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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-02 18:39:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-02 18:39:22 -0800
commit6aa293d8ff0939802a6c86cee6cd152c1b0a7a0d (patch)
treef07bcfb2e44bd8bc0a38c4b0fcc707b6ef1a7ab4 /arch
parent04a17edeca524b71dbb5be41a7002d247fbf34c0 (diff)
parent940b241d9050fc354f68c182e99fc3da1ff36bc0 (diff)
downloadlinux-6aa293d8ff0939802a6c86cee6cd152c1b0a7a0d.tar.gz
Merge branch 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Pull UML updates from Richard Weinberger: - DISCARD support for our block device driver - Many TLB flush optimizations - Various smaller fixes - And most important, Anton agreed to help me maintaining UML * 'for-linus-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Remove obsolete reenable_XX calls um: writev needs <sys/uio.h> Add Anton Ivanov to UML maintainers um: remove redundant generic-y um: Optimize Flush TLB for force/fork case um: Avoid marking pages with "changed protection" um: Skip TLB flushing where not needed um: Optimize TLB operations v2 um: Remove unnecessary faulted check in uaccess.c um: Add support for DISCARD in the UBD Driver um: Remove unsafe printks from the io thread um: Clean-up command processing in UML UBD driver um: Switch to block-mq constants in the UML UBD driver um: Make GCOV depend on !KCOV um: Include sys/uio.h to have writev() um: Add HAVE_DEBUG_BUGVERBOSE um: Update maintainers file entry
Diffstat (limited to 'arch')
-rw-r--r--arch/um/Kconfig1
-rw-r--r--arch/um/Kconfig.debug1
-rw-r--r--arch/um/drivers/chan_kern.c10
-rw-r--r--arch/um/drivers/line.c10
-rw-r--r--arch/um/drivers/mconsole_kern.c2
-rw-r--r--arch/um/drivers/net_kern.c2
-rw-r--r--arch/um/drivers/port_kern.c1
-rw-r--r--arch/um/drivers/random.c1
-rw-r--r--arch/um/drivers/ubd_kern.c231
-rw-r--r--arch/um/drivers/vector_user.c2
-rw-r--r--arch/um/include/asm/Kbuild2
-rw-r--r--arch/um/include/asm/pgtable.h9
-rw-r--r--arch/um/include/shared/irq_user.h1
-rw-r--r--arch/um/include/shared/os.h1
-rw-r--r--arch/um/kernel/irq.c6
-rw-r--r--arch/um/kernel/sigio.c1
-rw-r--r--arch/um/kernel/skas/uaccess.c23
-rw-r--r--arch/um/kernel/tlb.c115
-rw-r--r--arch/um/os-Linux/file.c10
19 files changed, 257 insertions, 172 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index a238547671d6..ec9711d068b7 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -12,6 +12,7 @@ config UML
select HAVE_UID16
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_DEBUG_KMEMLEAK
+ select HAVE_DEBUG_BUGVERBOSE
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select GENERIC_CLOCKEVENTS
diff --git a/arch/um/Kconfig.debug b/arch/um/Kconfig.debug
index 2014597605ea..85726eeec345 100644
--- a/arch/um/Kconfig.debug
+++ b/arch/um/Kconfig.debug
@@ -16,6 +16,7 @@ config GPROF
config GCOV
bool "Enable gcov support"
depends on DEBUG_INFO
+ depends on !KCOV
help
This option allows developers to retrieve coverage data from a UML
session.
