From patchwork Tue Jun 7 10:58:28 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 9160403 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 33E8960777 for ; Tue, 7 Jun 2016 11:03:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 211C924151 for ; Tue, 7 Jun 2016 11:03:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1628C28179; Tue, 7 Jun 2016 11:03:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 71B9C24151 for ; Tue, 7 Jun 2016 11:03:44 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bAElr-0000v8-1Y; Tue, 07 Jun 2016 11:02:07 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bAEjH-00050t-DI for linux-arm-kernel@lists.infradead.org; Tue, 07 Jun 2016 10:59:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A5BF9950; Tue, 7 Jun 2016 03:59:27 -0700 (PDT) Received: from approximate.cambridge.arm.com (approximate.cambridge.arm.com [10.1.209.129]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 938E73F213; Tue, 7 Jun 2016 03:58:52 -0700 (PDT) From: Marc Zyngier To: Christoffer Dall Subject: [PATCH 08/15] arm/arm64: KVM: Always have merged page tables Date: Tue, 7 Jun 2016 11:58:28 +0100 Message-Id: <1465297115-13091-9-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1465297115-13091-1-git-send-email-marc.zyngier@arm.com> References: <1465297115-13091-1-git-send-email-marc.zyngier@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160607_035927_822177_79F5D2E9 X-CRM114-Status: GOOD ( 17.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP We're in a position where we can now always have "merged" page tables, where both the runtime mapping and the idmap coexist. This results in some code being removed, but there is more to come. Signed-off-by: Marc Zyngier --- arch/arm/kvm/mmu.c | 74 +++++++++++++++++++++++--------------------------- arch/arm64/kvm/reset.c | 31 +++++---------------- 2 files changed, 41 insertions(+), 64 deletions(-) diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index d6ecbf1..9a17e14 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -492,13 +492,12 @@ void free_boot_hyp_pgd(void) if (boot_hyp_pgd) { unmap_hyp_range(boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE); - unmap_hyp_range(boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order); boot_hyp_pgd = NULL; } if (hyp_pgd) - unmap_hyp_range(hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); + unmap_hyp_range(hyp_pgd, hyp_idmap_start, PAGE_SIZE); mutex_unlock(&kvm_hyp_pgd_mutex); } @@ -1690,7 +1689,7 @@ phys_addr_t kvm_mmu_get_boot_httbr(void) if (__kvm_cpu_uses_extended_idmap()) return virt_to_phys(merged_hyp_pgd); else - return virt_to_phys(boot_hyp_pgd); + return virt_to_phys(hyp_pgd); } phys_addr_t kvm_get_idmap_vector(void) @@ -1703,6 +1702,22 @@ phys_addr_t kvm_get_idmap_start(void) return hyp_idmap_start; } +static int kvm_map_idmap_text(pgd_t *pgd) +{ + int err; + + /* Create the idmap in the boot page tables */ + err = __create_hyp_mappings(pgd, + hyp_idmap_start, hyp_idmap_end, + __phys_to_pfn(hyp_idmap_start), + PAGE_HYP); + if (err) + kvm_err("Failed to idmap %lx-%lx\n", + hyp_idmap_start, hyp_idmap_end); + + return err; +} + int kvm_mmu_init(void) { int err; @@ -1718,27 +1733,25 @@ int kvm_mmu_init(void) BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK); hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); - boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); - - if (!hyp_pgd || !boot_hyp_pgd) { + if (!hyp_pgd) { kvm_err("Hyp mode PGD not allocated\n"); err = -ENOMEM; goto out; } - /* Create the idmap in the boot page tables */ - err = __create_hyp_mappings(boot_hyp_pgd, - hyp_idmap_start, hyp_idmap_end, - __phys_to_pfn(hyp_idmap_start), - PAGE_HYP); + if (__kvm_cpu_uses_extended_idmap()) { + boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + hyp_pgd_order); + if (!boot_hyp_pgd) { + kvm_err("Hyp boot PGD not allocated\n"); + err = -ENOMEM; + goto out; + } - if (err) { - kvm_err("Failed to idmap %lx-%lx\n", - hyp_idmap_start, hyp_idmap_end); - goto out; - } + err = kvm_map_idmap_text(boot_hyp_pgd); + if (err) + goto out; - if (__kvm_cpu_uses_extended_idmap()) { merged_hyp_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); if (!merged_hyp_pgd) { kvm_err("Failed to allocate extra HYP pgd\n"); @@ -1746,29 +1759,10 @@ int kvm_mmu_init(void) } __kvm_extend_hypmap(boot_hyp_pgd, hyp_pgd, merged_hyp_pgd, hyp_idmap_start); - return 0; - } - - /* Map the very same page at the trampoline VA */ - err = __create_hyp_mappings(boot_hyp_pgd, - TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, - __phys_to_pfn(hyp_idmap_start), - PAGE_HYP); - if (err) { - kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n", - TRAMPOLINE_VA); - goto out; - } - - /* Map the same page again into the runtime page tables */ - err = __create_hyp_mappings(hyp_pgd, - TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, - __phys_to_pfn(hyp_idmap_start), - PAGE_HYP); - if (err) { - kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n", - TRAMPOLINE_VA); - goto out; + } else { + err = kvm_map_idmap_text(hyp_pgd); + if (err) + goto out; } return 0; diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index b1ad730..d044ca3 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -133,30 +133,13 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) return kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq); } -extern char __hyp_idmap_text_start[]; - unsigned long kvm_hyp_reset_entry(void) { - if (!__kvm_cpu_uses_extended_idmap()) { - unsigned long offset; - - /* - * Find the address of __kvm_hyp_reset() in the trampoline page. - * This is present in the running page tables, and the boot page - * tables, so we call the code here to start the trampoline - * dance in reverse. - */ - offset = (unsigned long)__kvm_hyp_reset - - ((unsigned long)__hyp_idmap_text_start & PAGE_MASK); - - return TRAMPOLINE_VA + offset; - } else { - /* - * KVM is running with merged page tables, which don't have the - * trampoline page mapped. We know the idmap is still mapped, - * but can't be called into directly. Use - * __extended_idmap_trampoline to do the call. - */ - return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline); - } + /* + * KVM is running with merged page tables, which don't have the + * trampoline page mapped. We know the idmap is still mapped, + * but can't be called into directly. Use + * __extended_idmap_trampoline to do the call. + */ + return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline); }