search for: config_arch_has_pte_special

...on(+), 1 deletion(-) > > diff --git a/mm/hmm.c b/mm/hmm.c > index 06041d4399ff..7217912bef13 100644 > --- a/mm/hmm.c > +++ b/mm/hmm.c > @@ -532,7 +532,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, > return -EBUSY; > } else if (IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) && pte_special(pte)) { > *pfn = range->values[HMM_PFN_SPECIAL]; > - return -EFAULT; > + return is_zero_pfn(pte_pfn(pte)) ? 0 : -EFAULT; Any chance to just use a normal if here: if (!is_zero_pfn(pte_pfn(pte))) return -EFAULT; return 0;

.../hmm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/hmm.c b/mm/hmm.c index 06041d4399ff..7217912bef13 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -532,7 +532,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, return -EBUSY; } else if (IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) && pte_special(pte)) { *pfn = range->values[HMM_PFN_SPECIAL]; - return -EFAULT; + return is_zero_pfn(pte_pfn(pte)) ? 0 : -EFAULT; } *pfn = hmm_device_entry_from_pfn(range, pte_pfn(pte)) | cpu_flags; -- 2.20.1

...goto fault; if (pte_devmap(pte)) { - hmm_vma_walk->pgmap = get_dev_pagemap(pte_pfn(pte), - hmm_vma_walk->pgmap); - if (unlikely(!hmm_vma_walk->pgmap)) + *pgmap = get_dev_pagemap(pte_pfn(pte), *pgmap); + if (unlikely(!*pgmap)) return -EBUSY; } else if (IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) && pte_special(pte)) { *pfn = range->values[HMM_PFN_SPECIAL]; @@ -604,10 +600,10 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, return 0; fault: - if (hmm_vma_walk->pgmap) { - put_dev_pagemap(hmm_vma_walk->pgmap); - hmm_vma_walk->pgmap = NU...

...ault(&ext4_iomap_ops) dax_iomap_pte_fault() ops->iomap_begin() // ext4_iomap_begin() ext4_map_blocks() ext4_set_iomap() dax_iomap_pfn() dax_insert_entry() vmf_insert_mixed(pfn) __vm_insert_mixed() if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL) && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) insert_page() get_page(page) // XXX would trigger VM_BUG_ON_PAGE() page_add_file_rmap() set_pte_at() else insert_pfn()...

These changes are based on Jason's latest hmm branch. Patch 1 was previously posted here [1] but was dropped from the orginal series. Hopefully, the tests will reduce concerns about edge conditions. I'm sure more tests could be usefully added but I thought this was a good starting point. [1] https://lore.kernel.org/linux-mm/20190726005650.2566-6-rcampbell at nvidia.com/ Ralph Campbell

Hi Jérôme, Ben, Felix and Jason, below is a series against the hmm tree which cleans up various minor bits and allows HMM_MIRROR to be built on all architectures. Diffstat: 11 files changed, 94 insertions(+), 210 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git hmm-cleanups.2 Gitweb:

Hi Jérôme, Ben, Felxi and Jason, below is a series against the hmm tree which cleans up various minor bits and allows HMM_MIRROR to be built on all architectures. Diffstat: 7 files changed, 81 insertions(+), 171 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git hmm-cleanups Gitweb:

...CONFIG_ZPOOL=y CONFIG_ZBUD=y CONFIG_Z3FOLD=y CONFIG_ZSMALLOC=y CONFIG_PGTABLE_MAPPING=y # CONFIG_ZSMALLOC_STAT is not set CONFIG_GENERIC_EARLY_IOREMAP=y # CONFIG_IDLE_PAGE_TRACKING is not set CONFIG_ARCH_HAS_PTE_DEVMAP=y CONFIG_FRAME_VECTOR=y # CONFIG_PERCPU_STATS is not set CONFIG_GUP_BENCHMARK=y CONFIG_ARCH_HAS_PTE_SPECIAL=y CONFIG_MAPPING_DIRTY_HELPERS=y # end of Memory Management options CONFIG_NET=y # # Networking options # CONFIG_PACKET=y CONFIG_PACKET_DIAG=y # CONFIG_UNIX is not set CONFIG_XDP_SOCKETS=y CONFIG_XDP_SOCKETS_DIAG=y # CONFIG_INET is not set # CONFIG_NETWORK_SECMARK is not set CONFIG_NET_PTP_CLASSI...

...IG_CMA is not set # CONFIG_ZPOOL is not set CONFIG_ZBUD=y # CONFIG_ZSMALLOC is not set CONFIG_GENERIC_EARLY_IOREMAP=y CONFIG_IDLE_PAGE_TRACKING=y CONFIG_ARCH_HAS_PTE_DEVMAP=y CONFIG_FRAME_VECTOR=y CONFIG_ARCH_USES_HIGH_VMA_FLAGS=y CONFIG_ARCH_HAS_PKEYS=y CONFIG_PERCPU_STATS=y CONFIG_GUP_BENCHMARK=y CONFIG_ARCH_HAS_PTE_SPECIAL=y # end of Memory Management options # CONFIG_NET is not set CONFIG_HAVE_EBPF_JIT=y # # Device Drivers # CONFIG_HAVE_EISA=y CONFIG_EISA=y CONFIG_EISA_VLB_PRIMING=y CONFIG_EISA_PCI_EISA=y CONFIG_EISA_VIRTUAL_ROOT=y CONFIG_EISA_NAMES=y CONFIG_HAVE_PCI=y CONFIG_PCI=y CONFIG_PCI_DOMAINS=y # CONFIG_PC...

...IG_CMA is not set # CONFIG_ZPOOL is not set CONFIG_ZBUD=y # CONFIG_ZSMALLOC is not set CONFIG_GENERIC_EARLY_IOREMAP=y CONFIG_IDLE_PAGE_TRACKING=y CONFIG_ARCH_HAS_PTE_DEVMAP=y CONFIG_FRAME_VECTOR=y CONFIG_ARCH_USES_HIGH_VMA_FLAGS=y CONFIG_ARCH_HAS_PKEYS=y CONFIG_PERCPU_STATS=y CONFIG_GUP_BENCHMARK=y CONFIG_ARCH_HAS_PTE_SPECIAL=y # end of Memory Management options # CONFIG_NET is not set CONFIG_HAVE_EBPF_JIT=y # # Device Drivers # CONFIG_HAVE_EISA=y CONFIG_EISA=y CONFIG_EISA_VLB_PRIMING=y CONFIG_EISA_PCI_EISA=y CONFIG_EISA_VIRTUAL_ROOT=y CONFIG_EISA_NAMES=y CONFIG_HAVE_PCI=y CONFIG_PCI=y CONFIG_PCI_DOMAINS=y # CONFIG_PC...

...is not set CONFIG_ZPOOL=m CONFIG_ZBUD=y CONFIG_Z3FOLD=m CONFIG_ZSMALLOC=y CONFIG_PGTABLE_MAPPING=y CONFIG_ZSMALLOC_STAT=y CONFIG_GENERIC_EARLY_IOREMAP=y # CONFIG_IDLE_PAGE_TRACKING is not set CONFIG_ARCH_HAS_PTE_DEVMAP=y CONFIG_FRAME_VECTOR=y # CONFIG_PERCPU_STATS is not set CONFIG_GUP_BENCHMARK=y CONFIG_ARCH_HAS_PTE_SPECIAL=y # end of Memory Management options # CONFIG_NET is not set CONFIG_HAVE_EBPF_JIT=y # # Device Drivers # CONFIG_HAVE_EISA=y # CONFIG_EISA is not set CONFIG_HAVE_PCI=y CONFIG_PCI=y CONFIG_PCI_DOMAINS=y CONFIG_PCIEPORTBUS=y # CONFIG_HOTPLUG_PCI_PCIE is not set # CONFIG_PCIEAER is not set CONFIG_PCI...

This patch series aims to move the logical block size checking to the block code. This was inspired by missing check for valid logical block size in virtio-blk which causes the kernel to crash in a weird way later on when it is invalid. I added blk_is_valid_logical_block_size which returns true iff the block size is one of supported sizes. I added this check to virtio-blk, and also converted

This patch series aims to move the logical block size checking to the block code. This was inspired by missing check for valid logical block size in virtio-blk which causes the kernel to crash in a weird way later on when it is invalid. I added blk_is_valid_logical_block_size which returns true iff the block size is one of supported sizes. I added this check to virtio-blk, and also converted

Hi, here is the next version of changes to enable Linux to run as an SEV-ES guest. The code was rebased to v5.7-rc3 and got a fair number of changes since the last version. What is SEV-ES ============== SEV-ES is an acronym for 'Secure Encrypted Virtualization - Encrypted State' and means a hardware feature of AMD processors which hides the register state of VCPUs to the hypervisor by

Hi, here is the next version of changes to enable Linux to run as an SEV-ES guest. The code was rebased to v5.7-rc3 and got a fair number of changes since the last version. What is SEV-ES ============== SEV-ES is an acronym for 'Secure Encrypted Virtualization - Encrypted State' and means a hardware feature of AMD processors which hides the register state of VCPUs to the hypervisor by