| From 421b8f20d3c381b215f988b42428f56fc3b82405 Mon Sep 17 00:00:00 2001 |
| From: Vitaly Kuznetsov <vkuznets@redhat.com> |
| Date: Wed, 7 Dec 2016 01:16:25 -0800 |
| Subject: hv: allocate synic pages for all present CPUs |
| |
| From: Vitaly Kuznetsov <vkuznets@redhat.com> |
| |
| commit 421b8f20d3c381b215f988b42428f56fc3b82405 upstream. |
| |
| It may happen that not all CPUs are online when we do hv_synic_alloc() and |
| in case more CPUs come online later we may try accessing these allocated |
| structures. |
| |
| Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> |
| Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/hv/hv.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| --- a/drivers/hv/hv.c |
| +++ b/drivers/hv/hv.c |
| @@ -411,7 +411,7 @@ int hv_synic_alloc(void) |
| goto err; |
| } |
| |
| - for_each_online_cpu(cpu) { |
| + for_each_present_cpu(cpu) { |
| hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC); |
| if (hv_context.event_dpc[cpu] == NULL) { |
| pr_err("Unable to allocate event dpc\n"); |
| @@ -482,7 +482,7 @@ void hv_synic_free(void) |
| int cpu; |
| |
| kfree(hv_context.hv_numa_map); |
| - for_each_online_cpu(cpu) |
| + for_each_present_cpu(cpu) |
| hv_synic_free_cpu(cpu); |
| } |
| |
