From nobody Fri Dec 19 04:53:42 2025 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 D25981FECA5 for ; Wed, 18 Dec 2024 19:41:34 +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=1734550896; cv=none; b=mJ4XwvvehURg2YhESdk54LTCPotNgKJwHP9naFVIJEEAtIwYcDldQxUssllFeADtJTw2mlfustkYaRuTln1t9NuJf+fBPphIP/q96/sHtrJAziFowc8FpJ+dhMtJmdqSc+5RLzCt4pycC1yEF0wRCJehcGHwBA7wjBNLk8ExnxA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734550896; c=relaxed/simple; bh=0O0/9IxU6uN7FbHeQC6ErZUTjaSrbyp8oeoxx5FdXI0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=AH2MkcIs8Oy/Ena6NCAaitoz+LC+q6WP7trAZ0Si4UwDYbfZ59C7Ks2an26OYcW/XvnJHVS8ianHZlXbFd8pu9GBOGFjD9/e/j8WY9tGJmBjVS2WfGj+mejLjZiCm+fGjuK4B7Y0VtacgtAoVZYyXuWqAlynCwon0qnuxw7NFUk= 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=jPt4kz8D; 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="jPt4kz8D" Received: by mail-ej1-f73.google.com with SMTP id a640c23a62f3a-aa6a831f93cso723256166b.1 for ; Wed, 18 Dec 2024 11:41:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1734550893; x=1735155693; 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=FA16CpWSjw4J8hytyuNewMCyl42cawlROSmZZIo9OEU=; b=jPt4kz8DGpDbajTwnntoz/oyVOlexXmzlSPwjE5cIYyAjMs8jPhS1XRvrv5KyGdWUb vnJkFEPXhchVIZRtNYLKYvQxYFnsSjlWsgTlrSy4wWm7nj7VwYRyVP7SgKiGzHWBUrQu ueLogzxX41OG+7Iq5SvfsMFjQI6lzOx9kYLNnImAjFynrBB5U8nRXI8broC/yv2pir91 efYs/UyDIBmIX5ve1xi0GVQ7MxtUzyMYlYGKlhytf5qf85gXl4uRe+g5zZqZ71tha7sp hsP+y5oMq7/dv3+PKsmYVse6ENYW002d9SCmIu1KcDGJJ8myQdgmtTGlWLaWCvi6OIBf TPuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734550893; x=1735155693; 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=FA16CpWSjw4J8hytyuNewMCyl42cawlROSmZZIo9OEU=; b=Ajyh56SGoOITaU92ES1ag99my5DyL+m9MMWpkxdxhTVu1+0tGIwzkfanGtJFMycAVb 6xgRPek3NAhoZrV81IqZSFphk7mZ0CdT575EnDc8EZNkeBlk9K6MU9g5XXuBjQxNlnis u9c5GuznoSy/eqQswPPUnXX04/WynoBBpJYp7j7hWNy5W4Y6mDx/rhFvJ+s7458LAevP 53Xmx4hH1C2JYrOZ/pV0KPuLzdxC46S7L8OWg8pkl/Kylhl7tUdLYLl6DjcqvZX+YOpe o3nfUVXghrwKIqxOtQZYEoL399XixafRzd6E/IO7Ma89Vf/1zng9sgalZDT8YcAyTM0n 8q8g== X-Forwarded-Encrypted: i=1; AJvYcCVNXwqR5fl5lJdjP3nwKnQuHHlkmBtUmdSSJsFRJ1LIQJYa3S1rhUOt3lKXmkmIQjYrbWGMojiE9g6+aBc=@vger.kernel.org X-Gm-Message-State: AOJu0YzOMUhwWHada7iFb3Tz/NNj4kq9nYX/UseCH/VPTlo7b6IBIL1T GHBg9KmlUV3S2/hR8BCTIQz0z1qPFnfdeOoD+xLS3HeLT/HjxNnJOdUu8mUNdswOFLDYcu/4FyR WTgGccQ== X-Google-Smtp-Source: AGHT+IG8EXE2W+9QfjAAeb4en8etMIJHTOmKwloyUtafN8OWJRimmwomZbfFp5X5CMVOuBoShjXizcAXD0pD X-Received: from edbfi23.prod.google.com ([2002:a05:6402:5517:b0:5d4:8b0:1df0]) (user=qperret job=prod-delivery.src-stubby-dispatcher) by 2002:a17:906:3297:b0:aa6:66bc:8788 with SMTP id a640c23a62f3a-aabf48cf088mr348264866b.45.1734550893196; Wed, 18 Dec 2024 11:41:33 -0800 (PST) Date: Wed, 18 Dec 2024 19:40:55 +0000 In-Reply-To: <20241218194059.3670226-1-qperret@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241218194059.3670226-1-qperret@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241218194059.3670226-15-qperret@google.com> Subject: [PATCH v4 14/18] KVM: arm64: Introduce __pkvm_host_test_clear_young_guest() From: Quentin Perret To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon Cc: Fuad Tabba , Vincent Donnefort , Sebastian Ene , 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" Plumb the kvm_stage2_test_clear_young() callback into pKVM for non-protected guest. It will be later be called from MMU notifiers. Tested-by: Fuad Tabba Reviewed-by: Fuad Tabba Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 