forked from Minki/linux
b17d9d1df3
Add pvh_get_root_pointer() for Xen PVH guests to communicate the address of the RSDP table given to the kernel via Xen start info. This makes the kernel boot again in PVH mode after on recent Xen the RSDP was moved to higher addresses. So up to that change it was pure luck that the legacy method to locate the RSDP was working when running as PVH mode. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: boris.ostrovsky@oracle.com Cc: lenb@kernel.org Cc: linux-acpi@vger.kernel.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20180219100906.14265-4-jgross@suse.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/acpi.h>
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#include <xen/hvc-console.h>
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#include <asm/io_apic.h>
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#include <asm/hypervisor.h>
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#include <asm/e820/api.h>
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#include <asm/x86_init.h>
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#include <asm/xen/interface.h>
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#include <asm/xen/hypercall.h>
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#include <xen/interface/memory.h>
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#include <xen/interface/hvm/start_info.h>
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/*
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* PVH variables.
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*
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* xen_pvh pvh_bootparams and pvh_start_info need to live in data segment
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* since they are used after startup_{32|64}, which clear .bss, are invoked.
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*/
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bool xen_pvh __attribute__((section(".data"))) = 0;
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struct boot_params pvh_bootparams __attribute__((section(".data")));
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struct hvm_start_info pvh_start_info __attribute__((section(".data")));
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unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
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static u64 pvh_get_root_pointer(void)
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{
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return pvh_start_info.rsdp_paddr;
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}
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static void __init init_pvh_bootparams(void)
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{
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struct xen_memory_map memmap;
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int rc;
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memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
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memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table);
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set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table);
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rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
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if (rc) {
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xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
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BUG();
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}
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pvh_bootparams.e820_entries = memmap.nr_entries;
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if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) {
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr =
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ISA_START_ADDRESS;
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size =
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ISA_END_ADDRESS - ISA_START_ADDRESS;
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pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type =
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E820_TYPE_RESERVED;
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pvh_bootparams.e820_entries++;
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} else
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xen_raw_printk("Warning: Can fit ISA range into e820\n");
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pvh_bootparams.hdr.cmd_line_ptr =
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pvh_start_info.cmdline_paddr;
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/* The first module is always ramdisk. */
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if (pvh_start_info.nr_modules) {
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struct hvm_modlist_entry *modaddr =
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__va(pvh_start_info.modlist_paddr);
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pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
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pvh_bootparams.hdr.ramdisk_size = modaddr->size;
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}
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/*
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* See Documentation/x86/boot.txt.
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*
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* Version 2.12 supports Xen entry point but we will use default x86/PC
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* environment (i.e. hardware_subarch 0).
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*/
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pvh_bootparams.hdr.version = 0x212;
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pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
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x86_init.acpi.get_root_pointer = pvh_get_root_pointer;
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}
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/*
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* This routine (and those that it might call) should not use
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* anything that lives in .bss since that segment will be cleared later.
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*/
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void __init xen_prepare_pvh(void)
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{
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u32 msr;
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u64 pfn;
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if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
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xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
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pvh_start_info.magic);
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BUG();
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}
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xen_pvh = 1;
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msr = cpuid_ebx(xen_cpuid_base() + 2);
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pfn = __pa(hypercall_page);
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wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
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init_pvh_bootparams();
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}
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