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authorChristian Borntraeger <borntraeger@de.ibm.com>2011-06-06 14:14:38 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-06-06 14:14:56 +0200
commita578b37cc2e719447810343089a7cb93efc3812f (patch)
tree2aec852e2d10c710c79d5a6b50b680d05aeff460 /arch/s390
parent59c5f46fbe01a00eedf54a23789634438bb80603 (diff)
[S390] kvm-s390: Fix host crash on misbehaving guests
commit 9ff4cfb3fcfd48b49fdd9be7381b3be340853aa4 ([S390] kvm-390: Let kernel exit SIE instruction on work) fixed a problem of commit commit cd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72 ([S390] virtualization aware cpu measurement) but uncovered another one. If a kvm guest accesses guest real memory that doesnt exist, the page fault handler calls the sie hook, which then rewrites the return psw from sie_inst to either sie_exit or sie_reenter. On return, the page fault handler will then detect the wrong access as a kernel fault causing a kernel oops in sie_reenter or sie_exit. We have to add these two addresses to the exception table to allow graceful exits. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/sie64a.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kvm/sie64a.S b/arch/s390/kvm/sie64a.S
index ab0e041ac54..5faa1b1b23f 100644
--- a/arch/s390/kvm/sie64a.S
+++ b/arch/s390/kvm/sie64a.S
@@ -93,4 +93,6 @@ sie_err:
.section __ex_table,"a"
.quad sie_inst,sie_err
+ .quad sie_exit,sie_err
+ .quad sie_reenter,sie_err
.previous