2012-11-14 09:09:02 +00:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2012, Microsoft Corporation.
|
|
|
|
*
|
|
|
|
* Author:
|
|
|
|
* K. Y. Srinivasan <kys@microsoft.com>
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
|
|
* by the Free Software Foundation.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful, but
|
|
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
|
|
* details.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/mman.h>
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/kthread.h>
|
|
|
|
#include <linux/completion.h>
|
|
|
|
#include <linux/memory_hotplug.h>
|
|
|
|
#include <linux/memory.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/percpu_counter.h>
|
|
|
|
|
|
|
|
#include <linux/hyperv.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We begin with definitions supporting the Dynamic Memory protocol
|
|
|
|
* with the host.
|
|
|
|
*
|
|
|
|
* Begin protocol definitions.
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Protocol versions. The low word is the minor version, the high word the major
|
|
|
|
* version.
|
|
|
|
*
|
|
|
|
* History:
|
|
|
|
* Initial version 1.0
|
|
|
|
* Changed to 0.1 on 2009/03/25
|
|
|
|
* Changes to 0.2 on 2009/05/14
|
|
|
|
* Changes to 0.3 on 2009/12/03
|
|
|
|
* Changed to 1.0 on 2011/04/05
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor)))
|
|
|
|
#define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16)
|
|
|
|
#define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff)
|
|
|
|
|
|
|
|
enum {
|
|
|
|
DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3),
|
|
|
|
DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0),
|
|
|
|
|
|
|
|
DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1,
|
|
|
|
DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2,
|
|
|
|
|
|
|
|
DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN8
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Message Types
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum dm_message_type {
|
|
|
|
/*
|
|
|
|
* Version 0.3
|
|
|
|
*/
|
|
|
|
DM_ERROR = 0,
|
|
|
|
DM_VERSION_REQUEST = 1,
|
|
|
|
DM_VERSION_RESPONSE = 2,
|
|
|
|
DM_CAPABILITIES_REPORT = 3,
|
|
|
|
DM_CAPABILITIES_RESPONSE = 4,
|
|
|
|
DM_STATUS_REPORT = 5,
|
|
|
|
DM_BALLOON_REQUEST = 6,
|
|
|
|
DM_BALLOON_RESPONSE = 7,
|
|
|
|
DM_UNBALLOON_REQUEST = 8,
|
|
|
|
DM_UNBALLOON_RESPONSE = 9,
|
|
|
|
DM_MEM_HOT_ADD_REQUEST = 10,
|
|
|
|
DM_MEM_HOT_ADD_RESPONSE = 11,
|
|
|
|
DM_VERSION_03_MAX = 11,
|
|
|
|
/*
|
|
|
|
* Version 1.0.
|
|
|
|
*/
|
|
|
|
DM_INFO_MESSAGE = 12,
|
|
|
|
DM_VERSION_1_MAX = 12
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Structures defining the dynamic memory management
|
|
|
|
* protocol.
|
|
|
|
*/
|
|
|
|
|
|
|
|
union dm_version {
|
|
|
|
struct {
|
|
|
|
__u16 minor_version;
|
|
|
|
__u16 major_version;
|
|
|
|
};
|
|
|
|
__u32 version;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
union dm_caps {
|
|
|
|
struct {
|
|
|
|
__u64 balloon:1;
|
|
|
|
__u64 hot_add:1;
|
|
|
|
__u64 reservedz:62;
|
|
|
|
} cap_bits;
|
|
|
|
__u64 caps;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
union dm_mem_page_range {
|
|
|
|
struct {
|
|
|
|
/*
|
|
|
|
* The PFN number of the first page in the range.
|
|
|
|
* 40 bits is the architectural limit of a PFN
|
|
|
|
* number for AMD64.
|
|
|
|
*/
|
|
|
|
__u64 start_page:40;
|
|
|
|
/*
|
|
|
|
* The number of pages in the range.
|
|
|
|
*/
|
|
|
|
__u64 page_cnt:24;
|
|
|
|
} finfo;
|
|
|
|
__u64 page_range;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The header for all dynamic memory messages:
|
|
|
|
*
|
|
|
|
* type: Type of the message.
|
|
|
|
* size: Size of the message in bytes; including the header.
|
|
|
|
* trans_id: The guest is responsible for manufacturing this ID.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_header {
|
|
|
|
__u16 type;
|
|
|
|
__u16 size;
|
|
|
|
__u32 trans_id;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A generic message format for dynamic memory.
|
|
|
|
* Specific message formats are defined later in the file.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_message {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u8 data[]; /* enclosed message */
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Specific message types supporting the dynamic memory protocol.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Version negotiation message. Sent from the guest to the host.
