte_mask &= ~_PAGE_GLOBAL;
+ __default_kernel_pte_mask &= ~_PAGE_GLOBAL;
/*
* Prevent page tables from being allocated in highmem, even
--
2.13.7
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests
2018-07-02 10:00 [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests Juergen Gross
@ 2018-07-10 22:27 ` Boris Ostrovsky
0 siblings, 0 replies; 2+ messages in thread
From: Boris Ostrovsky @ 2018-07-10 22:27 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, xen-devel, x86; +Cc: hpa, tglx, mingo, stable
On 07/02/2018 06:00 AM, Juergen Gross wrote:
> When removing the global bit from __supported_pte_mask do the same for
> __default_kernel_pte_mask in order to avoid the WARN_ONCE() in
> check_pgprot() when setting a kernel pte before having called
> init_mem_mapping().
>
> Cc: <stable@vger.kernel.org> # 4.17
> Reported-by: Michael Young <m.a.young@durham.ac.uk>
> Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-07-02 10:00 [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests Juergen Gross
2018-07-10 22:27 ` Boris Ostrovsky
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