diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-05-05 10:17:21 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-05 14:20:15 +0300 |
| commit | e3d8ed5518c7f50e24d2530b36d14b6c4284769f (patch) | |
| tree | 1551c83aca3a737aef357d534f72013d938548e1 | |
| parent | 9781e759b3258bc607296bc1bf7cc314b7bfd0fc (diff) | |
| download | linux-e3d8ed5518c7f50e24d2530b36d14b6c4284769f.tar.xz | |
powerpc/kvm/book3s: Use find_kvm_host_pte in h_enter
Since kvmppc_do_h_enter can get called in realmode use low level
arch_spin_lock which is safe to be called in realmode.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200505071729.54912-15-aneesh.kumar@linux.ibm.com
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_hv.c | 5 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_mmu.c | 22 |
2 files changed, 8 insertions, 19 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 8f9cd4c79044..18aed9775a3c 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -281,11 +281,10 @@ static long kvmppc_virtmode_do_h_enter(struct kvm *kvm, unsigned long flags, { long ret; - /* Protect linux PTE lookup from page table destruction */ - rcu_read_lock_sched(); /* this disables preemption too */ + preempt_disable(); ret = kvmppc_do_h_enter(kvm, flags, pte_index, pteh, ptel, kvm->mm->pgd, false, pte_idx_ret); - rcu_read_unlock_sched(); + preempt_enable(); if (ret == H_TOO_HARD) { /* this can't happen */ pr_err("KVM: Oops, kvmppc_h_enter returned too hard!\n"); diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 03f8347de48b..83e987fecf97 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -210,7 +210,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, pte_t *ptep; unsigned int writing; unsigned long mmu_seq; - unsigned long rcbits, irq_flags = 0; + unsigned long rcbits; if (kvm_is_radix(kvm)) return H_FUNCTION; @@ -248,17 +248,9 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, /* Translate to host virtual address */ hva = __gfn_to_hva_memslot(memslot, gfn); - /* - * If we had a page table table change after lookup, we would - * retry via mmu_notifier_retry. - */ - if (!realmode) - local_irq_save(irq_flags); - /* - * If called in real mode we have MSR_EE = 0. Otherwise - * we disable irq above. - */ - ptep = __find_linux_pte(pgdir, hva, NULL, &hpage_shift); + + arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock); + ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &hpage_shift); if (ptep) { pte_t pte; unsigned int host_pte_size; @@ -272,8 +264,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, * to <= host page size, if host is using hugepage */ if (host_pte_size < psize) { - if (!realmode) - local_irq_restore(flags); + arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock); return H_PARAMETER; } pte = kvmppc_read_update_linux_pte(ptep, writing); @@ -287,8 +278,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, pa |= gpa & ~PAGE_MASK; } } - if (!realmode) - local_irq_restore(irq_flags); + arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock); ptel &= HPTE_R_KEY | HPTE_R_PP0 | (psize-1); ptel |= pa; |