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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jun 2021 02:43:56.4512 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e7659ad6-78e9-4fb7-b9c9-08d9295e1896 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR03FT056.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB6211 This patch introduces static memory initialization, during system RAM boot up. New func init_staticmem_pages is responsible for static memory initialization. Helper free_staticmem_pages is the equivalent of free_heap_pages, to free nr_mfns pages of static memory. This commit defines a new helper free_page to extract common code between free_heap_pages and free_staticmem_pages, like following the same cache/TLB coherency policy. For each page, free_staticmem_pages includes the following extra steps to initialize: 1. change page state from inuse to free state and grant PGC_reserved. 2. scrub the page in need synchronously. Signed-off-by: Penny Zheng --- changes v2: - rename to nr_mfns - extract common code from free_heap_pages and free_staticmem_pages - remove dead codes in other archs, including move some to arm-specific file, and put some under CONFIG_ARM - mark free_staticmem_pages __init --- xen/arch/arm/setup.c | 27 ++++++++++++++ xen/common/page_alloc.c | 78 +++++++++++++++++++++++++++++++++-------- xen/include/xen/mm.h | 6 ++++ 3 files changed, 97 insertions(+), 14 deletions(-) diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index 00aad1c194..daafea0abb 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -611,6 +611,30 @@ static void __init init_pdx(void) } } +/* Static memory initialization */ +static void __init init_staticmem_pages(void) +{ + int bank; + + /* + * TODO: Considering NUMA-support scenario. + */ + for ( bank = 0 ; bank < bootinfo.static_mem.nr_banks; bank++ ) + { + paddr_t bank_start = bootinfo.static_mem.bank[bank].start; + paddr_t bank_size = bootinfo.static_mem.bank[bank].size; + paddr_t bank_end = bank_start + bank_size; + + bank_start = round_pgup(bank_start); + bank_end = round_pgdown(bank_end); + if ( bank_end <= bank_start ) + return; + + free_staticmem_pages(maddr_to_page(bank_start), + (bank_end - bank_start) >> PAGE_SHIFT, false); + } +} + #ifdef CONFIG_ARM_32 static void __init setup_mm(void) { @@ -872,6 +896,9 @@ void __init start_xen(unsigned long boot_phys_offset, cmdline_parse(cmdline); setup_mm(); + /* If exists, Static Memory Initialization. */ + if ( bootinfo.static_mem.nr_banks > 0 ) + init_staticmem_pages(); /* Parse the ACPI tables for possible boot-time configuration */ acpi_boot_table_init(); diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index 958ba0cd92..8c00262c04 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -1376,6 +1376,37 @@ bool scrub_free_pages(void) return node_to_scrub(false) != NUMA_NO_NODE; } +static void free_page(struct page_info *pg, bool need_scrub) +{ + mfn_t mfn = page_to_mfn(pg); + + /* If a page has no owner it will need no safety TLB flush. */ + pg->u.free.need_tlbflush = (page_get_owner(pg) != NULL); + if ( pg->u.free.need_tlbflush ) + page_set_tlbflush_timestamp(pg); + + /* This page is not a guest frame any more. */ + page_set_owner(pg, NULL); /* set_gpfn_from_mfn snoops pg owner */ + set_gpfn_from_mfn(mfn_x(mfn), INVALID_M2P_ENTRY); + +#ifdef CONFIG_ARM + if ( pg->count_info & PGC_reserved ) + { + /* TODO: asynchronous scrubbing. */ + if ( need_scrub ) + scrub_one_page(pg); + return; + } +#endif + if ( need_scrub ) + { + pg->count_info |= PGC_need_scrub; + poison_one_page(pg); + } + + return; +} + /* Free 2^@order set of pages. */ static void free_heap_pages( struct page_info *pg, unsigned int order, bool need_scrub) @@ -1425,20 +1456,7 @@ static void free_heap_pages( BUG(); } - /* If a page has no owner it will need no safety TLB flush. */ - pg[i].u.free.need_tlbflush = (page_get_owner(&pg[i]) != NULL); - if ( pg[i].u.free.need_tlbflush ) - page_set_tlbflush_timestamp(&pg[i]); - - /* This page is not a guest frame any more. */ - page_set_owner(&pg[i], NULL); /* set_gpfn_from_mfn snoops pg owner */ - set_gpfn_from_mfn(mfn_x(mfn) + i, INVALID_M2P_ENTRY); - - if ( need_scrub ) - { - pg[i].count_info |= PGC_need_scrub; - poison_one_page(&pg[i]); - } + free_page(&pg[i], need_scrub); } avail[node][zone] += 1 << order; @@ -1512,6 +1530,38 @@ static void free_heap_pages( spin_unlock(&heap_lock); } +#ifdef CONFIG_STATIC_ALLOCATION +/* Equivalent of free_heap_pages to free nr_mfns pages of static memory. */ +void __init free_staticmem_pages(struct page_info *pg, unsigned long nr_mfns, + bool need_scrub) +{ + mfn_t mfn = page_to_mfn(pg); + unsigned long i; + + for ( i = 0; i < nr_mfns; i++ ) + { + switch ( pg[i].count_info & PGC_state ) + { + case PGC_state_inuse: + BUG_ON(pg[i].count_info & PGC_broken); + /* Mark it free and reserved. */ + pg[i].count_info = PGC_state_free | PGC_reserved; + break; + + default: + printk(XENLOG_ERR + "Page state shall be only in PGC_state_inuse. " + "pg[%lu] MFN %"PRI_mfn" count_info=%#lx tlbflush_timestamp=%#x.\n", + i, mfn_x(mfn) + i, + pg[i].count_info, + pg[i].tlbflush_timestamp); + BUG(); + } + + free_page(&pg[i], need_scrub); + } +} +#endif /* * Following rules applied for page offline: diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h index 667f9dac83..df25e55966 100644 --- a/xen/include/xen/mm.h +++ b/xen/include/xen/mm.h @@ -85,6 +85,12 @@ bool scrub_free_pages(void); } while ( false ) #define FREE_XENHEAP_PAGE(p) FREE_XENHEAP_PAGES(p, 0) +#ifdef CONFIG_ARM +/* Static Allocation */ +void free_staticmem_pages(struct page_info *pg, unsigned long nr_mfns, + bool need_scrub); +#endif + /* Map machine page range in Xen virtual address space. */ int map_pages_to_xen( unsigned long virt, -- 2.25.1