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From: "Kuppuswamy, Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Juergen Gross <jgross@suse.com>, Deep Shah <sdeep@vmware.com>,
	VMware Inc <pv-drivers@vmware.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Peter H Anvin <hpa@zytor.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Andi Kleen <ak@linux.intel.com>,
	Kirill Shutemov <kirill.shutemov@linux.intel.com>,
	Sean Christopherson <seanjc@google.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 03/11] x86/cpufeatures: Add TDX Guest CPU feature
Date: Tue, 5 Oct 2021 21:33:35 -0700	[thread overview]
Message-ID: <f15d1b41-e4fb-0203-88f7-dbac3f4e5307@linux.intel.com> (raw)
In-Reply-To: <20211006034218.ynamwigsvpgad7sr@treble>



On 10/5/21 8:42 PM, Josh Poimboeuf wrote:
>> is_tdx_guest was mainly introduced to support cc_platform_has()
>> API in early boot calls (similar to sme_me_mask in AMD code).
>> Regarding FEATURE flag it will be useful for userspace tools to
>> check the TDX feature support.
> FEATURE flags can also be checked in the kernel, with boot_cpu_has().
> Or am I missing something?

Yes, previously we have been using x86_feature_enabled() check in
cc_platform_has() call. Now with the introduction of is_tdx_guest
global variable, we don't use it in kernel. But I still want to
keep the feature flag for user space use case.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

  reply	other threads:[~2021-10-06  4:33 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05  2:51 [PATCH v8 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-10-05  2:51 ` [PATCH v8 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-10-05 20:13   ` Josh Poimboeuf
2021-10-05  2:51 ` [PATCH v8 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-10-05  4:53   ` Randy Dunlap
2021-10-05 13:29     ` Sathyanarayanan Kuppuswamy Natarajan
2021-10-05 14:09       ` Dave Hansen
2021-10-05 14:31         ` Sean Christopherson
2021-10-05 14:43         ` Kuppuswamy, Sathyanarayanan
2021-10-05 14:13       ` Borislav Petkov
2021-10-05 14:48         ` Kuppuswamy, Sathyanarayanan
2021-10-05 17:29           ` Borislav Petkov
2021-10-05 20:21             ` Josh Poimboeuf
2021-10-05 20:38               ` Kuppuswamy, Sathyanarayanan
2021-10-05 20:17   ` Josh Poimboeuf
2021-10-05 20:33     ` Sean Christopherson
2021-10-05 20:42       ` Dave Hansen
2021-10-05 20:37     ` Kuppuswamy, Sathyanarayanan
2021-10-05  2:51 ` [PATCH v8 03/11] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-10-05 21:04   ` Josh Poimboeuf
2021-10-05 21:19     ` Borislav Petkov
2021-10-05 21:41     ` Kuppuswamy, Sathyanarayanan
2021-10-06  3:42       ` Josh Poimboeuf
2021-10-06  4:33         ` Kuppuswamy, Sathyanarayanan [this message]
2021-10-06  5:03           ` Josh Poimboeuf
2021-10-06 12:47             ` Borislav Petkov
2021-10-06 14:11               ` Josh Poimboeuf
2021-10-06 14:26                 ` Borislav Petkov
2021-10-06 14:25   ` Josh Poimboeuf
2021-10-06 15:26   ` Borislav Petkov
2021-10-06 15:43     ` Kuppuswamy, Sathyanarayanan
2021-10-06 16:20       ` Borislav Petkov
2021-10-05  2:51 ` [PATCH v8 04/11] x86/tdx: Add Intel ARCH support to cc_platform_has() Kuppuswamy Sathyanarayanan
2021-10-05  4:47   ` Randy Dunlap
2021-10-05 12:29     ` Kuppuswamy, Sathyanarayanan
2021-10-05 21:16   ` Josh Poimboeuf
2021-10-05 21:42     ` Kuppuswamy, Sathyanarayanan
2021-10-06 18:02     ` Borislav Petkov
2021-10-06 18:14       ` Kuppuswamy, Sathyanarayanan
2021-10-05  2:51 ` [PATCH v8 05/11] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kuppuswamy Sathyanarayanan
2021-10-06  5:53   ` Josh Poimboeuf
2021-10-06 16:52     ` Kuppuswamy, Sathyanarayanan
2021-10-07  9:33   ` Borislav Petkov
2021-10-07 16:55     ` Kuppuswamy, Sathyanarayanan
2021-10-05  2:52 ` [PATCH v8 06/11] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-10-06 18:40   ` Josh Poimboeuf
2021-10-07 17:06   ` Borislav Petkov
2021-10-07 17:22     ` Kuppuswamy, Sathyanarayanan
2021-10-07 17:32       ` Borislav Petkov
2021-10-17 17:15     ` Dave Hansen
2021-10-18 10:53       ` Borislav Petkov
2021-10-18 14:05         ` Dave Hansen
2021-10-18 14:09           ` Borislav Petkov
2021-10-09  3:56   ` Lai Jiangshan
2021-10-11 15:06     ` Sean Christopherson
2021-10-11 16:49       ` Andi Kleen
2021-10-05  2:52 ` [PATCH v8 07/11] x86/tdx: Add HLT " Kuppuswamy Sathyanarayanan
2021-10-06 19:17   ` Josh Poimboeuf
2021-10-07 19:25     ` Kuppuswamy, Sathyanarayanan
2021-10-08 17:31   ` Borislav Petkov
2021-10-08 17:38     ` Kuppuswamy, Sathyanarayanan
2021-10-08 17:59       ` Borislav Petkov
2021-10-05  2:52 ` [PATCH v8 08/11] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-10-06 19:34   ` Josh Poimboeuf
2021-10-06 19:40     ` Borislav Petkov
2021-11-05 20:59   ` Sean Christopherson
2021-11-12 16:17     ` Sathyanarayanan Kuppuswamy
2021-10-05  2:52 ` [PATCH v8 09/11] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-10-05 23:22   ` Josh Poimboeuf
2021-10-06  0:48     ` Kuppuswamy, Sathyanarayanan
2021-10-06 19:49   ` Josh Poimboeuf
2021-10-08  2:16     ` Kuppuswamy, Sathyanarayanan
2021-10-05  2:52 ` [PATCH v8 10/11] x86/tdx: Don't write CSTAR MSR on Intel Kuppuswamy Sathyanarayanan
2021-10-05  2:52 ` [PATCH v8 11/11] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
2021-10-06 20:26   ` Josh Poimboeuf
2021-10-08  2:25     ` Kuppuswamy, Sathyanarayanan
2021-10-11 18:16       ` Josh Poimboeuf

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