From nobody Tue Dec 16 00:56:14 2025 Received: from mail-wr1-f74.google.com (mail-wr1-f74.google.com [209.85.221.74]) (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 C36AC26FD9E for ; Wed, 21 May 2025 12:51:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747831881; cv=none; b=k5pCt4Ni6nm1GY5t+oYegoDpZG3VnCTfn/c4PD89bV7KecKKBOGy2tLJpC/jcazQNwUc/GhgpKULQRnQZMNrUCHivunSC0Q06yokSTJ0oIFZ4KhHOkxtFYjDj84OhLuSSeqRKLz49Po5WIPULGKm+1D55tLiZyuH3KN30oZUNaw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747831881; c=relaxed/simple; bh=m9dI9Rg8h/c091GpkdF/1r+aT4iwGTUctJ0aDf1/BoU=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=UAPCz3hS3Tt0keSS1o5uQu+JddNAp1N4HLK0EEDpg4SIefDbGdvKnbnV8Kk3ZmDm/jQGk96yT+0vCPkORwfG1fiCQ3+YXu5O0piKgGl8cFbI+FKbi6bf55X2IHSRNRnuP9k0ACZqgPKb9V1Lnl421wB6jLZaBMEUTCVRYUO/JWw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=hFiiSQ9h; arc=none smtp.client-ip=209.85.221.74 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--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hFiiSQ9h" Received: by mail-wr1-f74.google.com with SMTP id ffacd0b85a97d-3a364d121ccso1917259f8f.2 for ; Wed, 21 May 2025 05:51:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1747831878; x=1748436678; 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=THRS6RUOhVQKyz2pzkS3iWtym7smEtX3sb7fjdkvEcQ=; b=hFiiSQ9hz2sdq0EZkVXhlPfuGqibinRHSN52UuEwRz9eouPYsB26agthhCsFxl9ZAh 3tciCZ15xrRWK8wRCVo5xR2RiRVX3GlDQAQNhceK3NrQgKSGRYsgZy8vY82BGqj2bWOi hFFOgddz+STh+dcKTa3lUV1bEt/QJeVmysagfqXTCEXxsbZtRx0De4LckT1x757XyxSX C+1LnRBtwIe1TkU498FpgrvDVCkT4LjcT9OiS42A6AWpInpTFhxApQGwF4+HI8JAZz6K OYXUrZNnrt5qEneHBMnIlmohe43TYRC/j7YCRPOSpc/dkpKtf0j7/tNUyNWyHuzLCyYl B7Cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747831878; x=1748436678; 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=THRS6RUOhVQKyz2pzkS3iWtym7smEtX3sb7fjdkvEcQ=; b=U1BUbtg4bbP7FBUJPK5xoBYQXgR0Ce7pKFIACAuqr7TJV95mAmFFpL+1goB9SI9LO2 2qfs4tsmcB7lGd98gCA6EEAQwpPcYuNLbl3ForBZaKNyEWWZ7zKYgedhyYmrfrI1v7vL Na0DqillX8fQypmixqfAVIqHbp9Ll4mjRPKYqMCAoxpTAgWaHjcO1diEffPDrc48vA8s 13x60mVKYtVZFm/gx94W5EXO9MpzrjFh4utrvydgI3hpt9eiGGD1FaB7o3+0NhLXHnFQ ei4Yk68x+n7/jPpMIHSh937H9nLIIHH3Vjtpc4JmlgubxK525bjzkAkDQADINdIkEyjQ jgTQ== X-Forwarded-Encrypted: i=1; AJvYcCX30ldlcwLtwczD/suEB0am80i0V+bNhKERo0nVTMDcuywx/GzhvWkaDlmWxjyF6Gs3cX0zSWWmrY8rpKA=@vger.kernel.org X-Gm-Message-State: AOJu0YwWMW60k9C/9nJWlaBdnN/Z+HRj0vPMLcKZ0ctKvcsZwtnfNpDQ I+mPTUCCvqSIeErv9okT3iLPVUyTMkIlgvoV/F5Rx3z7mwDhPaWXjKHptkASc8gIBYeLPDx6n57 /RqpS2nD+0JsqZ3gOgaULYQ== X-Google-Smtp-Source: AGHT+IGhYVIBRuADQr6WRByKd7PpHl5cm15NxpBtNtkX8ms0Vg3sLjAj+oF4iS4GtuyYvGveuHPK8YSVEQ+prz7R X-Received: from wmbhc24.prod.google.com ([2002:a05:600c:8718:b0:441:bf4e:899c]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:4304:b0:3a3:6ae4:6615 with SMTP id ffacd0b85a97d-3a36ae46750mr10498053f8f.13.1747831878332; Wed, 21 May 2025 05:51:18 -0700 (PDT) Date: Wed, 21 May 2025 13:48:32 +0100 In-Reply-To: <20250521124834.1070650-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250521124834.1070650-1-vdonnefort@google.com> X-Mailer: git-send-email 2.49.0.1112.g889b7c5bd8-goog Message-ID: <20250521124834.1070650-9-vdonnefort@google.com> Subject: [PATCH v6 08/10] KVM: arm64: Add a range to pkvm_mappings From: Vincent Donnefort To: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org Cc: qperret@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@android.com, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Quentin Perret In preparation for supporting stage-2 huge mappings for np-guest, add a nr_pages member for pkvm_mappings to allow EL1 to track the size of the stage-2 mapping. Signed-off-by: Quentin