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Thu, 15 Jan 2026 15:25:28 +0000 Message-ID: <094591b6-97eb-4cae-aa08-fececcba4ba1@amazon.com> Date: Thu, 15 Jan 2026 15:25:27 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 01/13] set_memory: add folio_{zap, restore}_direct_map helpers To: Heiko Carstens , "Kalyazin, Nikita" CC: "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kernel@xen0n.name" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "loongarch@lists.linux.dev" , "pbonzini@redhat.com" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "joey.gouly@arm.com" , "suzuki.poulose@arm.com" , "yuzenghui@huawei.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "seanjc@google.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "luto@kernel.org" , "peterz@infradead.org" , "willy@infradead.org" , "akpm@linux-foundation.org" , "david@kernel.org" , "lorenzo.stoakes@oracle.com" , "Liam.Howlett@oracle.com" , "vbabka@suse.cz" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "martin.lau@linux.dev" , "eddyz87@gmail.com" , "song@kernel.org" , "yonghong.song@linux.dev" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" , "sdf@fomichev.me" , "haoluo@google.com" , "jolsa@kernel.org" , "jgg@ziepe.ca" , "jhubbard@nvidia.com" , "peterx@redhat.com" , "jannh@google.com" , "pfalcato@suse.de" , "shuah@kernel.org" , "riel@surriel.com" , "ryan.roberts@arm.com" , "jgross@suse.com" , "yu-cheng.yu@intel.com" , "kas@kernel.org" , "coxu@redhat.com" , "kevin.brodsky@arm.com" , "ackerleytng@google.com" , "maobibo@loongson.cn" , "prsampat@amd.com" , "mlevitsk@redhat.com" , "jmattson@google.com" , "jthoughton@google.com" , "agordeev@linux.ibm.com" , "alex@ghiti.fr" , "aou@eecs.berkeley.edu" , "borntraeger@linux.ibm.com" , "chenhuacai@kernel.org" , "dev.jain@arm.com" , "gor@linux.ibm.com" , "Jonathan.Cameron@huawei.com" , "palmer@dabbelt.com" , "pjw@kernel.org" , "shijie@os.amperecomputing.com" , "svens@linux.ibm.com" , "thuth@redhat.com" , "wyihan@google.com" , "yang@os.amperecomputing.com" , "vannapurve@google.com" , "jackmanb@google.com" , "aneesh.kumar@kernel.org" , "patrick.roy@linux.dev" , "Thomson, Jack" , "Itazuri, Takahiro" , "Manwaring, Derek" , "Cali, Marco" References: <20260114134510.1835-1-kalyazin@amazon.com> <20260114134510.1835-2-kalyazin@amazon.com> <20260115121209.7060B42-hca@linux.ibm.com> Content-Language: en-US From: Nikita Kalyazin Autocrypt: addr=kalyazin@amazon.com; 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charset="us-ascii"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 15/01/2026 12:12, Heiko Carstens wrote: > On Wed, Jan 14, 2026 at 01:45:23PM +0000, Kalyazin, Nikita wrote: >> From: Nikita Kalyazin >> >> These allow guest_memfd to remove its memory from the direct map. >> Only implement them for architectures that have direct map. >> In folio_zap_direct_map(), flush TLB on architectures where >> set_direct_map_valid_noflush() does not flush it internally. > > ... > >> diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c >> index d3ce04a4b248..df4a487b484d 100644 >> --- a/arch/s390/mm/pageattr.c >> +++ b/arch/s390/mm/pageattr.c >> @@ -412,6 +412,24 @@ int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) >> return __set_memory((unsigned long)page_to_virt(page), nr, flags); >> } >> >> +int folio_zap_direct_map(struct folio *folio) >> +{ >> + unsigned long addr = (unsigned long)folio_address(folio); >> + int ret; >> + >> + ret = set_direct_map_valid_noflush(folio_page(folio, 0), >> + folio_nr_pages(folio), false); >> + flush_tlb_kernel_range(addr, addr + folio_size(folio)); >> + >> + return ret; >> +} > > The instructions used in the s390 implementation of > set_direct_map_valid_noflush() do flush TLB entries. > The extra flush_tlb_kernel_range() is not required. Thanks, Heiko. Will update in the next version. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv