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authorAmit Shah <amit.shah@redhat.com>2010-10-20 13:45:43 +1030
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-20 13:18:04 -0700
commit531295e63be8c2b8b909d7400739e8b8df60d61f (patch)
tree1ae5e6429e3fb52104220e543534049a6832ba1a /security
parent30c278192f9ab06125fb042f6e46763e0fd7140a (diff)
virtio: console: Don't block entire guest if host doesn't read data
If the host is slow in reading data or doesn't read data at all, blocking write calls not only blocked the program that called write() but the entire guest itself. To overcome this, let's not block till the host signals it has given back the virtio ring element we passed it. Instead, send the buffer to the host and return to userspace. This operation then becomes similar to how non-blocking writes work, so let's use the existing code for this path as well. This code change also ensures blocking write calls do get blocked if there's not enough room in the virtio ring as well as they don't return -EAGAIN to userspace. Signed-off-by: Amit Shah <amit.shah@redhat.com> Acked-by: Hans de Goede <hdegoede@redhat.com> CC: stable@kernel.org Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions

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