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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org QmrDtnJuIFTDtnBlbCA8Ympvcm5Aa2VybmVsLm9yZz4gd3JpdGVzOgoKPiBGcm9tOiBCasO2cm4g VMO2cGVsIDxiam9ybkByaXZvc2luYy5jb20+Cj4KPiBUaGUgUklTQy1WIHBvcnQgY29waWVzIHRo ZSBQR0QgdGFibGUgZnJvbSBpbml0X21tL3N3YXBwZXJfcGdfZGlyIHRvCj4gYWxsIHVzZXJsYW5k IHBhZ2UgdGFibGVzLCB3aGljaCBtZWFucyB0aGF0IGlmIHRoZSBQR0QgbGV2ZWwgdGFibGUgaXMK PiBjaGFuZ2VkLCBvdGhlciBwYWdlIHRhYmxlcyBoYXMgdG8gYmUgdXBkYXRlZCBhcyB3ZWxsLgo+ Cj4gSW5zdGVhZCBvZiBoYXZpbmcgdGhlIFBHRCBjaGFuZ2VzIHJpcHBsZSBvdXQgdG8gYWxsIHRh YmxlcywgdGhlCj4gc3luY2hyb25pemF0aW9uIGNhbiBiZSBhdm9pZGVkIGJ5IHByZS1hbGxvY2F0 aW5nIHRoZSBQR0QgZW50cmllcy9wYWdlcwo+IGF0IGJvb3QsIGF2b2lkaW5nIHRoZSBzeW5jaHJv bml6YXRpb24gYWxsIHRvZ2V0aGVyLgo+Cj4gVGhpcyBpcyBjdXJyZW50bHkgZG9uZSBmb3IgdGhl IGJwZi9tb2R1bGVzLCBhbmQgdm1hbGxvYyBQR0QgcmVnaW9ucy4KPiBFeHRlbmQgdGhpcyBzY2hl bWUgZm9yIHRoZSBQR0QgcmVnaW9ucyB0b3VjaGVkIGJ5IG1lbW9yeSBob3RwbHVnZ2luZy4KPgo+ IFByZXBhcmUgdGhlIFJJU0MtViBwb3J0IGZvciBtZW1vcnkgaG90cGx1ZyBieSBwcmUtYWxsb2Nh dGUKPiB2bWVtbWFwL2RpcmVjdCBtYXAgZW50cmllcyBhdCB0aGUgUEdEIGxldmVsLiBUaGlzIHdp bGwgcm91Z2hseSB3YXN0ZQo+IH4xMjggd29ydGggb2YgNEsgcGFnZXMgd2hlbiBtZW1vcnkgaG90 cGx1Z2dpbmcgaXMgZW5hYmxlZCBpbiB0aGUKPiBrZXJuZWwgY29uZmlndXJhdGlvbi4KPgo+IFJl dmlld2VkLWJ5OiBBbGV4YW5kcmUgR2hpdGkgPGFsZXhnaGl0aUByaXZvc2luYy5jb20+Cj4gU2ln bmVkLW9mZi1ieTogQmrDtnJuIFTDtnBlbCA8Ympvcm5Acml2b3NpbmMuY29tPgo+IC0tLQo+ICBh cmNoL3Jpc2N2L2luY2x1ZGUvYXNtL2thc2FuLmggfCA0ICsrLS0KPiAgYXJjaC9yaXNjdi9tbS9p bml0LmMgICAgICAgICAgIHwgNyArKysrKysrCj4gIDIgZmlsZXMgY2hhbmdlZCwgOSBpbnNlcnRp b25zKCspLCAyIGRlbGV0aW9ucygtKQo+Cj4gZGlmZiAtLWdpdCBhL2FyY2gvcmlzY3YvaW5jbHVk ZS9hc20va2FzYW4uaCBiL2FyY2gvcmlzY3YvaW5jbHVkZS9hc20va2FzYW4uaAo+IGluZGV4IDBi ODVlMzYzZTc3OC4uZTZhMDA3MWJkYjU2IDEwMDY0NAo+IC0tLSBhL2FyY2gvcmlzY3YvaW5jbHVk ZS9hc20va2FzYW4uaAo+ICsrKyBiL2FyY2gvcmlzY3YvaW5jbHVkZS9hc20va2FzYW4uaAo+IEBA IC02LDggKzYsNiBAQAo+ICAKPiAgI2lmbmRlZiBfX0FTU0VNQkxZX18KPiAgCj4gLSNpZmRlZiBD T05GSUdfS0FTQU4KPiAtCj4gIC8qCj4gICAqIFRoZSBmb2xsb3dpbmcgY29tbWVudCB3YXMgY29w aWVkIGZyb20gYXJtNjQ6Cj4gICAqIEtBU0FOX1NIQURPV19TVEFSVDogYmVnaW5uaW5nIG9mIHRo ZSBrZXJuZWwgdmlydHVhbCBhZGRyZXNzZXMuCj4gQEAgLTM0LDYgKzMyLDggQEAKPiAgICovCj4g ICNkZWZpbmUgS0FTQU5fU0hBRE9XX1NUQVJUCSgoS0FTQU5fU0hBRE9XX0VORCAtIEtBU0FOX1NI QURPV19TSVpFKSAmIFBHRElSX01BU0spCj4gICNkZWZpbmUgS0FTQU5fU0hBRE9XX0VORAlNT0RV TEVTX0xPV0VTVF9WQUREUgo+ICsKPiArI2lmZGVmIENPTkZJR19LQVNBTgo+ICAjZGVmaW5lIEtB U0FOX1NIQURPV19PRkZTRVQJX0FDKENPTkZJR19LQVNBTl9TSEFET1dfT0ZGU0VULCBVTCkKPiAg Cj4gIHZvaWQga2FzYW5faW5pdCh2b2lkKTsKPiBkaWZmIC0tZ2l0IGEvYXJjaC9yaXNjdi9tbS9p bml0LmMgYi9hcmNoL3Jpc2N2L21tL2luaXQuYwo+IGluZGV4IGI2NmY4NDZlNzYzNC4uYzk4MDEw ZWRlODEwIDEwMDY0NAo+IC0tLSBhL2FyY2gvcmlzY3YvbW0vaW5pdC5jCj4gKysrIGIvYXJjaC9y aXNjdi9tbS9pbml0LmMKPiBAQCAtMjcsNiArMjcsNyBAQAo+ICAKPiAgI2luY2x1ZGUgPGFzbS9m aXhtYXAuaD4KPiAgI2luY2x1ZGUgPGFzbS9pby5oPgo+ICsjaW5jbHVkZSA8YXNtL2thc2FuLmg+ Cj4gICNpbmNsdWRlIDxhc20vbnVtYS5oPgo+ICAjaW5jbHVkZSA8YXNtL3BndGFibGUuaD4KPiAg I2luY2x1ZGUgPGFzbS9zZWN0aW9ucy5oPgo+IEBAIC0xNDg4LDEwICsxNDg5LDE2IEBAIHN0YXRp YyB2b2lkIF9faW5pdCBwcmVhbGxvY2F0ZV9wZ2RfcGFnZXNfcmFuZ2UodW5zaWduZWQgbG9uZyBz dGFydCwgdW5zaWduZWQgbG9uCj4gIAlwYW5pYygiRmFpbGVkIHRvIHByZS1hbGxvY2F0ZSAlcyBw YWdlcyBmb3IgJXMgYXJlYVxuIiwgbHZsLCBhcmVhKTsKPiAgfQo+ICAKPiArI2RlZmluZSBQQUdF X0VORCBLQVNBTl9TSEFET1dfU1RBUlQKPiArCj4gIHZvaWQgX19pbml0IHBndGFibGVfY2FjaGVf aW5pdCh2b2lkKQo+ICB7Cj4gIAlwcmVhbGxvY2F0ZV9wZ2RfcGFnZXNfcmFuZ2UoVk1BTExPQ19T VEFSVCwgVk1BTExPQ19FTkQsICJ2bWFsbG9jIik7Cj4gIAlpZiAoSVNfRU5BQkxFRChDT05GSUdf TU9EVUxFUykpCj4gIAkJcHJlYWxsb2NhdGVfcGdkX3BhZ2VzX3JhbmdlKE1PRFVMRVNfVkFERFIs IE1PRFVMRVNfRU5ELCAiYnBmL21vZHVsZXMiKTsKPiArCWlmIChJU19FTkFCTEVEKENPTkZJR19N RU1PUllfSE9UUExVRykpIHsKPiArCQlwcmVhbGxvY2F0ZV9wZ2RfcGFnZXNfcmFuZ2UoVk1FTU1B UF9TVEFSVCwgVk1FTU1BUF9FTkQsICJ2bWVtbWFwIik7Cj4gKwkJcHJlYWxsb2NhdGVfcGdkX3Bh Z2VzX3JhbmdlKFBBR0VfT0ZGU0VULCBQQUdFX0VORCwgImRpcmVjdCBtYXAiKTsKCkFsZXggcG9p bnRlZCBvdXQgdGhhdCBLQVNBTiBQR0RzIHNob3VsZCBiZSBwcmVhbGxvY2F0ZWQgYXMgd2VsbCEg SSdsbAphZGRyZXNzIHRoaXMgaW4gdGhlIG5leHQgcmV2aXNpb24uCgoKQmrDtnJuCgpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1yaXNjdiBtYWls aW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5m cmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg== From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED356208D0 for ; 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Tue, 21 May 2024 16:09:30 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id A8CA861BFE; Tue, 21 May 2024 16:09:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1E5AC2BD11; Tue, 21 May 2024 16:09:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716307769; bh=RkSBxB1mPmJZ/DR8Fr08TnX1zxdKqejkPexNssbR7dQ=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=YCo9ASI2Js2y0lYzH+ndmKVe0VBlFTGkycxT7Zujt14aad9AwhyXNS7KaKggq6hOZ CjqBuMvBipIHRI0dSeAnRaGdIWq9dw+lco9sDto8ytsjwHOsLdjahwZxFEMUyF2PJo rsSN3ldZuKLPl165ORt4ogze7omXIAaPwrKrmNWACeG75cOkrx5NAC189ciVuC4xpg Dh8KVRkGsbWFABrokxiEiOf/Gc1ifElhhLSV1S7Fye8UgqFZ5Ir1yPlX4Yr65gHiyY 28FCxQDb2DcdZ6d5HsyVkKt/PaQmniprxTRaBhweDbGOnULeN9u2tGzvd6gEdrMkEp /B4suKzHDu8yg== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: Alexandre Ghiti , Albert Ou , David Hildenbrand , Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org, Oscar Salvador Cc: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Andrew Bresticker , Chethan Seshadri , Lorenzo Stoakes , Santosh Mamila , Sivakumar Munnangi , Sunil V L , linux-kernel@vger.kernel.org, linux-mm@kvack.