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 05588f9466c7..a4e64edb8f38 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -211,12 +211,6 @@ void deactivate_chan(struct chan *chan, int irq)
deactivate_fd(chan->fd, irq);
}
-void reactivate_chan(struct chan *chan, int irq)
-{
- if (chan && chan->enabled)
- reactivate_fd(chan->fd, irq);
-}
-
int write_chan(struct chan *chan, const char *buf, int len,
int write_irq)
{
@@ -228,8 +222,6 @@ int write_chan(struct chan *chan, const char *buf, int len,
n = chan->ops->write(chan->fd, buf, len, chan->data);
if (chan->primary) {
ret = n;
- if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
- reactivate_fd(chan->fd, write_irq);
}
return ret;
}
@@ -527,8 +519,6 @@ void chan_interrupt(struct line *line, int irq)
tty_insert_flip_char(port, c, TTY_NORMAL);
} while (err > 0);
- if (err == 0)
- reactivate_fd(chan->fd, irq);
if (err == -EIO) {
if (chan->primary) {
tty_port_tty_hangup(&line->port, false);
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 7e524efed584..e0e63931fb2b 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -235,14 +235,6 @@ void line_unthrottle(struct tty_struct *tty)
line->throttled = 0;
chan_interrupt(line, line->driver->read_irq);
-
- /*
- * Maybe there is enough stuff pending that calling the interrupt
- * throttles us again. In this case, line->throttled will be 1
- * again and we shouldn't turn the interrupt back on.
- */
- if (!line->throttled)
- reactivate_chan(line->chan_in, line->driver->read_irq);
}
static irqreturn_t line_write_interrupt(int irq, void *data)
@@ -667,8 +659,6 @@ static irqreturn_t winch_interrupt(int irq, void *data)
tty_kref_put(tty);
}
out:
- if (winch->fd != -1)
- reactivate_fd(winch->fd, WINCH_IRQ);
return IRQ_HANDLED;
}
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index d5f9a2d1da1b..ff3ab72fd90f 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -96,7 +96,6 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
}
if (!list_empty(&mc_requests))
schedule_work(&mconsole_work);
- reactivate_fd(fd, MCONSOLE_IRQ);
return IRQ_HANDLED;
}
@@ -240,7 +239,6 @@ void mconsole_stop(struct mc_request *req)
(*req->cmd->handler)(req);
}
os_set_fd_block(req->originating_fd, 0);
- reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
mconsole_reply(req, "", 0, 0);
}
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 624cb47cc9cd..d80cfb1d9430 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -137,8 +137,6 @@ static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
schedule_work(&lp->work);
goto out;
}
- reactivate_fd(lp->fd, UM_ETH_IRQ);
-
out:
spin_unlock(&lp->lock);
return IRQ_HANDLED;
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
index 40ca5cc275e9..b0e9ff35daee 100644
--- a/arch/um/drivers/port_kern.c
+++ b/arch/um/drivers/port_kern.c
@@ -137,7 +137,6 @@ static void port_work_proc(struct work_struct *unused)
if (!port->has_connection)
continue;
- reactivate_fd(port->fd, ACCEPT_IRQ);
while (port_accept(port))
;
port->has_connection = 0;
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 778a0e52d5a5..1d5d3057e6f1 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -73,7 +73,6 @@ static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
return ret ? : -EAGAIN;
atomic_inc(&host_sleep_count);
- reactivate_fd(random_fd, RANDOM_IRQ);
add_sigio_fd(random_fd);
add_wait_queue(&host_read_wait, &wait);
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 28c40624bcb6..a4a41421c5e2 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1,4 +1,5 @@
/*
+ * Copyright (C) 2018 Cambridge Greys Ltd
* Copyright (C) 2015-2016 Anton Ivanov (aivanov@brocade.com)
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
@@ -43,11 +44,11 @@
#include <os.h>
#include "cow.h"
-enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH };
+/* Max request size is determined by sector mask - 32K */
+#define UBD_MAX_REQUEST (8 * sizeof(long))
struct io_thread_req {
struct request *req;