|
|
|
|
* The guest is free to try different versions until the host
|
|
|
|
* accepts the version.
|
|
|
|
*
|
|
|
|
* dm_version: The protocol version requested.
|
|
|
|
* is_last_attempt: If TRUE, this is the last version guest will request.
|
|
|
|
* reservedz: Reserved field, set to zero.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_version_request {
|
|
|
|
struct dm_header hdr;
|
|
|
|
union dm_version version;
|
|
|
|
__u32 is_last_attempt:1;
|
|
|
|
__u32 reservedz:31;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Version response message; Host to Guest and indicates
|
|
|
|
* if the host has accepted the version sent by the guest.
|
|
|
|
*
|
|
|
|
* is_accepted: If TRUE, host has accepted the version and the guest
|
|
|
|
* should proceed to the next stage of the protocol. FALSE indicates that
|
|
|
|
* guest should re-try with a different version.
|
|
|
|
*
|
|
|
|
* reservedz: Reserved field, set to zero.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_version_response {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u64 is_accepted:1;
|
|
|
|
__u64 reservedz:63;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Message reporting capabilities. This is sent from the guest to the
|
|
|
|
* host.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_capabilities {
|
|
|
|
struct dm_header hdr;
|
|
|
|
union dm_caps caps;
|
|
|
|
__u64 min_page_cnt;
|
|
|
|
__u64 max_page_number;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Response to the capabilities message. This is sent from the host to the
|
|
|
|
* guest. This message notifies if the host has accepted the guest's
|
|
|
|
* capabilities. If the host has not accepted, the guest must shutdown
|
|
|
|
* the service.
|
|
|
|
*
|
|
|
|
* is_accepted: Indicates if the host has accepted guest's capabilities.
|
|
|
|
* reservedz: Must be 0.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_capabilities_resp_msg {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u64 is_accepted:1;
|
|
|
|
__u64 reservedz:63;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This message is used to report memory pressure from the guest.
|
|
|
|
* This message is not part of any transaction and there is no
|
|
|
|
* response to this message.
|
|
|
|
*
|
|
|
|
* num_avail: Available memory in pages.
|
|
|
|
* num_committed: Committed memory in pages.
|
|
|
|
* page_file_size: The accumulated size of all page files
|
|
|
|
* in the system in pages.
|
|
|
|
* zero_free: The nunber of zero and free pages.
|
|
|
|
* page_file_writes: The writes to the page file in pages.
|
|
|
|
* io_diff: An indicator of file cache efficiency or page file activity,
|
|
|
|
* calculated as File Cache Page Fault Count - Page Read Count.
|
|
|
|
* This value is in pages.
|
|
|
|
*
|
|
|
|
* Some of these metrics are Windows specific and fortunately
|
|
|
|
* the algorithm on the host side that computes the guest memory
|
|
|
|
* pressure only uses num_committed value.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_status {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u64 num_avail;
|
|
|
|
__u64 num_committed;
|
|
|
|
__u64 page_file_size;
|
|
|
|
__u64 zero_free;
|
|
|
|
__u32 page_file_writes;
|
|
|
|
__u32 io_diff;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Message to ask the guest to allocate memory - balloon up message.
|
|
|
|
* This message is sent from the host to the guest. The guest may not be
|
|
|
|
* able to allocate as much memory as requested.
|
|
|
|
*
|
|
|
|
* num_pages: number of pages to allocate.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_balloon {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u32 num_pages;
|
|
|
|
__u32 reservedz;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Balloon response message; this message is sent from the guest
|
|
|
|
* to the host in response to the balloon message.
|
|
|
|
*
|
|
|
|
* reservedz: Reserved; must be set to zero.
|
|
|
|
* more_pages: If FALSE, this is the last message of the transaction.
|
|
|
|
* if TRUE there will atleast one more message from the guest.
|
|
|
|
*
|
|
|
|
* range_count: The number of ranges in the range array.
|
|
|
|
*
|
|
|
|
* range_array: An array of page ranges returned to the host.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_balloon_response {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u32 reservedz;
|
|
|
|
__u32 more_pages:1;
|
|
|
|
__u32 range_count:31;
|
|
|
|
union dm_mem_page_range range_array[];
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Un-balloon message; this message is sent from the host
|
|
|
|
* to the guest to give guest more memory.
