x86/efi: Runtime services virtual mapping
We map the EFI regions needed for runtime services non-contiguously, with preserved alignment on virtual addresses starting from -4G down for a total max space of 64G. This way, we provide for stable runtime services addresses across kernels so that a kexec'd kernel can still use them. Thus, they're mapped in a separate pagetable so that we don't pollute the kernel namespace. Add an efi= kernel command line parameter for passing miscellaneous options and chicken bits from the command line. While at it, add a chicken bit called "efi=old_map" which can be used as a fallback to the old runtime services mapping method in case there's some b0rkage with a particular EFI implementation (haha, it is hard to hold up the sarcasm here...). Also, add the UEFI RT VA space to Documentation/x86/x86_64/mm.txt. Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov
Matt Fleming
Родитель
82f0712ca0
Коммит
d2f7cbe7b2
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@ -835,6 +835,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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edd= [EDD]
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Format: {"off" | "on" | "skip[mbr]"}
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efi= [EFI]
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Format: { "old_map" }
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old_map [X86-64]: switch to the old ioremap-based EFI
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runtime services mapping. 32-bit still uses this one by
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default.
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efi_no_storage_paranoia [EFI; X86]
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Using this parameter you can use more than 50% of
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your efi variable storage. Use this parameter only if
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@ -28,4 +28,11 @@ reference.
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Current X86-64 implementations only support 40 bits of address space,
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but we support up to 46 bits. This expands into MBZ space in the page tables.
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->trampoline_pgd:
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We map EFI runtime services in the aforementioned PGD in the virtual
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range of 64Gb (arbitrarily set, can be raised if needed)
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0xffffffef00000000 - 0xffffffff00000000
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-Andi Kleen, Jul 2004
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@ -1,6 +1,24 @@
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#ifndef _ASM_X86_EFI_H
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#define _ASM_X86_EFI_H
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/*
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* We map the EFI regions needed for runtime services non-contiguously,
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* with preserved alignment on virtual addresses starting from -4G down
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* for a total max space of 64G. This way, we provide for stable runtime
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* services addresses across kernels so that a kexec'd kernel can still
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* use them.
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*
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* This is the main reason why we're doing stable VA mappings for RT
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* services.
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*
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* This flag is used in conjuction with a chicken bit called
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* "efi=old_map" which can be used as a fallback to the old runtime
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* services mapping method in case there's some b0rkage with a
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* particular EFI implementation (haha, it is hard to hold up the
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* sarcasm here...).
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*/
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#define EFI_OLD_MEMMAP EFI_ARCH_1
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#ifdef CONFIG_X86_32
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#define EFI_LOADER_SIGNATURE "EL32"
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@ -69,24 +87,31 @@ extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
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efi_call6((f), (u64)(a1), (u64)(a2), (u64)(a3), \
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(u64)(a4), (u64)(a5), (u64)(a6))
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#define _efi_call_virtX(x, f, ...) \
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({ \
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efi_status_t __s; \
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\
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efi_sync_low_kernel_mappings(); \
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preempt_disable(); \
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__s = efi_call##x((void *)efi.systab->runtime->f, __VA_ARGS__); \
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preempt_enable(); \
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__s; \
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})
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#define efi_call_virt0(f) \
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efi_call0((efi.systab->runtime->f))
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_efi_call_virtX(0, f)
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#define efi_call_virt1(f, a1) \
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efi_call1((efi.systab->runtime->f), (u64)(a1))
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_efi_call_virtX(1, f, (u64)(a1))
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#define efi_call_virt2(f, a1, a2) \
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efi_call2((efi.systab->runtime->f), (u64)(a1), (u64)(a2))
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_efi_call_virtX(2, f, (u64)(a1), (u64)(a2))
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#define efi_call_virt3(f, a1, a2, a3) \
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efi_call3((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3))
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_efi_call_virtX(3, f, (u64)(a1), (u64)(a2), (u64)(a3))
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#define efi_call_virt4(f, a1, a2, a3, a4) \
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efi_call4((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4))
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_efi_call_virtX(4, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4))
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#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
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efi_call5((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4), (u64)(a5))
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_efi_call_virtX(5, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5))
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#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
