From patchwork Thu Oct 4 11:55:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Mackerras X-Patchwork-Id: 978792 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ozlabs.org header.i=@ozlabs.org header.b="aqTvHdYI"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42QrwJ2v7rzB4MZ for ; Thu, 4 Oct 2018 21:57:04 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727558AbeJDSt0 (ORCPT ); Thu, 4 Oct 2018 14:49:26 -0400 Received: from ozlabs.org ([203.11.71.1]:41467 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727458AbeJDSt0 (ORCPT ); Thu, 4 Oct 2018 14:49:26 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPSA id 42QrvY44mjzB4Mj; Thu, 4 Oct 2018 21:56:25 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; t=1538654185; bh=/3SdPyHOgzFfdGZjSttxsKegQKsjarW3w8x8LJD5yHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aqTvHdYI+8rjb++tnLx0pNJbB7/eo6KiaphiP8qa9jO6z5Pj0fMFt+Z0X9QiLUA29 jGZ8EXvtRlG+9mJoS+qsnWKnInSuxOIyxqKO4gVNdYzyNiXFhNOSFi8Q4pyUQUB88k TQ9iDfMSK2cqHIFDqBxLE6pUD7arOMcJ/K0RpOEkE4AVEMg73Ln6OqcxqWaXqXbg3S kII8s1W8SKyS8JGbD2CljTD9fVSzlYUzdPd0AlwsKbPzMZQtnpwd2NoE+w7cI4tO72 SmcIaRwkcLUVkvpv7Mcsv/ZOM/3paNCt3RRxGdfsx/LlOrAB2hkHkjbOjV4Dgk8+8E qpT/6GstBYK4Q== From: Paul Mackerras To: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org Cc: linuxppc-dev@ozlabs.org, David Gibson Subject: [PATCH v4 15/32] KVM: PPC: Book3S HV: Refactor radix page fault handler Date: Thu, 4 Oct 2018 21:55:52 +1000 Message-Id: <1538654169-15602-16-git-send-email-paulus@ozlabs.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1538654169-15602-1-git-send-email-paulus@ozlabs.org> References: <1538654169-15602-1-git-send-email-paulus@ozlabs.org> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org From: Suraj Jitindar Singh The radix page fault handler accounts for all cases, including just needing to insert a pte. This breaks it up into separate functions for the two main cases; setting rc and inserting a pte. This allows us to make the setting of rc and inserting of a pte generic for any pgtable, not specific to the one for this guest. [paulus@ozlabs.org - reduced diffs from previous code] Reviewed-by: David Gibson Signed-off-by: Suraj Jitindar Singh Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 210 +++++++++++++++++++-------------- 1 file changed, 123 insertions(+), 87 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index f2976f4..47f2b18 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -400,8 +400,9 @@ static void kvmppc_unmap_free_pud_entry_table(struct kvm *kvm, pud_t *pud, */ #define PTE_BITS_MUST_MATCH (~(_PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED)) -static int kvmppc_create_pte(struct kvm *kvm, pte_t pte, unsigned long gpa, - unsigned int level, unsigned long mmu_seq) +static int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, + unsigned long gpa, unsigned int level, + unsigned long mmu_seq) { pgd_t *pgd; pud_t *pud, *new_pud = NULL; @@ -410,7 +411,7 @@ static int kvmppc_create_pte(struct kvm *kvm, pte_t pte, unsigned long gpa, int ret; /* Traverse the guest's 2nd-level tree, allocate new levels needed */ - pgd = kvm->arch.pgtable + pgd_index(gpa); + pgd = pgtable + pgd_index(gpa); pud = NULL; if (pgd_present(*pgd)) pud = pud_offset(pgd, gpa); @@ -565,95 +566,49 @@ static int kvmppc_create_pte(struct kvm *kvm, pte_t pte, unsigned long gpa, return