|
|
|
|
*
|
|
|
|
* more_pages: If FALSE, this is the last message of the transaction.
|
|
|
|
* if TRUE there will atleast one more message from the guest.
|
|
|
|
*
|
|
|
|
* reservedz: Reserved; must be set to zero.
|
|
|
|
*
|
|
|
|
* range_count: The number of ranges in the range array.
|
|
|
|
*
|
|
|
|
* range_array: An array of page ranges returned to the host.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_unballoon_request {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u32 more_pages:1;
|
|
|
|
__u32 reservedz:31;
|
|
|
|
__u32 range_count;
|
|
|
|
union dm_mem_page_range range_array[];
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Un-balloon response message; this message is sent from the guest
|
|
|
|
* to the host in response to an unballoon request.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_unballoon_response {
|
|
|
|
struct dm_header hdr;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Hot add request message. Message sent from the host to the guest.
|
|
|
|
*
|
|
|
|
* mem_range: Memory range to hot add.
|
|
|
|
*
|
|
|
|
* On Linux we currently don't support this since we cannot hot add
|
|
|
|
* arbitrary granularity of memory.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_hot_add {
|
|
|
|
struct dm_header hdr;
|
|
|
|
union dm_mem_page_range range;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Hot add response message.
|
|
|
|
* This message is sent by the guest to report the status of a hot add request.
|
|
|
|
* If page_count is less than the requested page count, then the host should
|
|
|
|
* assume all further hot add requests will fail, since this indicates that
|
|
|
|
* the guest has hit an upper physical memory barrier.
|
|
|
|
*
|
|
|
|
* Hot adds may also fail due to low resources; in this case, the guest must
|
|
|
|
* not complete this message until the hot add can succeed, and the host must
|
|
|
|
* not send a new hot add request until the response is sent.
|
|
|
|
* If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS
|
|
|
|
* times it fails the request.
|
|
|
|
*
|
|
|
|
*
|
|
|
|
* page_count: number of pages that were successfully hot added.
|
|
|
|
*
|
|
|
|
* result: result of the operation 1: success, 0: failure.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_hot_add_response {
|
|
|
|
struct dm_header hdr;
|
|
|
|
__u32 page_count;
|
|
|
|
__u32 result;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Types of information sent from host to the guest.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum dm_info_type {
|
|
|
|
INFO_TYPE_MAX_PAGE_CNT = 0,
|
|
|
|
MAX_INFO_TYPE
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Header for the information message.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_info_header {
|
|
|
|
enum dm_info_type type;
|
|
|
|
__u32 data_size;
|
|
|
|
} __packed;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This message is sent from the host to the guest to pass
|
|
|
|
* some relevant information (win8 addition).
|
|
|
|
*
|
|
|
|
* reserved: no used.
|
|
|
|
* info_size: size of the information blob.
|
|
|
|
* info: information blob.
|
|
|
|
*/
|
|
|
|
|
|
|
|
struct dm_info_msg {
|
2012-12-06 19:06:54 +00:00
|
|
|
struct dm_header hdr;
|
2012-11-14 09:09:02 +00:00
|
|
|
__u32 reserved;
|
|
|
|
__u32 info_size;
|
|
|
|
__u8 info[];
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* End protocol definitions.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static bool hot_add;
|
|
|
|
static bool do_hot_add;
|
|
|
|
|
|
|
|
module_param(hot_add, bool, (S_IRUGO | S_IWUSR));
|
|
|
|
MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add");
|
|
|
|
|
|
|
|
static atomic_t trans_id = ATOMIC_INIT(0);
|
|
|
|
|
|
|
|
static int dm_ring_size = (5 * PAGE_SIZE);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Driver specific state.
|
|
|
|
*/
|
|
|
|
|
|
|
|
enum hv_dm_state {
|
|
|
|
DM_INITIALIZING = 0,
|
|
|
|
DM_INITIALIZED,
|
|
|
|
DM_BALLOON_UP,
|
|
|
|
DM_BALLOON_DOWN,
|
|
|
|
DM_HOT_ADD,
|
|
|
|
DM_INIT_ERROR
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static __u8 recv_buffer[PAGE_SIZE];
|
|
|
|
static __u8 *send_buffer;
|
|
|
|
#define PAGES_IN_2M 512
|
|
|
|
|
|
|
|
struct hv_dynmem_device {
|
|
|
|
struct hv_device *dev;
|
|
|
|
enum hv_dm_state state;
|
|
|
|
struct completion host_event;
|
|
|
|
struct completion config_event;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Number of pages we have currently ballooned out.