- enum ubd_req op;
int fds[2];
unsigned long offsets[2];
unsigned long long offset;
@@ -153,6 +154,7 @@ struct ubd {
struct openflags openflags;
unsigned shared:1;
unsigned no_cow:1;
+ unsigned no_trim:1;
struct cow cow;
struct platform_device pdev;
struct request_queue *queue;
@@ -176,6 +178,7 @@ struct ubd {
.boot_openflags = OPEN_FLAGS, \
.openflags = OPEN_FLAGS, \
.no_cow = 0, \
+ .no_trim = 0, \
.shared = 0, \
.cow = DEFAULT_COW, \
.lock = __SPIN_LOCK_UNLOCKED(ubd_devs.lock), \
@@ -322,7 +325,7 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
*index_out = n;
err = -EINVAL;
- for (i = 0; i < sizeof("rscd="); i++) {
+ for (i = 0; i < sizeof("rscdt="); i++) {
switch (*str) {
case 'r':
flags.w = 0;
@@ -336,12 +339,15 @@ static int ubd_setup_common(char *str, int *index_out, char **error_out)
case 'c':
ubd_dev->shared = 1;
break;
+ case 't':
+ ubd_dev->no_trim = 1;
+ break;
case '=':
str++;
goto break_loop;
default:
*error_out = "Expected '=' or flag letter "
- "(r, s, c, or d)";
+ "(r, s, c, t or d)";
goto out;
}
str++;
@@ -414,6 +420,7 @@ __uml_help(ubd_setup,
" 'c' will cause the device to be treated as being shared between multiple\n"
" UMLs and file locking will be turned off - this is appropriate for a\n"
" cluster filesystem and inappropriate at almost all other times.\n\n"
+" 't' will disable trim/discard support on the device (enabled by default).\n\n"
);
static int udb_setup(char *str)
@@ -511,16 +518,21 @@ static void ubd_handler(void)
}
for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {
struct io_thread_req *io_req = (*irq_req_buffer)[count];
- int err = io_req->error ? BLK_STS_IOERR : BLK_STS_OK;
-
- if (!blk_update_request(io_req->req, err, io_req->length))
- __blk_mq_end_request(io_req->req, err);
+ if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
+ blk_queue_max_discard_sectors(io_req->req->q, 0);
+ blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
+ blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
+ }
+ if ((io_req->error) || (io_req->buffer == NULL))
+ blk_mq_end_request(io_req->req, io_req->error);
+ else {
+ if (!blk_update_request(io_req->req, io_req->error, io_req->length))
+ __blk_mq_end_request(io_req->req, io_req->error);
+ }
kfree(io_req);
}
}
-
- reactivate_fd(thread_fd, UBD_IRQ);
}
static irqreturn_t ubd_intr(int irq, void *dev)
@@ -789,7 +801,7 @@ static int ubd_open_dev(struct ubd *ubd_dev)
if((fd == -ENOENT) && create_cow){
fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,
- ubd_dev->openflags, 1 << 9, PAGE_SIZE,
+ ubd_dev->openflags, SECTOR_SIZE, PAGE_SIZE,
&ubd_dev->cow.bitmap_offset,
&ubd_dev->cow.bitmap_len,
&ubd_dev->cow.data_offset);
@@ -830,6 +842,14 @@ static int ubd_open_dev(struct ubd *ubd_dev)
if(err < 0) goto error;
ubd_dev->cow.fd = err;
}
+ if (ubd_dev->no_trim == 0) {
+ ubd_dev->queue->limits.discard_granularity = SECTOR_SIZE;
+ ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
+ blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
+ blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
+ blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
+ }
+ blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
return 0;
error:
os_close_file(ubd_dev->fd);
@@ -882,7 +902,7 @@ static int ubd_disk_register(int major, u64 size, int unit,
return 0;
}
-#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
+#define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))
static const struct blk_mq_ops ubd_mq_ops = {
.queue_rq = ubd_queue_rq,
@@ -1234,10 +1254,10 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
__u64 bitmap_offset, unsigned long *bitmap_words,
__u64 bitmap_len)
{
- __u64 sector = io_offset >> 9;
+ __u64 sector = io_offset >> SECTOR_SHIFT;
int i, update_bitmap = 0;
- for(i = 0; i < length >> 9; i++){
+ for (i = 0; i < length >> SECTOR_SHIFT; i++) {
if(cow_mask != NULL)
ubd_set_bit(i, (unsigned char *) cow_mask);
if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
