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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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72813bfbf0
This involves initializing the boot params EFI related fields and the efi global variable. Without this fix a PVH dom0 doesn't detect when booted from EFI, and thus doesn't support accessing any of the EFI related data. Reported-by: PGNet Dev <pgnet.dev@gmail.com> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: stable@vger.kernel.org # 4.19+
56 lines
1.3 KiB
C
56 lines
1.3 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 <xen/xen.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-ops.h"
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/*
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* PVH variables.
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*
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* The variable xen_pvh needs to live in the data segment since it is used
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* after startup_{32|64} is invoked, which will clear the .bss segment.
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*/
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bool xen_pvh __attribute__((section(".data"))) = 0;
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void __init xen_pvh_init(struct boot_params *boot_params)
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{
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u32 msr;
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u64 pfn;
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xen_pvh = 1;
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xen_domain_type = XEN_HVM_DOMAIN;
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xen_start_flags = pvh_start_info.flags;
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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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xen_efi_init(boot_params);
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}
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void __init mem_map_via_hcall(struct boot_params *boot_params_p)
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{
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struct xen_memory_map memmap;
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int rc;
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memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
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set_xen_guest_handle(memmap.buffer, boot_params_p->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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boot_params_p->e820_entries = memmap.nr_entries;
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}
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