linux-kernel - [ 078/100] x86/kvm: Fix pvclock vsyscall fixmap

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Message-Id: <20130312223131.322574387@linuxfoundation.org>
Date:	Tue, 12 Mar 2013 15:32:03 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: [ 078/100] x86/kvm: Fix pvclock vsyscall fixmap

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Hurley <peter@...leysoftware.com>

commit 3d2a80a230250c2534ce5b17503670adaf1d7fff upstream.

The physical memory fixmapped for the pvclock clock_gettime vsyscall
was allocated, and thus is not a kernel symbol. __pa() is the proper
method to use in this case.

Fixes the crash below when booting a next-20130204+ smp guest on a
3.8-rc5+ KVM host.

[    0.666410] udevd[97]: starting version 175
[    0.674043] udevd[97]: udevd:[97]: segfault at ffffffffff5fd020
     ip 00007fff069e277f sp 00007fff068c9ef8 error d

Acked-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Gleb Natapov <gleb@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/pvclock.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -185,7 +185,7 @@ int __init pvclock_init_vsyscall(struct
 
 	for (idx = 0; idx <= (PVCLOCK_FIXMAP_END-PVCLOCK_FIXMAP_BEGIN); idx++) {
 		__set_fixmap(PVCLOCK_FIXMAP_BEGIN + idx,
-			     __pa_symbol(i) + (idx*PAGE_SIZE),
+			     __pa(i) + (idx*PAGE_SIZE),
 			     PAGE_KERNEL_VVAR);
 	}
 


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