From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5F26C433ED for ; Thu, 29 Apr 2021 16:41:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B24A26140C for ; Thu, 29 Apr 2021 16:41:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240858AbhD2Qmg (ORCPT ); Thu, 29 Apr 2021 12:42:36 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:20617 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240836AbhD2Qmf (ORCPT ); Thu, 29 Apr 2021 12:42:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619714508; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=r9z+cICtQ43gomqRuZQazwMWmwGDEnE1Yh3d+ya3MAA=; b=EkmXTqFC+GFzcuVHwpg8/8ADd95xuPrsNFzhu4TWxwG02bGgHKtF2hYXYzHihkb7gvUpG8 81dutWpI6jEtbhAzIldFHfeoZWXbQX/ZI2LCVKHoK94LW8raTOKNZvDmoiHF5AWR5ngFhf B3y4cq1TdGdByxYyJ/gH3gy6EmR7Vgk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-38-56l9UMn-N66Fn2a_khwOKw-1; Thu, 29 Apr 2021 12:41:46 -0400 X-MC-Unique: 56l9UMn-N66Fn2a_khwOKw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B38E8107DEEF; Thu, 29 Apr 2021 16:41:45 +0000 (UTC) Received: from gator.redhat.com (unknown [10.40.192.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4A3025D6DC; Thu, 29 Apr 2021 16:41:44 +0000 (UTC) From: Andrew Jones To: kvm@vger.kernel.org Cc: alexandru.elisei@arm.com, nikos.nikoleris@arm.com, andre.przywara@arm.com, eric.auger@redhat.com Subject: [PATCH kvm-unit-tests v3 4/8] arm/arm64: mmu: Stop mapping an assumed IO region Date: Thu, 29 Apr 2021 18:41:26 +0200 Message-Id: <20210429164130.405198-5-drjones@redhat.com> In-Reply-To: <20210429164130.405198-1-drjones@redhat.com> References: <20210429164130.405198-1-drjones@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org By providing a proper ioremap function, we can just rely on devices calling it for each region they need (as they already do) instead of mapping a big assumed I/O range. We don't require the MMU to be enabled at the time of the ioremap. In that case, we add the mapping to the identity map anyway. This allows us to call setup_vm after io_init. Why don't we just call setup_vm before io_init, I hear you ask? Well, that's because tests like sieve want to start with the MMU off, later call setup_vm, and all the while have working I/O. Some unit tests are just really demanding... While at it, ensure we map the I/O regions with XN (execute never), as suggested by Alexandru Elisei. Signed-off-by: Andrew Jones --- lib/arm/asm/io.h | 6 ++++++ lib/arm/asm/mmu.h | 3 +++ lib/arm/asm/page.h | 2 ++ lib/arm/asm/pgtable-hwdef.h | 1 + lib/arm/mmu.c | 37 +++++++++++++++++++++++++++---------- lib/arm64/asm/io.h | 6 ++++++ lib/arm64/asm/mmu.h | 1 + lib/arm64/asm/page.h | 2 ++ 8 files changed, 48 insertions(+), 10 deletions(-) diff --git a/lib/arm/asm/io.h b/lib/arm/asm/io.h index ba3b0b2412ad..e4caa6ff5d1e 100644 --- a/lib/arm/asm/io.h +++ b/lib/arm/asm/io.h @@ -77,6 +77,12 @@ static inline void __raw_writel(u32 val, volatile void __iomem *addr) : "r" (val)); } +#define ioremap ioremap +static inline void __iomem *ioremap(phys_addr_t phys_addr, size_t size) +{ + return __ioremap(phys_addr, size); +} + #define virt_to_phys virt_to_phys static inline phys_addr_t virt_to_phys(const volatile void *x) { diff --git a/lib/arm/asm/mmu.h b/lib/arm/asm/mmu.h index 122874b8aebe..94e70f0a84bf 100644 --- a/lib/arm/asm/mmu.h +++ b/lib/arm/asm/mmu.h @@ -8,10 +8,13 @@ #include #define PTE_USER L_PTE_USER +#define PTE_UXN L_PTE_XN +#define PTE_PXN L_PTE_PXN #define PTE_RDONLY PTE_AP2 #define PTE_SHARED L_PTE_SHARED #define PTE_AF PTE_EXT_AF #define PTE_WBWA L_PTE_MT_WRITEALLOC +#define PTE_UNCACHED L_PTE_MT_UNCACHED /* See B3.18.7 TLB maintenance operations */ diff --git a/lib/arm/asm/page.h b/lib/arm/asm/page.h index 1fb5cd26ac66..8eb4a883808e 100644 --- a/lib/arm/asm/page.h +++ b/lib/arm/asm/page.h @@ -47,5 +47,7 @@ typedef struct { pteval_t pgprot; } pgprot_t; extern phys_addr_t __virt_to_phys(unsigned long addr); extern unsigned long __phys_to_virt(phys_addr_t addr); +extern void *__ioremap(phys_addr_t phys_addr, size_t size); + #endif /* !