From 76bcceff0bfbded075c9703ec5413a9bf50ef8c4 Mon Sep 17 00:00:00 2001 From: Mukesh Rathor Date: Fri, 3 Jan 2014 09:48:08 -0500 Subject: [PATCH] xen/pvh/mmu: Use PV TLB instead of native. We also optimize one - the TLB flush. The native operation would needlessly IPI offline VCPUs causing extra wakeups. Using the Xen one avoids that and lets the hypervisor determine which VCPU needs the TLB flush. Signed-off-by: Mukesh Rathor Signed-off-by: Konrad Rzeszutek Wilk --- arch/x86/xen/mmu.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 490ddb354590..c1d406f35523 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -2222,6 +2222,15 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = { void __init xen_init_mmu_ops(void) { x86_init.paging.pagetable_init = xen_pagetable_init; + + /* Optimization - we can use the HVM one but it has no idea which + * VCPUs are descheduled - which means that it will needlessly IPI + * them. Xen knows so let it do the job. + */ + if (xen_feature(XENFEAT_auto_translated_physmap)) { + pv_mmu_ops.flush_tlb_others = xen_flush_tlb_others; + return; + } pv_mmu_ops = xen_mmu_ops; memset(dummy_mapping, 0xff, PAGE_SIZE); -- 2.20.1