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vmcore: convert copy_oldmem_page() to take an iov_iter
Patch series "Convert vmcore to use an iov_iter", v5. For some reason several people have been sending bad patches to fix compiler warnings in vmcore recently. Here's how it should be done. Compile-tested only on x86. As noted in the first patch, s390 should take this conversion a bit further, but I'm not inclined to do that work myself. This patch (of 3): Instead of passing in a 'buf' and 'userbuf' argument, pass in an iov_iter. s390 needs more work to pass the iov_iter down further, or refactor, but I'd be more comfortable if someone who can test on s390 did that work. It's more convenient to convert the whole of read_from_oldmem() to take an iov_iter at the same time, so rename it to read_from_oldmem_iter() and add a temporary read_from_oldmem() wrapper that creates an iov_iter. Link: https://lkml.kernel.org/r/20220408090636.560886-1-bhe@redhat.com Link: https://lkml.kernel.org/r/20220408090636.560886-2-bhe@redhat.com Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Baoquan He <bhe@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
parent
04d168c6d4
commit
5d8de293c2
@ -14,22 +14,10 @@
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#include <linux/crash_dump.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/uio.h>
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/**
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* copy_oldmem_page() - copy one page from old kernel memory
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* @pfn: page frame number to be copied
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* @buf: buffer where the copied page is placed
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page
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* @userbuf: if set, @buf is int he user address space
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*
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* This function copies one page from old kernel memory into buffer pointed by
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* @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes
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* copied or negative error in case of failure.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset,
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int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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@ -40,14 +28,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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if (!vaddr)
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return -ENOMEM;
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if (userbuf) {
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if (copy_to_user(buf, vaddr + offset, csize)) {
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iounmap(vaddr);
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return -EFAULT;
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}
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} else {
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memcpy(buf, vaddr + offset, csize);
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}
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csize = copy_to_iter(vaddr + offset, csize, iter);
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iounmap(vaddr);
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return csize;
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@ -9,25 +9,11 @@
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#include <linux/crash_dump.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/memblock.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <asm/memory.h>
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/**
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* copy_oldmem_page() - copy one page from old kernel memory
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* @pfn: page frame number to be copied
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* @buf: buffer where the copied page is placed
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page
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* @userbuf: if set, @buf is in a user address space
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*
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* This function copies one page from old kernel memory into buffer pointed by
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* @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes
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* copied or negative error in case of failure.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset,
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int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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@ -38,14 +24,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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if (!vaddr)
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return -ENOMEM;
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if (userbuf) {
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if (copy_to_user((char __user *)buf, vaddr + offset, csize)) {
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memunmap(vaddr);
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return -EFAULT;
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}
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} else {
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memcpy(buf, vaddr + offset, csize);
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}
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csize = copy_to_iter(vaddr + offset, csize, iter);
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memunmap(vaddr);
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@ -10,42 +10,18 @@
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/crash_dump.h>
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#include <linux/uio.h>
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#include <asm/page.h>
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#include <linux/uaccess.h>
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel. We stitch up a pte, similar to kmap_atomic.
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*
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* Calling copy_to_user() in atomic context is not desirable. Hence first
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* copying the data to a pre-allocated kernel page and then copying to user
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* space in non-atomic context.