__ASSEMBLY__ */ #endif /* _ASMARM_PAGE_H_ */ diff --git a/lib/arm/asm/pgtable-hwdef.h b/lib/arm/asm/pgtable-hwdef.h index fe1d8540ea3f..90fd306c7cc0 100644 --- a/lib/arm/asm/pgtable-hwdef.h +++ b/lib/arm/asm/pgtable-hwdef.h @@ -34,6 +34,7 @@ #define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */ #define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */ #define L_PTE_YOUNG (_AT(pteval_t, 1) << 10) /* AF */ +#define L_PTE_PXN (_AT(pteval_t, 1) << 53) /* PXN */ #define L_PTE_XN (_AT(pteval_t, 1) << 54) /* XN */ /* diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c index 15eef007f256..791b1f88f946 100644 --- a/lib/arm/mmu.c +++ b/lib/arm/mmu.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "alloc_page.h" #include "vmalloc.h" @@ -157,9 +158,8 @@ void mmu_set_range_sect(pgd_t *pgtable, uintptr_t virt_offset, void *setup_mmu(phys_addr_t phys_end) { uintptr_t code_end = (uintptr_t)&etext; - struct mem_region *r; - /* 0G-1G = I/O, 1G-3G = identity, 3G-4G = vmalloc */ + /* 3G-4G region is reserved for vmalloc, cap phys_end at 3G */ if (phys_end > (3ul << 30)) phys_end = 3ul << 30; @@ -170,14 +170,8 @@ void *setup_mmu(phys_addr_t phys_end) "Unsupported translation granule %ld\n", PAGE_SIZE); #endif - mmu_idmap = alloc_page(); - - for (r = mem_regions; r->end; ++r) { - if (!(r->flags & MR_F_IO)) - continue; - mmu_set_range_sect(mmu_idmap, r->start, r->start, r->end, - __pgprot(PMD_SECT_UNCACHED | PMD_SECT_USER)); - } + if (!mmu_idmap) + mmu_idmap = alloc_page(); /* armv8 requires code shared between EL1 and EL0 to be read-only */ mmu_set_range_ptes(mmu_idmap, PHYS_OFFSET, @@ -192,6 +186,29 @@ void *setup_mmu(phys_addr_t phys_end) return mmu_idmap; } +void __iomem *__ioremap(phys_addr_t phys_addr, size_t size) +{ + phys_addr_t paddr_aligned = phys_addr & PAGE_MASK; + phys_addr_t paddr_end = PAGE_ALIGN(phys_addr + size); + pgprot_t prot = __pgprot(PTE_UNCACHED | PTE_USER | PTE_UXN | PTE_PXN); + pgd_t *pgtable; + + assert(sizeof(long) == 8 || !(phys_addr >> 32)); + + if (mmu_enabled()) { + pgtable = current_thread_info()->pgtable; + } else { + if (!mmu_idmap) + mmu_idmap = alloc_page(); + pgtable = mmu_idmap; + } + + mmu_set_range_ptes(pgtable, paddr_aligned, paddr_aligned, + paddr_end, prot); + + return (void __iomem *)(unsigned long)phys_addr; +} + phys_addr_t __virt_to_phys(unsigned long addr) { if (mmu_enabled()) { diff --git a/lib/arm64/asm/io.h b/lib/arm64/asm/io.h index e0a03b250d5b..be19f471c0fa 100644 --- a/lib/arm64/asm/io.h +++ b/lib/arm64/asm/io.h @@ -71,6 +71,12 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) return val; } +#define ioremap ioremap +static inline void __iomem *ioremap(phys_addr_t phys_addr, size_t size) +{ + return __ioremap(phys_addr, size); +} + #define virt_to_phys virt_to_phys static inline phys_addr_t virt_to_phys(const volatile void *x) { diff --git a/lib/arm64/asm/mmu.h b/lib/arm64/asm/mmu.h index 72d75eafc882..72371b2d9fe3 100644 --- a/lib/arm64/asm/mmu.h +++ b/lib/arm64/asm/mmu.h @@ -8,6 +8,7 @@ #include #define PMD_SECT_UNCACHED PMD_ATTRINDX(MT_DEVICE_nGnRE) +#define PTE_UNCACHED PTE_ATTRINDX(MT_DEVICE_nGnRE) #define PTE_WBWA PTE_ATTRINDX(MT_NORMAL) static inline void flush_tlb_all(void) diff --git a/lib/arm64/asm/page.h b/lib/arm64/asm/page.h index ae4484b22114..d0fac6ea563d 100644 --- a/lib/arm64/asm/page.h +++ b/lib/arm64/asm/page.h @@ -72,5 +72,7 @@ typedef struct { pteval_t pgprot; } pgprot_t; extern phys_addr_t __virt_to_phys(unsigned long addr); extern unsigned long __phys_to_virt(phys_addr_t addr); +extern void *__ioremap(phys_addr_t phys_addr, size_t size); + #endif /* !__ASSEMBLY__ */ #endif /* _ASMARM64_PAGE_H_ */ -- 2.30.2