From nobody Thu Dec 18 07:12:10 2025 Received: from mail-wr1-f73.google.com (mail-wr1-f73.google.com [209.85.221.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 11FCA1F0990 for ; Thu, 13 Mar 2025 18:11:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741889511; cv=none; b=u4n68U2TIc+TXusYlKf/BKeUSht4i+ZBcV6ptc2MgkVMdCUczIgOzE4qncpn/m/s5HIiR4FVoMSsYJJRIF7TRpbzC9eK15Ewfqdks1MCRc06qu+UtaA+XIO5UnoeDGSgbUWUbFwG8jKajFtim2bvQbAVNfZIkV1wZ6MqfiIX83g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741889511; c=relaxed/simple; bh=fGEeQXrjwKQkQP57EyE86cUhUZbL2LxsT8EcaJSEXxg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=T7x0EWr3KvvROl6uu0LWM2kAszctaOdJfx6ooTNvNnrcn+mB/QMnYUU5o0MTsp3iDw/uOqncwg+78US+dQSVsw4tXuWeVzx9vyU22g8ZRtNAz0h1u3v3soC3mTqmX2cn7f5Rsz0jxX1fRee2hIK8wmDnDNSHimETj+TTF4fZr3E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jackmanb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=yh+Wev4o; arc=none smtp.client-ip=209.85.221.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jackmanb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="yh+Wev4o" Received: by mail-wr1-f73.google.com with SMTP id ffacd0b85a97d-3913aea90b4so554826f8f.2 for ; Thu, 13 Mar 2025 11:11:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1741889508; x=1742494308; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=9PPqJkUj7Pibb+TYCrq8XdoSiIxYoCw22sHO21dNMJ4=; b=yh+Wev4orPFstZVXbA4aeH68SGxxOxexddQYOPGq6MpT1OwPaT9ABnOi6aOpNpXywp odLP5iJz26RddTE/vwcGVVHn+Cusme+rzF2VFi1nkwELRvJferVWacVpW5hugCSdTwmd Ai0Ci1gS9FSv0cCZAcgjHj190/EbOb3FO9dz3qO/mbFLPbkEv/uyJdGkKjCuDx7rUDyF dpMIvzsMZRhSXzuZnwNysI0kYGX1ykhrRisA6pFuArAwOzXkoN41dBeYecZlOKK60XKd sOQ1BHvmd0nw5E4k7jcXQqogPJxL9BlZYgUp4PXtAFdxcXgchlubDyEDwT+Ji5RNoszl efpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741889508; x=1742494308; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=9PPqJkUj7Pibb+TYCrq8XdoSiIxYoCw22sHO21dNMJ4=; b=Q9miIolT7vjrRAjlv9OAooYmIW5HcT8DC0HdXw4E+hQqMLdfFoQkHnBGwKdqeJKO1x jrY/QbNUt4AZN/WuBrnhA1QQXama4ELZex4y6+3DvFf/vRMpwxlIM1OKRZZ0nfhwOV1/ bDbthuQX1CkLdM1BxkFlseTjhCA80Zz7l6T5lz7/WcwYTqe0ytNbyYODUD7ax7M2NfV5 uJnJFBaZRWiUAsCz3/j9fzbc+7uc1qvrsoXhsximywI3sFn6XyB0gD4aXnqTxbppC9nr grrejZE0Q1QyzUlsfwjJATycoL/8RrEdfIzkVOjmN/2w4Sps+BHRyQL9VnrnwajPcpVp E4aA== X-Gm-Message-State: AOJu0Yw+nHtBkMeseTXpD06+Myr3sRJJI9rotCQk8fBSsNmip4l68MDK K0zOovB2nX2tfLn14Kvl4UbX/jxp9P2LVlvjjJuhFzxaavhTMVOP6trFzrQesuXOZAICHRiZpHs 0UXFTZM3MEg== X-Google-Smtp-Source: AGHT+IF8ERnTvg3YNcVI2WgDobZeTnOtswaGwtLGXdYxevgaK+phqTml6l4yAXJ9Dw4d5FjayQ84d9+Hw+R0XA== X-Received: from wmbfm8.prod.google.com ([2002:a05:600c:c08:b0:43b:c9cc:b9b3]) (user=jackmanb job=prod-delivery.src-stubby-dispatcher) by 2002:a5d:598c:0:b0:391:3988:1c7c with SMTP id ffacd0b85a97d-396c2105ea6mr522202f8f.24.1741889508450; Thu, 13 Mar 2025 11:11:48 -0700 (PDT) Date: Thu, 13 Mar 2025 18:11:23 +0000 In-Reply-To: <20250313-asi-page-alloc-v1-0-04972e046cea@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250313-asi-page-alloc-v1-0-04972e046cea@google.com> X-Mailer: b4 0.14.2 Message-ID: <20250313-asi-page-alloc-v1-4-04972e046cea@google.com> Subject: [PATCH RFC 04/11] x86/mm/asi: Sync physmap into ASI_GLOBAL_NONSENSITIVE From: Brendan Jackman To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Andrew Morton , David Rientjes , Vlastimil Babka , David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mike Rapoport , Junaid Shahid , Reiji Watanabe , Patrick Bellasi , Brendan Jackman , Yosry Ahmed Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Mirror the physmap into the ASI pagetables, but with a maximum granularity that's guaranteed to allow changing pageblock sensitivity without having to allocate pagetables. Signed-off-by: Brendan Jackman --- arch/x86/mm/init_64.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 8f75274fddd96b8285aff48493ebad93e30daebe..4ca6bb419b9643b0e72cb5b6da6= d905f2b2be84b 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -7,6 +7,7 @@ * Copyright (C) 2002,2003 Andi Kleen */ =20 +#include #include #include #include @@ -736,7 +737,8 @@ phys_pgd_init(pgd_t *pgd_page, unsigned long paddr_star= t, unsigned long paddr_en { unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last; =20 - *pgd_changed =3D false; + if (pgd_changed) + *pgd_changed =3D false; =20 paddr_last =3D paddr_end; vaddr =3D (unsigned long)__va(paddr_start); @@ -770,9 +772,13 @@ phys_pgd_init(pgd_t *pgd_page, unsigned long paddr_sta= rt, unsigned long paddr_en (pud_t *) p4d, init); =20 spin_unlock(&init_mm.page_table_lock); - *pgd_changed =3D true; + if (pgd_changed) + *pgd_changed =3D true; } =20 + if (pgd_changed) + sync_global_pgds(vaddr_start, vaddr_end - 1); + return paddr_last; } =20 @@ -784,9 +790,29 @@ __kernel_physical_mapping_init(unsigned long paddr_sta= rt, { bool pgd_changed; unsigned long paddr_last; + pgd_t *pgd_asi =3D asi_pgd(ASI_GLOBAL_NONSENSITIVE); =20 paddr_last =3D phys_pgd_init(init_mm.pgd, paddr_start, paddr_end, page_si= ze_mask, prot, init, &pgd_changed); + + /* + * Set up ASI's global-nonsensitive physmap. This needs to mapped at max + * 2M size so that regions can be mapped and unmapped at pageblock + * granularity without requiring allocations. + */ + if (pgd_asi) { + /* + * Since most memory is expected to end up sensitive, start with + * everything unmapped in this pagetable. The page allocator + * assumes that's the case. + */ + pgprot_t prot_np =3D __pgprot(pgprot_val(prot) & ~_PAGE_PRESENT); + + VM_BUG_ON((PAGE_SHIFT + pageblock_order) < page_level_shift(PG_LEVEL_2M)= ); + phys_pgd_init(pgd_asi, paddr_start, paddr_end, 1 << PG_LEVEL_2M, + prot_np, init, NULL); + } + if (pgd_changed) sync_global_pgds((unsigned long)__va(paddr_start), (unsigned long)__va(paddr_end) - 1); --=20 2.49.0.rc1.451.g8f38331e32-goog