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*/
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ssize_t
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copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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if (!csize)
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return 0;
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vaddr = __va(pfn<<PAGE_SHIFT);
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if (userbuf) {
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if (copy_to_user(buf, (vaddr + offset), csize)) {
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return -EFAULT;
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}
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} else
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memcpy(buf, (vaddr + offset), csize);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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return csize;
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}
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@ -1,22 +1,10 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/highmem.h>
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#include <linux/crash_dump.h>
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#include <linux/uio.h>
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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@ -24,14 +12,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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return 0;
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vaddr = kmap_local_pfn(pfn);
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if (!userbuf) {
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memcpy(buf, vaddr + offset, csize);
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} else {
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if (copy_to_user(buf, vaddr + offset, csize))
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csize = -EFAULT;
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}
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csize = copy_to_iter(vaddr + offset, csize, iter);
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kunmap_local(vaddr);
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return csize;
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@ -16,7 +16,7 @@
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#include <asm/kdump.h>
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#include <asm/prom.h>
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#include <asm/firmware.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <asm/rtas.h>
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#include <asm/inst.h>
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@ -68,33 +68,8 @@ void __init setup_kdump_trampoline(void)
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}
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#endif /* CONFIG_NONSTATIC_KERNEL */
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static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize,
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unsigned long offset, int userbuf)
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{
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if (userbuf) {
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if (copy_to_user((char __user *)buf, (vaddr + offset), csize))
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return -EFAULT;
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} else
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memcpy(buf, (vaddr + offset), csize);
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return csize;
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}
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel. We stitch up a pte, similar to kmap_atomic.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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phys_addr_t paddr;
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@ -107,10 +82,10 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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if (memblock_is_region_memory(paddr, csize)) {
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vaddr = __va(paddr);
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csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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} else {
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vaddr = ioremap_cache(paddr, PAGE_SIZE);
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csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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iounmap(vaddr);
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}
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@ -7,22 +7,10 @@
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#include <linux/crash_dump.h>
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#include <linux/io.h>
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#include <linux/uio.h>
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/**
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* copy_oldmem_page() - copy one page from old kernel memory
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* @pfn: page frame number to be copied
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* @buf: buffer where the copied page is placed
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page
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* @userbuf: if set, @buf is in a user address space
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*
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* This function copies one page from old kernel memory into buffer pointed by
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* @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes
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* copied or negative error in case of failure.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset,
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int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void *vaddr;
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@ -33,13 +21,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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if (!vaddr)
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return -ENOMEM;
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if (userbuf) {
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if (copy_to_user((char __user *)buf, vaddr + offset, csize)) {
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memunmap(vaddr);
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return -EFAULT;