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efi_call6((efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
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(u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
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_efi_call_virtX(6, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
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extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
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u32 type, u64 attribute);
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@ -95,12 +120,17 @@ extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
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extern int add_efi_memmap;
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extern unsigned long x86_efi_facility;
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extern struct efi_scratch efi_scratch;
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extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
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extern int efi_memblock_x86_reserve_range(void);
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extern void efi_call_phys_prelog(void);
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extern void efi_call_phys_epilog(void);
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extern void efi_unmap_memmap(void);
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extern void efi_memory_uc(u64 addr, unsigned long size);
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extern void __init efi_map_region(efi_memory_desc_t *md);
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extern void efi_sync_low_kernel_mappings(void);
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extern void efi_setup_page_tables(void);
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extern void __init old_map_region(efi_memory_desc_t *md);
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#ifdef CONFIG_EFI
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@ -379,7 +379,8 @@ static inline void update_page_count(int level, unsigned long pages) { }
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*/
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extern pte_t *lookup_address(unsigned long address, unsigned int *level);
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extern phys_addr_t slow_virt_to_phys(void *__address);
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extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
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unsigned numpages, unsigned long page_flags);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_PGTABLE_DEFS_H */
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@ -12,6 +12,8 @@
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* Bibo Mao <bibo.mao@intel.com>
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* Chandramouli Narayanan <mouli@linux.intel.com>
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* Huang Ying <ying.huang@intel.com>
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* Copyright (C) 2013 SuSE Labs
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* Borislav Petkov <bp@suse.de> - runtime services VA mapping
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*
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* Copied from efi_32.c to eliminate the duplicated code between EFI
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* 32/64 support code. --ying 2007-10-26
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@ -745,21 +747,56 @@ void efi_memory_uc(u64 addr, unsigned long size)
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set_memory_uc(addr, npages);
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}
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void __init old_map_region(efi_memory_desc_t *md)
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{
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u64 start_pfn, end_pfn, end;
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unsigned long size;
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void *va;
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start_pfn = PFN_DOWN(md->phys_addr);
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size = md->num_pages << PAGE_SHIFT;
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end = md->phys_addr + size;
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end_pfn = PFN_UP(end);
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if (pfn_range_is_mapped(start_pfn, end_pfn)) {
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va = __va(md->phys_addr);
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if (!(md->attribute & EFI_MEMORY_WB))
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efi_memory_uc((u64)(unsigned long)va, size);
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} else
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va = efi_ioremap(md->phys_addr, size,
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md->type, md->attribute);
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md->virt_addr = (u64) (unsigned long) va;
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if (!va)
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pr_err("ioremap of 0x%llX failed!\n",
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(unsigned long long)md->phys_addr);
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}
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/*
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* This function will switch the EFI runtime services to virtual mode.
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* Essentially, look through the EFI memmap and map every region that
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* has the runtime attribute bit set in its memory descriptor and update
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* that memory descriptor with the virtual address obtained from ioremap().
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* This enables the runtime services to be called without having to
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* Essentially, we look through the EFI memmap and map every region that
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* has the runtime attribute bit set in its memory descriptor into the
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* ->trampoline_pgd page table using a top-down VA allocation scheme.
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*
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* The old method which used to update that memory descriptor with the
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* virtual address obtained from ioremap() is still supported when the
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* kernel is booted with efi=old_map on its command line. Same old
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* method enabled the runtime services to be called without having to
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* thunk back into physical mode for every invocation.
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*
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* The new method does a pagetable switch in a preemption-safe manner
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* so that we're in a different address space when calling a runtime
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* function. For function arguments passing we do copy the PGDs of the
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* kernel page table into ->trampoline_pgd prior to each call.
