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 8D6D34A2D for ; Wed, 2 Jul 2025 00:44:26 +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=1751417068; cv=none; b=nAG5kci/InM3bUjSc2RPJ8sMEXp/jvZReCLRmT190n+u67TYVmXlfYJyihWpsrolO/j39sGDij+DCBwFtvNH+I77BwK45BuhKZhsgP+qu1Z500QlPl7qEUnK7SUjh8t982ZOwkxAqkII//+2v78XkWN7AnquL/KLSoAty0/PLrs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751417068; c=relaxed/simple; bh=GMM9Xc4S93NZsBFQxZ/Narp+exl6rKh0KT3abCEuCg4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=X58M5iZLFNGm/LsXA2G08bQr2PBjF7UTA/on/HxMjspQU1Jfy+4OqLHIaL8stcLQkU61bNM1a4TdDKJjdq4Er1FpAe8C6Ft5mgHki4BC0ir+HJetObgqJHsBkSv0s7JymO9fD58IzLME/7YnjFVT7ujsU9MpApTBXG6NtWNH+Fc= 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=JWlQHYhm; 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="JWlQHYhm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1751417065; 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=WE68W0bXQaTpxl/iIASF1f+Xh1LT+vGRhkdJSNq736g=; b=JWlQHYhmNIADWjwlmqrAXB3rlavuGQXzFuKTfEESbej8eaf/PQlt31vC5i2c8BH2zf+jJ7 FiB8AQ/SDh1NAr5pHDd3OGukYbvi8+OgKeAo9I0zcTNwA2dEVUnZNwnFk5sfv1t1Y0zNmb BhObrJQ34prpbogWUzTUyBXlAZeIfNc= Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-111-pQp8qwrSOd262KDWcQGG1g-1; Tue, 01 Jul 2025 20:44:23 -0400 X-MC-Unique: pQp8qwrSOd262KDWcQGG1g-1 X-Mimecast-MFC-AGG-ID: pQp8qwrSOd262KDWcQGG1g_1751417062 Received: by mail-pl1-f199.google.com with SMTP id d9443c01a7336-235eefe6a8fso45382475ad.1 for ; Tue, 01 Jul 2025 17:44:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751417062; x=1752021862; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=WE68W0bXQaTpxl/iIASF1f+Xh1LT+vGRhkdJSNq736g=; b=bkTYeMXb6+YfriJ522X48YemONiKV0z4U+zEv3Ou5/1ZMD37E5hhVA28ppRE8+6BzS enNm1wvoqrQuVKj66zY1svwjvhIfZADN8zVGutdE6HaLRtDT1tNPFaILyCRTQW4QvRRc lcWvV2UZQub6unK4kpl0HsOTCBl1fZFWOGUgk4Yh2ORMDv3ke1gE+oRqN+srPpm8G/tB VGd3uXsWzrPEWo9pdCeZV+k8QMMSlKWgYwynXXs1XLShMroz71apN5YAsTkhw89mz+YE zOZEM+T/x3JtoXsBUCIGy6b+AcLUvoOK5h1xh2ghGH7AO5zI6hM1rIdm39N5ATsVRcaY vuqg== X-Forwarded-Encrypted: i=1; AJvYcCXqWcOn16RYr8u7f9TjqiJNAmB56WeKnrAnxS2bHmSBm8o+2FlD/ALEtXbMbnFASbutYj8=@vger.kernel.org X-Gm-Message-State: AOJu0YxK/qZMesK9MtK1gXx/9pigW/ZW0/lIEizqypTL3Xq2vLKow4cD ZY+wi1eH7U+9bFco3nYRq3wk96Kgd3ebDeS0OcSB4BPQ0Xxiaz8/Lnaod475M+JmXOzMen9kygZ DeENIVJ/NkAh08/mGFIKQpwhbIBi0NQ1XMG9ONGiNGoDGauzlM29SDA== X-Gm-Gg: ASbGncsIN7aXcw4TI/cIGunpdawuVsx+jaPkp/dPFFNL3RylhrK7zkVX3oaV+T1iTsU WgD+jHUm7NY+P67Ds53nc8bV38N+cnNUKKRlWLrVPVoWYVMSJ1u28Yp0LxO+2elbBOE8BAElRZG AcDnbCYQxRaja3PAKdJ6R22DS6g/BU5J+g4G7UJoVG/14GgyQi/M1BHn+6GuYx3V6BPZGRISimD 8iULEjzJcZY+LapUIuBhkX5JjxxdWqNEXag9zrcVDJrnseXyUZMEY58ZZDw0XloC2cTVdlpVw3J 8WtMqs3Oua7gZBcwn2azb1ZDFm7XyqQ4EzW5d3iK/GTDutD0LADG7QGmHK2lOQ== X-Received: by 2002:a17:902:f644:b0:234:ef42:5d75 with SMTP id d9443c01a7336-23c6e583731mr8506625ad.20.1751417062335; Tue, 01 Jul 2025 17:44:22 -0700 (PDT) X-Google-Smtp-Source: AGHT+IG8Xe02tQUQpMvQ7JmZ6r+aJbfGWHLqnMc6SvZ+9EXS76Rb9Lau8L3Ze+pH8UDez4MEnO2doA== X-Received: by 2002:a17:902:f644:b0:234:ef42:5d75 with SMTP id d9443c01a7336-23c6e583731mr8506155ad.20.1751417061963; Tue, 01 Jul 2025 17:44:21 -0700 (PDT) Received: from [192.168.68.51] (n175-34-62-5.mrk21.qld.optusnet.com.au. [175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23acb3b871csm114358215ad.187.2025.07.01.17.44.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Jul 2025 17:44:21 -0700 (PDT) Message-ID: <5eef96b4-2a33-4d52-a68a-323709beee5b@redhat.com> Date: Wed, 2 Jul 2025 10:44:12 +1000 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 17/43] arm64: RME: Handle RMI_EXIT_RIPAS_CHANGE To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki References: <20250611104844.245235-1-steven.price@arm.com> <20250611104844.245235-18-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250611104844.245235-18-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 6/11/25 8:48 PM, Steven Price wrote: > The guest can request that a region of it's protected address space is > switched between RIPAS_RAM and RIPAS_EMPTY (and back) using > RSI_IPA_STATE_SET. This causes a guest exit with the > RMI_EXIT_RIPAS_CHANGE code. We treat this as a request to convert a > protected region to unprotected (or back), exiting to the VMM to make > the necessary changes to the guest_memfd and memslot mappings. On the > next entry the RIPAS changes are committed by making RMI_RTT_SET_RIPAS > calls. > > The VMM may wish to reject the RIPAS change requested by the guest. For > now it can only do with by no longer scheduling the VCPU as we don't > currently have a usecase for returning that rejection to the guest, but > by postponing the RMI_RTT_SET_RIPAS changes to entry we leave the door > open for adding a new ioctl in the future for this purpose. > > Signed-off-by: Steven Price > --- > Changes since v8: > * Make use of ripas_change() from a previous patch to implement > realm_set_ipa_state(). > * Update exit.ripas_base after a RIPAS change so that, if instead of > entering the guest we exit to user space, we don't attempt to repeat > the RIPAS change (triggering an error from the RMM). > Changes since v7: > * Rework the loop in realm_set_ipa_state() to make it clear when the > 'next' output value of rmi_rtt_set_ripas() is used. > New patch for v7: The code was previously split awkwardly between two > other patches. > --- > arch/arm64/kvm/rme.c | 46 ++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 46 insertions(+) > Reviewed-by: Gavin Shan