search for: fixed_address

...module.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -138,6 +139,10 @@ void set_pmd_pfn(unsigned long vaddr, un __flush_tlb_one(vaddr); } +static int nr_fixmaps = 0; +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); + void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) { unsigned long address = __fix_to_virt(idx); @@ -147,6 +152,13 @@ void __set_fixmap (enum fixed_addresses return; } set_pte_pfn(address, phys >> PAGE_SHIFT, flags); + nr_fixmaps++; +} + +void set_fixaddr_top(unsigned long top) +{ + BUG_ON...

...module.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -138,6 +139,10 @@ void set_pmd_pfn(unsigned long vaddr, un __flush_tlb_one(vaddr); } +static int nr_fixmaps = 0; +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); + void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) { unsigned long address = __fix_to_virt(idx); @@ -147,6 +152,13 @@ void __set_fixmap (enum fixed_addresses return; } set_pte_pfn(address, phys >> PAGE_SHIFT, flags); + nr_fixmaps++; +} + +void set_fixaddr_top(unsigned long top) +{ + BUG_ON...

...module.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -138,6 +139,10 @@ void set_pmd_pfn(unsigned long vaddr, un __flush_tlb_one(vaddr); } +static int nr_fixmaps = 0; +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); + void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) { unsigned long address = __fix_to_virt(idx); @@ -147,6 +152,13 @@ void __set_fixmap (enum fixed_addresses return; } set_pte_pfn(address, phys >> PAGE_SHIFT, flags); + nr_fixmaps++; +} + +void set_fixaddr_top(unsigned long top) +{ + BUG_ON...

...module.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -138,6 +139,10 @@ void set_pmd_pfn(unsigned long vaddr, un __flush_tlb_one(vaddr); } +static int nr_fixmaps = 0; +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); + void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) { unsigned long address = __fix_to_virt(idx); @@ -147,6 +152,13 @@ void __set_fixmap (enum fixed_addresses return; } set_pte_pfn(address, phys >> PAGE_SHIFT, flags); + nr_fixmaps++; +} + +void set_fixaddr_top(unsigned long top) +{ + BUG_ON...

...and it has to accommodate user address space, kernel address --- a/arch/nds32/include/asm/fixmap.h +++ b/arch/nds32/include/asm/fixmap.h @@ -6,7 +6,7 @@ #ifdef CONFIG_HIGHMEM #include <linux/threads.h> -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> #endif enum fixed_addresses { @@ -14,7 +14,7 @@ enum fixed_addresses { FIX_KMAP_RESERVED, FIX_KMAP_BEGIN, #ifdef CONFIG_HIGHMEM - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS), + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, #endif FIX_EARLYCON_MEM_BASE, __end_of_fixed_addresses --- a/arch/n...

...I_COMMAND, PCI_COMMAND_IO); } static void ns16550_setup_preirq(struct ns16550 *uart) @@ -265,7 +271,17 @@ static void __init ns16550_init_preirq(s /* I/O ports are distinguished by their size (16 bits). */ if ( uart->io_base >= 0x10000 ) + { +#ifdef CONFIG_X86 + enum fixed_addresses idx = FIX_COM_BEGIN + (uart - ns16550_com); + + set_fixmap_nocache(idx, uart->io_base); + uart->remapped_io_base = (void __iomem *)fix_to_virt(idx); + uart->remapped_io_base += uart->io_base & ~PAGE_MASK; +#else uart->remapped_io_base = (char *)ior...

...+ arch/x86/xen/mmu.c | 4 +--- 4 files changed, 12 insertions(+), 23 deletions(-) diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index a09c285..51b9e32 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -104,9 +104,7 @@ enum fixed_addresses { FIX_LI_PCIA, /* Lithium PCI Bridge A */ FIX_LI_PCIB, /* Lithium PCI Bridge B */ #endif -#ifdef CONFIG_X86_F00F_BUG - FIX_F00F_IDT, /* Virtual mapping for IDT */ -#endif + FIX_RO_IDT, /* Virtual mapping for read-only IDT */ #ifdef CONFIG_X86_CYCLONE_TIMER FIX_CYCLONE_TIMER, /*cyclone tim...