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*/
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void __init efi_enter_virtual_mode(void)
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{
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efi_memory_desc_t *md, *prev_md = NULL;
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efi_status_t status;
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void *p, *new_memmap = NULL;
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unsigned long size;
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u64 end, systab, start_pfn, end_pfn;
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void *p, *va, *new_memmap = NULL;
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efi_status_t status;
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u64 end, systab;
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int count = 0;
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efi.systab = NULL;
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@ -768,7 +805,6 @@ void __init efi_enter_virtual_mode(void)
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* We don't do virtual mode, since we don't do runtime services, on
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* non-native EFI
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*/
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if (!efi_is_native()) {
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efi_unmap_memmap();
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return;
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@ -799,6 +835,7 @@ void __init efi_enter_virtual_mode(void)
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continue;
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}
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prev_md = md;
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}
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for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
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@ -808,33 +845,18 @@ void __init efi_enter_virtual_mode(void)
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md->type != EFI_BOOT_SERVICES_DATA)
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continue;
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efi_map_region(md);
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size = md->num_pages << EFI_PAGE_SHIFT;
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end = md->phys_addr + size;
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start_pfn = PFN_DOWN(md->phys_addr);
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end_pfn = PFN_UP(end);
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if (pfn_range_is_mapped(start_pfn, end_pfn)) {
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va = __va(md->phys_addr);
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if (!(md->attribute & EFI_MEMORY_WB))
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efi_memory_uc((u64)(unsigned long)va, size);
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} else
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va = efi_ioremap(md->phys_addr, size,
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md->type, md->attribute);
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md->virt_addr = (u64) (unsigned long) va;
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if (!va) {
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pr_err("ioremap of 0x%llX failed!\n",
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(unsigned long long)md->phys_addr);
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continue;
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}
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systab = (u64) (unsigned long) efi_phys.systab;
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if (md->phys_addr <= systab && systab < end) {
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systab += md->virt_addr - md->phys_addr;
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efi.systab = (efi_system_table_t *) (unsigned long) systab;
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}
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new_memmap = krealloc(new_memmap,
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(count + 1) * memmap.desc_size,
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GFP_KERNEL);
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@ -845,6 +867,9 @@ void __init efi_enter_virtual_mode(void)
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BUG_ON(!efi.systab);
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efi_setup_page_tables();
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efi_sync_low_kernel_mappings();
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status = phys_efi_set_virtual_address_map(
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memmap.desc_size * count,
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memmap.desc_size,
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@ -877,7 +902,8 @@ void __init efi_enter_virtual_mode(void)
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efi.query_variable_info = virt_efi_query_variable_info;
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efi.update_capsule = virt_efi_update_capsule;
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efi.query_capsule_caps = virt_efi_query_capsule_caps;
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if (__supported_pte_mask & _PAGE_NX)
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if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX))
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runtime_code_page_mkexec();
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kfree(new_memmap);
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@ -1007,3 +1033,15 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
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return EFI_SUCCESS;
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}
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EXPORT_SYMBOL_GPL(efi_query_variable_store);
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static int __init parse_efi_cmdline(char *str)
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{
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if (*str == '=')
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str++;
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if (!strncmp(str, "old_map", 7))
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set_bit(EFI_OLD_MEMMAP, &x86_efi_facility);
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return 0;
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}
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early_param("efi", parse_efi_cmdline);
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@ -37,9 +37,16 @@
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* claim EFI runtime service handler exclusively and to duplicate a memory in
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* low memory space say 0 - 3G.
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*/
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static unsigned long efi_rt_eflags;
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void efi_sync_low_kernel_mappings(void) {}
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void efi_setup_page_tables(void) {}
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void __init efi_map_region(efi_memory_desc_t *md)
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{
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old_map_region(md);
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}
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void efi_call_phys_prelog(void)
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{
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struct desc_ptr gdt_descr;
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@ -38,10 +38,28 @@
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#include <asm/efi.h>
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#include <asm/cacheflush.h>
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#include <asm/fixmap.h>
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#include <asm/realmode.h>
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static pgd_t *save_pgd __initdata;
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static unsigned long efi_flags __initdata;
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/*
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* We allocate runtime services regions bottom-up, starting from -4G, i.e.
