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SUSE:SLE-12-SP4:GA
grub2.4278
0009-xen-add-capability-to-load-initrd-outside-...
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File 0009-xen-add-capability-to-load-initrd-outside-of-initial.patch of Package grub2.4278
From 9c7798d3bed807f29a7056bac5bd8c4b0f33ca34 Mon Sep 17 00:00:00 2001 From: Juergen Gross <jgross@suse.com> Date: Thu, 3 Mar 2016 10:38:14 +0100 Subject: [PATCH 09/11] xen: add capability to load initrd outside of initial mapping Modern pvops linux kernels support an initrd not covered by the initial mapping. This capability is flagged by an elf-note. In case the elf-note is set by the kernel don't place the initrd into the initial mapping. This will allow to load larger initrds and/or support domains with larger memory, as the initial mapping is limited to 2GB and it is containing the p2m list. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> --- grub-core/loader/i386/xen.c | 60 +++++++++++++++++++++++++++++++------- grub-core/loader/i386/xen_fileXX.c | 3 ++ include/grub/xen_file.h | 1 + 3 files changed, 53 insertions(+), 11 deletions(-) diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c index 2e12763..9639ca1 100644 --- a/grub-core/loader/i386/xen.c +++ b/grub-core/loader/i386/xen.c @@ -228,6 +228,9 @@ grub_xen_p2m_alloc (void) grub_size_t p2msize; grub_err_t err; + if (xen_state.virt_mfn_list) + return GRUB_ERR_NONE; + xen_state.state.mfn_list = xen_state.max_addr; xen_state.next_start.mfn_list = xen_state.max_addr + xen_state.xen_inf.virt_base; @@ -250,6 +253,9 @@ grub_xen_special_alloc (void) grub_relocator_chunk_t ch; grub_err_t err; + if (xen_state.virt_start_info) + return GRUB_ERR_NONE; + err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, xen_state.max_addr, sizeof (xen_state.next_start)); @@ -281,6 +287,9 @@ grub_xen_pt_alloc (void) grub_uint64_t nr_info_pages; grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages; + if (xen_state.virt_pgtable) + return GRUB_ERR_NONE; + xen_state.next_start.pt_base = xen_state.max_addr + xen_state.xen_inf.virt_base; xen_state.state.paging_start = xen_state.max_addr >> PAGE_SHIFT; @@ -319,16 +328,11 @@ grub_xen_pt_alloc (void) return GRUB_ERR_NONE; } +/* Allocate all not yet allocated areas mapped by initial page tables. */ static grub_err_t -grub_xen_boot (void) +grub_xen_alloc_boot_data (void) { grub_err_t err; - grub_uint64_t nr_pages; - struct gnttab_set_version gnttab_setver; - grub_size_t i; - - if (grub_xen_n_allocated_shared_pages) - return grub_error (GRUB_ERR_BUG, "active grants"); err = grub_xen_p2m_alloc (); if (err) @@ -340,6 +344,24 @@ grub_xen_boot (void) if (err) return err; + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_xen_boot (void) +{ + grub_err_t err; + grub_uint64_t nr_pages; + struct gnttab_set_version gnttab_setver; + grub_size_t i; + + if (grub_xen_n_allocated_shared_pages) + return grub_error (GRUB_ERR_BUG, "active grants"); + + err = grub_xen_alloc_boot_data (); + if (err) + return err; + err = set_mfns (xen_state.console_pfn); if (err) return err; @@ -610,6 +632,13 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), goto fail; } + if (xen_state.xen_inf.unmapped_initrd) + { + err = grub_xen_alloc_boot_data (); + if (err) + goto fail; + } + if (grub_initrd_init (argc, argv, &initrd_ctx)) goto fail; @@ -627,14 +656,22 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), goto fail; } - xen_state.next_start.mod_start = - xen_state.max_addr + xen_state.xen_inf.virt_base; xen_state.next_start.mod_len = size; - xen_state.max_addr = ALIGN_UP (xen_state.max_addr + size, PAGE_SIZE); + if (xen_state.xen_inf.unmapped_initrd) + { + xen_state.next_start.flags |= SIF_MOD_START_PFN; + xen_state.next_start.mod_start = xen_state.max_addr >> PAGE_SHIFT; + } + else + xen_state.next_start.mod_start = + xen_state.max_addr + xen_state.xen_inf.virt_base; grub_dprintf ("xen", "Initrd, addr=0x%x, size=0x%x\n", - (unsigned) xen_state.next_start.mod_start, (unsigned) size); + (unsigned) (xen_state.max_addr + xen_state.xen_inf.virt_base), + (unsigned) size); + + xen_state.max_addr = ALIGN_UP (xen_state.max_addr + size, PAGE_SIZE); fail: grub_initrd_close (&initrd_ctx); @@ -686,6 +723,7 @@ grub_cmd_module (grub_command_t cmd __attribute__ ((unused)), if (!xen_state.module_info_page) { + xen_state.xen_inf.unmapped_initrd = 0; xen_state.n_modules = 0; xen_state.max_addr = ALIGN_UP (xen_state.max_addr, PAGE_SIZE); xen_state.modules_target_start = xen_state.max_addr; diff --git a/grub-core/loader/i386/xen_fileXX.c b/grub-core/loader/i386/xen_fileXX.c index 03215ca..8751174 100644 --- a/grub-core/loader/i386/xen_fileXX.c +++ b/grub-core/loader/i386/xen_fileXX.c @@ -261,6 +261,9 @@ parse_note (grub_elf_t elf, struct grub_xen_file_info *xi, descsz == 2 ? 2 : 3) == 0) xi->arch = GRUB_XEN_FILE_I386; break; + case XEN_ELFNOTE_MOD_START_PFN: + xi->unmapped_initrd = !!grub_le_to_cpu32(*(grub_uint32_t *) desc); + break; default: grub_dprintf ("xen", "unknown note type %d\n", nh->n_type); break; diff --git a/include/grub/xen_file.h b/include/grub/xen_file.h index 4b2ccba..ed749fa 100644 --- a/include/grub/xen_file.h +++ b/include/grub/xen_file.h @@ -36,6 +36,7 @@ struct grub_xen_file_info int has_note; int has_xen_guest; int extended_cr3; + int unmapped_initrd; enum { GRUB_XEN_FILE_I386 = 1, -- 2.6.6
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