mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 20:47:12 +07:00
4febfb8dd0
Replace all GPL license blurbs with an equivalent SPDX header (most files are GPLv2, some are GPLv2+). While at it, drop some outdated header changelogs as well. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Alexander Graf <agraf@suse.de> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: Jeffrey Hugo <jhugo@codeaurora.org> Cc: Lee Jones <lee.jones@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20190202094119.13230-7-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
184 lines
4.8 KiB
C
184 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "efi: memattr: " fmt
|
|
|
|
#include <linux/efi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/early_ioremap.h>
|
|
|
|
static int __initdata tbl_size;
|
|
|
|
/*
|
|
* Reserve the memory associated with the Memory Attributes configuration
|
|
* table, if it exists.
|
|
*/
|
|
int __init efi_memattr_init(void)
|
|
{
|
|
efi_memory_attributes_table_t *tbl;
|
|
|
|
if (efi.mem_attr_table == EFI_INVALID_TABLE_ADDR)
|
|
return 0;
|
|
|
|
tbl = early_memremap(efi.mem_attr_table, sizeof(*tbl));
|
|
if (!tbl) {
|
|
pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",
|
|
efi.mem_attr_table);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (tbl->version > 1) {
|
|
pr_warn("Unexpected EFI Memory Attributes table version %d\n",
|
|
tbl->version);
|
|
goto unmap;
|
|
}
|
|
|
|
tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;
|
|
memblock_reserve(efi.mem_attr_table, tbl_size);
|
|
set_bit(EFI_MEM_ATTR, &efi.flags);
|
|
|
|
unmap:
|
|
early_memunmap(tbl, sizeof(*tbl));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns a copy @out of the UEFI memory descriptor @in if it is covered
|
|
* entirely by a UEFI memory map entry with matching attributes. The virtual
|
|
* address of @out is set according to the matching entry that was found.
|
|
*/
|
|
static bool entry_is_valid(const efi_memory_desc_t *in, efi_memory_desc_t *out)
|
|
{
|
|
u64 in_paddr = in->phys_addr;
|
|
u64 in_size = in->num_pages << EFI_PAGE_SHIFT;
|
|
efi_memory_desc_t *md;
|
|
|
|
*out = *in;
|
|
|
|
if (in->type != EFI_RUNTIME_SERVICES_CODE &&
|
|
in->type != EFI_RUNTIME_SERVICES_DATA) {
|
|
pr_warn("Entry type should be RuntimeServiceCode/Data\n");
|
|
return false;
|
|
}
|
|
|
|
if (!(in->attribute & (EFI_MEMORY_RO | EFI_MEMORY_XP))) {
|
|
pr_warn("Entry attributes invalid: RO and XP bits both cleared\n");
|
|
return false;
|
|
}
|
|
|
|
if (PAGE_SIZE > EFI_PAGE_SIZE &&
|
|
(!PAGE_ALIGNED(in->phys_addr) ||
|
|
!PAGE_ALIGNED(in->num_pages << EFI_PAGE_SHIFT))) {
|
|
/*
|
|
* Since arm64 may execute with page sizes of up to 64 KB, the
|
|
* UEFI spec mandates that RuntimeServices memory regions must
|
|
* be 64 KB aligned. We need to validate this here since we will
|
|
* not be able to tighten permissions on such regions without
|
|
* affecting adjacent regions.
|
|
*/
|
|
pr_warn("Entry address region misaligned\n");
|
|
return false;
|
|
}
|
|
|
|
for_each_efi_memory_desc(md) {
|
|
u64 md_paddr = md->phys_addr;
|
|
u64 md_size = md->num_pages << EFI_PAGE_SHIFT;
|
|
|
|
if (!(md->attribute & EFI_MEMORY_RUNTIME))
|
|
continue;
|
|
if (md->virt_addr == 0 && md->phys_addr != 0) {
|
|
/* no virtual mapping has been installed by the stub */
|
|
break;
|
|
}
|
|
|
|
if (md_paddr > in_paddr || (in_paddr - md_paddr) >= md_size)
|
|
continue;
|
|
|
|
/*
|
|
* This entry covers the start of @in, check whether
|
|
* it covers the end as well.
|
|
*/
|
|
if (md_paddr + md_size < in_paddr + in_size) {
|
|
pr_warn("Entry covers multiple EFI memory map regions\n");
|
|
return false;
|
|
}
|
|
|
|
if (md->type != in->type) {
|
|
pr_warn("Entry type deviates from EFI memory map region type\n");
|
|
return false;
|
|
}
|
|
|
|
out->virt_addr = in_paddr + (md->virt_addr - md_paddr);
|
|
|
|
return true;
|
|
}
|
|
|
|
pr_warn("No matching entry found in the EFI memory map\n");
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* To be called after the EFI page tables have been populated. If a memory
|
|
* attributes table is available, its contents will be used to update the
|
|
* mappings with tightened permissions as described by the table.
|
|
* This requires the UEFI memory map to have already been populated with
|
|
* virtual addresses.
|
|
*/
|
|
int __init efi_memattr_apply_permissions(struct mm_struct *mm,
|
|
efi_memattr_perm_setter fn)
|
|
{
|
|
efi_memory_attributes_table_t *tbl;
|
|
int i, ret;
|
|
|
|
if (tbl_size <= sizeof(*tbl))
|
|
return 0;
|
|
|
|
/*
|
|
* We need the EFI memory map to be setup so we can use it to
|
|
* lookup the virtual addresses of all entries in the of EFI
|
|
* Memory Attributes table. If it isn't available, this
|
|
* function should not be called.
|
|
*/
|
|
if (WARN_ON(!efi_enabled(EFI_MEMMAP)))
|
|
return 0;
|
|
|
|
tbl = memremap(efi.mem_attr_table, tbl_size, MEMREMAP_WB);
|
|
if (!tbl) {
|
|
pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",
|
|
efi.mem_attr_table);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (efi_enabled(EFI_DBG))
|
|
pr_info("Processing EFI Memory Attributes table:\n");
|
|
|
|
for (i = ret = 0; ret == 0 && i < tbl->num_entries; i++) {
|
|
efi_memory_desc_t md;
|
|
unsigned long size;
|
|
bool valid;
|
|
char buf[64];
|
|
|
|
valid = entry_is_valid((void *)tbl->entry + i * tbl->desc_size,
|
|
&md);
|
|
size = md.num_pages << EFI_PAGE_SHIFT;
|
|
if (efi_enabled(EFI_DBG) || !valid)
|
|
pr_info("%s 0x%012llx-0x%012llx %s\n",
|
|
valid ? "" : "!", md.phys_addr,
|
|
md.phys_addr + size - 1,
|
|
efi_md_typeattr_format(buf, sizeof(buf), &md));
|
|
|
|
if (valid) {
|
|
ret = fn(mm, &md);
|
|
if (ret)
|
|
pr_err("Error updating mappings, skipping subsequent md's\n");
|
|
}
|
|
}
|
|
memunmap(tbl);
|
|
return ret;
|
|
}
|