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Drivers: hv: balloon: Support status report for larger page sizes

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DM_STATUS_REPORT expects the numbers of pages in the unit of 4k pages
(HV_HYP_PAGE) instead of guest pages, so to make it work when guest page
sizes are larger than 4k, convert the numbers of guest pages into the
numbers of HV_HYP_PAGEs.

Note that the numbers of guest pages are still used for tracing because
tracing is internal to the guest kernel.

Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220325023212.1570049-2-boqun.feng@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Boqun Feng 2022-03-25 10:32:11 +08:00 committed by Wei Liu
parent b6cae15b57
commit b3d6dd09ff
1 changed files with 10 additions and 3 deletions
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13
drivers/hv/hv_balloon.c
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@ -17,6 +17,7 @@
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/completion.h>
#include <linux/count_zeros.h>
#include <linux/memory_hotplug.h>
#include <linux/memory.h>
#include <linux/notifier.h>
@ -1130,6 +1131,7 @@ static void post_status(struct hv_dynmem_device *dm)
struct dm_status status;
unsigned long now = jiffies;
unsigned long last_post = last_post_time;
unsigned long num_pages_avail, num_pages_committed;
if (pressure_report_delay > 0) {
--pressure_report_delay;
@ -1154,16 +1156,21 @@ static void post_status(struct hv_dynmem_device *dm)
* num_pages_onlined) as committed to the host, otherwise it can try
* asking us to balloon them out.
*/
status.num_avail = si_mem_available();
status.num_committed = vm_memory_committed() +
num_pages_avail = si_mem_available();
num_pages_committed = vm_memory_committed() +
dm->num_pages_ballooned +
(dm->num_pages_added > dm->num_pages_onlined ?
dm->num_pages_added - dm->num_pages_onlined : 0) +
compute_balloon_floor();
trace_balloon_status(status.num_avail, status.num_committed,
trace_balloon_status(num_pages_avail, num_pages_committed,
vm_memory_committed(), dm->num_pages_ballooned,
dm->num_pages_added, dm->num_pages_onlined);
/* Convert numbers of pages into numbers of HV_HYP_PAGEs. */
status.num_avail = num_pages_avail * NR_HV_HYP_PAGES_IN_PAGE;
status.num_committed = num_pages_committed * NR_HV_HYP_PAGES_IN_PAGE;
/*
* If our transaction ID is no longer current, just don't
* send the status. This can happen if we were interrupted