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55e593f1-x86-NUMA-make-init_node_heap-respect-X...
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File 55e593f1-x86-NUMA-make-init_node_heap-respect-Xen-heap-limit.patch of Package xen
# Commit 88e3ed61642bb393458acc7a9bd2f96edc337190 # Date 2015-09-01 14:02:57 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86/NUMA: make init_node_heap() respect Xen heap limit On NUMA systems, where we try to use node local memory for the basic control structures of the buddy allocator, this special case needs to take into consideration a possible address width limit placed on the Xen heap. In turn this (but also other, more abstract considerations) requires that xenheap_max_mfn() not be called more than once (at most we might permit it to be called a second time with a larger value than was passed the first time), and be called only before calling end_boot_allocator(). While inspecting all the involved code, a couple of off-by-one issues were found (and are being corrected here at once): - arch_init_memory() cleared one too many page table slots - the highmem_start based invocation of xenheap_max_mfn() passed too big a value - xenheap_max_mfn() calculated the wrong bit count in edge cases Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> # Commit 0a7167d9b20cdc48e6ea320fbbb920b3267c9757 # Date 2015-09-04 14:58:07 +0100 # Author Julien Grall <julien.grall@citrix.com> # Committer Ian Campbell <ian.campbell@citrix.com> xen/arm64: do not (incorrectly) limit size of xenheap The commit 88e3ed61642bb393458acc7a9bd2f96edc337190 "x86/NUMA: make init_node_heap() respect Xen heap limit" breaks boot on the arm64 board X-Gene. The xenheap bits variable is used to know the last RAM MFN always mapped in Xen virtual memory. If the value is 0, it means that all the memory is always mapped in Xen virtual memory. On X-gene the RAM bank resides above 128GB and last xenheap MFN is 0x4400000. With the new way to calculate the number of bits, xenheap_bits will be equal to 38 bits. This will result to hide all the RAM and the impossibility to allocate xenheap memory. Given that aarch64 have always all the memory mapped in Xen virtual memory, it's not necessary to call xenheap_max_mfn which set the number of bits. Suggested-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Julien Grall <julien.grall@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -664,7 +664,6 @@ static void __init setup_mm(unsigned lon xenheap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start; xenheap_mfn_start = ram_start >> PAGE_SHIFT; xenheap_mfn_end = ram_end >> PAGE_SHIFT; - xenheap_max_mfn(xenheap_mfn_end); /* * Need enough mapped pages for copying the DTB. --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -372,7 +372,7 @@ void __init arch_init_memory(void) for ( i = 0; i < l3_table_offset(split_va); ++i ) l3tab[i] = l3idle[i]; - for ( ; i <= L3_PAGETABLE_ENTRIES; ++i ) + for ( ; i < L3_PAGETABLE_ENTRIES; ++i ) l3tab[i] = l3e_empty(); split_l4e = l4e_from_pfn(virt_to_mfn(l3tab), __PAGE_HYPERVISOR); --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -970,7 +970,7 @@ void __init noreturn __start_xen(unsigne setup_max_pdx(raw_max_page); if ( highmem_start ) - xenheap_max_mfn(PFN_DOWN(highmem_start)); + xenheap_max_mfn(PFN_DOWN(highmem_start - 1)); /* * Walk every RAM region and map it in its entirety (on x86/64, at least) @@ -1151,9 +1151,6 @@ void __init noreturn __start_xen(unsigne numa_initmem_init(0, raw_max_page); - end_boot_allocator(); - system_state = SYS_STATE_boot; - if ( max_page - 1 > virt_to_mfn(HYPERVISOR_VIRT_END - 1) ) { unsigned long limit = virt_to_mfn(HYPERVISOR_VIRT_END - 1); @@ -1162,6 +1159,8 @@ void __init noreturn __start_xen(unsigne if ( !highmem_start ) xenheap_max_mfn(limit); + end_boot_allocator(); + /* Pass the remaining memory to the allocator. */ for ( i = 0; i < boot_e820.nr_map; i++ ) { @@ -1185,6 +1184,10 @@ void __init noreturn __start_xen(unsigne opt_tmem = 0; } } + else + end_boot_allocator(); + + system_state = SYS_STATE_boot; vm_init(); console_init_ring(); --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -405,13 +405,19 @@ void get_outstanding_claims(uint64_t *fr spin_unlock(&heap_lock); } +static bool_t __read_mostly first_node_initialised; +#ifndef CONFIG_SEPARATE_XENHEAP +static unsigned int __read_mostly xenheap_bits; +#else +#define xenheap_bits 0 +#endif + static unsigned long init_node_heap(int node, unsigned long mfn, unsigned long nr, bool_t *use_tail) { /* First node to be discovered has its heap metadata statically alloced. */ static heap_by_zone_and_order_t _heap_static; static unsigned long avail_static[NR_ZONES]; - static int first_node_initialised; unsigned long needed = (sizeof(**_heap) + sizeof(**avail) * NR_ZONES + PAGE_SIZE - 1) >> PAGE_SHIFT; @@ -429,14 +435,18 @@ static unsigned long init_node_heap(int } #ifdef DIRECTMAP_VIRT_END else if ( *use_tail && nr >= needed && - (mfn + nr) <= (virt_to_mfn(eva - 1) + 1) ) + (mfn + nr) <= (virt_to_mfn(eva - 1) + 1) && + (!xenheap_bits || + !((mfn + nr - 1) >> (xenheap_bits - PAGE_SHIFT))) ) { _heap[node] = mfn_to_virt(mfn + nr - needed); avail[node] = mfn_to_virt(mfn + nr - 1) + PAGE_SIZE - sizeof(**avail) * NR_ZONES; } else if ( nr >= needed && - (mfn + needed) <= (virt_to_mfn(eva - 1) + 1) ) + (mfn + needed) <= (virt_to_mfn(eva - 1) + 1) && + (!xenheap_bits || + !((mfn + needed - 1) >> (xenheap_bits - PAGE_SHIFT))) ) { _heap[node] = mfn_to_virt(mfn); avail[node] = mfn_to_virt(mfn + needed - 1) + @@ -1541,11 +1551,13 @@ void free_xenheap_pages(void *v, unsigne #else -static unsigned int __read_mostly xenheap_bits; - void __init xenheap_max_mfn(unsigned long mfn) { - xenheap_bits = fls(mfn) + PAGE_SHIFT; + ASSERT(!first_node_initialised); + ASSERT(!xenheap_bits); + BUILD_BUG_ON(PADDR_BITS >= BITS_PER_LONG); + xenheap_bits = min(fls(mfn + 1) - 1 + PAGE_SHIFT, PADDR_BITS); + printk(XENLOG_INFO "Xen heap: %u bits\n", xenheap_bits); } void init_xenheap_pages(paddr_t ps, paddr_t pe)
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