From patchwork Mon Jun 22 20:08:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 11619067 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5E36E60D for ; Mon, 22 Jun 2020 20:15:18 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 344842073E for ; Mon, 22 Jun 2020 20:15:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="1Fd7JHDt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 344842073E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version: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=kPJ/RH27339EJyMNBDyzCxZsqGox7Hpe/Hx6zQQRTdI=; b=1Fd7JHDtx39GOI8F3ALFMmiH5 VLsOrGB7V2Y1rKnoTsSIdCbe1EuV3Vrgi3YGzMWT9m51O2kBXwl2DDtIXBm/lw8gbIcFhSQEpUSvW IsfWZ0EpqIjAmv1OgT9Nfu1+25tx3JklGPk1wlPAIsasE+0LrGxnJ42nwS56uKe0bcdtSFLTTzJ6L iDlYjB0I8nbrno2fWgZOCMXH8rRSNJx2eR4/fsgjhzcUJayQH9xFuWrQQ3NXbD+ivAs6wfTfEa9zD HpNDSxdQKoJwtJb/Q+8KVvdcpcR4zjGk6QWqWCWeviUDXj+8JjstqPgQyIq+CYivlljxg7is+aDf/ hVu78etXg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jnSoh-000881-QO; Mon, 22 Jun 2020 20:13:19 +0000 Received: from mga12.intel.com ([192.55.52.136]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jnSmA-0006Gp-OI for linux-arm-kernel@lists.infradead.org; Mon, 22 Jun 2020 20:10:43 +0000 IronPort-SDR: 7nPo0Uqv38Cl/mPyPVzZRGrQAdan3cAr6hxaAWGB+MSO4TXk9qV+/EdYvEOMUVkqvV9fkLitZF gUK3FEcHsCuQ== X-IronPort-AV: E=McAfee;i="6000,8403,9660"; a="123527794" X-IronPort-AV: E=Sophos;i="5.75,268,1589266800"; d="scan'208";a="123527794" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2020 13:09:24 -0700 IronPort-SDR: S0AGKdxaV2/u+N+F3lumX5TRjKNFIoPRxUgSeSIzcKckYitlAsdbJF0VyW/tYg1r44XXN6fKSC wZHJ3ehoWXkw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,268,1589266800"; d="scan'208";a="318877138" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.152]) by FMSMGA003.fm.intel.com with ESMTP; 22 Jun 2020 13:09:23 -0700 From: Sean Christopherson To: Marc Zyngier , Paolo Bonzini , Arnd Bergmann Subject: [PATCH v2 21/21] KVM: MIPS: Use common KVM implementation of MMU memory caches Date: Mon, 22 Jun 2020 13:08:22 -0700 Message-Id: <20200622200822.4426-22-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200622200822.4426-1-sean.j.christopherson@intel.com> References: <20200622200822.4426-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [192.55.52.136 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Junaid Shahid , Christoffer Dall , Wanpeng Li , kvm@vger.kernel.org, Suzuki K Poulose , Joerg Roedel , Peter Shier , linux-mips@vger.kernel.org, Sean Christopherson , linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Ben Gardon , Vitaly Kuznetsov , Peter Feiner , kvmarm@lists.cs.columbia.edu, Julien Thierry , Jim Mattson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Move to the common MMU memory cache implementation now that the common code and MIPS's existing code are semantically compatible. No functional change intended. Suggested-by: Christoffer Dall Signed-off-by: Sean Christopherson --- arch/mips/include/asm/Kbuild | 1 - arch/mips/include/asm/kvm_host.h | 11 --------- arch/mips/include/asm/kvm_types.h | 7 ++++++ arch/mips/kvm/mmu.c | 40 ++++--------------------------- 4 files changed, 12 insertions(+), 47 deletions(-) create mode 100644 arch/mips/include/asm/kvm_types.h diff --git a/arch/mips/include/asm/Kbuild b/arch/mips/include/asm/Kbuild index 397e6d24d2ab..8643d313890e 100644 --- a/arch/mips/include/asm/Kbuild +++ b/arch/mips/include/asm/Kbuild @@ -5,7 +5,6 @@ generated-y += syscall_table_64_n32.h generated-y += syscall_table_64_n64.h generated-y += syscall_table_64_o32.h generic-y += export.h -generic-y += kvm_types.h generic-y += local64.h generic-y += mcs_spinlock.h generic-y += parport.h diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 363e7a89d173..f49617175f60 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -335,17 +335,6 @@ struct kvm_mips_tlb { long tlb_lo[2]; }; -#define KVM_NR_MEM_OBJS 4 - -/* - * We don't want allocation failures within the mmu code, so we preallocate - * enough memory for a single page fault in a cache. - */ -struct kvm_mmu_memory_cache { - int nobjs; - void *objects[KVM_NR_MEM_OBJS]; -}; - #define KVM_MIPS_AUX_FPU 0x1 #define KVM_MIPS_AUX_MSA 0x2 diff --git a/arch/mips/include/asm/kvm_types.h b/arch/mips/include/asm/kvm_types.h new file mode 100644 index 000000000000..213754d9ef6b --- /dev/null +++ b/arch/mips/include/asm/kvm_types.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_MIPS_KVM_TYPES_H +#define _ASM_MIPS_KVM_TYPES_H + +#define KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE 4 + +#endif /* _ASM_MIPS_KVM_TYPES_H */ diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index 41a4a063a730..d6acd88c0c46 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -25,39 +25,9 @@ #define KVM_MMU_CACHE_MIN_PAGES 2 #endif -static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, int min) -{ - void *page; - - if (cache->nobjs >= min) - return 0; - while (cache->nobjs < ARRAY_SIZE(cache->objects)) { - page = (void *)__get_free_page(GFP_KERNEL_ACCOUNT); - if (!page) - return -ENOMEM; - cache->objects[cache->nobjs++] = page; - } - return 0; -} - -static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) -{ - while (mc->nobjs) - free_page((unsigned long)mc->objects[--mc->nobjs]); -} - -static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) -{ - void *p; - - BUG_ON(!mc || !mc->nobjs); - p = mc->objects[--mc->nobjs]; - return p; -} - void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) { - mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); + kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); } /** @@ -151,7 +121,7 @@ static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache, if (!cache) return NULL; - new_pmd = mmu_memory_cache_alloc(cache); + new_pmd = kvm_mmu_memory_cache_alloc(cache); pmd_init((unsigned long)new_pmd, (unsigned long)invalid_pte_table); pud_populate(NULL, pud, new_pmd); @@ -162,7 +132,7 @@ static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache, if (!cache) return NULL; - new_pte = mmu_memory_cache_alloc(cache); + new_pte = kvm_mmu_memory_cache_alloc(cache); clear_page(new_pte); pmd_populate_kernel(NULL, pmd, new_pte); } @@ -709,7 +679,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, goto out; /* We need a minimum of cached pages ready for page table creation */ - err = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES); + err = kvm_mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES); if (err) goto out; @@ -793,7 +763,7 @@ static pte_t *kvm_trap_emul_pte_for_gva(struct kvm_vcpu *vcpu, int ret; /* We need a minimum of cached pages ready for page table creation */ - ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES); + ret = kvm_mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES); if (ret) return NULL;