ret; } -int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, - unsigned long ea, unsigned long dsisr) +static bool kvmppc_hv_handle_set_rc(struct kvm *kvm, pgd_t *pgtable, + bool writing, unsigned long gpa) +{ + unsigned long pgflags; + unsigned int shift; + pte_t *ptep; + + /* + * Need to set an R or C bit in the 2nd-level tables; + * since we are just helping out the hardware here, + * it is sufficient to do what the hardware does. + */ + pgflags = _PAGE_ACCESSED; + if (writing) + pgflags |= _PAGE_DIRTY; + /* + * We are walking the secondary (partition-scoped) page table here. + * We can do this without disabling irq because the Linux MM + * subsystem doesn't do THP splits and collapses on this tree. + */ + ptep = __find_linux_pte(pgtable, gpa, NULL, &shift); + if (ptep && pte_present(*ptep) && (!writing || pte_write(*ptep))) { + kvmppc_radix_update_pte(kvm, ptep, 0, pgflags, gpa, shift); + return true; + } + return false; +} + +static int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu, + unsigned long gpa, + struct kvm_memory_slot *memslot, + bool writing, bool kvm_ro, + pte_t *inserted_pte, unsigned int *levelp) { struct kvm *kvm = vcpu->kvm; - unsigned long mmu_seq; - unsigned long gpa, gfn, hva; - struct kvm_memory_slot *memslot; struct page *page = NULL; - long ret; - bool writing; + unsigned long mmu_seq; + unsigned long hva, gfn = gpa >> PAGE_SHIFT; bool upgrade_write = false; bool *upgrade_p = &upgrade_write; pte_t pte, *ptep; - unsigned long pgflags; unsigned int shift, level; - - /* Check for unusual errors */ - if (dsisr & DSISR_UNSUPP_MMU) { - pr_err("KVM: Got unsupported MMU fault\n"); - return -EFAULT; - } - if (dsisr & DSISR_BADACCESS) { - /* Reflect to the guest as DSI */ - pr_err("KVM: Got radix HV page fault with DSISR=%lx\n", dsisr); - kvmppc_core_queue_data_storage(vcpu, ea, dsisr); - return RESUME_GUEST; - } - - /* Translate the logical address and get the page */ - gpa = vcpu->arch.fault_gpa & ~0xfffUL; - gpa &= ~0xF000000000000000ul; - gfn = gpa >> PAGE_SHIFT; - if (!(dsisr & DSISR_PRTABLE_FAULT)) - gpa |= ea & 0xfff; - memslot = gfn_to_memslot(kvm, gfn); - - /* No memslot means it's an emulated MMIO region */ - if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { - if (dsisr & (DSISR_PRTABLE_FAULT | DSISR_BADACCESS | - DSISR_SET_RC)) { - /* - * Bad address in guest page table tree, or other - * unusual error - reflect it to the guest as DSI. - */ - kvmppc_core_queue_data_storage(vcpu, ea, dsisr); - return RESUME_GUEST; - } - return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, - dsisr & DSISR_ISSTORE); - } - - writing = (dsisr & DSISR_ISSTORE) != 0; - if (memslot->flags & KVM_MEM_READONLY) { - if (writing) { - /* give the guest a DSI */ - dsisr = DSISR_ISSTORE | DSISR_PROTFAULT; - kvmppc_core_queue_data_storage(vcpu, ea, dsisr); - return RESUME_GUEST; - } - upgrade_p = NULL; - } - - if (dsisr & DSISR_SET_RC) { - /* - * Need to set an R or C bit in the 2nd-level tables; - * since we are just helping out the hardware here, - * it is sufficient to do what the hardware does. - */ - pgflags = _PAGE_ACCESSED; - if (writing) - pgflags |= _PAGE_DIRTY; - /* - * We are walking the secondary page table here. We can do this - * without disabling irq. - */ - spin_lock(&kvm->mmu_lock); - ptep = __find_linux_pte(kvm->arch.pgtable, - gpa, NULL, &shift); - if (ptep && pte_present(*ptep) && - (!writing || pte_write(*ptep))) { - kvmppc_radix_update_pte(kvm, ptep, 0, pgflags, - gpa, shift); - dsisr &= ~DSISR_SET_RC; - } - spin_unlock(&kvm->mmu_lock); - if (!