@@ -1271,14 +1291,14 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
__u64 bitmap_offset, __u64 bitmap_len)
{
- __u64 sector = req->offset >> 9;
+ __u64 sector = req->offset >> SECTOR_SHIFT;
int i;
- if(req->length > (sizeof(req->sector_mask) * 8) << 9)
+ if (req->length > (sizeof(req->sector_mask) * 8) << SECTOR_SHIFT)
panic("Operation too long");
- if(req->op == UBD_READ) {
- for(i = 0; i < req->length >> 9; i++){
+ if (req_op(req->req) == REQ_OP_READ) {
+ for (i = 0; i < req->length >> SECTOR_SHIFT; i++) {
if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
ubd_set_bit(i, (unsigned char *)
&req->sector_mask);
@@ -1307,68 +1327,86 @@ static int ubd_queue_one_vec(struct blk_mq_hw_ctx *hctx, struct request *req,
io_req->fds[0] = dev->fd;
io_req->error = 0;
- if (req_op(req) == REQ_OP_FLUSH) {
- io_req->op = UBD_FLUSH;
- } else {
- io_req->fds[1] = dev->fd;
- io_req->cow_offset = -1;
- io_req->offset = off;
- io_req->length = bvec->bv_len;
- io_req->sector_mask = 0;
- io_req->op = rq_data_dir(req) == READ ? UBD_READ : UBD_WRITE;
- io_req->offsets[0] = 0;
- io_req->offsets[1] = dev->cow.data_offset;
+ if (bvec != NULL) {
io_req->buffer = page_address(bvec->bv_page) + bvec->bv_offset;
- io_req->sectorsize = 1 << 9;
-
- if (dev->cow.file) {
- cowify_req(io_req, dev->cow.bitmap,
- dev->cow.bitmap_offset, dev->cow.bitmap_len);
- }
+ io_req->length = bvec->bv_len;
+ } else {
+ io_req->buffer = NULL;
+ io_req->length = blk_rq_bytes(req);
}
+ io_req->sectorsize = SECTOR_SIZE;
+ io_req->fds[1] = dev->fd;
+ io_req->cow_offset = -1;
+ io_req->offset = off;
+ io_req->sector_mask = 0;
+ io_req->offsets[0] = 0;
+ io_req->offsets[1] = dev->cow.data_offset;
+
+ if (dev->cow.file)
+ cowify_req(io_req, dev->cow.bitmap,
+ dev->cow.bitmap_offset, dev->cow.bitmap_len);
+
ret = os_write_file(thread_fd, &io_req, sizeof(io_req));
if (ret != sizeof(io_req)) {
if (ret != -EAGAIN)
pr_err("write to io thread failed: %d\n", -ret);
kfree(io_req);
}
-
return ret;
}
+static int queue_rw_req(struct blk_mq_hw_ctx *hctx, struct request *req)
+{
+ struct req_iterator iter;
+ struct bio_vec bvec;
+ int ret;
+ u64 off = (u64)blk_rq_pos(req) << SECTOR_SHIFT;
+
+ rq_for_each_segment(bvec, req, iter) {
+ ret = ubd_queue_one_vec(hctx, req, off, &bvec);
+ if (ret < 0)
+ return ret;
+ off += bvec.bv_len;
+ }
+ return 0;
+}
+
static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct ubd *ubd_dev = hctx->queue->queuedata;
struct request *req = bd->rq;
- int ret = 0;
+ int ret = 0, res = BLK_STS_OK;
blk_mq_start_request(req);
spin_lock_irq(&ubd_dev->lock);
- if (req_op(req) == REQ_OP_FLUSH) {
+ switch (req_op(req)) {
+ /* operations with no lentgth/offset arguments */
+ case REQ_OP_FLUSH:
ret = ubd_queue_one_vec(hctx, req, 0, NULL);
- } else {
- struct req_iterator iter;
- struct bio_vec bvec;
- u64 off = (u64)blk_rq_pos(req) << 9;
-
- rq_for_each_segment(bvec, req, iter) {
- ret = ubd_queue_one_vec(hctx, req, off, &bvec);
- if (ret < 0)
- goto out;
- off += bvec.bv_len;
- }
+ break;
+ case REQ_OP_READ:
+ case REQ_OP_WRITE:
+ ret = queue_rw_req(hctx, req);
+ break;
+ case REQ_OP_DISCARD:
+ case REQ_OP_WRITE_ZEROES:
+ ret = ubd_queue_one_vec(hctx, req, (u64)blk_rq_pos(req) << 9, NULL);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ res = BLK_STS_NOTSUPP;
}
-out:
+
spin_unlock_irq(&ubd_dev->lock);
if (ret < 0)
blk_mq_requeue_request(req, true);
- return BLK_STS_OK;
+ return res;
}
static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
@@ -1413,39 +1451,60 @@ static int ubd_ioctl(struct block_device *bdev, fmode_t mode,
return -EINVAL;
}
+static int map_error(int error_code)
+{
+ switch (error_code) {
+ case 0:
+ return BLK_STS_OK;
+ case ENOSYS:
+ case EOPNOTSUPP:
+ return BLK_STS_NOTSUPP;
+ case ENOSPC:
+ return BLK_STS_NOSPC;
+ }
+ return BLK_STS_IOERR;
+}
+
+/*
+ * Everything from here onwards *IS NOT PART OF THE KERNEL*
+ *
+ * The following functions are part of UML hypervisor code.
