This is a note to let you know that I have just added a patch titled
MIPS: KVM: Allocate at least 16KB for exception handlers
to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue
This patch is scheduled to be released in version 3.13.11.5.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
------
>From 634b1384fb1d61ab2887c240494689da6aad1605 Mon Sep 17 00:00:00 2001
From: James Hogan <[email protected]>
Date: Thu, 29 May 2014 10:16:23 +0100
Subject: MIPS: KVM: Allocate at least 16KB for exception handlers
commit 7006e2dfda9adfa40251093604db76d7e44263b3 upstream.
Each MIPS KVM guest has its own copy of the KVM exception vector. This
contains the TLB refill exception handler at offset 0x000, the general
exception handler at offset 0x180, and interrupt exception handlers at
offset 0x200 in case Cause_IV=1. A common handler is copied to offset
0x2000 and offset 0x3000 is used for temporarily storing k1 during entry
from guest.
However the amount of memory allocated for this purpose is calculated as
0x200 rounded up to the next page boundary, which is insufficient if 4KB
pages are in use. This can lead to the common handler at offset 0x2000
being overwritten and infinitely recursive exceptions on the next exit
from the guest.
Increase the minimum size from 0x200 to 0x4000 to cover the full use of
the page.
Signed-off-by: James Hogan <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Gleb Natapov <[email protected]>
Cc: [email protected]
Cc: Ralf Baechle <[email protected]>
Cc: [email protected]
Cc: Sanjay Lal <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
---
arch/mips/kvm/kvm_mips.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c
index 73b3482..3dfbe82 100644
--- a/arch/mips/kvm/kvm_mips.c
+++ b/arch/mips/kvm/kvm_mips.c
@@ -304,7 +304,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
if (cpu_has_veic || cpu_has_vint) {
size = 0x200 + VECTORSPACING * 64;
} else {
- size = 0x200;
+ size = 0x4000;
}
/* Save Linux EBASE */
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
