From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C0F801C5F27 for ; Tue, 6 Oct 2026 03:18:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791256738; cv=none; b=ERx8izdHWZMDqiVBigMK3ZQYvJTYJ5SLS8MnVYoLiiMsZC9X5hh93do03v3K7QAEh5xHIE8AsTnF/H8j2jdJuq5k5y0W1fz7xHyF71fg4o6CVlsTYm+wYum3nmfHJVJ7SXljyZG1k1tVfd8jX9NAgwqgEDcyM2HVNAdcXTCPGYY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791256738; c=relaxed/simple; bh=ZVbjw66CG6A5xcmMat7LXv1MIDZBEKIeNvSdl57psXU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=JrTKrFf4DOvSDNyhJ8pyqYj83mEZKQR7Gv5eBLzsLwY4dN3RPZvxz8JBCVNE+9EcMNOIspGUvOkpP7kj1xBpuI3k3OmdyxoLwYgJzc01hfs73/qWbC6fOt9pcFjgQV3Eun8oyEk7q6O0pbE3qN6/rnYxSQAfwSd1ft6Lp4QBccs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=hm9nEvHL; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hm9nEvHL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1791256735; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1jMiWdjITXmdV/ikrHHf6jmvGBH/AsJXpXasV0+qQL8=; b=hm9nEvHLnYSPXfDzpndbnS+8qfFq0JSqamB/V1S6aXkuZUPwsSAJ8D3D2Ss8qWkUJXjo6Y Qm0DN0vUy1gaHBugdWe4fsSUDPCojs2rt/Eza5jMdpniM/wXgfFUZd5Ukghs66MsHFnnMH 1GqxKcH0IAt3bz79LLZngKHckQwULl0= Received: from mail-pl1-f198.google.com (mail-pl1-f198.google.com [209.85.214.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-201-ej7J__DINum_YOfOSyiobg-1; Mon, 05 Oct 2026 23:18:54 -0400 X-MC-Unique: ej7J__DINum_YOfOSyiobg-1 X-Mimecast-MFC-AGG-ID: ej7J__DINum_YOfOSyiobg_1791256733 Received: by mail-pl1-f198.google.com with SMTP id d9443c01a7336-2cec4226c70so22604595ad.1 for ; Mon, 05 Oct 2026 20:18:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791256733; x=1791861533; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=1jMiWdjITXmdV/ikrHHf6jmvGBH/AsJXpXasV0+qQL8=; b=e4K9cG5MrepVvK5EzlzOIoKUiymMjy840gIcJpV0+OKThbcrvfyO221AxX4d+LKZ4o n3ATc3WEbgz/YpYHtpNogMIrIkb58+PqPDuAbirZfaCLHdZi7qTK9rg3zWfZPrX3X8Rq 83JgopmReakInRATGmZUga7hy4p3dHlhNrBNP3bdg/4d/rTcTgX0nISD/N7dW8RaWOIF FquBqc7uoQjthdLY0PpgCZQtSiw+8GHGOdKwGT5SF5OHhjoc/0Foi7iMjtPCFOQx4UD9 rkAVYcqSzFIJijpNOQ1t0n1qplw2FpsoHKRGiHFrTtTpReRVWVZGorjeQpUnXGm6Ek6S lTbA== X-Forwarded-Encrypted: i=1; AKwUvBxIp+UJasJZJsLVOgKQUFOQ+3PK5IWNB3pSxf9Q6ZJ07c5xpa/PW745qHqlVTmEQgv3XgyhsUw0Mg5d@lists.linux.dev X-Gm-Message-State: AFq9FYIxDQkWuPJup1x24KM0mqIwIbkh9vSu/Lpt/TN5utuWWRGHWd+J SK54ecqVDBp8LErw8nzHu93tyv8fGAxITP5x+o+hUniG22A9lSv3yxRl4rBhzWuHNeUwjUFhJ8p ugn8BNBna1GrKQknA9W/ZGbjrvGGulp9yMEqCmPsqikQhd8mS2lI0oLQYoaxW/cM= X-Gm-Gg: AYBFou1Vo1XLOKLpydC+5h+2AlHOmI4SwsCHmrVWXAFa9q1+apqtFsm2BefMDGYRm9Z znmNycHSC/wWJScYiMmTSkBIyeBlTJRCvwf67IkVNiV+dbjNHr9nJd+ue7Wq6WbfsbP+E2f6UJ8 Fh4GUSPpfZ9brbxVgysaNj18MNdleFwLf2ljG0tTv5rWeJ5eyeUI+kcyXWukpyUfgw88uJtqcnG sfeaWEXkU78ZOLmPHMJ+dCggT20uUAP4J+ex26QuGwasxwMjF2C/mMdP6yF07JkSiJQhVf0QDfd xn5rgCOopTS6MM20geYsQLnNVQvyO7t/GNMmh3iW4M0+CTLUtjyCdbba5pDM2zLKqBHF0DlrC2B kFc4DvefBCvAHNCZcmcUlNXD8Vhdeajn0GTsuZ6wJ/g== X-Received: by 2002:a17:902:c952:b0:2e2:dc54:3148 with SMTP id d9443c01a7336-2e5dcdbe031mr1348485ad.66.1791256733326; Mon, 05 Oct 2026 20:18:53 -0700 (PDT) X-Received: by 2002:a17:902:c952:b0:2e2:dc54:3148 with SMTP id d9443c01a7336-2e5dcdbe031mr1348145ad.66.1791256732898; Mon, 05 Oct 2026 20:18:52 -0700 (PDT) Received: from [192.168.68.52] (n175-34-8-244.mrk21.qld.optusnet.com.au. [175.34.8.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e5a5ecf461sm15865645ad.53.2026.10.05.20.18.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Oct 2026 20:18:51 -0700 (PDT) Message-ID: Date: Tue, 6 Oct 2026 13:18:42 +1000 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v22 17/23] KVM: arm64: CCA: Add bare minimal S2 operations for Realm To: Suzuki K Poulose , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com References: <20261005090754.2140522-1-suzuki.poulose@arm.com> <20261005090754.2140522-18-suzuki.poulose@arm.com> From: Gavin Shan In-Reply-To: <20261005090754.2140522-18-suzuki.poulose@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: ZuKQsGpuYnT6G3i-CsIatbHJUvSUQ_AQj2rSuRtX-hI_1791256733 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/5/26 7:07 PM, Suzuki K Poulose wrote: > Add bare minimal MMU operation hooks for Realms. The mem_abort handling > is chosen as the default KVM variant. However this cannot be reached for > Realms yet and we would need real RMI command support to make it fully > functional. Similarly, unmapping stage2 requires RMI command support. > Until then reuse follow protected pKVM hook and ignore unmapping. > This will be addressed in the later series. > > RMM takes care of the TLB flushing as required, when the Stage2 is > modified. So host doesn't need to do anything explicitly. RMM doesn't > support access flags for the stage2, even for the shared IPA. > > Signed-off-by: Suzuki K Poulose > --- > Changes since v21: > - Reuse no_age_gfn for Realms. Also use no_stage2_unmap_range for > now, until we get proper RMI backed driver. > --- > arch/arm64/kvm/mmu.c | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > Reviewed-by: Gavin Shan