search for: kaddr

...ns(+), 4 deletions(-) diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c index a1e27da54481..0ba3ef809e48 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -1220,10 +1220,10 @@ static inline int getu16_iotlb(const struct vringh *vrh, if (ret < 0) return ret; - kaddr = kmap_atomic(iov.bv_page); + kaddr = kmap_local_page(iov.bv_page); from = kaddr + iov.bv_offset; *val = vringh16_to_cpu(vrh, READ_ONCE(*(__virtio16 *)from)); - kunmap_atomic(kaddr); + kunmap_local(kaddr); return 0; } @@ -1241,10 +1241,10 @@ static inline int putu16_iotlb(const struct vrin...

...} ret = copy_to_iter(src, translated, &iter); if (ret < 0) @@ -1210,20 +1260,37 @@ static inline int copy_to_iotlb(const struct vringh *vrh, void *dst, static inline int getu16_iotlb(const struct vringh *vrh, u16 *val, const __virtio16 *p) { - struct bio_vec iov; - void *kaddr, *from; + struct iotlb_vec ivec; + union { + struct iovec iovec[1]; + struct bio_vec bvec[1]; + } iov; + __virtio16 tmp; int ret; + ivec.iov.iovec = iov.iovec; + ivec.count = 1; + ivec.is_iovec = vrh->use_va; + /* Atomic read is needed for getu16 */ - ret = iotlb_translate(vrh, (u64)(uin...

This series adds support for the use of user virtual addresses in the vDPA simulator devices. The main reason for this change is to lift the pinning of all guest memory. Especially with virtio devices implemented in software. The next step would be to generalize the code in vdpa-sim to allow the implementation of in-kernel software devices. Similar to vhost, but using vDPA so we can reuse the

...10-24.orig/arch/i386/mm/highmem-xen.c 2008-10-27 11:56:39.000000000 +0100 +++ head-2008-10-24/arch/i386/mm/highmem-xen.c 2008-10-27 11:56:59.000000000 +0100 @@ -151,9 +151,56 @@ struct page *kmap_atomic_to_page(void *p return pte_page(*pte); } +void clear_highpage(struct page *page) +{ + void *kaddr; + + if (likely(xen_feature(XENFEAT_highmem_assist)) + && PageHighMem(page)) { + struct mmuext_op meo; + + meo.cmd = MMUEXT_CLEAR_PAGE; + meo.arg1.mfn = pfn_to_mfn(page_to_pfn(page)); + if (HYPERVISOR_mmuext_op(&meo, 1, NULL, DOMID_SELF) == 0) + return; + } + + kaddr = kmap_at...

...ret < 0) > @@ -1210,20 +1260,37 @@ static inline int copy_to_iotlb(const struct vringh *vrh, void *dst, > static inline int getu16_iotlb(const struct vringh *vrh, > u16 *val, const __virtio16 *p) > { > - struct bio_vec iov; > - void *kaddr, *from; > + struct iotlb_vec ivec; > + union { > + struct iovec iovec[1]; > + struct bio_vec bvec[1]; > + } iov; > + __virtio16 tmp; > int ret; > > + ivec.iov.iovec = iov.iovec; > + ivec.count = 1;...

v2: - rebased on Linus' tree, commit ae3419fbac84 ("vc_screen: don't clobber return value in vcs_read") - removed `struct task_struct *owner` param (unused for now, maybe ?useful to support cgroups) [Jason] - add unbind_mm callback [Jason] - call the new unbind_mm callback during the release [Jason] - avoid to call bind_mm callback after the reset, since the device ?is not

This series adds support for the use of user virtual addresses in the vDPA simulator devices. The main reason for this change is to lift the pinning of all guest memory. Especially with virtio devices implemented in software. The next step would be to generalize the code in vdpa-sim to allow the implementation of in-kernel software devices. Similar to vhost, but using vDPA so we can reuse the

...cluded from include/linux/kernel.h:11, from drivers/vhost/vdpa.c:14: include/linux/scatterlist.h: In function 'sg_set_buf': arch/m68k/include/asm/page_mm.h:169:49: warning: ordered comparison of pointer with null pointer [-Wextra] 169 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0)...

On Wed, Nov 29, 2017 at 09:55:22PM +0800, Wei Wang wrote: > Current virtqueue_add API implementation is based on the scatterlist > struct, which uses kaddr. This is inadequate to all the use case of > vring. For example: > - Some usages don't use IOMMU, in this case the user can directly pass > in a physical address in hand, instead of going through the sg > implementation (e.g. the VIRTIO_BALLOON_F_SG feature) > - Sometimes, a...

On Wed, Nov 29, 2017 at 09:55:22PM +0800, Wei Wang wrote: > Current virtqueue_add API implementation is based on the scatterlist > struct, which uses kaddr. This is inadequate to all the use case of > vring. For example: > - Some usages don't use IOMMU, in this case the user can directly pass > in a physical address in hand, instead of going through the sg > implementation (e.g. the VIRTIO_BALLOON_F_SG feature) > - Sometimes, a...

