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X-CSE-ConnectionGUID: OgQbpIrcRaWMvy8ldUoiOw== X-CSE-MsgGUID: HR5h5fW/QQu9V8P9aLjvUg== X-IronPort-AV: E=McAfee;i="6800,10657,11647"; a="71759876" X-IronPort-AV: E=Sophos;i="6.21,161,1763452800"; d="scan'208";a="71759876" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2025 09:30:23 -0800 X-CSE-ConnectionGUID: fbHrmORNQQyj5SR2FBDohA== X-CSE-MsgGUID: MpRsZuLNTMGgDY4dfxuwOQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,161,1763452800"; d="scan'208";a="198171291" Received: from schen9-mobl4.amr.corp.intel.com (HELO [10.125.111.100]) ([10.125.111.100]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2025 09:30:22 -0800 Message-ID: <6a5dd3e0-672c-4be3-a1c7-26fe3db17d00@intel.com> Date: Fri, 19 Dec 2025 09:30:22 -0800 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] KVM: x86: Extract VMXON and EFER.SVME enablement to kernel To: Sean Christopherson , Xu Yilun Cc: Chao Gao , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , Paolo Bonzini , linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, Dan Williams References: <20251206011054.494190-1-seanjc@google.com> <20251206011054.494190-3-seanjc@google.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 12/19/25 07:40, Sean Christopherson wrote: > Is there any **need** for tdx_cpu_enable() and try_init_module_global() to run > with IRQs disabled? AFAICT, the lockdep_assert_irqs_disabled() checks added by > commit 6162b310bc21 ("x86/virt/tdx: Add skeleton to enable TDX on demand") were > purely because, _when the code was written_, KVM enabled virtualization via IPI > function calls. Yeah, the intent was to prevent "rmmod kvm_intel" from running while TDX was being initialized. The way it ended up, though, I think TDX init would have been called in a KVM path _anyway_, which makes this double useless.