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x86/xen: populate boot_params with EDD data
During early setup of a dom0 kernel, populate boot_params with the Enhanced Disk Drive (EDD) and MBR signature data. This makes information on the BIOS boot device available in /sys/firmware/edd/. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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1 changed files with 52 additions and 0 deletions
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@ -31,6 +31,7 @@
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#include <linux/pci.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/edd.h>
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#include <xen/xen.h>
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#include <xen/events.h>
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@ -1306,6 +1307,55 @@ static const struct machine_ops xen_machine_ops __initconst = {
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.emergency_restart = xen_emergency_restart,
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};
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static void __init xen_boot_params_init_edd(void)
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{
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#if IS_ENABLED(CONFIG_EDD)
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struct xen_platform_op op;
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struct edd_info *edd_info;
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u32 *mbr_signature;
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unsigned nr;
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int ret;
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edd_info = boot_params.eddbuf;
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mbr_signature = boot_params.edd_mbr_sig_buffer;
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op.cmd = XENPF_firmware_info;
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op.u.firmware_info.type = XEN_FW_DISK_INFO;
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for (nr = 0; nr < EDDMAXNR; nr++) {
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struct edd_info *info = edd_info + nr;
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op.u.firmware_info.index = nr;
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info->params.length = sizeof(info->params);
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set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
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&info->params);
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ret = HYPERVISOR_dom0_op(&op);
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if (ret)
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break;
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#define C(x) info->x = op.u.firmware_info.u.disk_info.x
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C(device);
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C(version);
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C(interface_support);
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C(legacy_max_cylinder);
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C(legacy_max_head);
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C(legacy_sectors_per_track);
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#undef C
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}
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boot_params.eddbuf_entries = nr;
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op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
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for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
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op.u.firmware_info.index = nr;
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ret = HYPERVISOR_dom0_op(&op);
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if (ret)
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break;
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mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
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}
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boot_params.edd_mbr_sig_buf_entries = nr;
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#endif
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}
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/*
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* Set up the GDT and segment registers for -fstack-protector. Until
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* we do this, we have to be careful not to call any stack-protected
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@ -1508,6 +1558,8 @@ asmlinkage void __init xen_start_kernel(void)
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/* Avoid searching for BIOS MP tables */
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x86_init.mpparse.find_smp_config = x86_init_noop;
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x86_init.mpparse.get_smp_config = x86_init_uint_noop;
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xen_boot_params_init_edd();
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}
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#ifdef CONFIG_PCI
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/* PCI BIOS service won't work from a PV guest. */
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