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X-IronPort-AV: E=McAfee;i="6500,9779,10621"; a="395829783" X-IronPort-AV: E=Sophos;i="5.97,297,1669104000"; d="scan'208";a="395829783" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2023 09:27:44 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10621"; a="701703536" X-IronPort-AV: E=Sophos;i="5.97,297,1669104000"; d="scan'208";a="701703536" Received: from jklechel-mobl1.amr.corp.intel.com (HELO [10.212.244.208]) ([10.212.244.208]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2023 09:27:44 -0800 Message-ID: <5f29c397-d723-a18e-e0f0-660f9f22d998@intel.com> Date: Tue, 14 Feb 2023 09:27:44 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1 Subject: Re: [PATCH v9 05/18] x86/virt/tdx: Add SEAMCALL infrastructure Content-Language: en-US To: "Huang, Kai" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" Cc: "Luck, Tony" , "david@redhat.com" , "bagasdotme@gmail.com" , "ak@linux.intel.com" , "Wysocki, Rafael J" , "kirill.shutemov@linux.intel.com" , "Chatre, Reinette" , "Christopherson,, Sean" , "pbonzini@redhat.com" , "tglx@linutronix.de" , "Yamahata, Isaku" , "linux-mm@kvack.org" , "Shahar, Sagi" , "peterz@infradead.org" , "imammedo@redhat.com" , "Gao, Chao" , "Brown, Len" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "Huang, Ying" , "Williams, Dan J" References: <37d5736e-93b1-aed1-c21c-07fe1044f2d0@intel.com> <16470ac19325d99947bad3d4b16f6982b0facafc.camel@intel.com> From: Dave Hansen In-Reply-To: <16470ac19325d99947bad3d4b16f6982b0facafc.camel@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 8FA7E40003 X-Stat-Signature: rhhuhqrhjnw4537ys7yzajfm1p7jm58h X-Rspam-User: X-HE-Tag: 1676395666-851632 X-HE-Meta: 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 MGrjW07n HWgQc2cMh2vZPIX/aXT7bhpudjO1tfGN8MN9H2Pgay+TDmVUElXjo+m2QBMMsVmNz0EBuuMKa5+PF/13RC6zPBQzxQ8pWryOQS9snJMuvqg9L8Gu+ahY1TOg/6jEjRET1f9f34lCjeAuBk/DJnJvqihWRwrsocyX6LvOxf9g6JnOYGaHFdydxX6Pd97uH6wplWHn5EVBRKwr9fQU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2/14/23 00:57, Huang, Kai wrote: > Consider this case: > > 1) KVM does VMXON for all online cpus (a VM created) > 2) Another kernel component is calling tdx_enable() > 3) KVM does VMXOFF for all online cpus (last VM is destroyed) Doctor, it hurts when I... Then let's just call tdx_enable() from other kernel components. Kai, I'm worried that this is, again, making things more complicated than they have to be.