From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (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 1F8911E5021 for ; Tue, 3 Dec 2024 10:38:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733222294; cv=none; b=NeMQUsTtUssA+ESbHFb3xln8FGJHJWrVyh+3FzOBxxhuTJ/9TrL4k/whRc81jdY9Lv0pxWubyv4xdW9RRsUXjJMGHWzGxzCTcwxkvd5xspJS6u5U1LTpeW6zZ9lt1+y8b3wj5U90LEEFz3gTZpfA0azbTRUQoYywGMPZAtfhcM0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733222294; c=relaxed/simple; bh=C7bckg4iK+Kx8bfAXOZsZZOVRcvYB+OWUiAnJRxcvxA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=m7e/MYTJa0hczzvBUcYfnsGQE/8h6UgtdoUqdiREAGieWwRwMmkLDPqEx8gkQ9APJdXrYlFTQJzoGlLU08kSvWk1Q7WaoyVCYyDQCU73n35ZXylM890Ev4A/S3hLmyBYUiFYROFVH+fHypyan1ueZnhVFxYmytqymZxVQvtxUws= 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=FqCi7kqo; arc=none smtp.client-ip=209.85.218.74 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="FqCi7kqo" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-aa543b13532so307758566b.3 for ; Tue, 03 Dec 2024 02:38:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1733222292; x=1733827092; 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=eYizfs5ugNIRCne9WipVM8NnIjcJOlVcRn/zTXEmfg0=; b=FqCi7kqolGHkqwv0LDYEM21bKw9bo4JB/b5U6aF1Xurcb3Psb+eVFJ1+Gd5fsCksVA 6daf0XB14/8j7VFhWO1/PM1n6komwj/FHsFLX008v+sqxphzTshBelHtmBoI6wiaYelM pxM6fvO69yjSDZzwiycBEmpUJ73MIJXlBoiQd0prtXFRHjuRDqcrKUCuk/xqhOA+/5DH dY8APX7vSZV5Zh65ydniKYZWNZUr6UTUZJUCpgrvmNJY/luHKRglW1B1pHWWc0P/bjyY 63nyeeP3TVrEEy9DFKY4rOQzRv07DiH1AP8px2xKn9x3b7CXnzL2mkZvhJPD/XXQCxpT 6YMw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733222292; x=1733827092; 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=eYizfs5ugNIRCne9WipVM8NnIjcJOlVcRn/zTXEmfg0=; b=f4Ts7ZP2sbe1jwae2RVACVkHZFqsdgVmIW6Sdp0oZEr1oVESNnpkU4WUofF5Qk/ZgM 3aN5y1iXzD9nfKJijKi3eQidXdR2tZerzcABIRrGmcsNoe6UFjXngqfL1goRt4BOACrD wDq71bwYCYh0vPxAFCDHVqgKQx3KD9hz/3kgRj9qjYB+/EQ06dS5EhlXBCgsb7iA1nwf ONfqPU73OMZ5+nYCNRv1U/45eqwg6BAo+0JpfWybqHI0bSMpOzOoyyTNv0ctvkUdDZBP 3LCSb/MbE996UXvDkuMN48kC5jevLQ2ffvvIcbSYw9iPbbWoZI+9nLQ7k1mq1O29H5Cc l1iA== X-Forwarded-Encrypted: i=1; AJvYcCVMY8t+E7w8AjJCq0u3eOgrVRR7s6bHBIwDrqn38WOOlv4nOQEAcYuvYky1N2T7aYXs9lCLT5iHyncnukg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw/u5HAxdVOCY5CathmUKuuoXHlmI1d7PawtFWpZlE+lE9erq/0 4PRu8bBxm7U6iWozQVAA/flO1rG7EygDeIsZ79gPmhmgkzQ26n6teXuhiVK+UvlfbGEWyAut1c7 ukRi8vw== X-Google-Smtp-Source: AGHT+IHy5ejf0OiCrkEdWE2fH7ml0DEW+PK/xc+o7UbY9Xx9O7ZNOT6ubaPhP/xD9o/HpxIVzCb6WRgnDi57 X-Received: from edix21.prod.google.com ([2002:a50:d615:0:b0:5d0:a9a6:5abc]) (user=qperret job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:7703:b0:aa5:1a75:dcd9 with SMTP id a640c23a62f3a-aa5f7f1ad71mr161678366b.48.1733222291421; Tue, 03 Dec 2024 02:38:11 -0800 (PST) Date: Tue, 3 Dec 2024 10:37:33 +0000 In-Reply-To: <20241203103735.2267589-1-qperret@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241203103735.2267589-1-qperret@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241203103735.2267589-17-qperret@google.com> Subject: [PATCH v2 16/18] KVM: arm64: Introduce __pkvm_tlb_flush_vmid() 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-Type: text/plain; charset="UTF-8" Introduce a new hypercall to flush the TLBs of non-protected guests. The host kernel will be responsible for issuing this hypercall after changing stage-2 permissions using the __pkvm_host_relax_guest_perms() or __pkvm_host_wrprotect_guest() paths. This is left under the host's responsibility for performance reasons. Note however that the TLB maintenance for all *unmap* operations still remains entirely under the hypervisor's responsibility for security reasons -- an unmapped page may be donated to another entity, so a stale TLB entry could be used to leak private data. Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/kvm/hyp/nvhe/hyp-main.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 6178e12a0dbc..df6237d0459c 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -87,6 +87,7 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___pkvm_teardown_vm, __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_load, __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_put, + __KVM_HOST_SMCCC_FUNC___pkvm_tlb_flush_vmid, }; #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index de0012a75827..219d7fb850ec 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -398,6 +398,22 @@ static void handle___kvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt) __kvm_tlb_flush_vmid(kern_hyp_va(mmu)); } +static void handle___pkvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1); + struct pkvm_hyp_vm *hyp_vm; + + if (!is_protected_kvm_enabled()) + return; + + hyp_vm = get_pkvm_hyp_vm(handle); + if (!hyp_vm) + return; + + __kvm_tlb_flush_vmid(&hyp_vm->kvm.arch.mmu); + put_pkvm_hyp_vm(hyp_vm); +} + static void handle___kvm_flush_cpu_context(struct kvm_cpu_context *host_ctxt) { DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1); @@ -582,6 +598,7 @@ static const hcall_t host_hcall[] = { HANDLE_FUNC(__pkvm_teardown_vm), HANDLE_FUNC(__pkvm_vcpu_load), HANDLE_FUNC(__pkvm_vcpu_put), + HANDLE_FUNC(__pkvm_tlb_flush_vmid), }; static void handle_host_hcall(struct kvm_cpu_context *host_ctxt) -- 2.47.0.338.g60cca15819-goog