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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DS3PEPF0000C380.mail.protection.outlook.com (10.167.23.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8769.18 via Frontend Transport; Tue, 27 May 2025 17:52:15 +0000 Received: from [10.23.192.59] (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 27 May 2025 12:52:14 -0500 Message-ID: <8dee65f4-24eb-4f33-ac85-59e1101c8a83@amd.com> Date: Tue, 27 May 2025 10:52:13 -0700 Precedence: bulk X-Mailing-List: coconut-svsm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Alternate Injection related questions From: "Melody (Huibo) Wang" To: Jon Lange , "Lendacky, Thomas" , =?UTF-8?B?SsO2cmcgUsO2ZGVs?= , References: Content-Language: en-US In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2025 17:52:15.3796 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f5843b61-dbee-420f-d38d-08dd9d47376c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF0000C380.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PR12MB9435 Sorry for re-sending this since I had the wrong mailing list in the previous one. On 5/27/2025 10:39 AM, Melody (Huibo) Wang wrote: > Hi Folks, > > I have a few questions, can you please help? > > I found that when an #HV arrives when interrupts are disabled in the SVSM, the #HV handler will postpone the #HV, but the postponing simply returns. > > Who should re-inject this #HV again? > > postpone_hv: > // HV gets postponed > popq %rcx > popq %rbx > popq %rax > addq $8, %rsp > iretq > > Is the hypervisor supposed to re-inject the #HV hoping that interrupts will be enabled? > > How is the hypervisor supposed to know whether a #HV which was postponed, was actually handled so that it doesn't inject it again? > > In SVSM code now, the SVSM will read the doorbell page for extended interrupt information without checking even there is a #HV coming in. Why are we doing this? I think this needs to be triggered by a #HV handler instead of reading the doorbell page automatically. Right? > > I have one more question about gdb tool, "https://coconut-svsm.github.io/svsm/installation/INSTALL/#debugging-using-gdb". I tried to use the tool, but it does not work, I have enabled it : > > "kernel": { > "svsm": { > "features": "enable-gdb", > But not able to make it work. This is the log: > > $ sudo gdb --ex "target extended-remote /dev/pts/4" > GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git > Copyright (C) 2024 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. > Type "show copying" and "show warranty" for details. > This GDB was configured as "x86_64-linux-gnu". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > . > Find the GDB manual and other documentation resources online at: > . > > For help, type "help". > Type "apropos word" to search for commands related to "word". > Remote debugging using /dev/pts/4 > Ignoring packet error, continuing... > warning: unrecognized item "timeout" in "qSupported" response > Ignoring packet error, continuing... > Ignoring packet error, continuing... > Remote replied unexpectedly to 'vMustReplyEmpty': timeout > (gdb) quit > > > Thanks, > Melody >