From a25b9316841c5afa226f8f70a457861b35276a92 Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Tue, 22 Jan 2013 13:24:30 -0800 Subject: [PATCH] x86, mm: Make DEBUG_VIRTUAL work earlier in boot The KVM code has some repeated bugs in it around use of __pa() on per-cpu data. Those data are not in an area on which using __pa() is valid. However, they are also called early enough in boot that __vmalloc_start_set is not set, and thus the CONFIG_DEBUG_VIRTUAL debugging does not catch them. This adds a check to also verify __pa() calls against max_low_pfn, which we can use earler in boot than is_vmalloc_addr(). However, if we are super-early in boot, max_low_pfn=0 and this will trip on every call, so also make sure that max_low_pfn is set before we try to use it. With this patch applied, CONFIG_DEBUG_VIRTUAL will actually catch the bug I was chasing (and fix later in this series). I'd love to find a generic way so that any __pa() call on percpu areas could do a BUG_ON(), but there don't appear to be any nice and easy ways to check if an address is a percpu one. Anybody have ideas on a way to do this? Signed-off-by: Dave Hansen Link: http://lkml.kernel.org/r/20130122212430.F46F8159@kernel.stglabs.ibm.com Signed-off-by: H. Peter Anvin --- arch/x86/mm/numa.c | 2 +- arch/x86/mm/pat.c | 4 ++-- arch/x86/mm/physaddr.c | 9 ++++++++- 3 files changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 2d125be1bae9..76604eb9e4b0 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -219,7 +219,7 @@ static void __init setup_node_data(int nid, u64 start, u64 end) */ nd = alloc_remap(nid, nd_size); if (nd) { - nd_pa = __pa(nd); + nd_pa = __phys_addr_nodebug(nd); remapped = true; } else { nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid); diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 0eb572eda406..2610bd93c896 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -560,10 +560,10 @@ int kernel_map_sync_memtype(u64 base, unsigned long size, unsigned long flags) { unsigned long id_sz; - if (base >= __pa(high_memory)) + if (base > __pa(high_memory-1)) return 0; - id_sz = (__pa(high_memory) < base + size) ? + id_sz = (__pa(high_memory-1) <= base + size) ? __pa(high_memory) - base : size; diff --git a/arch/x86/mm/physaddr.c b/arch/x86/mm/physaddr.c index c73feddd518d..e666cbbb9261 100644 --- a/arch/x86/mm/physaddr.c +++ b/arch/x86/mm/physaddr.c @@ -1,3 +1,4 @@ +#include #include #include #include @@ -68,10 +69,16 @@ EXPORT_SYMBOL(__virt_addr_valid); #ifdef CONFIG_DEBUG_VIRTUAL unsigned long __phys_addr(unsigned long x) { + unsigned long phys_addr = x - PAGE_OFFSET; /* VMALLOC_* aren't constants */ VIRTUAL_BUG_ON(x < PAGE_OFFSET); VIRTUAL_BUG_ON(__vmalloc_start_set && is_vmalloc_addr((void *) x)); - return x - PAGE_OFFSET; + /* max_low_pfn is set early, but not _that_ early */ + if (max_low_pfn) { + VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn); + BUG_ON(slow_virt_to_phys((void *)x) != phys_addr); + } + return phys_addr; } EXPORT_SYMBOL(__phys_addr); #endif -- GitLab