On Tue, Mar 12, 2019 at 03:02:54PM -0700, James Bottomley wrote: > I'm sure there must be workarounds elsewhere in the other arch code > otherwise things like this, which appear all over drivers/, wouldn't > work: > > drivers/scsi/isci/request.c:1430 > > kaddr = kmap_atomic(page); > memcpy(kaddr + sg->offset, src_addr, copy_len); > kunmap_atomic(kaddr); > Are you sure "page" is an userland page with an alias address? sg->page_link = (unsigned long)virt_to_page(addr); page_link seems to point to kernel memory. I found an a...

...c 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -2426,6 +2426,59 @@ done: return ret; } +static int key_search(struct extent_buffer *b, struct btrfs_key *key, + int level, int *prev_cmp, int *slot) +{ + unsigned long eb_offset = 0; + unsigned long len_left = b->len; + char *kaddr = NULL; + unsigned long map_start = 0; + unsigned long map_len = 0; + unsigned long offset; + struct btrfs_disk_key *k = NULL; + struct btrfs_disk_key unaligned; + + if (*prev_cmp != 0) { + *prev_cmp = bin_search(b, key, level, slot); + return *prev_cmp; + } + + if (level == 0) + offset = offset...

...pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX + && pfn_t_to_page(pfn)->pgmap == pgmap + && pfn_t_to_page(end_pfn)->pgmap == pgmap + && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr)) + && pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr))) dax_enabled = true; put_dev_pagemap(pgmap); Thanks, Pankaj

...pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX + && pfn_t_to_page(pfn)->pgmap == pgmap + && pfn_t_to_page(end_pfn)->pgmap == pgmap + && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr)) + && pfn_t_to_pfn(end_pfn) == PHYS_PFN(__pa(end_kaddr))) dax_enabled = true; put_dev_pagemap(pgmap); Thanks, Pankaj

...addr = vma->vm_start; > + nr_pages = (vma->vm_end - addr - 1) / PAGE_SIZE + 1; > + while (nr_pages) { > + int count = min(nr_pages, max_pages_per_loop); > + void *kaddr; > + > + count = get_user_pages_remote(p, mm, addr, > + count, gup_flags, > + pages, NULL, NULL); get_user_pages_remote() can wait for disk I/O (for...

...S2_I(inode)->ip_clusters); + mlog(ML_ERROR, "Size %llu, clusters %u\n", + (unsigned long long)i_size_read(inode), + OCFS2_I(inode)->ip_clusters); dump_stack(); } @@ -217,11 +219,16 @@ int ocfs2_read_inline_data(struct inode *inode, struct page *page, void *kaddr; loff_t size; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + int status = 0; + + mlog_entry("(%llu, %lu, %llu)\n", OCFS2_I(inode)->ip_blkno, + page->index, (unsigned long long)di_bh->b_blocknr); if (!(le16_to_cpu(di->i_dyn_features) & OCFS...

This patch set aims to support the vcpu_is_preempted() functionality under KVM/arm64, which allowing the guest to obtain the VCPU is currently running or not. This will enhance lock performance on overcommitted hosts (more runnable VCPUs than physical CPUs in the system) as doing busy waits for preempted VCPUs will hurt system performance far worse than early yielding. We have observed some

...S2_I(inode)->ip_clusters); + mlog(ML_ERROR, "Size %llu, clusters %u\n", + (unsigned long long)i_size_read(inode), + OCFS2_I(inode)->ip_clusters); dump_stack(); } @@ -217,11 +219,17 @@ int ocfs2_read_inline_data(struct inode *inode, struct page *page, void *kaddr; loff_t size; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + int status = 0; + + mlog_entry("(%llu, %lu, %llu)\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + page->index, (unsigned long long)di_bh->b_blocknr); if (!(le16_to_cpu(di->...

Current virtqueue_add API implementation is based on the scatterlist struct, which uses kaddr. This is inadequate to all the use case of vring. For example: - Some usages don't use IOMMU, in this case the user can directly pass in a physical address in hand, instead of going through the sg implementation (e.g. the VIRTIO_BALLOON_F_SG feature) - Sometimes, a guest physical page may n...

...c3f41 include/asm-ia64/page.h Linus Torvalds 2005-04-16 94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE ^1da177e4c3f41 include/asm-ia64/page.h Linus Torvalds 2005-04-16 95 ^1da177e4c3f41 include/asm-ia64/page.h Linus Torvalds 2005-04-16 96 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) ^1da177e4c3f41 include/asm-ia64/page.h Linus Torvalds 2005-04-16 97 ^1da177e4c3f41 include/asm-ia64/page.h Linus Torvalds 2005-04-16 98 #ifdef CONFIG_VIRTUAL_MEM_MAP ^1da177e4c3f41 include/asm-ia64/page.h Linus Torvalds 2005...