(dsisr & (DSISR_BAD_FAULT_64S | DSISR_NOHPTE | - DSISR_PROTFAULT | DSISR_SET_RC))) - return RESUME_GUEST; - } + int ret; /* used to check for invalidations in progress */ mmu_seq = kvm->mmu_notifier_seq; @@ -666,7 +621,7 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, * is that the page is writable. */ hva = gfn_to_hva_memslot(memslot, gfn); - if (upgrade_p && __get_user_pages_fast(hva, 1, 1, &page) == 1) { + if (!kvm_ro && __get_user_pages_fast(hva, 1, 1, &page) == 1) { upgrade_write = true; } else { unsigned long pfn; @@ -724,7 +679,12 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, } /* Allocate space in the tree and write the PTE */ - ret = kvmppc_create_pte(kvm, pte, gpa, level, mmu_seq); + ret = kvmppc_create_pte(kvm, kvm->arch.pgtable, pte, gpa, level, + mmu_seq); + if (inserted_pte) + *inserted_pte = pte; + if (levelp) + *levelp = level; if (page) { if (!ret && (pte_val(pte) & _PAGE_WRITE)) @@ -732,6 +692,82 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, put_page(page); } + return ret; +} + +int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, + unsigned long ea, unsigned long dsisr) +{ + struct kvm *kvm = vcpu->kvm; + unsigned long gpa, gfn; + struct kvm_memory_slot *memslot; + long ret; + bool writing = !!(dsisr & DSISR_ISSTORE); + bool kvm_ro = false; + + /* Check for unusual errors */ + if (dsisr & DSISR_UNSUPP_MMU) { + pr_err("KVM: Got unsupported MMU fault\n"); + return -EFAULT; + } + if (dsisr & DSISR_BADACCESS) { + /* Reflect to the guest as DSI */ + pr_err("KVM: Got radix HV page fault with DSISR=%lx\n", dsisr); + kvmppc_core_queue_data_storage(vcpu, ea, dsisr); + return RESUME_GUEST; + } + + /* Translate the logical address */ + gpa = vcpu->arch.fault_gpa & ~0xfffUL; + gpa &= ~0xF000000000000000ul; + gfn = gpa >> PAGE_SHIFT; + if (!(dsisr & DSISR_PRTABLE_FAULT)) + gpa |= ea & 0xfff; + + /* Get the corresponding memslot */ + memslot = gfn_to_memslot(kvm, gfn); + + /* No memslot means it's an emulated MMIO region */ + if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { + if (dsisr & (DSISR_PRTABLE_FAULT | DSISR_BADACCESS | + DSISR_SET_RC)) { + /* + * Bad address in guest page table tree, or other + * unusual error - reflect it to the guest as DSI. + */ + kvmppc_core_queue_data_storage(vcpu, ea, dsisr); + return RESUME_GUEST; + } + return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, writing); + } + + if (memslot->flags & KVM_MEM_READONLY) { + if (writing) { + /* give the guest a DSI */ + kvmppc_core_queue_data_storage(vcpu, ea, DSISR_ISSTORE | + DSISR_PROTFAULT); + return RESUME_GUEST; + } + kvm_ro = true; + } + + /* Failed to set the reference/change bits */ + if (dsisr & DSISR_SET_RC) { + spin_lock(&kvm->mmu_lock); + if (kvmppc_hv_handle_set_rc(kvm, kvm->arch.pgtable, + writing, gpa)) + dsisr &= ~DSISR_SET_RC; + spin_unlock(&kvm->mmu_lock); + + if (!(dsisr & (DSISR_BAD_FAULT_64S | DSISR_NOHPTE | + DSISR_PROTFAULT | DSISR_SET_RC))) + return RESUME_GUEST; + } + + /* Try to insert a pte */ + ret = kvmppc_book3s_instantiate_page(vcpu, gpa, memslot, writing, + kvm_ro, NULL, NULL); + if (ret == 0 || ret == -EAGAIN) ret = RESUME_GUEST; return ret;