|
|
|
|
*/
|
|
|
|
unsigned int num_pages_ballooned;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This thread handles both balloon/hot-add
|
|
|
|
* requests from the host as well as notifying
|
|
|
|
* the host with regards to memory pressure in
|
|
|
|
* the guest.
|
|
|
|
*/
|
|
|
|
struct task_struct *thread;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We start with the highest version we can support
|
|
|
|
* and downgrade based on the host; we save here the
|
|
|
|
* next version to try.
|
|
|
|
*/
|
|
|
|
__u32 next_version;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct hv_dynmem_device dm_device;
|
|
|
|
|
|
|
|
static void hot_add_req(struct hv_dynmem_device *dm, struct dm_hot_add *msg)
|
|
|
|
{
|
|
|
|
|
|
|
|
struct dm_hot_add_response resp;
|
|
|
|
|
|
|
|
if (do_hot_add) {
|
|
|
|
|
|
|
|
pr_info("Memory hot add not supported\n");
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Currently we do not support hot add.
|
|
|
|
* Just fail the request.
|
|
|
|
*/
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(&resp, 0, sizeof(struct dm_hot_add_response));
|
|
|
|
resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE;
|
|
|
|
resp.hdr.size = sizeof(struct dm_hot_add_response);
|
|
|
|
resp.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
|
|
|
|
resp.page_count = 0;
|
|
|
|
resp.result = 0;
|
|
|
|
|
|
|
|
dm->state = DM_INITIALIZED;
|
|
|
|
vmbus_sendpacket(dm->dev->channel, &resp,
|
|
|
|
sizeof(struct dm_hot_add_response),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
|
|
|
|
{
|
2012-12-06 19:06:54 +00:00
|
|
|
struct dm_info_header *info_hdr;
|
|
|
|
|
|
|
|
info_hdr = (struct dm_info_header *)msg->info;
|
|
|
|
|
|
|
|
switch (info_hdr->type) {
|
2012-11-14 09:09:02 +00:00
|
|
|
case INFO_TYPE_MAX_PAGE_CNT:
|
|
|
|
pr_info("Received INFO_TYPE_MAX_PAGE_CNT\n");
|
2012-12-06 19:06:54 +00:00
|
|
|
pr_info("Data Size is %d\n", info_hdr->data_size);
|
2012-11-14 09:09:02 +00:00
|
|
|
break;
|
|
|
|
default:
|
2012-12-06 19:06:54 +00:00
|
|
|
pr_info("Received Unknown type: %d\n", info_hdr->type);
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Post our status as it relates memory pressure to the
|
|
|
|
* host. Host expects the guests to post this status
|
|
|
|
* periodically at 1 second intervals.
|
|
|
|
*
|
|
|
|
* The metrics specified in this protocol are very Windows
|
|
|
|
* specific and so we cook up numbers here to convey our memory
|
|
|
|
* pressure.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void post_status(struct hv_dynmem_device *dm)
|
|
|
|
{
|
|
|
|
struct dm_status status;
|
2013-01-26 00:18:47 +00:00
|
|
|
struct sysinfo val;
|
2012-11-14 09:09:02 +00:00
|
|
|
|
2013-01-26 00:18:47 +00:00
|
|
|
si_meminfo(&val);
|
2012-11-14 09:09:02 +00:00
|
|
|
memset(&status, 0, sizeof(struct dm_status));
|
|
|
|
status.hdr.type = DM_STATUS_REPORT;
|
|
|
|
status.hdr.size = sizeof(struct dm_status);
|
|
|
|
status.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
|
2013-01-26 00:18:47 +00:00
|
|
|
/*
|
|
|
|
* The host expects the guest to report free memory.
|
|
|
|
* Further, the host expects the pressure information to
|
|
|
|
* include the ballooned out pages.
