From patchwork Thu Jul 5 14:08:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 10509503 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 9CFCF6024A for ; Thu, 5 Jul 2018 14:25:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8AB06281DB for ; Thu, 5 Jul 2018 14:25:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DD4C28E1A; Thu, 5 Jul 2018 14:25:49 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id F1C10281DB for ; Thu, 5 Jul 2018 14:25:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=xUN5iiD4/eWbE271skTeRIgBXvEt5Bi1w1wRuztixvk=; b=DjacuVgJI+NutfC+2pro3DSI7b aGFyRHITic1NgxU1/DqvyuIqZz5FDqPnB7vONVn9cXxD+Ieh4/Nxq3O5WPwMVYOrZ+h58P0pDdffr a40/KbOcAdC6oPYHMoTAIizrRZbN7mTp2IJb253CiYrQ5SyM70EnoZqntGxK9kzHmz+fu2g/vdyun sL1sX4apZsTPrj32p3E5Xmk95bkyZGmvuUor/Qh0WX3Wni+5sq5v2k/ymVuYC3NevHthYhVsgBzac MgaPQFbgXdGda4V+dmTkQ0d9eYU3urayoCPEiYqPvNhwXW/6lUpsF6cw6HB52xAqlnnig/lDCmBLC lDTMcUlA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fb5Cb-0007w9-Mu; Thu, 05 Jul 2018 14:25:45 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fb5CQ-0007KT-Sv for linux-arm-kernel@bombadil.infradead.org; Thu, 05 Jul 2018 14:25:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=oz/5/U4gESkaUEUdUff/zPA9d0Hr7ZZRxJDqaYJZ4EM=; b=CNp8uBIpNqfHXaHj7XIV2RYNO gI/0x8q52Mq9tghSvXJb1XcFxj43RjdVGOszRoqVbMP/4h+R1y99rC1h4/OM7ViLrNXQCj3774Knz y+cnkHnbGr1XuVB95vCXUkwfchhLsdrYTJRqpVEsJNZMS5LoFGpO9ty/iOwl3hoNy5XS/Rmxsa0t4 VZ0Ju1g4gTZyMPTUd//TdZ4f8I3E040dYc8wwsdPgzWwjaagCBivpdNDOiEj/lz5WcZlRQ1XdV00W lkWSw5MRe3ytVV6JFy5WbQG9IxDTamtuAk52sAPt/Dhp37Bp2eWTJPs0gkgia9s1I6ytBItUK4uEH /ph7mf0Ng==; Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by casper.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fb4xD-0005hA-Bf for linux-arm-kernel@lists.infradead.org; Thu, 05 Jul 2018 14:09:53 +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 9C7AA1650; Thu, 5 Jul 2018 07:09:47 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.206.33]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1E6063F5BA; Thu, 5 Jul 2018 07:09:46 -0700 (PDT) From: Punit Agrawal To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v4 5/7] KVM: arm64: Support handling access faults for PUD hugepages Date: Thu, 5 Jul 2018 15:08:48 +0100 Message-Id: <20180705140850.5801-6-punit.agrawal@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180705140850.5801-1-punit.agrawal@arm.com> References: <20180705140850.5801-1-punit.agrawal@arm.com> X-ARM-No-Footer: FoSSMail X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180705_150951_706726_93DC085D X-CRM114-Status: GOOD ( 14.30 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: suzuki.poulose@arm.com, marc.zyngier@arm.com, Catalin Marinas , Punit Agrawal , Will Deacon , christoffer.dall@arm.com, linux-kernel@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org 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 In preparation for creating larger hugepages at Stage 2, extend the access fault handling at Stage 2 to support PUD hugepages when encountered. Provide trivial helpers for arm32 to allow sharing of code. Signed-off-by: Punit Agrawal Cc: Christoffer Dall Cc: Marc Zyngier Cc: Russell King Cc: Catalin Marinas Cc: Will Deacon --- arch/arm/include/asm/kvm_mmu.h | 8 ++++++++ arch/arm64/include/asm/kvm_mmu.h | 7 +++++++ arch/arm64/include/asm/pgtable.h | 6 ++++++ virt/kvm/arm/mmu.c | 14 +++++++++++++- 4 files changed, 34 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h index d05c8986e495..a4298d429efc 100644 --- a/arch/arm/include/asm/kvm_mmu.h +++ b/arch/arm/include/asm/kvm_mmu.h @@ -78,6 +78,8 @@ void kvm_clear_hyp_idmap(void); #define kvm_pfn_pte(pfn, prot) pfn_pte(pfn, prot) #define kvm_pfn_pmd(pfn, prot) pfn_pmd(pfn, prot) +#define kvm_pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) + #define kvm_pmd_mkhuge(pmd) pmd_mkhuge(pmd) /* @@ -102,6 +104,12 @@ static inline bool kvm_s2pud_exec(pud_t *pud) return false; } +static inline pud_t kvm_s2pud_mkyoung(pud_t pud) +{ + BUG(); + return pud; +} + static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd) { *pmd = new_pmd; diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 15bc1be8f82f..4d2780c588b0 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -175,6 +175,8 @@ void kvm_clear_hyp_idmap(void); #define kvm_pfn_pte(pfn, prot) pfn_pte(pfn, prot) #define kvm_pfn_pmd(pfn, prot) pfn_pmd(pfn, prot) +#define kvm_pud_pfn(pud) pud_pfn(pud) + #define kvm_pmd_mkhuge(pmd) pmd_mkhuge(pmd) static inline pte_t kvm_s2pte_mkwrite(pte_t pte) @@ -254,6 +256,11 @@ static inline bool kvm_s2pud_exec(pud_t *pudp) return !(READ_ONCE(pud_val(*pudp)) & PUD_S2_XN); } +static inline pud_t kvm_s2pud_mkyoung(pud_t pud) +{ + return pud_mkyoung(pud); +} + static inline bool kvm_page_empty(void *ptr) { struct page *ptr_page = virt_to_page(ptr); diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 1bdeca8918a6..a64a5c35beb1 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -314,6 +314,11 @@ static inline pte_t pud_pte(pud_t pud) return __pte(pud_val(pud)); } +static inline pud_t pte_pud(pte_t pte) +{ + return __pud(pte_val(pte)); +} + static inline pmd_t pud_pmd(pud_t pud) { return __pmd(pud_val(pud)); @@ -380,6 +385,7 @@ static inline int pmd_protnone(pmd_t pmd) #define pfn_pmd(pfn,prot) __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) +#define pud_mkyoung(pud) pte_pud(pte_mkyoung(pud_pte(pud))) #define pud_write(pud) pte_write(pud_pte(pud)) #define __pud_to_phys(pud) __pte_to_phys(pud_pte(pud)) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index ccdea0edabb3..94a91bcdd152 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1609,6 +1609,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, */ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) { + pud_t *pud; pmd_t *pmd; pte_t *pte; kvm_pfn_t pfn; @@ -1618,7 +1619,18 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) spin_lock(&vcpu->kvm->mmu_lock); - pmd = stage2_get_pmd(vcpu->kvm, NULL, fault_ipa); + pud = stage2_get_pud(vcpu->kvm, NULL, fault_ipa); + if (!pud || pud_none(*pud)) + goto out; /* Nothing there */ + + if (pud_huge(*pud)) { /* HugeTLB */ + *pud = kvm_s2pud_mkyoung(*pud); + pfn = kvm_pud_pfn(*pud); + pfn_valid = true; + goto out; + } + + pmd = stage2_pmd_offset(pud, fault_ipa); if (!pmd || pmd_none(*pmd)) /* Nothing there */ goto out;