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}
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} else
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memcpy(buf, vaddr + offset, csize);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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memunmap(vaddr);
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return csize;
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@ -15,6 +15,7 @@
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#include <linux/slab.h>
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#include <linux/memblock.h>
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#include <linux/elf.h>
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#include <linux/uio.h>
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#include <asm/asm-offsets.h>
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#include <asm/os_info.h>
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#include <asm/elf.h>
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@ -212,8 +213,8 @@ static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)
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/*
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* Copy one page from "oldmem"
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
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unsigned long offset)
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{
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unsigned long src;
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int rc;
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@ -221,10 +222,12 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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if (!csize)
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return 0;
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src = pfn_to_phys(pfn) + offset;
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if (userbuf)
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rc = copy_oldmem_user((void __force __user *) buf, src, csize);
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/* XXX: pass the iov_iter down to a common function */
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if (iter_is_iovec(iter))
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rc = copy_oldmem_user(iter->iov->iov_base, src, csize);
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else
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rc = copy_oldmem_kernel((void *) buf, src, csize);
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rc = copy_oldmem_kernel(iter->kvec->iov_base, src, csize);
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return rc;
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}
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@ -8,23 +8,11 @@
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#include <linux/errno.h>
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#include <linux/crash_dump.h>
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#include <linux/io.h>
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#include <linux/uio.h>
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#include <linux/uaccess.h>
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel. We stitch up a pte, similar to kmap_atomic.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void __iomem *vaddr;
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@ -32,15 +20,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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return 0;
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vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
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if (userbuf) {
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if (copy_to_user((void __user *)buf, (vaddr + offset), csize)) {
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iounmap(vaddr);
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return -EFAULT;
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}
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} else
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memcpy(buf, (vaddr + offset), csize);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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iounmap(vaddr);
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return csize;
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}
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@ -10,8 +10,7 @@
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#include <linux/errno.h>
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#include <linux/highmem.h>
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#include <linux/crash_dump.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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static inline bool is_crashed_pfn_valid(unsigned long pfn)
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{
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@ -29,21 +28,8 @@ static inline bool is_crashed_pfn_valid(unsigned long pfn)
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#endif
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}
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there might be no pte mapped
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* in the current kernel.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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unsigned long offset, int userbuf)
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
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unsigned long offset)
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{
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void *vaddr;
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@ -54,14 +40,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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return -EFAULT;
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vaddr = kmap_local_pfn(pfn);
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if (!userbuf) {
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memcpy(buf, vaddr + offset, csize);
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} else {
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if (copy_to_user(buf, vaddr + offset, csize))
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csize = -EFAULT;
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}
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csize = copy_to_iter(vaddr + offset, csize, iter);
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kunmap_local(vaddr);
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return csize;
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@ -8,12 +8,12 @@