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* 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
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*/
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static u64 efi_va = -4 * (1UL << 30);
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#define EFI_VA_END (-68 * (1UL << 30))
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/*
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* Scratch space used for switching the pagetable in the EFI stub
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*/
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struct efi_scratch {
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u64 r15;
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u64 prev_cr3;
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pgd_t *efi_pgt;
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bool use_pgd;
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};
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static void __init early_code_mapping_set_exec(int executable)
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{
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efi_memory_desc_t *md;
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@ -65,6 +83,9 @@ void __init efi_call_phys_prelog(void)
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int pgd;
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int n_pgds;
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if (!efi_enabled(EFI_OLD_MEMMAP))
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return;
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early_code_mapping_set_exec(1);
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local_irq_save(efi_flags);
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@ -86,6 +107,10 @@ void __init efi_call_phys_epilog(void)
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*/
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int pgd;
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int n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE);
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if (!efi_enabled(EFI_OLD_MEMMAP))
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return;
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for (pgd = 0; pgd < n_pgds; pgd++)
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set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), save_pgd[pgd]);
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kfree(save_pgd);
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@ -94,6 +119,90 @@ void __init efi_call_phys_epilog(void)
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early_code_mapping_set_exec(0);
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}
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/*
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* Add low kernel mappings for passing arguments to EFI functions.
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*/
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void efi_sync_low_kernel_mappings(void)
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{
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unsigned num_pgds;
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pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
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if (efi_enabled(EFI_OLD_MEMMAP))
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return;
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num_pgds = pgd_index(MODULES_END - 1) - pgd_index(PAGE_OFFSET);
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memcpy(pgd + pgd_index(PAGE_OFFSET),
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init_mm.pgd + pgd_index(PAGE_OFFSET),
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sizeof(pgd_t) * num_pgds);
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}
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void efi_setup_page_tables(void)
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{
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efi_scratch.efi_pgt = (pgd_t *)(unsigned long)real_mode_header->trampoline_pgd;
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if (!efi_enabled(EFI_OLD_MEMMAP))
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efi_scratch.use_pgd = true;
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}
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static void __init __map_region(efi_memory_desc_t *md, u64 va)
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{
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pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
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unsigned long pf = 0, size;
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u64 end;
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if (!(md->attribute & EFI_MEMORY_WB))
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pf |= _PAGE_PCD;
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size = md->num_pages << PAGE_SHIFT;
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end = va + size;
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
void __init efi_map_region(efi_memory_desc_t *md)
|
||||
{
|
||||
unsigned long size = md->num_pages << PAGE_SHIFT;
|
||||
u64 pa = md->phys_addr;
|
||||
|
||||
if (efi_enabled(EFI_OLD_MEMMAP))
|
||||
return old_map_region(md);
|
||||
|
||||
/*
|
||||
* Make sure the 1:1 mappings are present as a catch-all for b0rked
|
||||
* firmware which doesn't update all internal pointers after switching
|
||||
* to virtual mode and would otherwise crap on us.
