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Message-ID: <bbd67c4e-6adf-dc1f-7104-427e3e598d9a@soleen.com>
Date: Thu, 21 Apr 2022 14:40:33 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Tong Tiangen <tongtiangen@...wei.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
LKML <linux-kernel@...r.kernel.org>,
Anshuman Khandual <anshuman.khandual@....com>,
linux-mm <linux-mm@...ck.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Will Deacon <will@...nel.org>,
Albert Ou <aou@...s.berkeley.edu>,
Palmer Dabbelt <palmer@...belt.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
linux-riscv@...ts.infradead.org, Guohanjun <guohanjun@...wei.com>
Subject: Re: [PATCH -next v5 1/5] mm: page_table_check: using PxD_SIZE instead
of PxD_PAGE_SIZE
On 4/21/22 11:28, Pasha Tatashin wrote:
> On Thu, Apr 21, 2022 at 4:02 AM Tong Tiangen <tongtiangen@...wei.com> wrote:
>>
>> Macro PUD_SIZE/PMD_SIZE is more general in various architectures. Using
>> PUD_SIZE/PMD_SIZE instead of PUD_PAGE_SIZE/PMD_PAGE_SIZE can better
>> support page table check in architectures other than x86 and it is no
>> functional impact on x86.
>>
>> Suggested-by: Anshuman Khandual <anshuman.khandual@....com>
>> Signed-off-by: Tong Tiangen <tongtiangen@...wei.com>
>
> Acked-by: Pasha Tatashin <pasha.tatashin@...een.com>
To avoid similar problems in the future, please also include the following patch after the current series:
----------------8<-------------[ cut here ]------------------
>From cccef7ba2433f8e97d1948f85e3bfb2ef5d32a0a Mon Sep 17 00:00:00 2001
From: Pasha Tatashin <pasha.tatashin@...een.com>
Date: Thu, 21 Apr 2022 18:04:43 +0000
Subject: [PATCH] x86: removed P*D_PAGE_MASK and P*D_PAGE_SIZE
Other architectures and the common mm/ use P*D_MASK, and P*D_SIZE.
Remove the duplicated P*D_PAGE_MASK and P*D_PAGE_SIZE which are only
used in x86/*.
Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
arch/x86/include/asm/page_types.h | 12 +++---------
arch/x86/kernel/amd_gart_64.c | 2 +-
arch/x86/kernel/head64.c | 2 +-
arch/x86/mm/mem_encrypt_boot.S | 4 ++--
arch/x86/mm/mem_encrypt_identity.c | 18 +++++++++---------
arch/x86/mm/pat/set_memory.c | 6 +++---
arch/x86/mm/pti.c | 2 +-
7 files changed, 20 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h
index a506a411474d..86bd4311daf8 100644
--- a/arch/x86/include/asm/page_types.h
+++ b/arch/x86/include/asm/page_types.h
@@ -11,20 +11,14 @@
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
-#define PMD_PAGE_SIZE (_AC(1, UL) << PMD_SHIFT)
-#define PMD_PAGE_MASK (~(PMD_PAGE_SIZE-1))
-
-#define PUD_PAGE_SIZE (_AC(1, UL) << PUD_SHIFT)
-#define PUD_PAGE_MASK (~(PUD_PAGE_SIZE-1))
-
#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
-/* Cast *PAGE_MASK to a signed type so that it is sign-extended if
+/* Cast P*D_MASK to a signed type so that it is sign-extended if
virtual addresses are 32-bits but physical addresses are larger
(ie, 32-bit PAE). */
#define PHYSICAL_PAGE_MASK (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
-#define PHYSICAL_PMD_PAGE_MASK (((signed long)PMD_PAGE_MASK) & __PHYSICAL_MASK)
-#define PHYSICAL_PUD_PAGE_MASK (((signed long)PUD_PAGE_MASK) & __PHYSICAL_MASK)
+#define PHYSICAL_PMD_PAGE_MASK (((signed long)PMD_MASK) & __PHYSICAL_MASK)
+#define PHYSICAL_PUD_PAGE_MASK (((signed long)PUD_MASK) & __PHYSICAL_MASK)
#define HPAGE_SHIFT PMD_SHIFT
#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index ed837383de5c..02579ea02351 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -506,7 +506,7 @@ static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)
}
a = aper + iommu_size;
- iommu_size -= round_up(a, PMD_PAGE_SIZE) - a;
+ iommu_size -= round_up(a, PMD_SIZE) - a;
if (iommu_size < 64*1024*1024) {
pr_warn("PCI-DMA: Warning: Small IOMMU %luMB."
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 4f5ecbbaae77..f11ca415e97c 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -189,7 +189,7 @@ unsigned long __head __startup_64(unsigned long physaddr,
load_delta = physaddr - (unsigned long)(_text - __START_KERNEL_map);
/* Is the address not 2M aligned? */
- if (load_delta & ~PMD_PAGE_MASK)
+ if (load_delta & ~PMD_MASK)
for (;;);
/* Activate Secure Memory Encryption (SME) if supported and enabled */
diff --git a/arch/x86/mm/mem_encrypt_boot.S b/arch/x86/mm/mem_encrypt_boot.S
index 3d1dba05fce4..640131736a19 100644
--- a/arch/x86/mm/mem_encrypt_boot.S
+++ b/arch/x86/mm/mem_encrypt_boot.S
@@ -26,7 +26,7 @@ SYM_FUNC_START(sme_encrypt_execute)
* RCX - virtual address of the encryption workarea, including:
* - stack page (PAGE_SIZE)
* - encryption routine page (PAGE_SIZE)
- * - intermediate copy buffer (PMD_PAGE_SIZE)
+ * - intermediate copy buffer (PMD_SIZE)
* R8 - physical address of the pagetables to use for encryption
*/
@@ -120,7 +120,7 @@ SYM_FUNC_START(__enc_copy)
wbinvd /* Invalidate any cache entries */
/* Copy/encrypt up to 2MB at a time */
- movq $PMD_PAGE_SIZE, %r12
+ movq $PMD_SIZE, %r12
1:
cmpq %r12, %r9
jnb 2f
diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c
index b43bc24d2bb6..357039a38547 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/mm/mem_encrypt_identity.c
@@ -92,7 +92,7 @@ struct sme_populate_pgd_data {
* section is 2MB aligned to allow for simple pagetable setup using only
* PMD entries (see vmlinux.lds.S).
