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Message-Id: <20171215092311.347628971@linuxfoundation.org>
Date: Fri, 15 Dec 2017 10:45:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Ben Hutchings <ben.hutchings@...ethink.co.uk>,
Matt Fleming <matt@...eblueprint.co.uk>,
Borislav Petkov <bp@...e.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...capital.net>,
Andy Lutomirski <luto@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Borislav Petkov <bp@...en8.de>,
Brian Gerst <brgerst@...il.com>,
Dave Jones <davej@...emonkey.org.uk>,
Denys Vlasenko <dvlasenk@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
Stephen Smalley <sds@...ho.nsa.gov>,
Thomas Gleixner <tglx@...utronix.de>,
Toshi Kani <toshi.kani@...com>, linux-efi@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>,
"Ghannam, Yazen" <Yazen.Ghannam@....com>
Subject: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
This reverts commit 87e2bd898d3a79a8c609f183180adac47879a2a4 which is
commit edc3b9129cecd0f0857112136f5b8b1bc1d45918 upstream.
Turns there was too many other issues with this patch to make it viable
for the stable tree.
Reported-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Jones <davej@...emonkey.org.uk>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc: Stephen Smalley <sds@...ho.nsa.gov>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Toshi Kani <toshi.kani@...com>
Cc: linux-efi@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>
Cc: "Ghannam, Yazen" <Yazen.Ghannam@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/mm/pageattr.c | 17 +++++++++++------
arch/x86/platform/efi/efi_64.c | 16 ++++++----------
2 files changed, 17 insertions(+), 16 deletions(-)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -911,10 +911,15 @@ static void populate_pte(struct cpa_data
pte = pte_offset_kernel(pmd, start);
while (num_pages-- && start < end) {
- set_pte(pte, pfn_pte(cpa->pfn, pgprot));
+
+ /* deal with the NX bit */
+ if (!(pgprot_val(pgprot) & _PAGE_NX))
+ cpa->pfn &= ~_PAGE_NX;
+
+ set_pte(pte, pfn_pte(cpa->pfn >> PAGE_SHIFT, pgprot));
start += PAGE_SIZE;
- cpa->pfn++;
+ cpa->pfn += PAGE_SIZE;
pte++;
}
}
@@ -970,11 +975,11 @@ static int populate_pmd(struct cpa_data
pmd = pmd_offset(pud, start);
- set_pmd(pmd, __pmd(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
+ set_pmd(pmd, __pmd(cpa->pfn | _PAGE_PSE |
massage_pgprot(pmd_pgprot)));
start += PMD_SIZE;
- cpa->pfn += PMD_SIZE >> PAGE_SHIFT;
+ cpa->pfn += PMD_SIZE;
cur_pages += PMD_SIZE >> PAGE_SHIFT;
}
@@ -1043,11 +1048,11 @@ static int populate_pud(struct cpa_data
* Map everything starting from the Gb boundary, possibly with 1G pages
*/
while (end - start >= PUD_SIZE) {
- set_pud(pud, __pud(cpa->pfn << PAGE_SHIFT | _PAGE_PSE |
+ set_pud(pud, __pud(cpa->pfn | _PAGE_PSE |
massage_pgprot(pud_pgprot)));
start += PUD_SIZE;
- cpa->pfn += PUD_SIZE >> PAGE_SHIFT;
+ cpa->pfn += PUD_SIZE;
cur_pages += PUD_SIZE >> PAGE_SHIFT;
pud++;
}
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -143,7 +143,7 @@ void efi_sync_low_kernel_mappings(void)
int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
- unsigned long pfn, text;
+ unsigned long text;
struct page *page;
unsigned npages;
pgd_t *pgd;
@@ -160,8 +160,7 @@ int __init efi_setup_page_tables(unsigne
* and ident-map those pages containing the map before calling
* phys_efi_set_virtual_address_map().
*/
- pfn = pa_memmap >> PAGE_SHIFT;
- if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX)) {
+ if (kernel_map_pages_in_pgd(pgd, pa_memmap, pa_memmap, num_pages, _PAGE_NX)) {
pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap);
return 1;
}
@@ -186,9 +185,8 @@ int __init efi_setup_page_tables(unsigne
npages = (_end - _text) >> PAGE_SHIFT;
text = __pa(_text);
- pfn = text >> PAGE_SHIFT;
- if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, 0)) {
+ if (kernel_map_pages_in_pgd(pgd, text >> PAGE_SHIFT, text, npages, 0)) {
pr_err("Failed to map kernel text 1:1\n");
return 1;
}
@@ -206,14 +204,12 @@ void __init efi_cleanup_page_tables(unsi
static void __init __map_region(efi_memory_desc_t *md, u64 va)
{
pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
- unsigned long flags = 0;
- unsigned long pfn;
+ unsigned long pf = 0;
if (!(md->attribute & EFI_MEMORY_WB))
- flags |= _PAGE_PCD;
+ pf |= _PAGE_PCD;
- pfn = md->phys_addr >> PAGE_SHIFT;
- if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags))
+ if (kernel_map_pages_in_pgd(pgd, md->phys_addr, va, md->num_pages, pf))
pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n",
md->phys_addr, va);
}
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