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authorK. Y. Srinivasan <kys@microsoft.com>2013-03-29 07:36:11 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-29 08:53:12 -0700
commit647965a268fd876781dd9899185482682bf42f6a (patch)
treefbcfd05483c368c816ca44b880ba810e8950494c /drivers/hv
parent39d791649781f6bb6937a217764a928b660375e2 (diff)
Drivers: hv: balloon: Permit Linux to specify hot-add alignment requirements
Some Windows hosts permit the guest to specify memory hot-add alignment requirements (if any). Linux currently requires a 128MB alignment on memory segments that can be hot-added. Specify this alignment requirement to the host. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_balloon.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index d5225261ee54..2250bf532bb0 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -117,7 +117,14 @@ union dm_caps {
struct {
__u64 balloon:1;
__u64 hot_add:1;
- __u64 reservedz:62;
+ /*
+ * To support guests that may have alignment
+ * limitations on hot-add, the guest can specify
+ * its alignment requirements; a value of n
+ * represents an alignment of 2^n in mega bytes.
+ */
+ __u64 hot_add_alignment:4;
+ __u64 reservedz:58;
} cap_bits;
__u64 caps;
} __packed;
@@ -774,7 +781,7 @@ static unsigned long process_hot_add(unsigned long pg_start,
* If the host has specified a hot-add range; deal with it first.
*/
- if ((rg_size != 0) && (!dm_device.host_specified_ha_region)) {
+ if (rg_size != 0) {
ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL);
if (!ha_region)
return 0;
@@ -1367,6 +1374,12 @@ static int balloon_probe(struct hv_device *dev,
cap_msg.caps.cap_bits.hot_add = 1;
/*
+ * Specify our alignment requirements as it relates
+ * memory hot-add. Specify 128MB alignment.
+ */
+ cap_msg.caps.cap_bits.hot_add_alignment = 7;
+
+ /*
* Currently the host does not use these
* values and we set them to what is done in the
* Windows driver.

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