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418492ba40
In case we are booted via the default boot entry by a generic loader like grub or OVMF it is necessary to distinguish between a HVM guest with a device model supporting legacy devices and a PVH guest without device model. PVH guests will always have x86_platform.legacy.no_vga set and x86_platform.legacy.rtc cleared, while both won't be true for HVM guests. Test for both conditions in the guest_late_init hook and set xen_pvh to true if they are met. Move some of the early PVH initializations to the new hook in order to avoid duplicated code. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: boris.ostrovsky@oracle.com Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20171109132739.23465-6-jgross@suse.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
98 lines
2.6 KiB
C
98 lines
2.6 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/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 and pvh_bootparams need to live in data segment since they
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* 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;
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unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
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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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}
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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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