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#include <linux/errno.h>
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#include <linux/crash_dump.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <linux/io.h>
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#include <linux/cc_platform.h>
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static ssize_t __copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
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unsigned long offset, int userbuf,
|
||||
static ssize_t __copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
|
||||
size_t csize, unsigned long offset,
|
||||
bool encrypted)
|
||||
{
|
||||
void *vaddr;
|
||||
@ -29,46 +29,27 @@ static ssize_t __copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
|
||||
if (!vaddr)
|
||||
return -ENOMEM;
|
||||
|
||||
if (userbuf) {
|
||||
if (copy_to_user((void __user *)buf, vaddr + offset, csize)) {
|
||||
iounmap((void __iomem *)vaddr);
|
||||
return -EFAULT;
|
||||
}
|
||||
} else
|
||||
memcpy(buf, vaddr + offset, csize);
|
||||
csize = copy_to_iter(vaddr + offset, csize, iter);
|
||||
|
||||
iounmap((void __iomem *)vaddr);
|
||||
return csize;
|
||||
}
|
||||
|
||||
/**
|
||||
* copy_oldmem_page - copy one page of memory
|
||||
* @pfn: page frame number to be copied
|
||||
* @buf: target memory address for the copy; this can be in kernel address
|
||||
* space or user address space (see @userbuf)
|
||||
* @csize: number of bytes to copy
|
||||
* @offset: offset in bytes into the page (based on pfn) to begin the copy
|
||||
* @userbuf: if set, @buf is in user address space, use copy_to_user(),
|
||||
* otherwise @buf is in kernel address space, use memcpy().
|
||||
*
|
||||
* Copy a page from the old kernel's memory. For this page, there is no pte
|
||||
* mapped in the current kernel. We stitch up a pte, similar to kmap_atomic.
|
||||
*/
|
||||
ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
|
||||
unsigned long offset, int userbuf)
|
||||
ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
|
||||
unsigned long offset)
|
||||
{
|
||||
return __copy_oldmem_page(pfn, buf, csize, offset, userbuf, false);
|
||||
return __copy_oldmem_page(iter, pfn, csize, offset, false);
|
||||
}
|
||||
|
||||
/**
|
||||
/*
|
||||
* copy_oldmem_page_encrypted - same as copy_oldmem_page() above but ioremap the
|
||||
* memory with the encryption mask set to accommodate kdump on SME-enabled
|
||||
* machines.
|
||||
*/
|
||||
ssize_t copy_oldmem_page_encrypted(unsigned long pfn, char *buf, size_t csize,
|
||||
unsigned long offset, int userbuf)
|
||||
ssize_t copy_oldmem_page_encrypted(struct iov_iter *iter, unsigned long pfn,
|
||||
size_t csize, unsigned long offset)
|
||||
{
|
||||
return __copy_oldmem_page(pfn, buf, csize, offset, userbuf, true);
|
||||
return __copy_oldmem_page(iter, pfn, csize, offset, true);
|
||||
}
|
||||
|
||||
ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
|
||||
|
@ -26,6 +26,7 @@
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/uio.h>
|
||||
#include <linux/cc_platform.h>
|
||||
#include <asm/io.h>
|
||||
#include "internal.h"
|
||||
@ -128,9 +129,8 @@ static int open_vmcore(struct inode *inode, struct file *file)
|
||||
}
|
||||
|
||||
/* Reads a page from the oldmem device from given offset. */
|
||||
ssize_t read_from_oldmem(char *buf, size_t count,
|
||||
u64 *ppos, int userbuf,
|
||||
bool encrypted)
|
||||
static ssize_t read_from_oldmem_iter(struct iov_iter *iter, size_t count,
|
||||
u64 *ppos, bool encrypted)
|
||||
{
|
||||
unsigned long pfn, offset;
|
||||
size_t nr_bytes;
|
||||
@ -152,29 +152,23 @@ ssize_t read_from_oldmem(char *buf, size_t count,
|
||||
|
||||
/* If pfn is not ram, return zeros for sparse dump files */
|
||||
if (!pfn_is_ram(pfn)) {
|
||||
tmp = 0;
|
||||
if (!userbuf)
|
||||
memset(buf, 0, nr_bytes);
|
||||
else if (clear_user(buf, nr_bytes))
|
||||
tmp = -EFAULT;
|
||||
tmp = iov_iter_zero(nr_bytes, iter);
|
||||
} else {
|
||||
if (encrypted)
|
||||
tmp = copy_oldmem_page_encrypted(pfn, buf,
|
||||
tmp = copy_oldmem_page_encrypted(iter, pfn,
|
||||
nr_bytes,
|
||||
offset,
|
||||
userbuf);
|
||||
offset);
|
||||
else
|
||||
tmp = copy_oldmem_page(pfn, buf, nr_bytes,
|
||||
offset, userbuf);
|
||||
tmp = copy_oldmem_page(iter, pfn, nr_bytes,
|
||||
offset);
|
||||
}
|
||||
if (tmp < 0) {
|
||||
if (tmp < nr_bytes) {
|
||||
srcu_read_unlock(&vmcore_cb_srcu, idx);
|
||||
return tmp;
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
*ppos += nr_bytes;
|
||||
count -= nr_bytes;
|
||||
buf += nr_bytes;
|
||||
read += nr_bytes;
|
||||
++pfn;
|
||||
offset = 0;
|
||||
@ -184,6 +178,27 @@ ssize_t read_from_oldmem(char *buf, size_t count,
|
||||
return read;
|
||||
}
|
||||
|
||||
ssize_t read_from_oldmem(char *buf, size_t count,
|
||||
u64 *ppos, int userbuf,
|
||||
bool encrypted)
|
||||
{
|
||||
struct iov_iter iter;
|
||||
struct iovec iov;
|
||||
struct kvec kvec;
|
||||
|
||||
if (userbuf) {
|
||||
iov.iov_base = (__force void __user *)buf;
|
||||
iov.iov_len = count;
|
||||
iov_iter_init(&iter, READ, &iov, 1, count);
|
||||
} else {
|
||||
kvec.iov_base = buf;
|
||||
kvec.iov_len = count;
|
||||
iov_iter_kvec(&iter, READ, &kvec, 1, count);
|
||||
}
|
||||
|
||||
return read_from_oldmem_iter(&iter, count, ppos, encrypted);
|
||||
}
|
||||
|
||||
/*
|
||||
* Architectures may override this function to allocate ELF header in 2nd kernel
|
||||
*/
|
||||
@ -228,11 +243,10 @@ int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma,
|
||||
/*
|
||||
* Architectures which support memory encryption override this.
|
||||
*/
|
||||
ssize_t __weak
|
||||
copy_oldmem_page_encrypted(unsigned long pfn, char *buf, size_t csize,
|
||||
unsigned long offset, int userbuf)
|
||||
ssize_t __weak copy_oldmem_page_encrypted(struct iov_iter *iter,
|
||||
unsigned long pfn, size_t csize, unsigned long offset)
|
||||
{
|
||||
return copy_oldmem_page(pfn, buf, csize, offset, userbuf);
|
||||
return copy_oldmem_page(iter, pfn, csize, offset);
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -24,11 +24,10 @@ extern int remap_oldmem_pfn_range(struct vm_area_struct *vma,
|
||||
unsigned long from, unsigned long pfn,
|
||||
unsigned long size, pgprot_t prot);
|
||||
|
||||
extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
|
||||
unsigned long, int);
|
||||
extern ssize_t copy_oldmem_page_encrypted(unsigned long pfn, char *buf,
|
||||
size_t csize, unsigned long offset,
|
||||
int userbuf);
|
||||
ssize_t copy_oldmem_page(struct iov_iter *i, unsigned long pfn, size_t csize,
|
||||
unsigned long offset);
|
||||
ssize_t copy_oldmem_page_encrypted(struct iov_iter *iter, unsigned long pfn,
|
||||
size_t csize, unsigned long offset);
|
||||
|
||||
void vmcore_cleanup(void);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user