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hv_balloon: Add the support of hibernation 

When hibernation is enabled, we must ignore the balloon up/down and
hot-add requests from the host, if any.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2019-11-19 23:16:05 -08:00 committed by Sasha Levin
parent b96f86534f
commit 25bd2b2f1f
1 changed files with 85 additions and 2 deletions
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87
drivers/hv/hv_balloon.c
View File

@ -25,6 +25,8 @@
#include <linux/hyperv.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
#define CREATE_TRACE_POINTS
#include "hv_trace_balloon.h"
@ -456,6 +458,7 @@ struct hot_add_wrk {
struct work_struct wrk;
};
static bool allow_hibernation;
static bool hot_add = true;
static bool do_hot_add;
/*
@ -1052,8 +1055,12 @@ static void hot_add_req(struct work_struct *dummy)
else
resp.result = 0;
if (!do_hot_add || (resp.page_count == 0))
pr_err("Memory hot add failed\n");
if (!do_hot_add || resp.page_count == 0) {
if (!allow_hibernation)
pr_err("Memory hot add failed\n");
else
pr_info("Ignore hot-add request!\n");
}
dm->state = DM_INITIALIZED;
resp.hdr.trans_id = atomic_inc_return(&trans_id);
@ -1508,6 +1515,11 @@ static void balloon_onchannelcallback(void *context)
break;
case DM_BALLOON_REQUEST:
if (allow_hibernation) {
pr_info("Ignore balloon-up request!\n");
break;
}
if (dm->state == DM_BALLOON_UP)
pr_warn("Currently ballooning\n");
bal_msg = (struct dm_balloon *)recv_buffer;
@ -1517,6 +1529,11 @@ static void balloon_onchannelcallback(void *context)
break;
case DM_UNBALLOON_REQUEST:
if (allow_hibernation) {
pr_info("Ignore balloon-down request!\n");
break;
}
dm->state = DM_BALLOON_DOWN;
balloon_down(dm,
(struct dm_unballoon_request *)recv_buffer);
@ -1622,6 +1639,11 @@ static int balloon_connect_vsp(struct hv_device *dev)
cap_msg.hdr.size = sizeof(struct dm_capabilities);
cap_msg.hdr.trans_id = atomic_inc_return(&trans_id);
/*
* When hibernation (i.e. virtual ACPI S4 state) is enabled, the host
* currently still requires the bits to be set, so we have to add code
* to fail the host's hot-add and balloon up/down requests, if any.
*/
cap_msg.caps.cap_bits.balloon = 1;
cap_msg.caps.cap_bits.hot_add = 1;
@ -1671,6 +1693,10 @@ static int balloon_probe(struct hv_device *dev,
{
int ret;
allow_hibernation = hv_is_hibernation_supported();
if (allow_hibernation)
hot_add = false;
#ifdef CONFIG_MEMORY_HOTPLUG
do_hot_add = hot_add;
#else
@ -1710,6 +1736,8 @@ static int balloon_probe(struct hv_device *dev,
return 0;
probe_error:
dm_device.state = DM_INIT_ERROR;
dm_device.thread = NULL;
vmbus_close(dev->channel);
#ifdef CONFIG_MEMORY_HOTPLUG
unregister_memory_notifier(&hv_memory_nb);
@ -1751,6 +1779,59 @@ static int balloon_remove(struct hv_device *dev)
return 0;
}
static int balloon_suspend(struct hv_device *hv_dev)
{
struct hv_dynmem_device *dm = hv_get_drvdata(hv_dev);
tasklet_disable(&hv_dev->channel->callback_event);
cancel_work_sync(&dm->balloon_wrk.wrk);
cancel_work_sync(&dm->ha_wrk.wrk);
if (dm->thread) {
kthread_stop(dm->thread);
dm->thread = NULL;
vmbus_close(hv_dev->channel);
}
tasklet_enable(&hv_dev->channel->callback_event);
return 0;
}
static int balloon_resume(struct hv_device *dev)
{
int ret;
dm_device.state = DM_INITIALIZING;
ret = balloon_connect_vsp(dev);
if (ret != 0)
goto out;
dm_device.thread =
kthread_run(dm_thread_func, &dm_device, "hv_balloon");
if (IS_ERR(dm_device.thread)) {
ret = PTR_ERR(dm_device.thread);
dm_device.thread = NULL;
goto close_channel;
}
dm_device.state = DM_INITIALIZED;
return 0;
close_channel:
vmbus_close(dev->channel);
out:
dm_device.state = DM_INIT_ERROR;
#ifdef CONFIG_MEMORY_HOTPLUG
unregister_memory_notifier(&hv_memory_nb);
restore_online_page_callback(&hv_online_page);
#endif
return ret;
}
static const struct hv_vmbus_device_id id_table[] = {
/* Dynamic Memory Class ID */
/* 525074DC-8985-46e2-8057-A307DC18A502 */
@ -1765,6 +1846,8 @@ static struct hv_driver balloon_drv = {
.id_table = id_table,
.probe = balloon_probe,
.remove = balloon_remove,
.suspend = balloon_suspend,
.resume = balloon_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},