diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 11:03:40 +1000 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 15:49:55 +1000 |
| commit | 0a8a69dd77ddbd4513b21363021ecde7e1025502 (patch) | |
| tree | ed6d8f0756835390b4c0d9a172422f2e42a65523 /arch | |
| parent | b01d9f2863349b0e041b90c3c86a998ee0fed2b0 (diff) | |
Virtio helper routines for a descriptor ringbuffer implementation
These helper routines supply most of the virtqueue_ops for hypervisors
which want to use a ring for virtio. Unlike the previous lguest
implementation:
1) The rings are variable sized (2^n-1 elements).
2) They have an unfortunate limit of 65535 bytes per sg element.
3) The page numbers are always 64 bit (PAE anyone?)
4) They no longer place used[] on a separate page, just a separate
cacheline.
5) We do a modulo on a variable. We could be tricky if we cared.
6) Interrupts and notifies are suppressed using flags within the rings.
Users need only get the ring pages and provide a notify hook (KVM
wants the guest to allocate the rings, lguest does it sanely).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Dor Laor <dor.laor@qumranet.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/lguest/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/lguest/Kconfig b/arch/x86/lguest/Kconfig index 0fabf87db99..44dccfd845f 100644 --- a/arch/x86/lguest/Kconfig +++ b/arch/x86/lguest/Kconfig @@ -2,6 +2,7 @@ config LGUEST_GUEST bool "Lguest guest support" select PARAVIRT depends on !X86_PAE + select VIRTIO_RING help Lguest is a tiny in-kernel hypervisor. Selecting this will allow your kernel to boot under lguest. This option will increase |