|
|
|
|
*/
|
|
|
|
status.num_avail = val.freeram;
|
|
|
|
status.num_committed = vm_memory_committed() + dm->num_pages_ballooned;
|
2012-11-14 09:09:02 +00:00
|
|
|
|
|
|
|
vmbus_sendpacket(dm->dev->channel, &status,
|
|
|
|
sizeof(struct dm_status),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
2012-11-21 20:46:40 +00:00
|
|
|
static void free_balloon_pages(struct hv_dynmem_device *dm,
|
2012-11-14 09:09:02 +00:00
|
|
|
union dm_mem_page_range *range_array)
|
|
|
|
{
|
|
|
|
int num_pages = range_array->finfo.page_cnt;
|
|
|
|
__u64 start_frame = range_array->finfo.start_page;
|
|
|
|
struct page *pg;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < num_pages; i++) {
|
|
|
|
pg = pfn_to_page(i + start_frame);
|
|
|
|
__free_page(pg);
|
|
|
|
dm->num_pages_ballooned--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static int alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
|
|
|
|
struct dm_balloon_response *bl_resp, int alloc_unit,
|
|
|
|
bool *alloc_error)
|
|
|
|
{
|
|
|
|
int i = 0;
|
|
|
|
struct page *pg;
|
|
|
|
|
|
|
|
if (num_pages < alloc_unit)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
for (i = 0; (i * alloc_unit) < num_pages; i++) {
|
|
|
|
if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) >
|
|
|
|
PAGE_SIZE)
|
|
|
|
return i * alloc_unit;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We execute this code in a thread context. Furthermore,
|
|
|
|
* we don't want the kernel to try too hard.
|
|
|
|
*/
|
|
|
|
pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY |
|
|
|
|
__GFP_NOMEMALLOC | __GFP_NOWARN,
|
|
|
|
get_order(alloc_unit << PAGE_SHIFT));
|
|
|
|
|
|
|
|
if (!pg) {
|
|
|
|
*alloc_error = true;
|
|
|
|
return i * alloc_unit;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
dm->num_pages_ballooned += alloc_unit;
|
|
|
|
|
|
|
|
bl_resp->range_count++;
|
|
|
|
bl_resp->range_array[i].finfo.start_page =
|
|
|
|
page_to_pfn(pg);
|
|
|
|
bl_resp->range_array[i].finfo.page_cnt = alloc_unit;
|
|
|
|
bl_resp->hdr.size += sizeof(union dm_mem_page_range);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return num_pages;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void balloon_up(struct hv_dynmem_device *dm, struct dm_balloon *req)
|
|
|
|
{
|
|
|
|
int num_pages = req->num_pages;
|
|
|
|
int num_ballooned = 0;
|
|
|
|
struct dm_balloon_response *bl_resp;
|
|
|
|
int alloc_unit;
|
|
|
|
int ret;
|
|
|
|
bool alloc_error = false;
|
|
|
|
bool done = false;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Currently, we only support 4k allocations.
|
|
|
|
*/
|
|
|
|
alloc_unit = 1;
|
|
|
|
|
|
|
|
while (!done) {
|
|
|
|
bl_resp = (struct dm_balloon_response *)send_buffer;
|
|
|
|
memset(send_buffer, 0, PAGE_SIZE);
|
|
|
|
bl_resp->hdr.type = DM_BALLOON_RESPONSE;
|
|
|
|
bl_resp->hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
bl_resp->hdr.size = sizeof(struct dm_balloon_response);
|
|
|
|
bl_resp->more_pages = 1;
|
|
|
|
|
|
|
|
|
|
|
|
num_pages -= num_ballooned;
|
|
|
|
num_ballooned = alloc_balloon_pages(dm, num_pages,
|
|
|
|
bl_resp, alloc_unit,
|
|
|
|
&alloc_error);
|
|
|
|
|
|
|
|
if ((alloc_error) || (num_ballooned == num_pages)) {
|
|
|
|
bl_resp->more_pages = 0;
|
|
|
|
done = true;
|
|
|
|
dm->state = DM_INITIALIZED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We are pushing a lot of data through the channel;
|
|
|
|
* deal with transient failures caused because of the
|
|
|
|
* lack of space in the ring buffer.
|
|
|
|
*/
|
|
|
|
|
|
|
|
do {
|
|
|
|
ret = vmbus_sendpacket(dm_device.dev->channel,
|
|
|
|
bl_resp,
|
|
|
|
bl_resp->hdr.size,
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
|
|
|
|
if (ret == -EAGAIN)
|
|
|
|
msleep(20);
|
|
|
|
|
|
|
|
} while (ret == -EAGAIN);
|
|
|
|
|
|
|
|
if (ret) {
|
|
|
|
/*
|
|
|
|
* Free up the memory we allocatted.