+ * All functions from here onwards are executed as a helper
+ * thread and are not allowed to execute any kernel functions.
+ *
+ * Any communication must occur strictly via shared memory and IPC.
+ *
+ * Do not add printks, locks, kernel memory operations, etc - it
+ * will result in unpredictable behaviour and/or crashes.
+ */
+
static int update_bitmap(struct io_thread_req *req)
{
int n;
if(req->cow_offset == -1)
- return 0;
+ return map_error(0);
n = os_pwrite_file(req->fds[1], &req->bitmap_words,
sizeof(req->bitmap_words), req->cow_offset);
- if(n != sizeof(req->bitmap_words)){
- printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
- req->fds[1]);
- return 1;
- }
+ if (n != sizeof(req->bitmap_words))
+ return map_error(-n);
- return 0;
+ return map_error(0);
}
static void do_io(struct io_thread_req *req)
{
- char *buf;
+ char *buf = NULL;
unsigned long len;
int n, nsectors, start, end, bit;
__u64 off;
- if (req->op == UBD_FLUSH) {
+ /* FLUSH is really a special case, we cannot "case" it with others */
+
+ if (req_op(req->req) == REQ_OP_FLUSH) {
/* fds[0] is always either the rw image or our cow file */
- n = os_sync_file(req->fds[0]);
- if (n != 0) {
- printk("do_io - sync failed err = %d "
- "fd = %d\n", -n, req->fds[0]);
- req->error = 1;
- }
+ req->error = map_error(-os_sync_file(req->fds[0]));
return;
}
@@ -1462,30 +1521,42 @@ static void do_io(struct io_thread_req *req)
off = req->offset + req->offsets[bit] +
start * req->sectorsize;
len = (end - start) * req->sectorsize;
- buf = &req->buffer[start * req->sectorsize];
+ if (req->buffer != NULL)
+ buf = &req->buffer[start * req->sectorsize];
- if(req->op == UBD_READ){
+ switch (req_op(req->req)) {
+ case REQ_OP_READ:
n = 0;
do {
buf = &buf[n];
len -= n;
n = os_pread_file(req->fds[bit], buf, len, off);
if (n < 0) {
- printk("do_io - read failed, err = %d "
- "fd = %d\n", -n, req->fds[bit]);
- req->error = 1;
+ req->error = map_error(-n);
return;
}
} while((n < len) && (n != 0));
if (n < len) memset(&buf[n], 0, len - n);
- } else {
+ break;
+ case REQ_OP_WRITE:
n = os_pwrite_file(req->fds[bit], buf, len, off);
if(n != len){
- printk("do_io - write failed err = %d "
- "fd = %d\n", -n, req->fds[bit]);
- req->error = 1;
+ req->error = map_error(-n);
+ return;
+ }
+ break;
+ case REQ_OP_DISCARD:
+ case REQ_OP_WRITE_ZEROES:
+ n = os_falloc_punch(req->fds[bit], off, len);
+ if (n) {
+ req->error = map_error(-n);
return;
}
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ req->error = BLK_STS_NOTSUPP;
+ return;
}
start = end;
@@ -1520,11 +1591,6 @@ int io_thread(void *arg)
if (n == -EAGAIN) {
ubd_read_poll(-1);
continue;
- } else {
- printk("io_thread - read failed, fd = %d, "
- "err = %d,"
- "reminder = %d\n",
- kernel_fd, -n, io_remainder_size);
}
}
@@ -1539,11 +1605,6 @@ int io_thread(void *arg)
res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n);
if (res >= 0) {
written += res;
- } else {
- if (res != -EAGAIN) {
- printk("io_thread - write failed, fd = %d, "
- "err = %d\n", kernel_fd, -n);
- }
}
if (written < n) {
ubd_write_poll(-1);
diff --git a/arch/um/drivers/vector_user.c b/arch/um/drivers/vector_user.c
index 3d8cdbdb4e66..d2c17dd74620 100644
--- a/arch/um/drivers/vector_user.c
+++ b/arch/um/drivers/vector_user.c
@@ -25,11 +25,13 @@
#include <linux/if_packet.h>
#include <sys/socket.h>
#include <sys/wait.h>
+#include <sys/uio.h>
#include <linux/virtio_net.h>