Perret Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm= _pkvm.h index da75d41c948c..ea58282f59bb 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -173,6 +173,7 @@ struct pkvm_mapping { struct rb_node node; u64 gfn; u64 pfn; + u64 nr_pages; u64 __subtree_last; /* Internal member for interval tree */ }; =20 diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 8a1a2faf66a8..b1a65f50c02a 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -264,7 +264,7 @@ static u64 __pkvm_mapping_start(struct pkvm_mapping *m) =20 static u64 __pkvm_mapping_end(struct pkvm_mapping *m) { - return (m->gfn + 1) * PAGE_SIZE - 1; + return (m->gfn + m->nr_pages) * PAGE_SIZE - 1; } =20 INTERVAL_TREE_DEFINE(struct pkvm_mapping, node, u64, __subtree_last, @@ -305,7 +305,8 @@ static int __pkvm_pgtable_stage2_unmap(struct kvm_pgtab= le *pgt, u64 start, u64 e return 0; =20 for_each_mapping_in_range_safe(pgt, start, end, mapping) { - ret =3D kvm_call_hyp_nvhe(__pkvm_host_unshare_guest, handle, mapping->gf= n, 1); + ret =3D kvm_call_hyp_nvhe(__pkvm_host_unshare_guest, handle, mapping->gf= n, + mapping->nr_pages); if (WARN_ON(ret)) return ret; pkvm_mapping_remove(mapping, &pgt->pkvm_mappings); @@ -335,16 +336,32 @@ int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, = u64 addr, u64 size, return -EINVAL; =20 lockdep_assert_held_write(&kvm->mmu_lock); - ret =3D kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, 1, prot); - if (ret) { - /* Is the gfn already mapped due to a racing vCPU? */ - if (ret =3D=3D -EPERM) + + /* + * Calling stage2_map() on top of existing mappings is either happening b= ecause of a race + * with another vCPU, or because we're changing between page and block ma= ppings. As per + * user_mem_abort(), same-size permission faults are handled in the relax= _perms() path. + */ + mapping =3D pkvm_mapping_iter_first(&pgt->pkvm_mappings, addr, addr + siz= e - 1); + if (mapping) { + if (size =3D=3D (mapping->nr_pages * PAGE_SIZE)) return -EAGAIN; + + /* Remove _any_ pkvm_mapping overlapping with the range, bigger or small= er. */ + ret =3D __pkvm_pgtable_stage2_unmap(pgt, addr, addr + size); + if (ret) + return ret; + mapping =3D NULL; } =20 + ret =3D kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, size / PAGE_= SIZE, prot); + if (WARN_ON(ret)) + return ret; + swap(mapping, cache->mapping); mapping->gfn =3D gfn; mapping->pfn =3D pfn; + mapping->nr_pages =3D size / PAGE_SIZE; pkvm_mapping_insert(mapping, &pgt->pkvm_mappings); =20 return ret; @@ -366,7 +383,8 @@ int pkvm_pgtable_stage2_wrprotect(struct kvm_pgtable *p= gt, u64 addr, u64 size) =20 lockdep_assert_held(&kvm->mmu_lock); for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping) { - ret =3D kvm_call_hyp_nvhe(__pkvm_host_wrprotect_guest, handle, mapping->= gfn, 1); + ret =3D kvm_call_hyp_nvhe(__pkvm_host_wrprotect_guest, handle, mapping->= gfn, + mapping->nr_pages); if (WARN_ON(ret)) break; } @@ -381,7 +399,8 @@ int pkvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, = u64 addr, u64 size) =20 lockdep_assert_held(&kvm->mmu_lock); for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping) - __clean_dcache_guest_page(pfn_to_kaddr(mapping->pfn), PAGE_SIZE); + __clean_dcache_guest_page(pfn_to_kaddr(mapping->pfn), + PAGE_SIZE * mapping->nr_pages); =20 return 0; } @@ -396,7 +415,7 @@ bool pkvm_pgtable_stage2_test_clear_young(struct kvm_pg= table *pgt, u64 addr, u64 lockdep_assert_held(&kvm->mmu_lock); for_each_mapping_in_range_safe(pgt, addr, addr + size, mapping) young |=3D kvm_call_hyp_nvhe(__pkvm_host_test_clear_young_guest, handle,= mapping->gfn, - 1, mkold); + mapping->nr_pages, mkold); =20 return young; } --=20 2.49.0.1112.g889b7c5bd8-goog