tmp_suning_uos_patched/include
Nadav Har'El d6185f20a0 KVM: nVMX: Add KVM_REQ_IMMEDIATE_EXIT
This patch adds a new vcpu->requests bit, KVM_REQ_IMMEDIATE_EXIT.
This bit requests that when next entering the guest, we should run it only
for as little as possible, and exit again.

We use this new option in nested VMX: When L1 launches L2, but L0 wishes L1
to continue running so it can inject an event to it, we unfortunately cannot
just pretend to have run L2 for a little while - We must really launch L2,
otherwise certain one-off vmcs12 parameters (namely, L1 injection into L2)
will be lost. So the existing code runs L2 in this case.
But L2 could potentially run for a long time until it exits, and the
injection into L1 will be delayed. The new KVM_REQ_IMMEDIATE_EXIT allows us
to request that L2 will be entered, as necessary, but will exit as soon as
possible after entry.

Our implementation of this request uses smp_send_reschedule() to send a
self-IPI, with interrupts disabled. The interrupts remain disabled until the
guest is entered, and then, after the entry is complete (often including
processing an injection and jumping to the relevant handler), the physical
interrupt is noticed and causes an exit.

On recent Intel processors, we could have achieved the same goal by using
MTF instead of a self-IPI. Another technique worth considering in the future
is to use VM_EXIT_ACK_INTR_ON_EXIT and a highest-priority vector IPI - to
slightly improve performance by avoiding the useless interrupt handler
which ends up being called when smp_send_reschedule() is used.

Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-27 11:16:43 +02:00
..
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2011-11-07 10:13:52 -08:00
asm-generic asm-generic/unistd.h: support new process_vm_{readv,write} syscalls 2011-12-03 15:31:48 -05:00
crypto
drm drm/radeon/kms: add some new pci ids 2011-12-14 12:29:03 +00:00
keys
linux KVM: nVMX: Add KVM_REQ_IMMEDIATE_EXIT 2011-12-27 11:16:43 +02:00
math-emu
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2011-12-20 10:49:39 -08:00
misc
mtd
net net: relax rcvbuf limits 2011-12-23 02:15:14 -05:00
pcmcia
rdma Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2011-11-01 10:51:38 -07:00
rxrpc
scsi [SCSI] fcoe: fix fcoe in a DCB environment by adding DCB notifiers to set skb priority 2011-12-15 11:02:07 +04:00
sound Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
target target: remove the unused se_dev_list 2011-12-06 06:00:57 +00:00
trace writeback: show writeback reason with __print_symbolic 2011-12-18 14:20:17 +08:00
video ARM: OMAP: HWMOD: Unify DSS resets for OMAPs 2011-11-08 03:16:13 -07:00
xen Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel" 2011-12-19 09:30:35 -05:00
Kbuild