#include <netdb.h>
#include <stdlib.h>
#include <os.h>
#include <um_malloc.h>
+#include <sys/uio.h>
#include "vector_user.h"
#define ID_GRE 0
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index b10dde6cb793..00bcbe2326d9 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -10,9 +10,7 @@ generic-y += exec.h
generic-y += extable.h
generic-y += ftrace.h
generic-y += futex.h
-generic-y += hardirq.h
generic-y += hw_irq.h
-generic-y += io.h
generic-y += irq_regs.h
generic-y += irq_work.h
generic-y += kdebug.h
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 7485398d0737..9c04562310b3 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -197,12 +197,17 @@ static inline pte_t pte_mkold(pte_t pte)
static inline pte_t pte_wrprotect(pte_t pte)
{
- pte_clear_bits(pte, _PAGE_RW);
+ if (likely(pte_get_bits(pte, _PAGE_RW)))
+ pte_clear_bits(pte, _PAGE_RW);
+ else
+ return pte;
return(pte_mknewprot(pte));
}
static inline pte_t pte_mkread(pte_t pte)
{
+ if (unlikely(pte_get_bits(pte, _PAGE_USER)))
+ return pte;
pte_set_bits(pte, _PAGE_USER);
return(pte_mknewprot(pte));
}
@@ -221,6 +226,8 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkwrite(pte_t pte)
{
+ if (unlikely(pte_get_bits(pte, _PAGE_RW)))
+ return pte;
pte_set_bits(pte, _PAGE_RW);
return(pte_mknewprot(pte));
}
diff --git a/arch/um/include/shared/irq_user.h b/arch/um/include/shared/irq_user.h
index a7a6120f19d5..e7242a0ae489 100644
--- a/arch/um/include/shared/irq_user.h
+++ b/arch/um/include/shared/irq_user.h
@@ -31,7 +31,6 @@ struct irq_fd {
struct siginfo;
extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
extern void free_irq_by_fd(int fd);
-extern void reactivate_fd(int fd, int irqnum);
extern void deactivate_fd(int fd, int irqnum);
extern int deactivate_all_fds(void);
extern int activate_ipi(int fd, int pid);
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 048ae37eb5aa..ebf23012a59b 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -175,6 +175,7 @@ extern int os_fchange_dir(int fd);
extern unsigned os_major(unsigned long long dev);
extern unsigned os_minor(unsigned long long dev);
extern unsigned long long os_makedev(unsigned major, unsigned minor);
+extern int os_falloc_punch(int fd, unsigned long long offset, int count);
/* start_up.c */
extern void os_early_checks(void);
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 8360fa3f676d..f4874b7ec503 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -350,11 +350,6 @@ static void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
}
-void reactivate_fd(int fd, int irqnum)
-{
- /** NOP - we do auto-EOI now **/
-}
-
void deactivate_fd(int fd, int irqnum)
{
struct irq_entry *to_free;
@@ -449,7 +444,6 @@ int um_request_irq(unsigned int irq, int fd, int type,
}
EXPORT_SYMBOL(um_request_irq);
-EXPORT_SYMBOL(reactivate_fd);
/*
* irq_chip must define at least enable/disable and ack when
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
index b5e0cbb34382..3fb6a4041ed6 100644
--- a/arch/um/kernel/sigio.c
+++ b/arch/um/kernel/sigio.c
@@ -16,7 +16,6 @@ static irqreturn_t sigio_interrupt(int irq, void *data)
char c;
os_read_file(sigio_irq_fd, &c, sizeof(c));
- reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
return IRQ_HANDLED;
}
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index d450797a3a7c..7f06fdbc7ee1 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -62,27 +62,28 @@ static int do_op_one_page(unsigned long addr, int len, int is_write,
