From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Leonardo Bras Subject: [PATCH v6 07/11] powerpc/kvm/e500: Use functions to track lockless pgtbl walks Date: Thu, 6 Feb 2020 00:08:56 -0300 Message-ID: <20200206030900.147032-8-leonardo@linux.ibm.com> In-Reply-To: <20200206030900.147032-1-leonardo@linux.ibm.com> References: <20200206030900.147032-1-leonardo@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Arnd Bergmann , Andrew Morton , "Aneesh Kumar K.V" , Nicholas Piggin , Christophe Leroy , Steven Price , Robin Murphy , Leonardo Bras , Mahesh Salgaonkar , Balbir Singh , Reza Arbab , Thomas Gleixner , Allison Randal , Greg Kroah-Hartman , Mike Rapoport , Michal Suchanek Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org List-ID: Message-ID: <20200206030856.Hqv5E3YMmnoMvLuek0B06lVCsWLc35MAS0a3GXA0PA0@z> Applies the new functions used for tracking lockless pgtable walks on kvmppc_e500_shadow_map(). Fixes the place where local_irq_restore() is called: previously, if ptep was NULL, local_irq_restore() would never be called. local_irq_{save,restore} is already inside {begin,end}_lockless_pgtbl_walk, so there is no need to repeat it here. Variable that saves the irq mask was renamed from flags to irq_mask so it doesn't lose meaning now it's not directly passed to local_irq_* functions. Signed-off-by: Leonardo Bras --- arch/powerpc/kvm/e500_mmu_host.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c index 425d13806645..3dcf11f77256 100644 --- a/arch/powerpc/kvm/e500_mmu_host.c +++ b/arch/powerpc/kvm/e500_mmu_host.c @@ -336,7 +336,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, pte_t *ptep; unsigned int wimg = 0; pgd_t *pgdir; - unsigned long flags; + unsigned long irq_mask; /* used to check for invalidations in progress */ mmu_seq = kvm->mmu_notifier_seq; @@ -473,7 +473,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, * We are holding kvm->mmu_lock so a notifier invalidate * can't run hence pfn won't change. */ - local_irq_save(flags); + irq_mask = begin_lockless_pgtbl_walk(); ptep = find_linux_pte(pgdir, hva, NULL, NULL); if (ptep) { pte_t pte = READ_ONCE(*ptep); @@ -481,15 +481,16 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, if (pte_present(pte)) { wimg = (pte_val(pte) >> PTE_WIMGE_SHIFT) & MAS2_WIMGE_MASK; - local_irq_restore(flags); } else { - local_irq_restore(flags); + end_lockless_pgtbl_walk(irq_mask); pr_err_ratelimited("%s: pte not present: gfn %lx,pfn %lx\n", __func__, (long)gfn, pfn); ret = -EINVAL; goto out; } } + end_lockless_pgtbl_walk(irq_mask); + kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg); kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize, -- 2.24.1