4.9-stable review patch. If anyone has any objections, please let me know.
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From: Nadav Amit namit@vmware.com
commit 90d72ce079791399ac255c75728f3c9e747b093d upstream.
Embarrassingly, the recent fix introduced worse problem than it solved, causing the balloon not to inflate. The VM informed the hypervisor that the pages for lock/unlock are sitting in the wrong address, as it used the page that is used the uninitialized page variable.
Fixes: b23220fe054e9 ("vmw_balloon: fixing double free when batching mode is off") Cc: stable@vger.kernel.org Reviewed-by: Xavier Deguillard xdeguillard@vmware.com Signed-off-by: Nadav Amit namit@vmware.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/misc/vmw_balloon.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -467,7 +467,7 @@ static int vmballoon_send_batched_lock(s unsigned int num_pages, bool is_2m_pages, unsigned int *target) { unsigned long status; - unsigned long pfn = page_to_pfn(b->page); + unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
STATS_INC(b->stats.lock[is_2m_pages]);
@@ -515,7 +515,7 @@ static bool vmballoon_send_batched_unloc unsigned int num_pages, bool is_2m_pages, unsigned int *target) { unsigned long status; - unsigned long pfn = page_to_pfn(b->page); + unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
STATS_INC(b->stats.unlock[is_2m_pages]);