|
|
|
|
*/
|
|
|
|
pr_info("Balloon response failed\n");
|
|
|
|
|
|
|
|
for (i = 0; i < bl_resp->range_count; i++)
|
|
|
|
free_balloon_pages(dm,
|
|
|
|
&bl_resp->range_array[i]);
|
|
|
|
|
|
|
|
done = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static void balloon_down(struct hv_dynmem_device *dm,
|
|
|
|
struct dm_unballoon_request *req)
|
|
|
|
{
|
|
|
|
union dm_mem_page_range *range_array = req->range_array;
|
|
|
|
int range_count = req->range_count;
|
|
|
|
struct dm_unballoon_response resp;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < range_count; i++)
|
|
|
|
free_balloon_pages(dm, &range_array[i]);
|
|
|
|
|
|
|
|
if (req->more_pages == 1)
|
|
|
|
return;
|
|
|
|
|
|
|
|
memset(&resp, 0, sizeof(struct dm_unballoon_response));
|
|
|
|
resp.hdr.type = DM_UNBALLOON_RESPONSE;
|
|
|
|
resp.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
resp.hdr.size = sizeof(struct dm_unballoon_response);
|
|
|
|
|
|
|
|
vmbus_sendpacket(dm_device.dev->channel, &resp,
|
|
|
|
sizeof(struct dm_unballoon_response),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
|
|
|
|
dm->state = DM_INITIALIZED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void balloon_onchannelcallback(void *context);
|
|
|
|
|
|
|
|
static int dm_thread_func(void *dm_dev)
|
|
|
|
{
|
|
|
|
struct hv_dynmem_device *dm = dm_dev;
|
|
|
|
int t;
|
|
|
|
unsigned long scan_start;
|
|
|
|
|
|
|
|
while (!kthread_should_stop()) {
|
|
|
|
t = wait_for_completion_timeout(&dm_device.config_event, 1*HZ);
|
|
|
|
/*
|
|
|
|
* The host expects us to post information on the memory
|
|
|
|
* pressure every second.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (t == 0)
|
|
|
|
post_status(dm);
|
|
|
|
|
|
|
|
scan_start = jiffies;
|
|
|
|
switch (dm->state) {
|
|
|
|
case DM_BALLOON_UP:
|
|
|
|
balloon_up(dm, (struct dm_balloon *)recv_buffer);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_HOT_ADD:
|
|
|
|
hot_add_req(dm, (struct dm_hot_add *)recv_buffer);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!time_in_range(jiffies, scan_start, scan_start + HZ))
|
|
|
|
post_status(dm);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void version_resp(struct hv_dynmem_device *dm,
|
|
|
|
struct dm_version_response *vresp)
|
|
|
|
{
|
|
|
|
struct dm_version_request version_req;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (vresp->is_accepted) {
|
|
|
|
/*
|
|
|
|
* We are done; wakeup the
|
|
|
|
* context waiting for version
|
|
|
|
* negotiation.
|
|
|
|
*/
|
|
|
|
complete(&dm->host_event);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* If there are more versions to try, continue
|
|
|
|
* with negotiations; if not
|
|
|
|
* shutdown the service since we are not able
|
|
|
|
* to negotiate a suitable version number
|
|
|
|
* with the host.
|
|
|
|
*/
|
|
|
|
if (dm->next_version == 0)
|
|
|
|
goto version_error;
|
|
|
|
|
|
|
|
dm->next_version = 0;
|
|
|
|
memset(&version_req, 0, sizeof(struct dm_version_request));
|
|
|
|
version_req.hdr.type = DM_VERSION_REQUEST;
|
|
|
|
version_req.hdr.size = sizeof(struct dm_version_request);
|
|
|
|
version_req.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN7;
|
|
|
|
version_req.is_last_attempt = 1;
|
|
|
|
|
|
|
|
ret = vmbus_sendpacket(dm->dev->channel, &version_req,
|
|
|
|
sizeof(struct dm_version_request),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND, 0);
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
goto version_error;
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
version_error:
|
|
|
|
dm->state = DM_INIT_ERROR;
|
|
|
|
complete(&dm->host_event);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cap_resp(struct hv_dynmem_device *dm,
|
|
|
|
struct dm_capabilities_resp_msg *cap_resp)
|
|
|
|
{
|
|
|
|
if (!cap_resp->is_accepted) {
|
|
|
|
pr_info("Capabilities not accepted by host\n");
|
|
|
|
dm->state = DM_INIT_ERROR;
|
|
|
|
}
|
|
|
|
