cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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enlighten_pvh.c (1429B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/acpi.h>
      3#include <linux/export.h>
      4
      5#include <xen/hvc-console.h>
      6
      7#include <asm/io_apic.h>
      8#include <asm/hypervisor.h>
      9#include <asm/e820/api.h>
     10
     11#include <xen/xen.h>
     12#include <asm/xen/interface.h>
     13#include <asm/xen/hypercall.h>
     14
     15#include <xen/interface/memory.h>
     16
     17#include "xen-ops.h"
     18
     19/*
     20 * PVH variables.
     21 *
     22 * The variable xen_pvh needs to live in a data segment since it is used
     23 * after startup_{32|64} is invoked, which will clear the .bss segment.
     24 */
     25bool __ro_after_init xen_pvh;
     26EXPORT_SYMBOL_GPL(xen_pvh);
     27
     28void __init xen_pvh_init(struct boot_params *boot_params)
     29{
     30	u32 msr;
     31	u64 pfn;
     32
     33	xen_pvh = 1;
     34	xen_domain_type = XEN_HVM_DOMAIN;
     35	xen_start_flags = pvh_start_info.flags;
     36
     37	msr = cpuid_ebx(xen_cpuid_base() + 2);
     38	pfn = __pa(hypercall_page);
     39	wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
     40
     41	if (xen_initial_domain())
     42		x86_init.oem.arch_setup = xen_add_preferred_consoles;
     43	x86_init.oem.banner = xen_banner;
     44
     45	xen_efi_init(boot_params);
     46}
     47
     48void __init mem_map_via_hcall(struct boot_params *boot_params_p)
     49{
     50	struct xen_memory_map memmap;
     51	int rc;
     52
     53	memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
     54	set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
     55	rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
     56	if (rc) {
     57		xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
     58		BUG();
     59	}
     60	boot_params_p->e820_entries = memmap.nr_entries;
     61}