search for: 351af88231ad

...ngeli <aarcange at redhat.com> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af88231ad..34a1cedbc5ba 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1711,6 +1711,7 @@ static int set_bit_to_user(int nr, void __user *addr) base = kmap_atomic(page); set_bit(bit, base); kunmap_atomic(base); + flush_dcache_page(page); set_page_dirty_lock(page); put_page(page);...

...ngeli <aarcange at redhat.com> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af88231ad..34a1cedbc5ba 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1711,6 +1711,7 @@ static int set_bit_to_user(int nr, void __user *addr) base = kmap_atomic(page); set_bit(bit, base); kunmap_atomic(base); + flush_dcache_page(page); set_page_dirty_lock(page); put_page(page);...

...er.appspotmail.com Fixes: 6b1e6cc7 ("vhost: new device IOTLB API") Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 5ace833de746..351af88231ad 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -911,8 +911,12 @@ static int vhost_new_umem_range(struct vhost_umem *umem, u64 start, u64 size, u64 end, u64 userspace_addr, int perm) { - struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC); + struct v...

...n the other direction too? How are atomics supposed to work at all? I really think we need new APIs along the lines of set_bit_to_user. > --- > drivers/vhost/vhost.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index 351af88231ad..34a1cedbc5ba 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -1711,6 +1711,7 @@ static int set_bit_to_user(int nr, void __user *addr) > base = kmap_atomic(page); > set_bit(bit, base); > kunmap_atomic(base); > + flush_dcache_page(page); > set_...

This series tries to access virtqueue metadata through kernel virtual address instead of copy_user() friends since they had too much overheads like checks, spec barriers or even hardware feature toggling. This is done through setup kernel address through direct mapping and co-opreate VM management with MMU notifiers. Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see obvious