1 + arch/arm64/kvm/hyp/nvhe/hyp-main.c | 22 +++++++++++++++++++ arch/arm64/kvm/hyp/nvhe/mem_protect.c | 19 ++++++++++++++++ 4 files changed, 43 insertions(+) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_= asm.h index 8663a588cf34..4f97155d6323 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -69,6 +69,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_guest, __KVM_HOST_SMCCC_FUNC___pkvm_host_relax_perms_guest, __KVM_HOST_SMCCC_FUNC___pkvm_host_wrprotect_guest, + __KVM_HOST_SMCCC_FUNC___pkvm_host_test_clear_young_guest, __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc, __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run, __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context, diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm= /hyp/include/nvhe/mem_protect.h index 0bbfb0e1734c..74bd6c72fff2 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -44,6 +44,7 @@ int __pkvm_host_share_guest(u64 pfn, u64 gfn, struct pkvm= _hyp_vcpu *vcpu, int __pkvm_host_unshare_guest(u64 gfn, struct pkvm_hyp_vm *hyp_vm); int __pkvm_host_relax_perms_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu, enu= m kvm_pgtable_prot prot); int __pkvm_host_wrprotect_guest(u64 gfn, struct pkvm_hyp_vm *hyp_vm); +int __pkvm_host_test_clear_young_guest(u64 gfn, bool mkold, struct pkvm_hy= p_vm *vm); =20 bool addr_is_memory(phys_addr_t phys); int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_= prot prot); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index 98d317735107..616e172a9c48 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -303,6 +303,27 @@ static void handle___pkvm_host_wrprotect_guest(struct = kvm_cpu_context *host_ctxt cpu_reg(host_ctxt, 1) =3D ret; } =20 +static void handle___pkvm_host_test_clear_young_guest(struct kvm_cpu_conte= xt *host_ctxt) +{ + DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1); + DECLARE_REG(u64, gfn, host_ctxt, 2); + DECLARE_REG(bool, mkold, host_ctxt, 3); + struct pkvm_hyp_vm *hyp_vm; + int ret =3D -EINVAL; + + if (!is_protected_kvm_enabled()) + goto out; + + hyp_vm =3D get_np_pkvm_hyp_vm(handle); + if (!hyp_vm) + goto out; + + ret =3D __pkvm_host_test_clear_young_guest(gfn, mkold, hyp_vm); + put_pkvm_hyp_vm(hyp_vm); +out: + cpu_reg(host_ctxt, 1) =3D ret; +} + static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt) { DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1); @@ -516,6 +537,7 @@ static const hcall_t host_hcall[] =3D { HANDLE_FUNC(__pkvm_host_unshare_guest), HANDLE_FUNC(__pkvm_host_relax_perms_guest), HANDLE_FUNC(__pkvm_host_wrprotect_guest), + HANDLE_FUNC(__pkvm_host_test_clear_young_guest), HANDLE_FUNC(__kvm_adjust_pc), HANDLE_FUNC(__kvm_vcpu_run), HANDLE_FUNC(__kvm_flush_vm_context), diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvh= e/mem_protect.c index 94e4251b5077..0e42c3baaf4b 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -1530,3 +1530,22 @@ int __pkvm_host_wrprotect_guest(u64 gfn, struct pkvm= _hyp_vm *vm) =20 return ret; } + +int __pkvm_host_test_clear_young_guest(u64 gfn, bool mkold, struct pkvm_hy= p_vm *vm) +{ + u64 ipa =3D hyp_pfn_to_phys(gfn); + u64 phys; + int ret; + + host_lock_component(); + guest_lock_component(vm); + + ret =3D __check_host_shared_guest(vm, &phys, ipa); + if (!ret) + ret =3D kvm_pgtable_stage2_test_clear_young(&vm->pgt, ipa, PAGE_SIZE, mk= old); + + guest_unlock_component(vm); + host_unlock_component(); + + return ret; +} --=20 2.47.1.613.gc27f4b7a9f-goog