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Message-ID: <20200701141732.957084206@hpe.com>
Date: Wed, 01 Jul 2020 09:17:43 -0500
From: steve.wahl@....com
To: Jonathan Corbet <corbet@....net>, Ard Biesheuvel <ardb@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Paul E. McKenney" <paulmck@...nel.org>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
Juergen Gross <jgross@...e.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Oliver Neukum <oneukum@...e.com>,
Mike Travis <mike.travis@....com>,
Steve Wahl <steve.wahl@....com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Benjamin Thiel <b.thiel@...teo.de>,
Andy Lutomirski <luto@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
James Morris <jmorris@...ei.org>,
David Howells <dhowells@...hat.com>,
Kees Cook <keescook@...omium.org>,
Dave Young <dyoung@...hat.com>,
Dan Williams <dan.j.williams@...el.com>,
Logan Gunthorpe <logang@...tatee.com>,
Alexandre Chartre <alexandre.chartre@...cle.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Austin Kim <austindh.kim@...il.com>,
Alexey Dobriyan <adobriyan@...il.com>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-efi@...r.kernel.org
Cc: Russ Anderson <rja@....com>
Subject: [patch 12/13] Remove uv bios and efi code related to (now unused) EFI_UV1_MEMMAP
With UV1 removed, EFI_UV1_MEMMAP is not used. Remove code used by it
in arch/x86/platform/uv/bios_uv.c and turn off code in
arch/x86/platform/efi/efi.c that referenced this code.
Signed-off-by: Steve Wahl <steve.wahl@....com>
---
arch/x86/platform/efi/efi.c | 2
arch/x86/platform/uv/bios_uv.c | 159 -----------------------------------------
2 files changed, 2 insertions(+), 159 deletions(-)
--- linux.orig/arch/x86/platform/uv/bios_uv.c 2020-06-25 16:13:51.765087047 -0500
+++ linux/arch/x86/platform/uv/bios_uv.c 2020-06-25 16:14:29.821045358 -0500
@@ -30,17 +30,7 @@ static s64 __uv_bios_call(enum uv_bios_c
*/
return BIOS_STATUS_UNIMPLEMENTED;
- /*
- * If EFI_UV1_MEMMAP is set, we need to fall back to using our old EFI
- * callback method, which uses efi_call() directly, with the kernel page tables:
- */
- if (unlikely(efi_enabled(EFI_UV1_MEMMAP))) {
- kernel_fpu_begin();
- ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
- kernel_fpu_end();
- } else {
- ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
- }
+ ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
return ret;
}
@@ -209,150 +199,3 @@ int uv_bios_init(void)
pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
return 0;
}
-
-static void __init early_code_mapping_set_exec(int executable)
-{
- efi_memory_desc_t *md;
-
- if (!(__supported_pte_mask & _PAGE_NX))
- return;
-
- /* Make EFI service code area executable */
- for_each_efi_memory_desc(md) {
- if (md->type == EFI_RUNTIME_SERVICES_CODE ||
- md->type == EFI_BOOT_SERVICES_CODE)
- efi_set_executable(md, executable);
- }
-}
-
-void __init efi_uv1_memmap_phys_epilog(pgd_t *save_pgd)
-{
- /*
- * After the lock is released, the original page table is restored.
