From d1e9abd630fe66046087f6501a4e4b8de55f7ab9 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Wed, 17 Sep 2014 06:12:36 +0200 Subject: [PATCH] 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 --- arch/x86/xen/enlighten.c | 11 +++++++++-- arch/x86/xen/xen-head.S | 1 + 2 files changed, 10 insertions(+), 2 deletions(-) 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) -- 2.11.0