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Message-ID: <YopmHXcHw/STtSY0@linux.ibm.com>
Date: Sun, 22 May 2022 19:34:37 +0300
From: Mike Rapoport <rppt@...ux.ibm.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
luto@...nel.org, peterz@...radead.org, logang@...tatee.com
Subject: Re: [PATCH] x86: removed P*D_PAGE_MASK and P*D_PAGE_SIZE
On Mon, May 16, 2022 at 06:52:02PM +0000, Pasha Tatashin wrote:
> From: Pasha Tatashin <pasha.tatashin@...een.com>
>
> 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>
Acked-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>
> Applies against next-20220516 that contains:
> mm: page_table_check: using PxD_SIZE instead of PxD_PAGE_SIZ
>
> 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 194d54eed537..78f5f89d8401 100644
> --- a/arch/x86/kernel/amd_gart_64.c
> +++ b/arch/x86/kernel/amd_gart_64.c
> @@ -504,7 +504,7 @@ 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 bd4a34100ed0..fb2df18cc994 100644
> --- a/arch/x86/kernel/head64.c
> +++ b/arch/x86/kernel/head64.c
> @@ -203,7 +203,7 @@ 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 (;;);
>
> /* Include the SME encryption mask in the fixup value */
> 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 f415498d3175..88cccd65029d 100644
> --- a/arch/x86/mm/mem_encrypt_identity.c
> +++ b/arch/x86/mm/mem_encrypt_identity.c
> @@ -93,7 +93,7 @@ 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";
> @@ -198,8 +198,8 @@ 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;
> }
> }
>
> @@ -225,11 +225,11 @@ 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 */
> @@ -325,7 +325,7 @@ 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;
> @@ -355,12 +355,12 @@ 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;
>
> /*
> @@ -383,7 +383,7 @@ 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 9200e619d8b7..011e1fcd03bc 100644
> --- a/arch/x86/mm/pat/set_memory.c
> +++ b/arch/x86/mm/pat/set_memory.c
> @@ -703,11 +703,11 @@ 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;
> @@ -995,7 +995,7 @@ __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 ffe3b3a087fe..78414c6d1b5e 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.
> --
> 2.36.0.550.gb090851708-goog
>
>
--
Sincerely yours,
Mike.
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