diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2016-06-14 16:32:32 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-06-14 16:32:32 +0100 |
| commit | 49237b856ae58ee7955be0b959c504c51b014f20 (patch) | |
| tree | 7b827dc81ed79226b9e4d15f266bcf6de51bdd87 /hw | |
| parent | 1be08a0946b1a189ac72822182c37367e8cd3d87 (diff) | |
| parent | b1b23e5bbfb66d9401e2c2b0646fb721d94a3f83 (diff) | |
Merge remote-tracking branch 'remotes/sstabellini/tags/xen-20160614-tag' into staging
Xen 2016/06/14
# gpg: Signature made Tue 14 Jun 2016 16:01:52 BST
# gpg: using RSA key 0x894F8F4870E1AE90
# gpg: Good signature from "Stefano Stabellini <stefano.stabellini@eu.citrix.com>"
# Primary key fingerprint: D04E 33AB A51F 67BA 07D3 0AEA 894F 8F48 70E1 AE90
* remotes/sstabellini/tags/xen-20160614-tag:
xen: Clean up includes
xen/blkif: avoid double access to any shared ring request fields
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/block/xen_blkif.h | 12 | ||||
| -rw-r--r-- | hw/block/xen_disk.c | 2 | ||||
| -rw-r--r-- | hw/usb/xen-usb.c | 5 |
3 files changed, 9 insertions, 10 deletions
diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h index c68487cb31..e3b133b9f8 100644 --- a/hw/block/xen_blkif.h +++ b/hw/block/xen_blkif.h @@ -79,14 +79,14 @@ static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_reque dst->handle = src->handle; dst->id = src->id; dst->sector_number = src->sector_number; - if (src->operation == BLKIF_OP_DISCARD) { + /* Prevent the compiler from using src->... instead. */ + barrier(); + if (dst->operation == BLKIF_OP_DISCARD) { struct blkif_request_discard *s = (void *)src; struct blkif_request_discard *d = (void *)dst; d->nr_sectors = s->nr_sectors; return; } - /* prevent the compiler from optimizing the code and using src->nr_segments instead */ - barrier(); if (n > dst->nr_segments) n = dst->nr_segments; for (i = 0; i < n; i++) @@ -102,14 +102,14 @@ static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_reque dst->handle = src->handle; dst->id = src->id; dst->sector_number = src->sector_number; - if (src->operation == BLKIF_OP_DISCARD) { + /* Prevent the compiler from using src->... instead. */ + barrier(); + if (dst->operation == BLKIF_OP_DISCARD) { struct blkif_request_discard *s = (void *)src; struct blkif_request_discard *d = (void *)dst; d->nr_sectors = s->nr_sectors; return; } - /* prevent the compiler from optimizing the code and using src->nr_segments instead */ - barrier(); if (n > dst->nr_segments) n = dst->nr_segments; for (i = 0; i < n; i++) diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c index 064c116a7c..cf57814fb6 100644 --- a/hw/block/xen_disk.c +++ b/hw/block/xen_disk.c @@ -679,6 +679,8 @@ static int blk_get_request(struct XenBlkDev *blkdev, struct ioreq *ioreq, RING_I RING_GET_REQUEST(&blkdev->rings.x86_64_part, rc)); break; } + /* Prevent the compiler from accessing the on-ring fields instead. */ + barrier(); return 0; } diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c index 664df04181..8fa47edd9a 100644 --- a/hw/usb/xen-usb.c +++ b/hw/usb/xen-usb.c @@ -19,13 +19,10 @@ * GNU GPL, version 2 or (at your option) any later version. */ +#include "qemu/osdep.h" #include <libusb.h> -#include <stdio.h> -#include <sys/types.h> #include <sys/mman.h> -#include <sys/time.h> -#include "qemu/osdep.h" #include "qemu-common.h" #include "qemu/config-file.h" #include "hw/sysbus.h" |