From nobody Mon Feb 9 01:16:52 2026 Received: from mail-ej1-f73.google.com (mail-ej1-f73.google.com [209.85.218.73]) (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 81F1820FA9D for ; Wed, 16 Apr 2025 16:09:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744819749; cv=none; b=m35nh7J37YWvvVIf2eeE884shY9MU7g+3BWUWTAXUOtsQrfDkedwLbUnFovKa8Q4MINNZ7AvqY355atqjJi8tMw3a9Afxn3/tSGmYSgBr9FJYu4BnwY0tf7OUzECPcfbhM/r13FRux4zizk31XxtHHyc24bG6kpx0esNEQrLmg8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744819749; c=relaxed/simple; bh=Phj6Z8bd0z00tKtTpT2UJxiQehIZbjeTZC1Km0GG+JQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=FceX3NL2TvHlH0IGNK8fCfxDix5WPtd5LzzaUwcPgMrPEt9sEUd5GhOv2dUkq83/anuIxXgTBrVstPJchALFvzddBQ1JiCAbjqN1w5ZV4ACMx5YH/E5FbMOS75irZ63OwwVXJo7R08adcTsa4lY8RNj9lUi77IHi+fxMYtvcmIM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--qperret.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=xszPPFL7; arc=none smtp.client-ip=209.85.218.73 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--qperret.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="xszPPFL7" Received: by mail-ej1-f73.google.com with SMTP id a640c23a62f3a-ac6ce5fe9bfso709375766b.1 for ; Wed, 16 Apr 2025 09:09:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744819746; x=1745424546; 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=Qk46ikY00j+5+57DCaLJRftXVwdO91Q7aH3vc94jYB4=; b=xszPPFL7gY/Tz3vD+t7ful0kctKp1Jwk9hSAnKDtwraU4wuXmB4lv48prEEZVVhIxx TiZFy5k8n+u+LVOJo3ttKUnvyOyYknJm47Mgl3E04jNDkuG79jPryGg97oPSD192GBDM eY+VcTRhIxpQ8jo2gj35HK1JGNOm5ZzdsroAVi/4Z7Fr+CFrKXtaIdqtJhG+6pJp+a16 R4NAroOi0xJyq1/ZKsYHjTievv1SGJMJ4Vy5qc1nM8opJje1+b7yfqv2j1I8/oCelioZ rNFLEqS0YizjfqTk8e5LK7V7sonBq+8XT76gaBs3Iyrb1KWfoR4luuR5iQedlZ3GnQiY lIUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744819746; x=1745424546; 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=Qk46ikY00j+5+57DCaLJRftXVwdO91Q7aH3vc94jYB4=; b=WKC3uaSMsmoivgcEcu+w6Yhh3kpSFmF8UUp32IyN4jHmTE0nnEJgzRG97k8Lrmvy7a iKqOt2VWzc7AySshBDhSEr9EFNhFB1lR9vsvcYTY/xfm/A761NzEZ6/VnBuNsRQ+tAyJ /WYfYKvM2uZBWDubnfUJtDY8n+ohD+wuIYbPcr0YcUzXh3eTQZl0GF6wBOj55jdaAqDI JxFd7PS+Bs92kLtfAh+RvSyL6KY9E+ua2Gl4Q/sXB1fW1/D2u1TlM2buFJOPOxpPPUsR boy1eNE8h9zXQ8N2No3A1rwRo11u1xzXE6fhHD9d4ihzZ3+VJdL0WfG+PCJlXLXkds3e S27A== X-Forwarded-Encrypted: i=1; AJvYcCWbpB5K/a/gc+1QiDLhr0aKZNMeUZigqxTK7k3HZSyrHqK+p+6Savb2HvcuG0VgCoHQWg3pBfdMm+jNsZ8=@vger.kernel.org X-Gm-Message-State: AOJu0YzLBrgRsSQclAg5EK2vxRwegWx6wnbxAtcxs5EN7ODZE0aCrkmr A/UBedie1SPMOycldzfYElxXpq+NAxPyPLBi1HtwOHcfqGJjnOCl/fzAjaZ2zwZk+J+EXIwV9OW iIk6WiA== X-Google-Smtp-Source: AGHT+IF0Qgk4Z9REtBCKxe6tx7t27J9UAsPYpAOJnWiB4lAJ8d3qRn0XaVBtwgLkIydXHfh5DlnZK0uF0PD6 X-Received: from edcf13.prod.google.com ([2002:a50:a6cd:0:b0:5ec:d8f6:4a7a]) (user=qperret job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:97c5:b0:ac6:f4c1:b797 with SMTP id a640c23a62f3a-acb42987babmr251744266b.19.1744819745708; Wed, 16 Apr 2025 09:09:05 -0700 (PDT) Date: Wed, 16 Apr 2025 16:08:57 +0000 In-Reply-To: <20250416160900.3078417-1-qperret@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250416160900.3078417-1-qperret@google.com> X-Mailer: git-send-email 2.49.0.604.gff1f9ca942-goog Message-ID: <20250416160900.3078417-2-qperret@google.com> Subject: [PATCH v3 1/4] KVM: arm64: Add .hyp.data section From: Quentin Perret To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon Cc: Quentin Perret , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: David Brazdil The hypervisor has not needed its own .data section because all globals were either .rodata or .bss. To avoid having to initialize future data-structures at run-time, let's introduce add a .data section to the hypervisor. Signed-off-by: David Brazdil Signed-off-by: Quentin Perret --- arch/arm64/include/asm/sections.h | 1 + arch/arm64/kernel/image-vars.h | 2 ++ arch/arm64/kernel/vmlinux.lds.S | 18 +++++++++++++++--- arch/arm64/kvm/arm.c | 7 +++++++ arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 2 ++ arch/arm64/kvm/hyp/nvhe/setup.c | 4 ++++ arch/arm64/kvm/pkvm.c | 1 + 7 files changed, 32 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sec= tions.h index 40971ac1303f..51b0d594239e 100644 --- a/arch/arm64/include/asm/sections.h +++ b/arch/arm64/include/asm/sections.h @@ -11,6 +11,7 @@ extern char __alt_instructions[], __alt_instructions_end[= ]; extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[]; extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[]; extern char __hyp_text_start[], __hyp_text_end[]; +extern char __hyp_data_start[], __hyp_data_end[]; extern char __hyp_rodata_start[], __hyp_rodata_end[]; extern char __hyp_reloc_begin[], __hyp_reloc_end[]; extern char __hyp_bss_start[], __hyp_bss_end[]; diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 5e3c4b58f279..9c5345f1ab66 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -131,6 +131,8 @@ KVM_NVHE_ALIAS(__hyp_text_start); KVM_NVHE_ALIAS(__hyp_text_end); KVM_NVHE_ALIAS(__hyp_bss_start); KVM_NVHE_ALIAS(__hyp_bss_end); +KVM_NVHE_ALIAS(__hyp_data_start); +KVM_NVHE_ALIAS(__hyp_data_end); KVM_NVHE_ALIAS(__hyp_rodata_start); KVM_NVHE_ALIAS(__hyp_rodata_end); =20 diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.ld= s.S index e73326bd3ff7..7c770053f072 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -13,7 +13,7 @@ *(__kvm_ex_table) \ __stop___kvm_ex_table =3D .; =20 -#define HYPERVISOR_DATA_SECTIONS \ +#define HYPERVISOR_RODATA_SECTIONS \ HYP_SECTION_NAME(.rodata) : { \ . =3D ALIGN(PAGE_SIZE); \ __hyp_rodata_start =3D .; \ @@ -23,6 +23,15 @@ __hyp_rodata_end =3D .; \ } =20 +#define HYPERVISOR_DATA_SECTION \ + HYP_SECTION_NAME(.data) : { \ + . =3D ALIGN(PAGE_SIZE); \ + __hyp_data_start =3D .; \ + *(HYP_SECTION_NAME(.data)) \ + . =3D ALIGN(PAGE_SIZE); \ + __hyp_data_end =3D .; \ + } + #define HYPERVISOR_PERCPU_SECTION \ . =3D ALIGN(PAGE_SIZE); \ HYP_SECTION_NAME(.data..percpu) : { \ @@ -51,7 +60,8 @@ #define SBSS_ALIGN PAGE_SIZE #else /* CONFIG_KVM */ #define HYPERVISOR_EXTABLE -#define HYPERVISOR_DATA_SECTIONS +#define HYPERVISOR_RODATA_SECTIONS +#define HYPERVISOR_DATA_SECTION #define HYPERVISOR_PERCPU_SECTION #define HYPERVISOR_RELOC_SECTION #define SBSS_ALIGN 0 @@ -190,7 +200,7 @@ SECTIONS /* everything from this point to __init_begin will be marked RO NX */ RO_DATA(PAGE_SIZE) =20 - HYPERVISOR_DATA_SECTIONS + HYPERVISOR_RODATA_SECTIONS =20 .got : { *(.got) } /* @@ -295,6 +305,8 @@ SECTIONS _sdata =3D .; RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN) =20 + HYPERVISOR_DATA_SECTION + /* * Data written with the MMU off but read with the MMU on requires * cache lines to be invalidated, discarding up to a Cache Writeback diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 68fec8c95fee..58e8119f66bd 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -2604,6 +2604,13 @@ static int __init init_hyp_mode(void) goto out_err; } =20 + err =3D create_hyp_mappings(kvm_ksym_ref(__hyp_data_start), + kvm_ksym_ref(__hyp_data_end), PAGE_HYP); + if (err) { + kvm_err("Cannot map .hyp.data section\n"); + goto out_err; + } + err =3D create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start), kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO); if (err) { diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hy= p.lds.S index f4562f417d3f..d724f6d69302 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S @@ -25,5 +25,7 @@ SECTIONS { BEGIN_HYP_SECTION(.data..percpu) PERCPU_INPUT(L1_CACHE_BYTES) END_HYP_SECTION + HYP_SECTION(.bss) + HYP_SECTION(.data) } diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setu= p.c index 955c431af5d0..2050bb5a6de7 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -119,6 +119,10 @@ static int recreate_hyp_mappings(phys_addr_t phys, uns= igned long size, if (ret) return ret; =20 + ret =3D pkvm_create_mappings(__hyp_data_start, __hyp_data_end, PAGE_HYP); + if (ret) + return ret; + ret =3D pkvm_create_mappings(__hyp_rodata_start, __hyp_rodata_end, PAGE_H= YP_RO); if (ret) return ret; diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 0f89157d31fd..c462140e640a 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -262,6 +262,7 @@ static int __init finalize_pkvm(void) * at, which would end badly once inaccessible. */ kmemleak_free_part(__hyp_bss_start, __hyp_bss_end - __hyp_bss_start); + kmemleak_free_part(__hyp_data_start, __hyp_data_end - __hyp_data_start); kmemleak_free_part(__hyp_rodata_start, __hyp_rodata_end - __hyp_rodata_st= art); kmemleak_free_part_phys(hyp_mem_base, hyp_mem_size); =20 --=20 2.49.0.604.gff1f9ca942-goog