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([185.25.64.249]) by mx.google.com with ESMTPSA id a43sm42736941eep.9.1969.12.31.16.00.00 (version=TLSv1.2 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 16 Sep 2013 08:20:11 -0700 (PDT) From: Julien Grall To: xen-devel@lists.xen.org Cc: stefano.stabellini@eu.citrix.com, ian.campbell@citrix.com, patches@linaro.org, andre.przywara@linaro.org, Julien Grall Subject: [PATCH 1/2] xen/arm: Add support to load initrd in dom0 Date: Mon, 16 Sep 2013 16:20:07 +0100 Message-Id: <1379344808-26917-2-git-send-email-julien.grall@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1379344808-26917-1-git-send-email-julien.grall@linaro.org> References: <1379344808-26917-1-git-send-email-julien.grall@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: julien.grall@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.128.181 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Signed-off-by: Julien Grall --- xen/arch/arm/domain_build.c | 98 ++++++++++++++++++++++++++++++++++++++----- xen/arch/arm/kernel.c | 20 +++++---- xen/arch/arm/kernel.h | 2 + 3 files changed, 102 insertions(+), 18 deletions(-) diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c index f569e31..f3bb262 100644 --- a/xen/arch/arm/domain_build.c +++ b/xen/arch/arm/domain_build.c @@ -163,12 +163,16 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo, * * * remember xen,dom0-bootargs if we don't already have * bootargs (from module #1, above). - * * remove bootargs, xen,dom0-bootargs and xen,xen-bootargs. + * * remove bootargs, xen,dom0-bootargs, xen,xen-bootargs, + * linux,initrd-start and linux,initrd-end. */ if ( dt_node_path_is_equal(np, "/chosen") ) { - if ( dt_property_name_is_equal(pp, "xen,xen-bootargs") ) + if ( dt_property_name_is_equal(pp, "xen,xen-bootargs") || + dt_property_name_is_equal(pp, "linux,initrd-start") || + dt_property_name_is_equal(pp, "linux,initrd-end") ) continue; + if ( dt_property_name_is_equal(pp, "xen,dom0-bootargs") ) { had_dom0_bootargs = 1; @@ -214,12 +218,22 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo, strlen(bootargs) + 1); if ( res ) return res; - } - /* - * XXX should populate /chosen/linux,initrd-{start,end} here if we - * have module[2] - */ + /* + * If the bootloader provides an initrd, we must create a placeholder + * for the initrd properties. The values will be replaced later. + */ + if ( early_info.modules.module[MOD_INITRD].size ) + { + res = fdt_property_cell(kinfo->fdt, "linux,initrd-start", 0); + if ( res ) + return res; + + res = fdt_property_cell(kinfo->fdt, "linux,initrd-end", 0); + if ( res ) + return res; + } + } return 0; } @@ -779,6 +793,7 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo) int new_size; int ret; paddr_t end; + paddr_t initrd_len; ASSERT(dt_host && (dt_host->sibling == NULL)); @@ -806,7 +821,8 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo) goto err; /* Actual new size */ - new_size = fdt_totalsize(kinfo->fdt); + initrd_len = early_info.modules.module[MOD_INITRD].size; + new_size = fdt_totalsize(kinfo->fdt) + initrd_len; /* * DTB must be loaded such that it does not conflict with the @@ -815,15 +831,20 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo) * the recommendation in Documentation/arm64/booting.txt is below * 512MB. Place at 128MB, (or, if we have less RAM, as high as * possible) in order to satisfy both. + * If the bootloader provides an initrd, it will be loaded just + * after the DTB. */ end = kinfo->mem.bank[0].start + kinfo->mem.bank[0].size; end = MIN(kinfo->mem.bank[0].start + (128<<20) + new_size, end); - kinfo->dtb_paddr = end - fdt_totalsize(kinfo->fdt); + kinfo->initrd_paddr = end - initrd_len; + kinfo->initrd_paddr &= ~((1 << 20) - 1); + + kinfo->dtb_paddr = kinfo->initrd_paddr - fdt_totalsize(kinfo->fdt); /* Align the address to 2Mb. Linux only requires 4 byte alignment */ kinfo->dtb_paddr &= ~((2 << 20) - 1); - if ( fdt_totalsize(kinfo->fdt) > end ) + if ( new_size > (end - kinfo->mem.bank[0].size) ) { printk(XENLOG_ERR "Not enough memory in the first bank for " "the device tree."); @@ -854,6 +875,61 @@ static void dtb_load(struct kernel_info *kinfo) xfree(kinfo->fdt); } +static void initrd_load(struct kernel_info *kinfo) +{ + paddr_t load_addr = kinfo->initrd_paddr; + paddr_t paddr = early_info.modules.module[MOD_INITRD].start; + paddr_t len = early_info.modules.module[MOD_INITRD].size; + unsigned long offs; + int node; + int res; + + if ( !len ) + return; + + printk("Loading dom0 initrd from %"PRIpaddr" to 0x%"PRIpaddr"-0x%"PRIpaddr"\n", + paddr, load_addr, load_addr + len); + + /* Fix up linux,initrd-start and linux,initrd-end in /chosen */ + node = fdt_path_offset(kinfo->fdt, "/chosen"); + if ( node < 0 ) + panic("Cannot find the /chosen node"); + + res = fdt_setprop_inplace_cell(kinfo->fdt, node, "linux,initrd-start", + load_addr); + if ( res ) + panic("Cannot fix up \"linux,initrd-start\" property\n"); + + res = fdt_setprop_inplace_cell(kinfo->fdt, node, "linux,initrd-end", + load_addr + len); + if ( res ) + panic("Cannot fix up \"linux,initrd-end\" property\n"); + + for ( offs = 0; offs < len; ) + { + int rc; + paddr_t s, l, ma; + void *dst; + + s = offs & ~PAGE_MASK; + l = min(PAGE_SIZE - s, len); + + rc = gvirt_to_maddr(load_addr + offs, &ma); + if ( rc ) + { + panic("\nUnable to translate guest address\n"); + return; + } + + dst = map_domain_page(ma>>PAGE_SHIFT); + + copy_from_paddr(dst + s, paddr + offs, l, BUFFERABLE); + + unmap_domain_page(dst); + offs += l; + } +} + int construct_dom0(struct domain *d) { struct kernel_info kinfo = {}; @@ -890,6 +966,8 @@ int construct_dom0(struct domain *d) p2m_load_VTTBR(d); kernel_load(&kinfo); + /* initrd_load will fix up the fdt, so call it before dtb_load */ + initrd_load(&kinfo); dtb_load(&kinfo); discard_initial_modules(); diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c index e4c0981..84356a1 100644 --- a/xen/arch/arm/kernel.c +++ b/xen/arch/arm/kernel.c @@ -71,15 +71,22 @@ static void kernel_zimage_check_overlap(struct kernel_info *info) { paddr_t zimage_start = info->zimage.load_addr; paddr_t zimage_end = info->zimage.load_addr + info->zimage.len; - paddr_t dtb_start = info->dtb_paddr; - paddr_t dtb_end = info->dtb_paddr + fdt_totalsize(info->fdt); + paddr_t start = info->dtb_paddr; + paddr_t end; - if ( (dtb_start > zimage_end) || (dtb_end < zimage_start) ) + end = info->initrd_paddr + early_info.modules.module[MOD_INITRD].size; + + /* + * In the dom0 memory, the initrd will be just after the DTB. So we + * only need to check if the zImage range will overlap the + * DTB-initrd range. + */ + if ( (start > zimage_end) || (end < zimage_start) ) return; panic(XENLOG_ERR "The kernel(0x%"PRIpaddr"-0x%"PRIpaddr - ") is overlapping the DTB(0x%"PRIpaddr"-0x%"PRIpaddr")\n", - zimage_start, zimage_end, dtb_start, dtb_end); + ") is overlapping the DTB-initrd(0x%"PRIpaddr"-0x%"PRIpaddr")\n", + zimage_start, zimage_end, start, end); } static void kernel_zimage_load(struct kernel_info *info) @@ -328,9 +335,6 @@ int kernel_prepare(struct kernel_info *info) paddr_t start, size; - if ( early_info.modules.nr_mods > MOD_INITRD ) - panic("Cannot handle dom0 initrd yet\n"); - if ( early_info.modules.nr_mods < MOD_KERNEL ) { printk("No boot modules found, trying flash\n"); diff --git a/xen/arch/arm/kernel.h b/xen/arch/arm/kernel.h index c900e74..debf590 100644 --- a/xen/arch/arm/kernel.h +++ b/xen/arch/arm/kernel.h @@ -21,6 +21,8 @@ struct kernel_info { paddr_t dtb_paddr; paddr_t entry; + paddr_t initrd_paddr; + void *kernel_img; unsigned kernel_order;