...+ arch/x86/xen/mmu.c | 4 +--- 4 files changed, 12 insertions(+), 23 deletions(-) diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index a09c285..51b9e32 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -104,9 +104,7 @@ enum fixed_addresses { FIX_LI_PCIA, /* Lithium PCI Bridge A */ FIX_LI_PCIB, /* Lithium PCI Bridge B */ #endif -#ifdef CONFIG_X86_F00F_BUG - FIX_F00F_IDT, /* Virtual mapping for IDT */ -#endif + FIX_RO_IDT, /* Virtual mapping for read-only IDT */ #ifdef CONFIG_X86_CYCLONE_TIMER FIX_CYCLONE_TIMER, /*cyclone tim...

This most curious patch allows the fixmap on i386 to be unfixed. The = result is that we can create a dynamically sizable hole at the top of = kernel linear address space. I know at least some virtualization = developers are interested in being able to achieve this to achieve = run-time sizing of a hole in which a hypervisor can live, or at least to = test out the performance

This most curious patch allows the fixmap on i386 to be unfixed. The = result is that we can create a dynamically sizable hole at the top of = kernel linear address space. I know at least some virtualization = developers are interested in being able to achieve this to achieve = run-time sizing of a hole in which a hypervisor can live, or at least to = test out the performance

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

...sh/include/asm/fixmap.h @@ -13,9 +13,6 @@ #include <linux/kernel.h> #include <linux/threads.h> #include <asm/page.h> -#ifdef CONFIG_HIGHMEM -#include <asm/kmap_types.h> -#endif /* * Here we define all the compile-time 'special' virtual @@ -53,11 +50,6 @@ enum fixed_addresses { FIX_CMAP_BEGIN, FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS) - 1, -#ifdef CONFIG_HIGHMEM - FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, -#endif - #ifdef CONFIG_IOREMAP_FIXED /* * FIX...

...(*(kmap_pte-idx))) BUG(); -#endif set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); - __flush_tlb_one(vaddr); return (void*) vaddr; } void kunmap_atomic(void *kvaddr, enum km_type type) { -#ifdef CONFIG_DEBUG_HIGHMEM unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id(); +#ifdef CONFIG_DEBUG_HIGHMEM if (vaddr >= PAGE_OFFSET && vaddr < (unsigned long)high_memory) { dec_preempt_count(); preempt_check_resched(); @@ -68,14 +65,14 @@ void kunmap_atomic(void *kvaddr, enum km if (vaddr != __fix_to_v...

Hi Andrew, This series of patches lays the basic ground work for the paravirtualized kernel patches coming later on. I think this lot is ready for the rough-and-tumble world of the -mm tree. The main change from the last posting is that all the page-table related patches have been moved out, and will be posted separately. Also, the off-by-one in reserving the top of address space has been

Hi Andrew, This series of patches lays the basic ground work for the paravirtualized kernel patches coming later on. I think this lot is ready for the rough-and-tumble world of the -mm tree. The main change from the last posting is that all the page-table related patches have been moved out, and will be posted separately. Also, the off-by-one in reserving the top of address space has been

Paravirt ops is currently only capable of either replacing a lot of Linux internal code or none at all. The are users that don't need all of the possibilities pv-ops delivers though. On KVM for example we're perfectly fine not using the PV MMU, thus not touching any MMU code. That way we don't have to improve pv-ops to become fast, we just don't compile the MMU parts in! This

Paravirt ops is currently only capable of either replacing a lot of Linux internal code or none at all. The are users that don't need all of the possibilities pv-ops delivers though. On KVM for example we're perfectly fine not using the PV MMU, thus not touching any MMU code. That way we don't have to improve pv-ops to become fast, we just don't compile the MMU parts in! This

...tch (len) { At the time of boot the PCI mmconfig space is accessed thousands times, one after another; that causes fixed map & unmap continuously very fast for a long time. Currently the fix-mapped virtual address for Shared_info_page for dom0 & the PCI mmconfig page are adjacent in the fixed_addresses in the fixedmap.h. #ifdef CONFIG_PCI_MMCONFIG FIX_PCIE_MCFG, #endif FIX_SHARED_INFO, FIX_GNTTAB_BEGIN, I am suspecting that this is causing a race condition because of writable page tables. While accessing the PCI mmconfig on i386 the dom0 kernel (cpu 0) is continuously rewriting...