From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
x86@kernel.org
Cc: boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de,
mingo@redhat.com, Juergen Gross <jgross@suse.com>,
stable@vger.kernel.org
Subject: [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests
Date: Mon, 2 Jul 2018 12:00:18 +0200 [thread overview]
Message-ID: <20180702100018.26279-1-jgross@suse.com> (raw)
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
next reply other threads:[~2018-07-02 10:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 10:00 Juergen Gross [this message]
2018-07-10 22:27 ` [PATCH] xen: remove global bit from __default_kernel_pte_mask for pv guests Boris Ostrovsky
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