jmp_buf buf;
struct page *page;
pte_t *pte;
- int n, faulted;
+ int n;
pte = maybe_map(addr, is_write);
if (pte == NULL)
return -1;
page = pte_page(*pte);
+#ifdef CONFIG_64BIT
+ pagefault_disable();
+ addr = (unsigned long) page_address(page) +
+ (addr & ~PAGE_MASK);
+#else
addr = (unsigned long) kmap_atomic(page) +
(addr & ~PAGE_MASK);
+#endif
+ n = (*op)(addr, len, arg);
- current->thread.fault_catcher = &buf;
-
- faulted = UML_SETJMP(&buf);
- if (faulted == 0)
- n = (*op)(addr, len, arg);
- else
- n = -1;
-
- current->thread.fault_catcher = NULL;
-
+#ifdef CONFIG_64BIT
+ pagefault_enable();
+#else
kunmap_atomic((void *)addr);
+#endif
return n;
}
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 37508b190106..8347161c2ae0 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -37,17 +37,19 @@ struct host_vm_change {
} mprotect;
} u;
} ops[1];
+ int userspace;
int index;
- struct mm_id *id;
+ struct mm_struct *mm;
void *data;
int force;
};
-#define INIT_HVC(mm, force) \
+#define INIT_HVC(mm, force, userspace) \
((struct host_vm_change) \
{ .ops = { { .type = NONE } }, \
- .id = &mm->context.id, \
+ .mm = mm, \
.data = NULL, \
+ .userspace = userspace, \
.index = 0, \
.force = force })
@@ -68,18 +70,40 @@ static int do_ops(struct host_vm_change *hvc, int end,
op = &hvc->ops[i];
switch (op->type) {
case MMAP:
- ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
- op->u.mmap.prot, op->u.mmap.fd,
- op->u.mmap.offset, finished, &hvc->data);
+ if (hvc->userspace)
+ ret = map(&hvc->mm->context.id, op->u.mmap.addr,
+ op->u.mmap.len, op->u.mmap.prot,
+ op->u.mmap.fd,
+ op->u.mmap.offset, finished,
+ &hvc->data);
+ else
+ map_memory(op->u.mmap.addr, op->u.mmap.offset,
+ op->u.mmap.len, 1, 1, 1);
break;
case MUNMAP:
- ret = unmap(hvc->id, op->u.munmap.addr,
- op->u.munmap.len, finished, &hvc->data);
+ if (hvc->userspace)
+ ret = unmap(&hvc->mm->context.id,
+ op->u.munmap.addr,
+ op->u.munmap.len, finished,
+ &hvc->data);
+ else
+ ret = os_unmap_memory(
+ (void *) op->u.munmap.addr,
+ op->u.munmap.len);
+
break;
case MPROTECT:
- ret = protect(hvc->id, op->u.mprotect.addr,
- op->u.mprotect.len, op->u.mprotect.prot,
- finished, &hvc->data);
+ if (hvc->userspace)
+ ret = protect(&hvc->mm->context.id,
+ op->u.mprotect.addr,
+ op->u.mprotect.len,
+ op->u.mprotect.prot,
+ finished, &hvc->data);
+ else
+ ret = os_protect_memory(
+ (void *) op->u.mprotect.addr,
+ op->u.mprotect.len,
+ 1, 1, 1);
break;
default:
printk(KERN_ERR "Unknown op type %d in do_ops\n",
@@ -100,9 +124,12 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
{
__u64 offset;
struct host_vm_op *last;
- int fd, ret = 0;
+ int fd = -1, ret = 0;
- fd = phys_mapping(phys, &offset);
+ if (hvc->userspace)
+ fd = phys_mapping(phys, &offset);
+ else
+ offset = phys;
if (hvc->index != 0) {
last = &hvc->ops[hvc->index - 1];
if ((last->type == MMAP) &&
@@ -215,10 +242,11 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0));
if (hvc->force || pte_newpage(*pte)) {
- if (pte_present(*pte))
- ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
- PAGE_SIZE, prot, hvc);
- else
+ if (pte_present(*pte)) {
+ if (pte_newpage(*pte))
+ ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
+ PAGE_SIZE, prot, hvc);
+ } else
ret = add_munmap(addr, PAGE_SIZE, hvc);
} else if (pte_newprot(*pte))
ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
@@ -277,9 +305,9 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
pgd_t *pgd;
struct host_vm_change hvc;
unsigned long addr = start_addr, next;
- int ret = 0;
+ int ret = 0, userspace = 1;
- hvc = INIT_HVC(mm, force);
+ hvc = INIT_HVC(mm, force, userspace);
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end_addr);
@@ -314,9 +342,11 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
- int updated = 0, err;
+ int updated = 0, err = 0, force = 0, userspace = 0;
+ struct host_vm_change hvc;
mm = &init_mm;
+ hvc = INIT_HVC(mm, force, userspace);
for (addr = start; addr < end;) {
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd)) {
@@ -325,8 +355,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pgd_newpage(*pgd)) {
updated = 1;
- err = os_unmap_memory((void *) addr,
- last - addr);
+ err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@@ -342,8 +371,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pud_newpage(*pud)) {
updated = 1;
- err = os_unmap_memory((void *) addr,
- last - addr);
+ err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@@ -359,8 +387,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
last = end;
if (pmd_newpage(*pmd)) {
updated = 1;
- err = os_unmap_memory((void *) addr,
- last - addr);
+ err = add_munmap(addr, last - addr, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
@@ -372,22 +399,25 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
pte = pte_offset_kernel(pmd, addr);
if (!pte_present(*pte) || pte_newpage(*pte)) {
updated = 1;
- err = os_unmap_memory((void *) addr,
- PAGE_SIZE);
+ err = add_munmap(addr, PAGE_SIZE, &hvc);
if (err < 0)
panic("munmap failed, errno = %d\n",
-err);
if (pte_present(*pte))
- map_memory(addr,
- pte_val(*pte) & PAGE_MASK,
- PAGE_SIZE, 1, 1, 1);
+ err = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
+ PAGE_SIZE, 0, &hvc);
}
else if (pte_newprot(*pte)) {
updated = 1;
- os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
+ err = add_mprotect(addr, PAGE_SIZE, 0, &hvc);
}
addr += PAGE_SIZE;
}
+ if (!err)
+ err = do_ops(&hvc, hvc.index, 1);
+
+ if (err < 0)
+ panic("flush_tlb_kernel failed, errno = %d\n", err);
return updated;
}
@@ -491,6 +521,13 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
void flush_tlb_all(void)
{
+ /*
+ * Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if (atomic_read(&current->mm->mm_users) == 0)
+ return;
+
flush_tlb_mm(current->mm);
}
@@ -512,6 +549,13 @@ void __flush_tlb_one(unsigned long addr)
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
+ /*
+ * Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if (atomic_read(&mm->mm_users) == 0)
+ return;
+
fix_range_common(mm, start_addr, end_addr, force);
}
@@ -527,13 +571,6 @@ EXPORT_SYMBOL(flush_tlb_range);
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
- /*
- * Don't bother flushing if this address space is about to be
- * destroyed.
- */
- if (atomic_read(&mm->mm_users) == 0)
- return;
-
fix_range(mm, start, end, 0);
}
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index c0197097c86e..f25b110d4e70 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -610,3 +610,13 @@ unsigned long long os_makedev(unsigned major, unsigned minor)
{
return makedev(major, minor);
}
+
+int os_falloc_punch(int fd, unsigned long long offset, int len)
+{
+ int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+