diff options
| author | Alexander Graf | 2012-01-16 19:12:11 +0100 |
|---|---|---|
| committer | Avi Kivity | 2012-03-05 13:57:28 +0100 |
| commit | d2a1b483a4a3f4bbb5fec1877f716c15ac7fa405 (patch) | |
| tree | 3c1e6162250afb6c79f846749d91d71d2ccc0712 /arch/powerpc/kvm/book3s_64_mmu_hv.c | |
| parent | KVM: PPC: Initialize linears with zeros (diff) | |
| download | kernel-qcow2-linux-d2a1b483a4a3f4bbb5fec1877f716c15ac7fa405.tar.gz kernel-qcow2-linux-d2a1b483a4a3f4bbb5fec1877f716c15ac7fa405.tar.xz kernel-qcow2-linux-d2a1b483a4a3f4bbb5fec1877f716c15ac7fa405.zip | |
KVM: PPC: Add HPT preallocator
We're currently allocating 16MB of linear memory on demand when creating
a guest. That does work some times, but finding 16MB of linear memory
available in the system at runtime is definitely not a given.
So let's add another command line option similar to the RMA preallocator,
that we can use to keep a pool of page tables around. Now, when a guest
gets created it has a pretty low chance of receiving an OOM.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_hv.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 783cd3510c93..ddc485a529f2 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -44,10 +44,20 @@ long kvmppc_alloc_hpt(struct kvm *kvm) unsigned long hpt; unsigned long lpid; struct revmap_entry *rev; + struct kvmppc_linear_info *li; /* Allocate guest's hashed page table */ - hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN, - HPT_ORDER - PAGE_SHIFT); + li = kvm_alloc_hpt(); + if (li) { + /* using preallocated memory */ + hpt = (ulong)li->base_virt; + kvm->arch.hpt_li = li; + } else { + /* using dynamic memory */ + hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT| + __GFP_NOWARN, HPT_ORDER - PAGE_SHIFT); + } + if (!hpt) { pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n"); return -ENOMEM; @@ -88,7 +98,10 @@ void kvmppc_free_hpt(struct kvm *kvm) { clear_bit(kvm->arch.lpid, lpid_inuse); vfree(kvm->arch.revmap); - free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); + if (kvm->arch.hpt_li) + kvm_release_hpt(kvm->arch.hpt_li); + else + free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); } /* Bits in first HPTE dword for pagesize 4k, 64k or 16M */ |