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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49981b1bd61sm67203035e9.8.2026.08.13.07.51.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Aug 2026 07:51:40 -0700 (PDT) Message-ID: Date: Thu, 13 Aug 2026 16:51:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PULL 00/10] Next patches To: Richard Henderson , Peter Xu Cc: qemu-devel@nongnu.org, Paolo Bonzini , Fabiano Rosas References: <20260812151444.2611689-1-peterx@redhat.com> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: mYT1A319wojYOo03SRdPT9aJw1ZCS3I0 X-Authority-Analysis: v=2.4 cv=M7J97Sws c=1 sm=1 tr=0 ts=6a7dd9fe cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=4s3hRJSeHn4rkQlkrse1kQ==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=Vs8K37Lm-pY0MMZWHV4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODEzMDEwNiBTYWx0ZWRfXxrjMQ6J/2356 QaA6lxcExZus98N7TaWxu6FgaPspQdUtppPI9ngCbola+LXybe8KTD0rkVAXZSLj+PbIIpDHFbR DMP/CJnxuG5KbVfojDqVUt0b2pRgGaU= X-Proofpoint-ORIG-GUID: mYT1A319wojYOo03SRdPT9aJw1ZCS3I0 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODEzMDEwNiBTYWx0ZWRfX3EwNVGIVPk2e th9ihW3jJ4NWwy93X52xovOP3P2EkpCo2HA3lvmqiNiGyirzF07w20KskNhhK7D89w5YhMIx1Wt 8u0CngCN2BkxjnNHa+CLRlWgJaqQR3fnRqilp4IoU5HLwUfAoJZIs9KENAG7W3C/7mjAkooUmlB 5/z7N0m1fyZcoE+PkWd0qskN6HBz8LEVEG4KjiopXRlEI6EdDjRFrEoELQkBSlqXFZO2udyQTiY S8N2tXXBRtwcDrw6aFvfXo5Rr1vDjNwYvD9cAuKKlJF8eEFP9Z0KPQUTf++LqhX2SBR7RMw0U+J PDPruZNVH/bCl3+piwTak/7onxYoijxLn6NGirM7X+pE5BnxRec/LRQjrdMIS9xfXCFhfvle+1D ZkvLV7yepxB+VYQDMmIpTfva6MtHubi613yD1kQ0bg7Wvk06SDEjeCcZzoMv/H0Cxul5UEhk04X tJk9vBcQ01uwMiphsug== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-13_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608130106 Received-SPF: pass client-ip=205.220.180.131; envelope-from=philmd@oss.qualcomm.com; helo=mx0b-0031df01.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 13/8/26 16:14, Richard Henderson wrote: > On 8/13/26 06:41, Peter Xu wrote: >> Now when I think about it from the root, I tend to like what Xen defines >> with ram_addr_t: >> >> /* address in the RAM (different from a physical address) */ >> #if defined(CONFIG_XEN_BACKEND) >> typedef uint64_t ram_addr_t; >> #  define RAM_ADDR_MAX UINT64_MAX >> #  define RAM_ADDR_FMT "%" PRIx64 >> #else >> typedef uintptr_t ram_addr_t; >> #  define RAM_ADDR_MAX UINTPTR_MAX >> #  define RAM_ADDR_FMT "%" PRIxPTR >> #endif >> >> I don't know how we supported 32bit host emulating anything larger, but >> logically it's doable, then IIUC uintptr_t won't be enough allocating >> anything >4G? > > ram_addr_t != hwaddr or vaddr -- it's just an internal token. > > So a 32-bit machine could put 1G of ram (identified by ram_addr_t) at 8G > (hwaddr) just fine.  But obviously it couldn't put 8G of ram anywhere.  :-) > > That said, Xen was weird in that it used to be possible to have an i386 > qemu command-line talking to a x86_64 dom0 kernel controlling x86_64 > guests. > > So, yeah, now we should drop this ram_addr_t distinction and always use > uint64_t. 🩷🩷🩷 lovely 🩷🩷🩷