aboutsummaryrefslogtreecommitdiffstats
path: root/arch/i386/kernel/paravirt.c
diff options
context:
space:
mode:
authorZachary Amsden <zach@vmware.com>2007-02-13 07:26:21 -0500
committerAndi Kleen <andi@basil.nowhere.org>2007-02-13 07:26:21 -0500
commit9226d125d94c7e4964dd41cc5e9ca2ff84091d01 (patch)
tree935d6e80ff843e1d7b54e0fd9386ef2e0d31aa3d /arch/i386/kernel/paravirt.c
parentc119ecce894120790903ef535dac3e105f3d6cde (diff)
[PATCH] i386: paravirt CPU hypercall batching mode
The VMI ROM has a mode where hypercalls can be queued and batched. This turns out to be a significant win during context switch, but must be done at a specific point before side effects to CPU state are visible to subsequent instructions. This is similar to the MMU batching hooks already provided. The same hooks could be used by the Xen backend to implement a context switch multicall. To explain a bit more about lazy modes in the paravirt patches, basically, the idea is that only one of lazy CPU or MMU mode can be active at any given time. Lazy MMU mode is similar to this lazy CPU mode, and allows for batching of multiple PTE updates (say, inside a remap loop), but to avoid keeping some kind of state machine about when to flush cpu or mmu updates, we just allow one or the other to be active. Although there is no real reason a more comprehensive scheme could not be implemented, there is also no demonstrated need for this extra complexity. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'arch/i386/kernel/paravirt.c')
-rw-r--r--arch/i386/kernel/paravirt.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index 7329ec9fcc99..4dfdac4550dd 100644
--- a/arch/i386/kernel/paravirt.c
+++ b/arch/i386/kernel/paravirt.c
@@ -545,6 +545,7 @@ struct paravirt_ops paravirt_ops = {
545 .apic_write_atomic = native_apic_write_atomic, 545 .apic_write_atomic = native_apic_write_atomic,
546 .apic_read = native_apic_read, 546 .apic_read = native_apic_read,
547#endif 547#endif
548 .set_lazy_mode = (void *)native_nop,
548 549
549 .flush_tlb_user = native_flush_tlb, 550 .flush_tlb_user = native_flush_tlb,
550 .flush_tlb_kernel = native_flush_tlb_global, 551 .flush_tlb_kernel = native_flush_tlb_global,