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Smith" To: xen-devel@lists.xenproject.org Cc: "Daniel P. Smith" , jason.andryuk@amd.com, christopher.w.clark@gmail.com, stefano.stabellini@amd.com, Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v7 03/38] x86/boot: move headroom to boot modules Date: Sun, 20 Oct 2024 20:45:38 -0400 Message-Id: <20241021004613.18793-4-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20241021004613.18793-1-dpsmith@apertussolutions.com> References: <20241021004613.18793-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-ZohoMail-DKIM: pass (identity dpsmith@apertussolutions.com) X-ZM-MESSAGEID: 1729471635325116600 Content-Type: text/plain; charset="utf-8" The purpose of struct boot_module is to encapsulate the state of boot modul= e as it is processed by Xen. Locating boot module state struct boot_module reduc= es the number of global variables as well as the number of state variables that must be passed around. It also lays the groundwork for hyperlaunch mult-dom= ain construction, where multiple instances of state variables like headroom wil= l be needed. Signed-off-by: Daniel P. Smith Reviewed-by: Jason Andryuk --- Changes since v6: - add blank line to separate comment from line above it Changes since v5: - reword and expand comment on headroom - consolidated declaration and assignment --- xen/arch/x86/include/asm/bootinfo.h | 14 ++++++++++++++ xen/arch/x86/setup.c | 21 ++++++++++++--------- 2 files changed, 26 insertions(+), 9 deletions(-) diff --git a/xen/arch/x86/include/asm/bootinfo.h b/xen/arch/x86/include/asm= /bootinfo.h index ffa443406747..59e6696f9671 100644 --- a/xen/arch/x86/include/asm/bootinfo.h +++ b/xen/arch/x86/include/asm/bootinfo.h @@ -17,6 +17,20 @@ struct boot_module { /* Transitionary only */ module_t *mod; + + /* + * A boot module may contain a compressed kernel that will require + * additional space, before the module data, into which the kernel wil= l be + * decompressed. + * + * Memory layout at boot: + * [ compressed kernel ] + * After boot module relocation: + * [ estimated headroom + PAGE_SIZE rounding ][ compressed kernel ] + * After kernel decompression: + * [ decompressed kernel ][ unused rounding ] + */ + unsigned long headroom; }; =20 /* diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c index 1eafa0a61e0e..48809aa94451 100644 --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -1028,7 +1028,7 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) struct boot_info *bi; multiboot_info_t *mbi; module_t *mod; - unsigned long nr_pages, raw_max_page, modules_headroom, module_map[1]; + unsigned long nr_pages, raw_max_page, module_map[1]; int i, j, e820_warn =3D 0, bytes =3D 0; unsigned long eb_start, eb_end; bool acpi_boot_table_init_done =3D false, relocated =3D false; @@ -1394,7 +1394,10 @@ void asmlinkage __init noreturn __start_xen(unsigned= long mbi_p) mod[bi->nr_modules].mod_end =3D __2M_rwdata_end - _stext; } =20 - modules_headroom =3D bzimage_headroom(bootstrap_map(mod), mod->mod_end= ); + bi->mods[0].headroom =3D + bzimage_headroom(bootstrap_map(bi->mods[0].mod), + bi->mods[0].mod->mod_end); + bootstrap_map(NULL); =20 #ifndef highmem_start @@ -1479,8 +1482,8 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) * decompressor overheads of mod[0] (the dom0 kernel). When we * move mod[0], we incorporate this as extra space at the star= t. */ - unsigned long headroom =3D j ? 0 : modules_headroom; - unsigned long size =3D PAGE_ALIGN(headroom + mod[j].mod_end); + struct boot_module *bm =3D &bi->mods[j]; + unsigned long size =3D PAGE_ALIGN(bm->headroom + mod[j].mod_en= d); =20 if ( mod[j].reserved ) continue; @@ -1493,14 +1496,14 @@ void asmlinkage __init noreturn __start_xen(unsigne= d long mbi_p) continue; =20 if ( s < end && - (headroom || + (bm->headroom || ((end - size) >> PAGE_SHIFT) > mod[j].mod_start) ) { - move_memory(end - size + headroom, + move_memory(end - size + bm->headroom, (uint64_t)mod[j].mod_start << PAGE_SHIFT, mod[j].mod_end); mod[j].mod_start =3D (end - size) >> PAGE_SHIFT; - mod[j].mod_end +=3D headroom; + mod[j].mod_end +=3D bm->headroom; mod[j].reserved =3D 1; } } @@ -1527,7 +1530,7 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) #endif } =20 - if ( modules_headroom && !mod->reserved ) + if ( bi->mods[0].headroom && !mod->reserved ) panic("Not enough memory to relocate the dom0 kernel image\n"); for ( i =3D 0; i < bi->nr_modules; ++i ) { @@ -2079,7 +2082,7 @@ void asmlinkage __init noreturn __start_xen(unsigned = long mbi_p) * We're going to setup domain0 using the module(s) that we stashed sa= fely * above our heap. The second module, if present, is an initrd ramdisk. */ - dom0 =3D create_dom0(mod, modules_headroom, + dom0 =3D create_dom0(mod, bi->mods[0].headroom, initrdidx < bi->nr_modules ? mod + initrdidx : NULL, kextra, bi->loader); if ( !dom0 ) --=20 2.30.2