From: Juergen Gross Date: Wed, 17 Sep 2014 04:12:36 +0000 (+0200) Subject: xen: eliminate scalability issues from initrd handling X-Git-Tag: v3.18-rc1~89^2~4 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=d1e9abd630fe66046087f6501a4e4b8de55f7ab9;p=uclinux-h8%2Flinux.git xen: eliminate scalability issues from initrd handling Size restrictions native kernels wouldn't have resulted from the initrd getting mapped into the initial mapping. The kernel doesn't really need the initrd to be mapped, so use infrastructure available in Xen to avoid the mapping and hence the restriction. Signed-off-by: Juergen Gross Signed-off-by: David Vrabel --- diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index be1cff572ccf..f7e01fa1545f 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1519,6 +1519,7 @@ static void __init xen_pvh_early_guest_init(void) asmlinkage __visible void __init xen_start_kernel(void) { struct physdev_set_iopl set_iopl; + unsigned long initrd_start = 0; int rc; if (!xen_start_info) @@ -1665,10 +1666,16 @@ asmlinkage __visible void __init xen_start_kernel(void) new_cpu_data.x86_capability[0] = cpuid_edx(1); #endif + if (xen_start_info->mod_start) { + if (xen_start_info->flags & SIF_MOD_START_PFN) + initrd_start = PFN_PHYS(xen_start_info->mod_start); + else + initrd_start = __pa(xen_start_info->mod_start); + } + /* Poke various useful things into boot_params */ boot_params.hdr.type_of_loader = (9 << 4) | 0; - boot_params.hdr.ramdisk_image = xen_start_info->mod_start - ? __pa(xen_start_info->mod_start) : 0; + boot_params.hdr.ramdisk_image = initrd_start; boot_params.hdr.ramdisk_size = xen_start_info->mod_len; boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S index 485b69585540..46408e51c1dc 100644 --- a/arch/x86/xen/xen-head.S +++ b/arch/x86/xen/xen-head.S @@ -124,6 +124,7 @@ NEXT_HYPERCALL(arch_6) ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .quad _PAGE_PRESENT; .quad _PAGE_PRESENT) ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1) + ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1) ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START) ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)