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Wed, 21 Apr 2021 08:19:55 -0400 (EDT) Received: by mail.kernel.org (Postfix) with ESMTPSA id 530AD6145E; Wed, 21 Apr 2021 12:19:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619007594; bh=0a/68dskNDkLo1uroY57KwbRLZLoROR0e1l6xfjDK20=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=vKCh5xS88oZEFh3+M2mJmlwblhZLKM9ca2XwXEkYyFGXs/vJENDTcp2+xVkbz/Mzj a336WGXWzU9a73VFVT3k//XwYrweCrOwX9FoEZ+l+wMJLIS6ZWccT0MXaPLhgkIcoW Xn/V1hwDCFfL9dCpaHCPUWV8flXl+ZDAdyfpfjvTPz9BhcB5j2/YiiIP8EDCvXkMTa SGZLlMLO3ygFxsXJzDB/5B+/T9wRSQ+Lh7rx5YMShZc41aJh9h/IMyNNdqcC5Xvk2k jILPvY/LEsPWuJkwDiIP0ddmDjA84qv4go3Q++WnfolKm5AxJlm7flKGb1N5EeO33H huVQegj1NaxhQ== Date: Wed, 21 Apr 2021 15:19:45 +0300 From: Mike Rapoport To: Anshuman Khandual Subject: Re: [PATCH v2 3/4] arm64: decouple check whether pfn is in linear map from pfn_valid() Message-ID: References: <20210421065108.1987-1-rppt@kernel.org> <20210421065108.1987-4-rppt@kernel.org> <0a7cc0d4-5d3d-7d6d-f4c3-bb2965b810e6@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <0a7cc0d4-5d3d-7d6d-f4c3-bb2965b810e6@arm.com> Cc: David Hildenbrand , Catalin Marinas , linux-kernel@vger.kernel.org, Mike Rapoport , linux-mm@kvack.org, kvmarm@lists.cs.columbia.edu, Marc Zyngier , Andrew Morton , Will Deacon , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Wed, Apr 21, 2021 at 04:29:48PM +0530, Anshuman Khandual wrote: > > On 4/21/21 12:21 PM, Mike Rapoport wrote: > > From: Mike Rapoport > > > > The intended semantics of pfn_valid() is to verify whether there is a > > struct page for the pfn in question and nothing else. > > > > Yet, on arm64 it is used to distinguish memory areas that are mapped in the > > linear map vs those that require ioremap() to access them. > > > > Introduce a dedicated pfn_is_map_memory() wrapper for > > memblock_is_map_memory() to perform such check and use it where > > appropriate. > > > > Using a wrapper allows to avoid cyclic include dependencies. > > > > Signed-off-by: Mike Rapoport > > --- > > arch/arm64/include/asm/memory.h | 2 +- > > arch/arm64/include/asm/page.h | 1 + > > arch/arm64/kvm/mmu.c | 2 +- > > arch/arm64/mm/init.c | 11 +++++++++++ > > arch/arm64/mm/ioremap.c | 4 ++-- > > arch/arm64/mm/mmu.c | 2 +- > > 6 files changed, 17 insertions(+), 5 deletions(-) > > > > diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h > > index 0aabc3be9a75..194f9f993d30 100644 > > --- a/arch/arm64/include/asm/memory.h > > +++ b/arch/arm64/include/asm/memory.h > > @@ -351,7 +351,7 @@ static inline void *phys_to_virt(phys_addr_t x) > > > > #define virt_addr_valid(addr) ({ \ > > __typeof__(addr) __addr = __tag_reset(addr); \ > > - __is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \ > > + __is_lm_address(__addr) && pfn_is_map_memory(virt_to_pfn(__addr)); \ > > }) > > > > void dump_mem_limit(void); > > diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h > > index 012cffc574e8..99a6da91f870 100644 > > --- a/arch/arm64/include/asm/page.h > > +++ b/arch/arm64/include/asm/page.h > > @@ -38,6 +38,7 @@ void copy_highpage(struct page *to, struct page *from); > > typedef struct page *pgtable_t; > > > > extern int pfn_valid(unsigned long); > > +extern int pfn_is_map_memory(unsigned long); > > Check patch is complaining about this. > > WARNING: function definition argument 'unsigned long' should also have an identifier name > #50: FILE: arch/arm64/include/asm/page.h:41: > +extern int pfn_is_map_memory(unsigned long); > > > > > > #include > > > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > > index 8711894db8c2..23dd99e29b23 100644 > > --- a/arch/arm64/kvm/mmu.c > > +++ b/arch/arm64/kvm/mmu.c > > @@ -85,7 +85,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) > > > > static bool kvm_is_device_pfn(unsigned long pfn) > > { > > - return !pfn_valid(pfn); > > + return !pfn_is_map_memory(pfn); > > } > > > > /* > > diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > > index 3685e12aba9b..dc03bdc12c0f 100644 > > --- a/arch/arm64/mm/init.c > > +++ b/arch/arm64/mm/init.c > > @@ -258,6 +258,17 @@ int pfn_valid(unsigned long pfn) > > } > > EXPORT_SYMBOL(pfn_valid); > > > > +int pfn_is_map_memory(unsigned long pfn) > > +{ > > + phys_addr_t addr = PFN_PHYS(pfn); > > + > > Should also bring with it, the comment regarding upper bits in > the pfn from arm64 pfn_valid(). I think a reference to the comment in pfn_valid() will suffice. BTW, I wonder how is that other architectures do not need this check? > > + if (PHYS_PFN(addr) != pfn) > > + return 0; > > + > > ^^^^^ trailing spaces here. > > ERROR: trailing whitespace > #81: FILE: arch/arm64/mm/init.c:263: > +^I$ Oops :) > > + return memblock_is_map_memory(addr); > > +} > > +EXPORT_SYMBOL(pfn_is_map_memory); > > + > > Is the EXPORT_SYMBOL() required to build drivers which will use > pfn_is_map_memory() but currently use pfn_valid() ? Yes, this is required for virt_addr_valid() that is used by modules. -- Sincerely yours, Mike. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm