linux-stable/arch/x86/xen/enlighten_pvh.c
Roger Pau Monne 72813bfbf0 xen/pvh: correctly setup the PV EFI interface for dom0
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+
2019-04-25 10:36:25 -04:00

55 lines
1.3 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/acpi.h>
#include <xen/hvc-console.h>
#include <asm/io_apic.h>
#include <asm/hypervisor.h>
#include <asm/e820/api.h>
#include <xen/xen.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
#include <xen/interface/memory.h>
#include "xen-ops.h"
/*
* PVH variables.
*
* The variable xen_pvh needs to live in the data segment since it is used
* after startup_{32|64} is invoked, which will clear the .bss segment.
*/
bool xen_pvh __attribute__((section(".data"))) = 0;
void __init xen_pvh_init(struct boot_params *boot_params)
{
u32 msr;
u64 pfn;
xen_pvh = 1;
xen_domain_type = XEN_HVM_DOMAIN;
xen_start_flags = pvh_start_info.flags;
msr = cpuid_ebx(xen_cpuid_base() + 2);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
xen_efi_init(boot_params);
}
void __init mem_map_via_hcall(struct boot_params *boot_params_p)
{
struct xen_memory_map memmap;
int rc;
memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc) {
xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
BUG();
}
boot_params_p->e820_entries = memmap.nr_entries;
}