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Date: Mon, 24 Nov 2008 15:44:24 -0200 From: Glauber Costa <glommer@...hat.com> To: linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, avi@...hat.com, aliguori@...ibm.com Subject: [PATCH] really remove a slow when a user ask us so Right now, KVM does not remove a slot when we do a register ioctl for size 0 (would be the expected behaviour). Instead, we only mark it as empty, but keep all bitmaps and allocated data structures present. It completely nullifies our chances of reusing that same slot again for mapping a different piece of memory. In this patch, we destroy rmaps, and vfree() the pointers that used to hold the dirty bitmap, rmap and lpage_info structures. Signed-off-by: Glauber Costa <glommer@...hat.com> --- virt/kvm/kvm_main.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b1953ee..f605bba 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -735,11 +735,17 @@ int __kvm_set_memory_region(struct kvm *kvm, base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; npages = mem->memory_size >> PAGE_SHIFT; - if (!npages) - mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; - new = old = *memslot; + if (!npages) { + mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; + kvm_arch_flush_shadow(kvm); + kvm_free_physmem_slot(memslot, NULL); + kvm_arch_set_memory_region(kvm, mem, old, user_alloc); + goto out; + } + + new.base_gfn = base_gfn; new.npages = npages; new.flags = mem->flags; @@ -812,9 +818,6 @@ int __kvm_set_memory_region(struct kvm *kvm, } #endif /* not defined CONFIG_S390 */ - if (!npages) - kvm_arch_flush_shadow(kvm); - spin_lock(&kvm->mmu_lock); if (mem->slot >= kvm->nmemslots) kvm->nmemslots = mem->slot + 1; -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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