From: Borislav Petkov <bp@alien8.de>
To: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.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>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
Sean Christopherson <seanjc@google.com>,
linux-kernel@vger.kernel.org, x86@kernel.org
Subject: Re: [PATCH v1 04/11] x86/x86: Add is_tdx_guest() interface
Date: Thu, 10 Jun 2021 21:59:48 +0200 [thread overview]
Message-ID: <YMJvNGyIaBItV9c6@zn.tnic> (raw)
In-Reply-To: <20210602022136.2186759-5-sathyanarayanan.kuppuswamy@linux.intel.com>
On Tue, Jun 01, 2021 at 07:21:29PM -0700, Kuppuswamy Sathyanarayanan wrote:
> +static int __ro_after_init tdx_guest = -1;
> +
> +static inline bool native_cpuid_has_tdx_guest(void)
> +{
> + u32 eax = TDX_CPUID_LEAF_ID, signature[3] = {0};
> +
> + if (native_cpuid_eax(0) < TDX_CPUID_LEAF_ID)
> + return false;
> +
> + native_cpuid(&eax, &signature[0], &signature[1], &signature[2]);
> +
> + if (memcmp("IntelTDX ", signature, 12))
> + return false;
> +
> + return true;
As before,
return !memcmp(...
and then that function can return simply an int.
> +}
> +
> +bool is_tdx_guest(void)
If anything, this should be early_is_tdx_guest().
> +{
> + if (tdx_guest < 0)
> + tdx_guest = native_cpuid_has_tdx_guest();
> +
> + return !!tdx_guest;
> +}
> +
Applying: x86/x86: Add is_tdx_guest() interface
.git/rebase-apply/patch:58: new blank line at EOF.
+
warning: 1 line adds whitespace errors.
> diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c
> index 5b14b72e41c5..5e70617e9877 100644
> --- a/arch/x86/kernel/tdx.c
> +++ b/arch/x86/kernel/tdx.c
> @@ -19,6 +19,12 @@ static inline bool cpuid_has_tdx_guest(void)
> return true;
> }
>
> +bool is_tdx_guest(void)
> +{
> + return static_cpu_has(X86_FEATURE_TDX_GUEST);
> +}
> +EXPORT_SYMBOL_GPL(is_tdx_guest);
I don't like this is_tdx_guest() thing in kernel proper - what's wrong
with
prot_guest_has(PR_GUEST_TDX)
?
Also, why is it exported, for kvm?
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-06-10 19:59 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 2:21 [PATCH v1 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 01/11] x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config option Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 03/11] x86/cpufeatures: Add TDX Guest CPU feature Kuppuswamy Sathyanarayanan
2021-06-07 14:32 ` Tom Lendacky
2021-06-07 16:59 ` Kuppuswamy, Sathyanarayanan
2021-06-10 12:28 ` Borislav Petkov
2021-06-10 14:28 ` Kuppuswamy, Sathyanarayanan
2021-06-10 14:29 ` Kirill A. Shutemov
2021-06-10 14:35 ` Borislav Petkov
2021-06-10 14:41 ` Kirill A. Shutemov
2021-06-10 15:56 ` Borislav Petkov
2021-06-12 21:02 ` [PATCH v2 03/12] " Kuppuswamy Sathyanarayanan
2021-06-16 9:52 ` Borislav Petkov
2021-06-16 16:57 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 04/11] x86/x86: Add is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-06-10 19:59 ` Borislav Petkov [this message]
2021-06-10 21:01 ` Kuppuswamy, Sathyanarayanan
2021-06-10 21:07 ` Borislav Petkov
2021-06-12 21:04 ` [PATCH v2 04/12] x86/x86: Add early_is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-06-17 17:05 ` Borislav Petkov
2021-06-18 19:14 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 05/11] x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions Kuppuswamy Sathyanarayanan
2021-06-14 8:47 ` Borislav Petkov
2021-06-14 19:45 ` Kuppuswamy, Sathyanarayanan
2021-06-14 20:11 ` Borislav Petkov
2021-06-14 21:37 ` Kuppuswamy, Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 06/11] x86/tdx: Get TD execution environment information via TDINFO Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 07/11] x86/traps: Add #VE support for TDX guest Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 08/11] x86/tdx: Add HLT " Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 09/11] x86/tdx: Wire up KVM hypercalls Kuppuswamy Sathyanarayanan
2021-06-12 21:08 ` [PATCH v2 10/12] " Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 10/11] x86/tdx: Add MSR support for TDX guest Kuppuswamy Sathyanarayanan
2021-06-02 2:21 ` [PATCH v1 11/11] x86/tdx: Handle CPUID via #VE Kuppuswamy Sathyanarayanan
-- strict thread matches above, loose matches on Subject: below --
2021-06-02 2:18 [PATCH v1 00/11] Add TDX Guest Support (Initial support) Kuppuswamy Sathyanarayanan
2021-06-02 2:18 ` [PATCH v1 04/11] x86/x86: Add is_tdx_guest() interface Kuppuswamy Sathyanarayanan
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