[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] kexec: add more pages to v1 environment
Destination pages need mappings to be added to the page tables in the v1 case (where nothing else calls machine_kexec_add_page() for them). Further, without the tools mapping the low 1Mb (expected by at least some Linux version), we need to do so in the hypervisor in the v1 case. Suggested-by: David Vrabel <david.vrabel@xxxxxxxxxx> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Tested-by: Alan Robinson <alan.robinson@xxxxxxxxxxxxxx> --- a/xen/common/kexec.c +++ b/xen/common/kexec.c @@ -1003,6 +1003,24 @@ static int kexec_do_load_v1(xen_kexec_lo if ( ret < 0 ) goto error; + if ( arch == EM_386 || arch == EM_X86_64 ) + { + /* + * Ensure 0 - 1 MiB is mapped and accessible by the image. + * + * This allows access to VGA memory and the region purgatory copies + * in the crash case. + */ + unsigned long addr; + + for ( addr = 0; addr < (1UL << 20); addr += PAGE_SIZE ) + { + ret = machine_kexec_add_page(kimage, addr, addr); + if ( ret < 0 ) + goto error; + } + } + ret = kexec_load_slot(kimage); if ( ret < 0 ) goto error; --- a/xen/common/kimage.c +++ b/xen/common/kimage.c @@ -923,6 +923,11 @@ int kimage_build_ind(struct kexec_image ret = kimage_add_page(image, page_to_maddr(xen_page)); if ( ret < 0 ) goto done; + + ret = machine_kexec_add_page(image, dest, dest); + if ( ret < 0 ) + goto done; + dest += PAGE_SIZE; break; } Attachment:
kexec-v1-more-pages.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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