complete(&dm->host_event);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void balloon_onchannelcallback(void *context)
|
|
|
|
{
|
|
|
|
struct hv_device *dev = context;
|
|
|
|
u32 recvlen;
|
|
|
|
u64 requestid;
|
|
|
|
struct dm_message *dm_msg;
|
|
|
|
struct dm_header *dm_hdr;
|
|
|
|
struct hv_dynmem_device *dm = hv_get_drvdata(dev);
|
|
|
|
|
|
|
|
memset(recv_buffer, 0, sizeof(recv_buffer));
|
|
|
|
vmbus_recvpacket(dev->channel, recv_buffer,
|
|
|
|
PAGE_SIZE, &recvlen, &requestid);
|
|
|
|
|
|
|
|
if (recvlen > 0) {
|
|
|
|
dm_msg = (struct dm_message *)recv_buffer;
|
|
|
|
dm_hdr = &dm_msg->hdr;
|
|
|
|
|
|
|
|
switch (dm_hdr->type) {
|
|
|
|
case DM_VERSION_RESPONSE:
|
|
|
|
version_resp(dm,
|
|
|
|
(struct dm_version_response *)dm_msg);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_CAPABILITIES_RESPONSE:
|
|
|
|
cap_resp(dm,
|
|
|
|
(struct dm_capabilities_resp_msg *)dm_msg);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_BALLOON_REQUEST:
|
|
|
|
dm->state = DM_BALLOON_UP;
|
|
|
|
complete(&dm->config_event);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_UNBALLOON_REQUEST:
|
|
|
|
dm->state = DM_BALLOON_DOWN;
|
|
|
|
balloon_down(dm,
|
|
|
|
(struct dm_unballoon_request *)recv_buffer);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_MEM_HOT_ADD_REQUEST:
|
|
|
|
dm->state = DM_HOT_ADD;
|
|
|
|
complete(&dm->config_event);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case DM_INFO_MESSAGE:
|
|
|
|
process_info(dm, (struct dm_info_msg *)dm_msg);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
pr_err("Unhandled message: type: %d\n", dm_hdr->type);
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
static int balloon_probe(struct hv_device *dev,
|
|
|
|
const struct hv_vmbus_device_id *dev_id)
|
|
|
|
{
|
|
|
|
int ret, t;
|
|
|
|
struct dm_version_request version_req;
|
|
|
|
struct dm_capabilities cap_msg;
|
|
|
|
|
|
|
|
do_hot_add = hot_add;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* First allocate a send buffer.
|
|
|
|
*/
|
|
|
|
|
|
|
|
send_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
|
|
if (!send_buffer)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0,
|
|
|
|
balloon_onchannelcallback, dev);
|
|
|
|
|
|
|
|
if (ret)
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error0;
|
2012-11-14 09:09:02 +00:00
|
|
|
|
|
|
|
dm_device.dev = dev;
|
|
|
|
dm_device.state = DM_INITIALIZING;
|
|
|
|
dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
|
|
|
|
init_completion(&dm_device.host_event);
|
|
|
|
init_completion(&dm_device.config_event);
|
|
|
|
|
|
|
|
dm_device.thread =
|
|
|
|
kthread_run(dm_thread_func, &dm_device, "hv_balloon");
|
|
|
|
if (IS_ERR(dm_device.thread)) {
|
|
|
|
ret = PTR_ERR(dm_device.thread);
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error1;
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
hv_set_drvdata(dev, &dm_device);
|
|
|
|
/*
|
|
|
|
* Initiate the hand shake with the host and negotiate
|
|
|
|
* a version that the host can support. We start with the
|
|
|
|
* highest version number and go down if the host cannot
|
|
|
|
* support it.
|
|
|
|
*/
|
|
|
|
memset(&version_req, 0, sizeof(struct dm_version_request));
|
|
|
|
version_req.hdr.type = DM_VERSION_REQUEST;
|
|
|
|
version_req.hdr.size = sizeof(struct dm_version_request);
|
|
|
|
version_req.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN8;
|
|
|
|
version_req.is_last_attempt = 0;
|
|
|
|
|
|
|
|
ret = vmbus_sendpacket(dev->channel, &version_req,
|
|
|
|
sizeof(struct dm_version_request),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND,
|
|
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
if (ret)
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
|
|
|
|
t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ);
|
|
|
|
if (t == 0) {
|
|
|
|
ret = -ETIMEDOUT;
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we could not negotiate a compatible version with the host
|
|
|
|
* fail the probe function.
