From: Thomas Gleixner <tglx@linutronix.de>
To: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
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>,
Josh Poimboeuf <jpoimboe@redhat.com>,
"H . Peter Anvin" <hpa@zytor.com>
Cc: 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 v7 02/10] x86/tdx: Add early_is_tdx_guest() interface
Date: Sun, 17 Oct 2021 21:28:38 +0200 [thread overview]
Message-ID: <871r4j4fix.ffs@tglx> (raw)
In-Reply-To: <20211005204136.1812078-3-sathyanarayanan.kuppuswamy@linux.intel.com>
On Tue, Oct 05 2021 at 13:41, Kuppuswamy Sathyanarayanan wrote:
> +
> +#define TDX_CPUID_LEAF_ID 0x21
> +
> +static int tdx_guest = -1;
> +
> +static inline bool early_cpuid_has_tdx_guest(void)
> +{
> + u32 eax = TDX_CPUID_LEAF_ID, sig[3] = {0};
> +
> + if (cpuid_eax(0) < TDX_CPUID_LEAF_ID)
> + return false;
> +
> + cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, &sig[0], &sig[2], &sig[1]);
> +
> + return !memcmp("IntelTDX ", sig, 12);
> +}
> +
> +bool early_is_tdx_guest(void)
> +{
> + if (tdx_guest < 0)
> + tdx_guest = early_cpuid_has_tdx_guest();
> +
> + return !!tdx_guest;
> +}
Sigh.
next prev parent reply other threads:[~2021-10-17 19:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-05 20:41 [PATCH v7 00/10] Add TDX Guest Support (#VE handler support) Kuppuswamy Sathyanarayanan
2021-10-05 20:41 ` [PATCH v7 01/10] x86/io: Allow to override inX() and outX() implementation Kuppuswamy Sathyanarayanan
2021-10-17 19:27 ` Thomas Gleixner
2021-10-17 20:17 ` Sathyanarayanan Kuppuswamy
2021-10-05 20:41 ` [PATCH v7 02/10] x86/tdx: Add early_is_tdx_guest() interface Kuppuswamy Sathyanarayanan
2021-10-17 19:28 ` Thomas Gleixner [this message]
2021-10-05 20:41 ` [PATCH v7 03/10] x86/tdx: Handle port I/O in decompression code Kuppuswamy Sathyanarayanan
2021-10-05 20:41 ` [PATCH v7 04/10] x86/tdx: Handle early IO operations Kuppuswamy Sathyanarayanan
2021-11-05 21:12 ` Sean Christopherson
2021-11-05 23:08 ` Sathyanarayanan Kuppuswamy
2021-10-05 20:41 ` [PATCH v7 05/10] x86/tdx: Handle port I/O Kuppuswamy Sathyanarayanan
2021-10-17 19:58 ` Thomas Gleixner
2021-10-17 20:35 ` Sathyanarayanan Kuppuswamy
2021-10-18 13:52 ` Tom Lendacky
2021-10-18 18:42 ` Sathyanarayanan Kuppuswamy
2021-11-05 21:23 ` Sean Christopherson
2021-10-05 20:41 ` [PATCH v7 06/10] x86/insn-eval: Introduce insn_get_modrm_reg_ptr() Kuppuswamy Sathyanarayanan
2021-10-05 20:41 ` [PATCH v7 07/10] x86/insn-eval: Introduce insn_decode_mmio() Kuppuswamy Sathyanarayanan
2021-10-05 20:41 ` [PATCH v7 08/10] x86/sev-es: Use insn_decode_mmio() for MMIO implementation Kuppuswamy Sathyanarayanan
2021-10-05 20:41 ` [PATCH v7 09/10] x86/tdx: Handle in-kernel MMIO Kuppuswamy Sathyanarayanan
2021-11-05 22:41 ` Sean Christopherson
2021-10-05 20:41 ` [PATCH v7 10/10] x86/tdx: Handle MWAIT and MONITOR Kuppuswamy Sathyanarayanan
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