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v3 2/9] riscv: mm: Pre-allocate vmemmap/direct map PGD entries In-Reply-To: <20240521114830.841660-3-bjorn@kernel.org> References: <20240521114830.841660-1-bjorn@kernel.org> <20240521114830.841660-3-bjorn@kernel.org> Date: Tue, 21 May 2024 18:09:25 +0200 Message-ID: <87frubdu4q.fsf@all.your.base.are.belong.to.us> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Bj=C3=B6rn T=C3=B6pel writes: > From: Bj=C3=B6rn T=C3=B6pel > > The RISC-V port copies the PGD table from init_mm/swapper_pg_dir to > all userland page tables, which means that if the PGD level table is > changed, other page tables has to be updated as well. > > Instead of having the PGD changes ripple out to all tables, the > synchronization can be avoided by pre-allocating the PGD entries/pages > at boot, avoiding the synchronization all together. > > This is currently done for the bpf/modules, and vmalloc PGD regions. > Extend this scheme for the PGD regions touched by memory hotplugging. > > Prepare the RISC-V port for memory hotplug by pre-allocate > vmemmap/direct map entries at the PGD level. This will roughly waste > ~128 worth of 4K pages when memory hotplugging is enabled in the > kernel configuration. > > Reviewed-by: Alexandre Ghiti > Signed-off-by: Bj=C3=B6rn T=C3=B6pel > --- > arch/riscv/include/asm/kasan.h | 4 ++-- > arch/riscv/mm/init.c | 7 +++++++ > 2 files changed, 9 insertions(+), 2 deletions(-) > > diff --git a/arch/riscv/include/asm/kasan.h b/arch/riscv/include/asm/kasa= n.h > index 0b85e363e778..e6a0071bdb56 100644 > --- a/arch/riscv/include/asm/kasan.h > +++ b/arch/riscv/include/asm/kasan.h > @@ -6,8 +6,6 @@ >=20=20 > #ifndef __ASSEMBLY__ >=20=20 > -#ifdef CONFIG_KASAN > - > /* > * The following comment was copied from arm64: > * KASAN_SHADOW_START: beginning of the kernel virtual addresses. > @@ -34,6 +32,8 @@ > */ > #define KASAN_SHADOW_START ((KASAN_SHADOW_END - KASAN_SHADOW_SIZE) & PGD= IR_MASK) > #define KASAN_SHADOW_END MODULES_LOWEST_VADDR > + > +#ifdef CONFIG_KASAN > #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) >=20=20 > void kasan_init(void); > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > index b66f846e7634..c98010ede810 100644 > --- a/arch/riscv/mm/init.c > +++ b/arch/riscv/mm/init.c > @@ -27,6 +27,7 @@ >=20=20 > #include > #include > +#include > #include > #include > #include > @@ -1488,10 +1489,16 @@ static void __init preallocate_pgd_pages_range(un= signed long start, unsigned lon > panic("Failed to pre-allocate %s pages for %s area\n", lvl, area); > } >=20=20 > +#define PAGE_END KASAN_SHADOW_START > + > void __init pgtable_cache_init(void) > { > preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc"); > if (IS_ENABLED(CONFIG_MODULES)) > preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules"); > + if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) { > + preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap"); > + preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map"); Alex pointed out that KASAN PGDs should be preallocated as well! I'll address this in the next revision. Bj=C3=B6rn