*/
-static char sme_workarea[2 * PMD_PAGE_SIZE] __section(".init.scratch");
+static char sme_workarea[2 * PMD_SIZE] __section(".init.scratch");
static char sme_cmdline_arg[] __initdata = "mem_encrypt";
static char sme_cmdline_on[] __initdata = "on";
@@ -197,8 +197,8 @@ static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd)
while (ppd->vaddr < ppd->vaddr_end) {
sme_populate_pgd_large(ppd);
- ppd->vaddr += PMD_PAGE_SIZE;
- ppd->paddr += PMD_PAGE_SIZE;
+ ppd->vaddr += PMD_SIZE;
+ ppd->paddr += PMD_SIZE;
}
}
@@ -224,11 +224,11 @@ static void __init __sme_map_range(struct sme_populate_pgd_data *ppd,
vaddr_end = ppd->vaddr_end;
/* If start is not 2MB aligned, create PTE entries */
- ppd->vaddr_end = ALIGN(ppd->vaddr, PMD_PAGE_SIZE);
+ ppd->vaddr_end = ALIGN(ppd->vaddr, PMD_SIZE);
__sme_map_range_pte(ppd);
/* Create PMD entries */
- ppd->vaddr_end = vaddr_end & PMD_PAGE_MASK;
+ ppd->vaddr_end = vaddr_end & PMD_MASK;
__sme_map_range_pmd(ppd);
/* If end is not 2MB aligned, create PTE entries */
@@ -324,7 +324,7 @@ void __init sme_encrypt_kernel(struct boot_params *bp)
/* Physical addresses gives us the identity mapped virtual addresses */
kernel_start = __pa_symbol(_text);
- kernel_end = ALIGN(__pa_symbol(_end), PMD_PAGE_SIZE);
+ kernel_end = ALIGN(__pa_symbol(_end), PMD_SIZE);
kernel_len = kernel_end - kernel_start;
initrd_start = 0;
@@ -354,12 +354,12 @@ void __init sme_encrypt_kernel(struct boot_params *bp)
* executable encryption area size:
* stack page (PAGE_SIZE)
* encryption routine page (PAGE_SIZE)
- * intermediate copy buffer (PMD_PAGE_SIZE)
+ * intermediate copy buffer (PMD_SIZE)
* pagetable structures for the encryption of the kernel
* pagetable structures for workarea (in case not currently mapped)
*/
execute_start = workarea_start;
- execute_end = execute_start + (PAGE_SIZE * 2) + PMD_PAGE_SIZE;
+ execute_end = execute_start + (PAGE_SIZE * 2) + PMD_SIZE;
execute_len = execute_end - execute_start;
/*
@@ -382,7 +382,7 @@ void __init sme_encrypt_kernel(struct boot_params *bp)
* before it is mapped.
*/
workarea_len = execute_len + pgtable_area_len;
- workarea_end = ALIGN(workarea_start + workarea_len, PMD_PAGE_SIZE);
+ workarea_end = ALIGN(workarea_start + workarea_len, PMD_SIZE);
/*
* Set the address to the start of where newly created pagetable
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index abf5ed76e4b7..8016d93c1288 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -714,11 +714,11 @@ phys_addr_t slow_virt_to_phys(void *__virt_addr)
switch (level) {
case PG_LEVEL_1G:
phys_addr = (phys_addr_t)pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
- offset = virt_addr & ~PUD_PAGE_MASK;
+ offset = virt_addr & ~PUD_MASK;
break;
case PG_LEVEL_2M:
phys_addr = (phys_addr_t)pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
- offset = virt_addr & ~PMD_PAGE_MASK;
+ offset = virt_addr & ~PMD_MASK;
break;
default:
phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
@@ -1006,7 +1006,7 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
case PG_LEVEL_1G:
ref_prot = pud_pgprot(*(pud_t *)kpte);
ref_pfn = pud_pfn(*(pud_t *)kpte);
- pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;
+ pfninc = PMD_SIZE >> PAGE_SHIFT;
lpaddr = address & PUD_MASK;
lpinc = PMD_SIZE;
/*
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 5d5c7bb50ce9..a28c8d57273a 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -592,7 +592,7 @@ static void pti_set_kernel_image_nonglobal(void)
* of the image.
*/
unsigned long start = PFN_ALIGN(_text);
- unsigned long end = ALIGN((unsigned long)_end, PMD_PAGE_SIZE);
+ unsigned long end = ALIGN((unsigned long)_end, PMD_SIZE);
/*
* This clears _PAGE_GLOBAL from the entire kernel image.
--
2.36.0.rc2.479.g8af0fa9b8e-goog
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