The logic now mimics native x86 behaviour: a request to change
affinity via /proc is held until the next interrupt on that
event channel. So /proc/irq/n/smp_affinity may not change
immediately!
Other notes:
1. CPU-specific interrupts silently ignore requests to change
affinity. For example, resched0, timer0, callfunc0, ...
2. Reading smp_affinity always returns a cpumask containing
a single cpu. An event channel can only be bound to a single
cpu at a time. Neither Xen nor XenLinux implement IRQ
balancing: requires a user-space balancing daemon.
Signed-off-by: Keir Fraser <keir@xensource.com>
with local_event_delivery_* accessors.
Notes:
1. Still some (read-only, debug) use in keyhandler.c
2. Still accesses through current->vcpu_info.
Both above may need to be compiled only for architectures
that use event channels.
Signed-off-by: Keir Fraser <keir@xensource.com>
called from non-local VCPU. Necessary as Linux always calls
this operation from VCPU0 during secondary-VCPU bringup.
Signed-off-by: Keir Fraser <keir@xensource.com>
xenbus_transaction_t -> struct xenbus_transaction, which just contains
a single u32. Also renamed XBT_NULL to XBT_NIL to emphasize that it
isn't a NULL pointer, but a NIL transaction ID. Compile and boot tested.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
[chrisw: updated for xen-unstable from patchqueue]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
instead, since that's what it is there for. Similar to patch
in patchqueue started by Jeremy, and expanded by me to include all
relevant drivers in xen-unstable.
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
EXPORTs with functions, order includes, eliminate unsed macros, don't
initialize static data to NULL, etc. Cleanups from patchqueue.
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
While there rearrange the ring setup order slightly to simplify error
path since netif_free() will cleanup once ring_ref is valid. And use
get_zeroed_page() instead of __get_free_page()/memset(). Handle error if
bind_evtchn_to_irqhandler() fails, as bad info->irq value is likely to
cause oops later. In create_device(), gnttab_free_grant_references()
is accidentally called twice on tx_head during cleanup from failed
gnttab_alloc_grant_references() on rx_head, which could corrupt
gnttab_free_count.
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
On x86 this corresponds to a maximum aligned contiguous allocation of 8MB.
This can be overridden by architectures if need be.
Signed-off-by: Keir Fraser <keir@xensource.com>
This instruction is used by both WinXP during an SMP installation and by
Sun Solaris. With this patch Sun Solaris UP is able to boot. Windows
SMP gets a bit further but still has issues.
Signed-off-by: Tom Woller <thomas.woller@amd.com>
Signed-off-by: Travis Betak <tbetak.woller@amd.com>
Fabrice Bellard on the QEMU project). This patch clears the
memory in the BIOS call rather than when the Cirrus Logic register changes,
which more closely matches what happens on the real hardware.
Signed-off-by: Don Dugger <donald.d.dugger@intel.com>
Thus all can be disabled at compile time. It would be easy to
make enabling/disabling a run-time option too.
Signed-off-by: Keir Fraser <keir@xensource.com>
Advertising more CPUs than the guest is allocated hangs boot
of Windows XP (selects wrong HAL). The correct fix here is
to dynamically generate the MPS table (at least the CPU
entries) from hvmloader binary.
Signed-off-by: Keir Fraser <keir@xensource.com>
As discussed previously, the these operations are not performance-sensitive, so
the additional cache footprint shouldn't be an issue.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
This patch adds scatter-and-gather transmission support to the frontend.
This allows the MTU to be raised right now and the potential for TSO in
future.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This patch adds scatter-and-gather support to the backend. It also
advertises this fact through xenbus so that the frontend can detect
this and send through SG requests only if it is supported.
SG support is required to support skb's larger than one page. This
in turn is needed for either jumbo MTU or TSO. One of these is
required to bring local networking performance up to a level that
is acceptable.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Extends vmxassist to handle two cases related to mode switching found
while experimenting with different boot loaders.
The first case is use of the JMP instruction with memory location
operands to complete a switch to protected mode. This patch adds
emulation for this form of the JMP instruction to vmxassist.
The second case is where boot loader code does not save/restore a
non-zero SS register across a protected mode traversal.
Zeroing the SS register in vmxassist results in all sorts of problems
in the domU after returning back to real mode. This patch stores
segment register values before entering protected mode and correctly
restores the old values (instead of an incorrect zero value) when
reentering real mode.
Signed-off-by: Kevin Tronkowski <ktronkowski@virtualiron.com>
Must ensure ring is written to before producer index is incremented.
Bug diagnosed by Ky Srinivasan <ksrinivasan@novell.com>
Signed-off-by: Keir Fraser <keir@xensource.com>
pae_pgdir_above_4gb tp guests that have enabled this vmassist.
Control tools ensure all PAE page directories are below 4GB
unless the vmassist is enabled (triggered via an extended-cr3
option in guest Elf header).
Signed-off-by: Keir Fraser <keir@xensource.com>
The temporary mappings needed to set up the 1:1 mappings must be torn
down after use; otherwise they may trigger the
WARN_ON() in vmap_pte_range() (namely if the chunk allocated to hold
kernel and initial page tables gets close to or
exceeds 128Mb, or if a sufficiently high mem= argument causes the
static allocations to grow beyond 128Mb, which in
either case means these mappings extend into the modules area).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
