[PATCH kernel v2 6/6] KVM: PPC: Remove redundand permission bits removal
David Gibson
david at gibson.dropbear.id.au
Tue Sep 11 13:15:45 AEST 2018
On Mon, Sep 10, 2018 at 06:29:12PM +1000, Alexey Kardashevskiy wrote:
> The kvmppc_gpa_to_ua() helper itself takes care of the permission
> bits in the TCE and yet every single caller removes them.
>
> This changes semantics of kvmppc_gpa_to_ua() so it takes TCEs
> (which are GPAs + TCE permission bits) to make the callers simpler.
>
> This should cause no behavioural change.
>
> Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
> ---
> Changes:
> v2:
> * %s/kvmppc_gpa_to_ua/kvmppc_tce_to_ua/g
> ---
> arch/powerpc/include/asm/kvm_ppc.h | 2 +-
> arch/powerpc/kvm/book3s_64_vio.c | 12 ++++--------
> arch/powerpc/kvm/book3s_64_vio_hv.c | 22 +++++++++-------------
> 3 files changed, 14 insertions(+), 22 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
> index 2f5d431..38d0328 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -194,7 +194,7 @@ 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 long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
> +extern long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce,
> unsigned long *ua, unsigned long **prmap);
> extern void kvmppc_tce_put(struct kvmppc_spapr_tce_table *tt,
> unsigned long idx, unsigned long tce);
> diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
> index 8231b17..c0c64d1 100644
> --- a/arch/powerpc/kvm/book3s_64_vio.c
> +++ b/arch/powerpc/kvm/book3s_64_vio.c
> @@ -378,8 +378,7 @@ static long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt,
> if (iommu_tce_check_gpa(stt->page_shift, gpa))
> return H_TOO_HARD;
>
> - if (kvmppc_gpa_to_ua(stt->kvm, tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
> - &ua, NULL))
> + if (kvmppc_tce_to_ua(stt->kvm, tce, &ua, NULL))
> return H_TOO_HARD;
>
> list_for_each_entry_rcu(stit, &stt->iommu_tables, next) {
> @@ -552,8 +551,7 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
>
> idx = srcu_read_lock(&vcpu->kvm->srcu);
>
> - if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
> - tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) {
> + if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua, NULL)) {
> ret = H_PARAMETER;
> goto unlock_exit;
> }
> @@ -614,7 +612,7 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> return ret;
>
> idx = srcu_read_lock(&vcpu->kvm->srcu);
> - if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
> + if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua, NULL)) {
> ret = H_TOO_HARD;
> goto unlock_exit;
> }
> @@ -649,9 +647,7 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> }
> tce = be64_to_cpu(tce);
>
> - if (kvmppc_gpa_to_ua(vcpu->kvm,
> - tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
> - &ua, NULL))
> + if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua, NULL))
> return H_PARAMETER;
>
> list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
> diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c
> index adf3b21..389dac1 100644
> --- a/arch/powerpc/kvm/book3s_64_vio_hv.c
> +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
> @@ -110,8 +110,7 @@ static long kvmppc_rm_tce_validate(struct kvmppc_spapr_tce_table *stt,
> if (iommu_tce_check_gpa(stt->page_shift, gpa))
> return H_PARAMETER;
>
> - if (kvmppc_gpa_to_ua(stt->kvm, tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
> - &ua, NULL))
> + if (kvmppc_tce_to_ua(stt->kvm, tce, &ua, NULL))
> return H_TOO_HARD;
>
> list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
> @@ -180,10 +179,10 @@ void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
> }
> EXPORT_SYMBOL_GPL(kvmppc_tce_put);
>
> -long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
> +long kvmppc_tce_to_ua(struct kvm *kvm, unsigned long tce,
> unsigned long *ua, unsigned long **prmap)
> {
> - unsigned long gfn = gpa >> PAGE_SHIFT;
> + unsigned long gfn = tce >> PAGE_SHIFT;
> struct kvm_memory_slot *memslot;
>
> memslot = search_memslots(kvm_memslots(kvm), gfn);
> @@ -191,7 +190,7 @@ long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
> return -EINVAL;
>
> *ua = __gfn_to_hva_memslot(memslot, gfn) |
> - (gpa & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
> + (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
>
> #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
> if (prmap)
> @@ -200,7 +199,7 @@ long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(kvmppc_gpa_to_ua);
> +EXPORT_SYMBOL_GPL(kvmppc_tce_to_ua);
>
> #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
> static long iommu_tce_xchg_rm(struct mm_struct *mm, struct iommu_table *tbl,
> @@ -389,8 +388,7 @@ long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
> return ret;
>
> dir = iommu_tce_direction(tce);
> - if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
> - tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL))
> + if ((dir != DMA_NONE) && kvmppc_tce_to_ua(vcpu->kvm, tce, &ua, NULL))
> return H_PARAMETER;
>
> entry = ioba >> stt->page_shift;
> @@ -492,7 +490,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> */
> struct mm_iommu_table_group_mem_t *mem;
>
> - if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL))
> + if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua, NULL))
> return H_TOO_HARD;
>
> mem = mm_iommu_lookup_rm(vcpu->kvm->mm, ua, IOMMU_PAGE_SIZE_4K);
> @@ -508,7 +506,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> * We do not require memory to be preregistered in this case
> * so lock rmap and do __find_linux_pte_or_hugepte().
> */
> - if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
> + if (kvmppc_tce_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
> return H_TOO_HARD;
>
> rmap = (void *) vmalloc_to_phys(rmap);
> @@ -542,9 +540,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
>
> ua = 0;
> - if (kvmppc_gpa_to_ua(vcpu->kvm,
> - tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
> - &ua, NULL))
> + if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua, NULL))
> return H_PARAMETER;
>
> list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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