diff options
| author | Nadav Amit <namit@vmware.com> | 2018-06-19 16:00:24 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 12:56:30 +0200 |
| commit | 09755690c6b7c1eabdc4651eb3b276f8feb1e447 (patch) | |
| tree | f660e7c52ebe79857e74ae7d0b5dfaf87adfcb50 /drivers/misc/vmw_balloon.c | |
| parent | 10f146639fee5ffaf7cf0081c1af518f7d0c533c (diff) | |
| download | linux-09755690c6b7c1eabdc4651eb3b276f8feb1e447.tar.gz | |
vmw_balloon: fix inflation of 64-bit GFNs
When balloon batching is not supported by the hypervisor, the guest
frame number (GFN) must fit in 32-bit. However, due to a bug, this check
was mistakenly ignored. In practice, when total RAM is greater than
16TB, the balloon does not work currently, making this bug unlikely to
happen.
Fixes: ef0f8f112984 ("VMware balloon: partially inline vmballoon_reserve_page.")
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>
Diffstat (limited to 'drivers/misc/vmw_balloon.c')
| -rw-r--r-- | drivers/misc/vmw_balloon.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index efd733472a353..28e77ab1e136d 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -450,7 +450,7 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn, pfn32 = (u32)pfn; if (pfn32 != pfn) - return -1; + return -EINVAL; STATS_INC(b->stats.lock[false]); @@ -460,7 +460,7 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn, pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status); STATS_INC(b->stats.lock_fail[false]); - return 1; + return -EIO; } static int vmballoon_send_batched_lock(struct vmballoon *b, @@ -597,11 +597,12 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages, locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status, target); - if (locked > 0) { + if (locked) { STATS_INC(b->stats.refused_alloc[false]); - if (hv_status == VMW_BALLOON_ERROR_RESET || - hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) { + if (locked == -EIO && + (hv_status == VMW_BALLOON_ERROR_RESET || + hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED)) { vmballoon_free_page(page, false); return -EIO; } @@ -617,7 +618,7 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages, } else { vmballoon_free_page(page, false); } - return -EIO; + return locked; } /* track allocated page */ |