diff options
Diffstat (limited to 'drivers/hv/hv_balloon.c')
| -rw-r--r-- | drivers/hv/hv_balloon.c | 96 |
1 files changed, 74 insertions, 22 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index fdf6decacf06..cbe43e2567a7 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -469,12 +469,16 @@ static bool do_hot_add; * the specified number of seconds. */ static uint pressure_report_delay = 45; +extern unsigned int page_reporting_order; +#define HV_MAX_FAILURES 2 /* * The last time we posted a pressure report to host. */ static unsigned long last_post_time; +static int hv_hypercall_multi_failure; + module_param(hot_add, bool, (S_IRUGO | S_IWUSR)); MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add"); @@ -579,6 +583,10 @@ static struct hv_dynmem_device dm_device; static void post_status(struct hv_dynmem_device *dm); +static void enable_page_reporting(void); + +static void disable_page_reporting(void); + #ifdef CONFIG_MEMORY_HOTPLUG static inline bool has_pfn_is_backed(struct hv_hotadd_state *has, unsigned long pfn) @@ -905,7 +913,7 @@ static unsigned long handle_pg_range(unsigned long pg_start, * We have some residual hot add range * that needs to be hot added; hot add * it now. Hot add a multiple of - * of HA_CHUNK that fully covers the pages + * HA_CHUNK that fully covers the pages * we have. */ size = (has->end_pfn - has->ha_end_pfn); @@ -1418,6 +1426,18 @@ static int dm_thread_func(void *dm_dev) */ reinit_completion(&dm_device.config_event); post_status(dm); + /* + * disable free page reporting if multiple hypercall + * failure flag set. It is not done in the page_reporting + * callback context as that causes a deadlock between + * page_reporting_process() and page_reporting_unregister() + */ + if (hv_hypercall_multi_failure >= HV_MAX_FAILURES) { + pr_err("Multiple failures in cold memory discard hypercall, disabling page reporting\n"); + disable_page_reporting(); + /* Reset the flag after disabling reporting */ + hv_hypercall_multi_failure = 0; + } } return 0; @@ -1593,20 +1613,20 @@ static void balloon_onchannelcallback(void *context) } -/* Hyper-V only supports reporting 2MB pages or higher */ -#define HV_MIN_PAGE_REPORTING_ORDER 9 -#define HV_MIN_PAGE_REPORTING_LEN (HV_HYP_PAGE_SIZE << HV_MIN_PAGE_REPORTING_ORDER) +#define HV_LARGE_REPORTING_ORDER 9 +#define HV_LARGE_REPORTING_LEN (HV_HYP_PAGE_SIZE << \ + HV_LARGE_REPORTING_ORDER) static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info, struct scatterlist *sgl, unsigned int nents) { unsigned long flags; struct hv_memory_hint *hint; - int i; + int i, order; u64 status; struct scatterlist *sg; WARN_ON_ONCE(nents > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); - WARN_ON_ONCE(sgl->length < HV_MIN_PAGE_REPORTING_LEN); + WARN_ON_ONCE(sgl->length < (HV_HYP_PAGE_SIZE << page_reporting_order)); local_irq_save(flags); hint = *(struct hv_memory_hint **)this_cpu_ptr(hyperv_pcpu_input_arg); if (!hint) { @@ -1621,21 +1641,53 @@ static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info, range = &hint->ranges[i]; range->address_space = 0; - /* page reporting only reports 2MB pages or higher */ - range->page.largepage = 1; - range->page.additional_pages = - (sg->length / HV_MIN_PAGE_REPORTING_LEN) - 1; - range->page_size = HV_GPA_PAGE_RANGE_PAGE_SIZE_2MB; - range->base_large_pfn = - page_to_hvpfn(sg_page(sg)) >> HV_MIN_PAGE_REPORTING_ORDER; + order = get_order(sg->length); + /* + * Hyper-V expects the additional_pages field in the units + * of one of these 3 sizes, 4Kbytes, 2Mbytes or 1Gbytes. + * This is dictated by the values of the fields page.largesize + * and page_size. + * This code however, only uses 4Kbytes and 2Mbytes units + * and not 1Gbytes unit. + */ + + /* page reporting for pages 2MB or higher */ + if (order >= HV_LARGE_REPORTING_ORDER ) { + range->page.largepage = 1; + range->page_size = HV_GPA_PAGE_RANGE_PAGE_SIZE_2MB; + range->base_large_pfn = page_to_hvpfn( + sg_page(sg)) >> HV_LARGE_REPORTING_ORDER; + range->page.additional_pages = + (sg->length / HV_LARGE_REPORTING_LEN) - 1; + } else { + /* Page reporting for pages below 2MB */ + range->page.basepfn = page_to_hvpfn(sg_page(sg)); + range->page.largepage = false; + range->page.additional_pages = + (sg->length / HV_HYP_PAGE_SIZE) - 1; + } + } status = hv_do_rep_hypercall(HV_EXT_CALL_MEMORY_HEAT_HINT, nents, 0, hint, NULL); local_irq_restore(flags); - if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) { + if (!hv_result_success(status)) { + pr_err("Cold memory discard hypercall failed with status %llx\n", - status); + status); + if (hv_hypercall_multi_failure > 0) + hv_hypercall_multi_failure++; + + if (hv_result(status) == HV_STATUS_INVALID_PARAMETER) { + pr_err("Underlying Hyper-V does not support order less than 9. Hypercall failed\n"); + pr_err("Defaulting to page_reporting_order %d\n", + pageblock_order); + page_reporting_order = pageblock_order; + hv_hypercall_multi_failure++; + return -EINVAL; + } + return -EINVAL; } @@ -1646,12 +1698,6 @@ static void enable_page_reporting(void) { int ret; - /* Essentially, validating 'PAGE_REPORTING_MIN_ORDER' is big enough. */ - if (pageblock_order < HV_MIN_PAGE_REPORTING_ORDER) { - pr_debug("Cold memory discard is only supported on 2MB pages and above\n"); - return; - } - if (!hv_query_ext_cap(HV_EXT_CAPABILITY_MEMORY_COLD_DISCARD_HINT)) { pr_debug("Cold memory discard hint not supported by Hyper-V\n"); return; @@ -1659,12 +1705,18 @@ static void enable_page_reporting(void) BUILD_BUG_ON(PAGE_REPORTING_CAPACITY > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); dm_device.pr_dev_info.report = hv_free_page_report; + /* + * We let the page_reporting_order parameter decide the order + * in the page_reporting code + */ + dm_device.pr_dev_info.order = 0; ret = page_reporting_register(&dm_device.pr_dev_info); if (ret < 0) { dm_device.pr_dev_info.report = NULL; pr_err("Failed to enable cold memory discard: %d\n", ret); } else { - pr_info("Cold memory discard hint enabled\n"); + pr_info("Cold memory discard hint enabled with order %d\n", + page_reporting_order); } } |