|
||||
*/
|
||||
__map_region(md, md->phys_addr);
|
||||
|
||||
efi_va -= size;
|
||||
|
||||
/* Is PA 2M-aligned? */
|
||||
if (!(pa & (PMD_SIZE - 1))) {
|
||||
efi_va &= PMD_MASK;
|
||||
} else {
|
||||
u64 pa_offset = pa & (PMD_SIZE - 1);
|
||||
u64 prev_va = efi_va;
|
||||
|
||||
/* get us the same offset within this 2M page */
|
||||
efi_va = (efi_va & PMD_MASK) + pa_offset;
|
||||
|
||||
if (efi_va > prev_va)
|
||||
efi_va -= PMD_SIZE;
|
||||
}
|
||||
|
||||
if (efi_va < EFI_VA_END) {
|
||||
pr_warn(FW_WARN "VA address range overflow!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Do the VA map */
|
||||
__map_region(md, efi_va);
|
||||
md->virt_addr = efi_va;
|
||||
}
|
||||
|
||||
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
|
||||
u32 type, u64 attribute)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -34,10 +34,47 @@
|
|||
mov %rsi, %cr0; \
|
||||
mov (%rsp), %rsp
|
||||
|
||||
/* stolen from gcc */
|
||||
.macro FLUSH_TLB_ALL
|
||||
movq %r15, efi_scratch(%rip)
|
||||
movq %r14, efi_scratch+8(%rip)
|
||||
movq %cr4, %r15
|
||||
movq %r15, %r14
|
||||
andb $0x7f, %r14b
|
||||
movq %r14, %cr4
|
||||
movq %r15, %cr4
|
||||
movq efi_scratch+8(%rip), %r14
|
||||
movq efi_scratch(%rip), %r15
|
||||
.endm
|
||||
|
||||
.macro SWITCH_PGT
|
||||
cmpb $0, efi_scratch+24(%rip)
|
||||
je 1f
|
||||
movq %r15, efi_scratch(%rip) # r15
|
||||
# save previous CR3
|
||||
movq %cr3, %r15
|
||||
movq %r15, efi_scratch+8(%rip) # prev_cr3
|
||||
movq efi_scratch+16(%rip), %r15 # EFI pgt
|
||||
movq %r15, %cr3
|
||||
1:
|
||||
.endm
|
||||
|
||||
.macro RESTORE_PGT
|
||||
cmpb $0, efi_scratch+24(%rip)
|
||||
je 2f
|
||||
movq efi_scratch+8(%rip), %r15
|
||||
movq %r15, %cr3
|
||||
movq efi_scratch(%rip), %r15
|
||||
FLUSH_TLB_ALL
|
||||
2:
|
||||
.endm
|
||||
|
||||
ENTRY(efi_call0)
|
||||
SAVE_XMM
|
||||
subq $32, %rsp
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $32, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -47,7 +84,9 @@ ENTRY(efi_call1)
|
|||
SAVE_XMM
|
||||
subq $32, %rsp
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $32, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -57,7 +96,9 @@ ENTRY(efi_call2)
|
|||
SAVE_XMM
|
||||
subq $32, %rsp
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $32, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -68,7 +109,9 @@ ENTRY(efi_call3)
|
|||
subq $32, %rsp
|
||||
mov %rcx, %r8
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $32, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -80,7 +123,9 @@ ENTRY(efi_call4)
|
|||
mov %r8, %r9
|
||||
mov %rcx, %r8
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $32, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -93,7 +138,9 @@ ENTRY(efi_call5)
|
|||
mov %r8, %r9
|
||||
mov %rcx, %r8
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $48, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
|
|
@ -109,8 +156,15 @@ ENTRY(efi_call6)
|
|||
mov %r8, %r9
|
||||
mov %rcx, %r8
|
||||
mov %rsi, %rcx
|
||||
SWITCH_PGT
|
||||
call *%rdi
|
||||
RESTORE_PGT
|
||||
addq $48, %rsp
|
||||
RESTORE_XMM
|
||||
ret
|
||||
ENDPROC(efi_call6)
|
||||
|
||||
.data
|
||||
ENTRY(efi_scratch)
|
||||
.fill 3,8,0
|
||||
.byte 0
|
||||
|
|
|
|||
|
|
@ -653,6 +653,7 @@ extern int __init efi_setup_pcdp_console(char *);
|
|||
#define EFI_RUNTIME_SERVICES 3 /* Can we use runtime services? */
|
||||
#define EFI_MEMMAP 4 /* Can we use EFI memory map? */
|
||||
#define EFI_64BIT 5 /* Is the firmware 64-bit? */
|
||||
#define EFI_ARCH_1 6 /* First arch-specific bit */
|
||||
|
||||
#ifdef CONFIG_EFI
|
||||
# ifdef CONFIG_X86
|
||||
|
|
|
|||
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