From nobody Tue Feb 10 06:04:52 2026 Received: from mail-ed1-f74.google.com (mail-ed1-f74.google.com [209.85.208.74]) (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 8E98E20E003 for ; Mon, 16 Dec 2024 17:58:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734371920; cv=none; b=VNa3SQGKg80It3FW6MuzkHjennB6bcf1Dk34LEpYQ6AD+LRqI7rE3/rzh3QUTK0h1+mDqVX/PpKhUlFiDJI1X581XFHG3awJNCljBBuWtNIl/Nr304+SXh+nX5YqI+BXzaDLxfjd66OpjAkcJyIIXCOrdmOmhpaO+O4jtchR3Ek= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734371920; c=relaxed/simple; bh=rcoYPmb/53S8Gvor6OWXTcnIDC6gvecrrUk8ZXPefhA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YqvxQrVXYnNDSezV84rEk5PajGnR2yTO4icgs0/F+2BJ20MHoEiuA9uj68TYB1ZT+7Cpq1KE0aSi3RQuNiVrgnZneMjdADAfkrJBY1OkwE5VpSXEaXiuO+u+a8GoGTFcFQw3DOQ5eCpJ7KQXwbSHwKa+UTgsCMpHxGca3bKtIjo= 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=dnmgLIUZ; arc=none smtp.client-ip=209.85.208.74 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--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="dnmgLIUZ" Received: by mail-ed1-f74.google.com with SMTP id 4fb4d7f45d1cf-5d3e77fd3b3so5297636a12.0 for ; Mon, 16 Dec 2024 09:58:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1734371915; x=1734976715; 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=b5r7yCnkAiK5kyLrxO0D/txvshFXcnr6nZkeqCQZICw=; b=dnmgLIUZpfWnzUEbr0UdNv5wWtDRGwPsz5OODmJ2N6xXLeeRjBr27v7HTsDCEF8cbV 7O+OnN+zlJ0+1vMTJEJIkv4wPa3nMqLBzNasenGyQvOPk6SQViCw0pkD4X7wpzM49a/V mHOjnL6h/P4w2SL7EgzzVkEu0hPCQTqW1zBri+HpIoYxlZ7zuJay134yRKMTvaH/6O3n lB0N+6cDwKt+BVpp0V8maKGudynRI52KrIvnAbOPf3902SgClVpXZxRGmMQlB0I2Qmsh FJUEaSsDUggOTAf9Bn5sI9BLT2G11/piamYuRotFKoMq3Mz7LlMb6Tf+AdeCgiCjLKAV zwpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734371915; x=1734976715; 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=b5r7yCnkAiK5kyLrxO0D/txvshFXcnr6nZkeqCQZICw=; b=aPfqgo3oW/5De88Ch/Rq2WaNqrnZOeelHX/YpaWM43pRkJqek/YP+fB12p7SEx9Pd1 5vUMmE91wAq9FvPpAwRcMZy9L1MCfid8sXpu1k++gxnUg0rHLbrD8aBEeqOh5490AmZ0 vumZk+KJVtktefHBhc3ENKsowJF/F+04vBYbJLQV4WCTvAcwP3JRhOrpND3BbSUXDG5s lPMYOJjqyzOnt6yNEUxEJMwNSmYmROaGW/lee0USLxG0/MCNy6qW+W9rAhVc91necIzo 9aODM0jaFGiGqMvaEEQaobwSbCKPq/RZWPHSpqnm2y0YvYd38w8qpDsD0NFil7oqvjU5 9XYg== X-Forwarded-Encrypted: i=1; AJvYcCVXZMqTmhsoyqVJlppueBIWhjiUnDiEMgcOxkmmqYHn3z99nqYAd2A32o/9KoXtpxJkA0MJih5Xemma/v8=@vger.kernel.org X-Gm-Message-State: AOJu0YxjPSE99nESfz6T5IPb5H0DmNg7scchnIXfZaZuWUGEouza9s7J 4Qmk928XyKIfRuM/sdehOP/wKY5TZ+Ff/JwEeuBxG505D8NWIitGgM7EAveayc03MyJRwv8m7bx qns63tQ== X-Google-Smtp-Source: AGHT+IETu+O3p1iOBFO9EmhBHTULF9iIkYmes1FbMSi6hvoepqbMqPvqpSwnKmEI7JcKZIr1ZyErBddwlhp2 X-Received: from edbek12.prod.google.com ([2002:a05:6402:370c:b0:5d0:225b:ed39]) (user=qperret job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6402:4584:b0:5d4:5e4:1555 with SMTP id 4fb4d7f45d1cf-5d63c3200acmr13094867a12.19.1734371915059; Mon, 16 Dec 2024 09:58:35 -0800 (PST) Date: Mon, 16 Dec 2024 17:57:59 +0000 In-Reply-To: <20241216175803.2716565-1-qperret@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241216175803.2716565-1-qperret@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241216175803.2716565-15-qperret@google.com> Subject: [PATCH v3 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. Signed-off-by: Quentin Perret Reviewed-by: Fuad Tabba --- 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 fc9fdd5b0a52..b3aaad150b3e 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -43,6 +43,7 @@ int __pkvm_host_share_guest(u64 pfn, u64 gfn, struct pkvm= _hyp_vcpu *vcpu, enum k 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