diff options
Diffstat (limited to 'arch/x86/xen/setup.c')
| -rw-r--r-- | arch/x86/xen/setup.c | 51 |
1 files changed, 26 insertions, 25 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 0d7f881..b096d02 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -663,37 +663,35 @@ static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src, /* * Reserve Xen mfn_list. - * See comment above "struct start_info" in <xen/interface/xen.h> - * We tried to make the the memblock_reserve more selective so - * that it would be clear what region is reserved. Sadly we ran - * in the problem wherein on a 64-bit hypervisor with a 32-bit - * initial domain, the pt_base has the cr3 value which is not - * neccessarily where the pagetable starts! As Jan put it: " - * Actually, the adjustment turns out to be correct: The page - * tables for a 32-on-64 dom0 get allocated in the order "first L1", - * "first L2", "first L3", so the offset to the page table base is - * indeed 2. When reading xen/include/public/xen.h's comment - * very strictly, this is not a violation (since there nothing is said - * that the first thing in the page table space is pointed to by - * pt_base; I admit that this seems to be implied though, namely - * do I think that it is implied that the page table space is the - * range [pt_base, pt_base + nt_pt_frames), whereas that - * range here indeed is [pt_base - 2, pt_base - 2 + nt_pt_frames), - * which - without a priori knowledge - the kernel would have - * difficulty to figure out)." - so lets just fall back to the - * easy way and reserve the whole region. */ static void __init xen_reserve_xen_mfnlist(void) { + phys_addr_t start, size; + if (xen_start_info->mfn_list >= __START_KERNEL_map) { - memblock_reserve(__pa(xen_start_info->mfn_list), - xen_start_info->pt_base - - xen_start_info->mfn_list); + start = __pa(xen_start_info->mfn_list); + size = PFN_ALIGN(xen_start_info->nr_pages * + sizeof(unsigned long)); + } else { + start = PFN_PHYS(xen_start_info->first_p2m_pfn); + size = PFN_PHYS(xen_start_info->nr_p2m_frames); + } + + if (!xen_is_e820_reserved(start, size)) { + memblock_reserve(start, size); return; } - memblock_reserve(PFN_PHYS(xen_start_info->first_p2m_pfn), - PFN_PHYS(xen_start_info->nr_p2m_frames)); +#ifdef CONFIG_X86_32 + /* + * Relocating the p2m on 32 bit system to an arbitrary virtual address + * is not supported, so just give up. + */ + xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n"); + BUG(); +#else + xen_relocate_p2m(); +#endif } /** @@ -895,7 +893,10 @@ char * __init xen_auto_xlated_memory_setup(void) e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size, xen_e820_map[i].type); - xen_reserve_xen_mfnlist(); + /* Remove p2m info, it is not needed. */ + xen_start_info->mfn_list = 0; + xen_start_info->first_p2m_pfn = 0; + xen_start_info->nr_p2m_frames = 0; return "Xen"; } |