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X-CSE-ConnectionGUID: IsheSp0mRKSU0BPX2f5SeA== X-CSE-MsgGUID: 1KW72Z+DT4yjcSpdc1a2SQ== X-IronPort-AV: E=McAfee;i="6800,10657,11549"; a="77396684" X-IronPort-AV: E=Sophos;i="6.18,257,1751266800"; d="scan'208";a="77396684" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Sep 2025 08:20:39 -0700 X-CSE-ConnectionGUID: rhUrhgsvRLa8qnQw3ImDGw== X-CSE-MsgGUID: osw0e5ryTSSfmkIYfw+ORQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,257,1751266800"; d="scan'208";a="178031712" Received: from gabaabhi-mobl2.amr.corp.intel.com (HELO [10.125.111.4]) ([10.125.111.4]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Sep 2025 08:20:39 -0700 Message-ID: Date: Thu, 11 Sep 2025 08:20:38 -0700 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: [RFC PATCH v1 0/5] x86/boot, KVM: Move VMXON/VMXOFF handling from KVM to CPU lifecycle To: Sean Christopherson , "Xin Li (Intel)" Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-pm@vger.kernel.org, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, pavel@kernel.org, brgerst@gmail.com, david.kaplan@amd.com, peterz@infradead.org, andrew.cooper3@citrix.com, kprateek.nayak@amd.com, arjan@linux.intel.com, chao.gao@intel.com, rick.p.edgecombe@intel.com, dan.j.williams@intel.com References: <20250909182828.1542362-1-xin@zytor.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/11/25 07:20, Sean Christopherson wrote: > VPID and ASID allocation need to be managed system-wide, otherwise > running KVM alongside another hypervisor-like entity will result in > data corruption due to shared TLB state. What other hypervisor-like entities are out there? The TDX module needs (or will need) VMXON for some things that aren't strictly for virtualization. But what other entities are out there?