|
|
|
|
*/
|
|
|
|
if (dm_device.state == DM_INIT_ERROR) {
|
|
|
|
ret = -ETIMEDOUT;
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Now submit our capabilities to the host.
|
|
|
|
*/
|
|
|
|
memset(&cap_msg, 0, sizeof(struct dm_capabilities));
|
|
|
|
cap_msg.hdr.type = DM_CAPABILITIES_REPORT;
|
|
|
|
cap_msg.hdr.size = sizeof(struct dm_capabilities);
|
|
|
|
cap_msg.hdr.trans_id = atomic_inc_return(&trans_id);
|
|
|
|
|
|
|
|
cap_msg.caps.cap_bits.balloon = 1;
|
|
|
|
/*
|
|
|
|
* While we currently don't support hot-add,
|
|
|
|
* we still advertise this capability since the
|
|
|
|
* host requires that guests partcipating in the
|
|
|
|
* dynamic memory protocol support hot add.
|
|
|
|
*/
|
|
|
|
cap_msg.caps.cap_bits.hot_add = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Currently the host does not use these
|
|
|
|
* values and we set them to what is done in the
|
|
|
|
* Windows driver.
|
|
|
|
*/
|
|
|
|
cap_msg.min_page_cnt = 0;
|
|
|
|
cap_msg.max_page_number = -1;
|
|
|
|
|
|
|
|
ret = vmbus_sendpacket(dev->channel, &cap_msg,
|
|
|
|
sizeof(struct dm_capabilities),
|
|
|
|
(unsigned long)NULL,
|
|
|
|
VM_PKT_DATA_INBAND,
|
|
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
if (ret)
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
|
|
|
|
t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ);
|
|
|
|
if (t == 0) {
|
|
|
|
ret = -ETIMEDOUT;
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the host does not like our capabilities,
|
|
|
|
* fail the probe function.
|
|
|
|
*/
|
|
|
|
if (dm_device.state == DM_INIT_ERROR) {
|
|
|
|
ret = -ETIMEDOUT;
|
2012-12-11 19:07:17 +00:00
|
|
|
goto probe_error2;
|
2012-11-14 09:09:02 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
dm_device.state = DM_INITIALIZED;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2012-12-11 19:07:17 +00:00
|
|
|
probe_error2:
|
2012-11-14 09:09:02 +00:00
|
|
|
kthread_stop(dm_device.thread);
|
|
|
|
|
2012-12-11 19:07:17 +00:00
|
|
|
probe_error1:
|
2012-11-14 09:09:02 +00:00
|
|
|
vmbus_close(dev->channel);
|
2012-12-11 19:07:17 +00:00
|
|
|
probe_error0:
|
|
|
|
kfree(send_buffer);
|
2012-11-14 09:09:02 +00:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int balloon_remove(struct hv_device *dev)
|
|
|
|
{
|
|
|
|
struct hv_dynmem_device *dm = hv_get_drvdata(dev);
|
|
|
|
|
|
|
|
if (dm->num_pages_ballooned != 0)
|
|
|
|
pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned);
|
|
|
|
|
|
|
|
vmbus_close(dev->channel);
|
|
|
|
kthread_stop(dm->thread);
|
2012-12-11 19:07:17 +00:00
|
|
|
kfree(send_buffer);
|
2012-11-14 09:09:02 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct hv_vmbus_device_id id_table[] = {
|
|
|
|
/* Dynamic Memory Class ID */
|
|
|
|
/* 525074DC-8985-46e2-8057-A307DC18A502 */
|
2013-01-24 01:42:41 +00:00
|
|
|
{ HV_DM_GUID, },
|
2012-11-14 09:09:02 +00:00
|
|
|
{ },
|
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
|
|
|
|
|
|
static struct hv_driver balloon_drv = {
|
|
|
|
.name = "hv_balloon",
|
|
|
|
.id_table = id_table,
|
|
|
|
.probe = balloon_probe,
|
|
|
|
.remove = balloon_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init init_balloon_drv(void)
|
|
|
|
{
|
|
|
|
|
|
|
|
return vmbus_driver_register(&balloon_drv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void exit_balloon_drv(void)
|
|
|
|
{
|
|
|
|
|
|
|
|
vmbus_driver_unregister(&balloon_drv);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(init_balloon_drv);
|
|
|
|
module_exit(exit_balloon_drv);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Hyper-V Balloon");
|
|
|
|
MODULE_VERSION(HV_DRV_VERSION);
|
|
|
|
MODULE_LICENSE("GPL");
|