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| author | Alexey Kardashevskiy | 2019-03-29 06:43:26 +0100 |
|---|---|---|
| committer | Paul Mackerras | 2019-04-30 06:43:13 +0200 |
| commit | e1a1ef84cd07f72ce12f139eb9a37d3f9028e7a7 (patch) | |
| tree | 0a22fce388d2adee4edb79f60c9ba694756c80d5 /arch/powerpc/include | |
| parent | KVM: PPC: Book3S HV: Avoid lockdep debugging in TCE realmode handlers (diff) | |
| download | kernel-qcow2-linux-e1a1ef84cd07f72ce12f139eb9a37d3f9028e7a7.tar.gz kernel-qcow2-linux-e1a1ef84cd07f72ce12f139eb9a37d3f9028e7a7.tar.xz kernel-qcow2-linux-e1a1ef84cd07f72ce12f139eb9a37d3f9028e7a7.zip | |
KVM: PPC: Book3S: Allocate guest TCEs on demand too
We already allocate hardware TCE tables in multiple levels and skip
intermediate levels when we can, now it is a turn of the KVM TCE tables.
Thankfully these are allocated already in 2 levels.
This moves the table's last level allocation from the creating helper to
kvmppc_tce_put() and kvm_spapr_tce_fault(). Since such allocation cannot
be done in real mode, this creates a virtual mode version of
kvmppc_tce_put() which handles allocations.
This adds kvmppc_rm_ioba_validate() to do an additional test if
the consequent kvmppc_tce_put() needs a page which has not been allocated;
if this is the case, we bail out to virtual mode handlers.
The allocations are protected by a new mutex as kvm->lock is not suitable
for the task because the fault handler is called with the mmap_sem held
but kvmhv_setup_mmu() locks kvm->lock and mmap_sem in the reverse order.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/kvm_ppc.h | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index e6b5bb012ccb..07cefa53222e 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -201,6 +201,8 @@ struct kvmppc_spapr_tce_iommu_table { struct kref kref; }; +#define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64)) + struct kvmppc_spapr_tce_table { struct list_head list; struct kvm *kvm; @@ -210,6 +212,7 @@ struct kvmppc_spapr_tce_table { u64 offset; /* in pages */ u64 size; /* window size in pages */ struct list_head iommu_tables; + struct mutex alloc_lock; struct page *pages[0]; }; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 02732eb156ae..05128e917a83 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -197,8 +197,6 @@ extern struct kvmppc_spapr_tce_table *kvmppc_find_table( (iommu_tce_check_ioba((stt)->page_shift, (stt)->offset, \ (stt)->size, (ioba), (npages)) ? \ H_PARAMETER : H_SUCCESS) -extern void kvmppc_tce_put(struct kvmppc_spapr_tce_table *tt, - unsigned long idx, unsigned long tce); extern long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, unsigned long ioba, unsigned long tce); extern long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu, |