From c8240bd6f0b4b1b21ffd36dd44114d05c7afe0c0 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Fri, 30 Oct 2009 05:47:26 +0000 Subject: [PATCH] Use Little Endian for Dirty Bitmap We currently use host endian long types to store information in the dirty bitmap. This works reasonably well on Little Endian targets, because the u32 after the first contains the next 32 bits. On Big Endian this breaks completely though, forcing us to be inventive here. So Ben suggested to always use Little Endian, which looks reasonable. We only have dirty bitmap implemented in Little Endian targets so far and since PowerPC would be the first Big Endian platform, we can just as well switch to Little Endian always with little effort without breaking existing targets. Signed-off-by: Alexander Graf Signed-off-by: Benjamin Herrenschmidt --- virt/kvm/kvm_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7495ce34734..cdca63917e7 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -48,6 +48,7 @@ #include #include #include +#include #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET #include "coalesced_mmio.h" @@ -1665,8 +1666,8 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn) unsigned long rel_gfn = gfn - memslot->base_gfn; /* avoid RMW */ - if (!test_bit(rel_gfn, memslot->dirty_bitmap)) - set_bit(rel_gfn, memslot->dirty_bitmap); + if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap)) + generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); } } -- 2.11.4.GIT