- */
- int pgd_idx, i;
- int nr_pgds;
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
-
- nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
-
- for (pgd_idx = 0; pgd_idx < nr_pgds; pgd_idx++) {
- pgd = pgd_offset_k(pgd_idx * PGDIR_SIZE);
- set_pgd(pgd_offset_k(pgd_idx * PGDIR_SIZE), save_pgd[pgd_idx]);
-
- if (!pgd_present(*pgd))
- continue;
-
- for (i = 0; i < PTRS_PER_P4D; i++) {
- p4d = p4d_offset(pgd,
- pgd_idx * PGDIR_SIZE + i * P4D_SIZE);
-
- if (!p4d_present(*p4d))
- continue;
-
- pud = (pud_t *)p4d_page_vaddr(*p4d);
- pud_free(&init_mm, pud);
- }
-
- p4d = (p4d_t *)pgd_page_vaddr(*pgd);
- p4d_free(&init_mm, p4d);
- }
-
- kfree(save_pgd);
-
- __flush_tlb_all();
- early_code_mapping_set_exec(0);
-}
-
-pgd_t * __init efi_uv1_memmap_phys_prolog(void)
-{
- unsigned long vaddr, addr_pgd, addr_p4d, addr_pud;
- pgd_t *save_pgd, *pgd_k, *pgd_efi;
- p4d_t *p4d, *p4d_k, *p4d_efi;
- pud_t *pud;
-
- int pgd;
- int n_pgds, i, j;
-
- early_code_mapping_set_exec(1);
-
- n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE);
- save_pgd = kmalloc_array(n_pgds, sizeof(*save_pgd), GFP_KERNEL);
- if (!save_pgd)
- return NULL;
-
- /*
- * Build 1:1 identity mapping for UV1 memmap usage. Note that
- * PAGE_OFFSET is PGDIR_SIZE aligned when KASLR is disabled, while
- * it is PUD_SIZE ALIGNED with KASLR enabled. So for a given physical
- * address X, the pud_index(X) != pud_index(__va(X)), we can only copy
- * PUD entry of __va(X) to fill in pud entry of X to build 1:1 mapping.
- * This means here we can only reuse the PMD tables of the direct mapping.
- */
- for (pgd = 0; pgd < n_pgds; pgd++) {
- addr_pgd = (unsigned long)(pgd * PGDIR_SIZE);
- vaddr = (unsigned long)__va(pgd * PGDIR_SIZE);
- pgd_efi = pgd_offset_k(addr_pgd);
- save_pgd[pgd] = *pgd_efi;
-
- p4d = p4d_alloc(&init_mm, pgd_efi, addr_pgd);
- if (!p4d) {
- pr_err("Failed to allocate p4d table!\n");
- goto out;
- }
-
- for (i = 0; i < PTRS_PER_P4D; i++) {
- addr_p4d = addr_pgd + i * P4D_SIZE;
- p4d_efi = p4d + p4d_index(addr_p4d);
-
- pud = pud_alloc(&init_mm, p4d_efi, addr_p4d);
- if (!pud) {
- pr_err("Failed to allocate pud table!\n");
- goto out;
- }
-
- for (j = 0; j < PTRS_PER_PUD; j++) {
- addr_pud = addr_p4d + j * PUD_SIZE;
-
- if (addr_pud > (max_pfn << PAGE_SHIFT))
- break;
-
- vaddr = (unsigned long)__va(addr_pud);
-
- pgd_k = pgd_offset_k(vaddr);
- p4d_k = p4d_offset(pgd_k, vaddr);
- pud[j] = *pud_offset(p4d_k, vaddr);
- }
- }
- pgd_offset_k(pgd * PGDIR_SIZE)->pgd &= ~_PAGE_NX;
- }
-
- __flush_tlb_all();
- return save_pgd;
-out:
- efi_uv1_memmap_phys_epilog(save_pgd);
- return NULL;
-}
-
-void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
- u32 type, u64 attribute)
-{
- unsigned long last_map_pfn;
-
- if (type == EFI_MEMORY_MAPPED_IO)
- return ioremap(phys_addr, size);
-
- last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size,
- PAGE_KERNEL);
- if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
- unsigned long top = last_map_pfn << PAGE_SHIFT;
- efi_ioremap(top, size - (top - phys_addr), type, attribute);
- }
-
- if (!(attribute & EFI_MEMORY_WB))
- efi_memory_uc((u64)(unsigned long)__va(phys_addr), size);
-
- return (void __iomem *)__va(phys_addr);
-}
--- linux.orig/arch/x86/platform/efi/efi.c 2020-06-25 16:13:54.637083901 -0500
+++ linux/arch/x86/platform/efi/efi.c 2020-06-25 16:15:14.532996386 -0500
@@ -496,7 +496,7 @@ void __init efi_init(void)
efi_print_memmap();
}
-#if defined(CONFIG_X86_32) || defined(CONFIG_X86_UV)
+#if defined(CONFIG_X86_32)
void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
{
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