diff options
author | Aravindh Puthiyaparambil <aravindp@cisco.com> | 2013-06-03 15:42:46 +0200 |
---|---|---|
committer | Jan Beulich <jbeulich@suse.com> | 2013-06-03 15:42:46 +0200 |
commit | 5cffb77c4072fa5b46700a2dbb3e46c5a54eba6d (patch) | |
tree | 725d22ba8f56d5dec57a7ecb6bc9bf1baa4c526b | |
parent | b14fed71515bc6887d288169890c02f7bbe5d960 (diff) | |
download | xen-5cffb77c4072fa5b46700a2dbb3e46c5a54eba6d.tar.gz xen-5cffb77c4072fa5b46700a2dbb3e46c5a54eba6d.tar.bz2 xen-5cffb77c4072fa5b46700a2dbb3e46c5a54eba6d.zip |
x86/MCE: disable if MCE banks are not present
When booting Xen on VMware ESX 5.1 and Workstation 9, you hit a GPF
during MCE initialization. The culprit is line 631 in
set_poll_bankmask():
bitmap_copy(mb->bank_map, mca_allbanks->bank_map, nr_mce_banks);
What is happening is that in mca_cap_init(), nr_mce_banks is being set
to 0. This causes the allocation of bank_map to be set to
ZERO_BLOCK_PTR which is the return value for zero-size allocation by
xzalloc_array()/_xmalloc(). This results in the bitmap_copy() to fail
disastrously. The following patch fixes this issue.
Signed-off-by: Aravindh Puthiyaparambil <aravindp@cisco.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Christoph Egger <chegger@amazon.de>
-rw-r--r-- | xen/arch/x86/cpu/mcheck/mce.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c index 6712db1df9..93d7ae1647 100644 --- a/xen/arch/x86/cpu/mcheck/mce.c +++ b/xen/arch/x86/cpu/mcheck/mce.c @@ -652,7 +652,14 @@ int mca_cap_init(void) } nr_mce_banks = msr_content & MCG_CAP_COUNT; - /* mcabanks_alloc depends on nr_mcebanks */ + if (!nr_mce_banks) + { + printk(XENLOG_INFO "CPU%u: No MCE banks present. " + "Machine check support disabled\n", smp_processor_id()); + return -ENODEV; + } + + /* mcabanks_alloc depends on nr_mce_banks */ if (!mca_allbanks) { int i; |