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rspamd-69c95c757c-zt9v2; auth=pass smtp.auth=dreamhost smtp.mailfrom=kjlx@templeofstupid.com X-Sender-Id: dreamhost|x-authsender|kjlx@templeofstupid.com X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|kjlx@templeofstupid.com X-MailChannels-Auth-Id: dreamhost X-Wide-Eyed-Spicy: 79a11c450360c0dc_1674599719422_4293014534 X-MC-Loop-Signature: 1674599719422:603297941 X-MC-Ingress-Time: 1674599719421 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=templeofstupid.com; s=dreamhost; t=1674599718; bh=/rnaVJdqABJD+0Xa4hNZqIvtAk2JjITERqbT0AFef+k=; h=Date:From:To:Cc:Subject:Content-Type; b=DCwDfkrjRjWhSLFFfdj2dLanchkSI4muoA5sq2O2hGbpxiHWlMqkrXZWRhq1zb0Eg yG6KGvxN1IvDut6OH6xEilCiB1laUUTSFeC1O/x1V+t6RztzIgtKDWbcLkhzPtR/bM x2nCRKpRjWfEp22eX+bsrW2UzIQrz+rezO8mVdpw= Date: Tue, 24 Jan 2023 14:35:16 -0800 From: Krister Johansen To: Jan Beulich , Andrew Cooper , Roger Pau =?utf-8?B?TW9ubsOp?= , Wei Liu Cc: xen-devel@lists.xenproject.org, Juergen Gross , Boris Ostrovsky , David Reaver Subject: [PATCH] xen/x86: public: add TSC defines for cpuid leaf 4 Message-ID: <20230124223516.GA1962@templeofstupid.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Cpuid leaf 4 contains information about how the state of the tsc, its mode, and some additional information. A commit that is queued for linux would like to use this to determine whether the tsc mode has been set to 'no emulation' in order to make some decisions about which clocksource is more reliable. Expose this information in the public API headers so that they can subsequently be imported into linux and used there. Link: https://lore.kernel.org/xen-devel/eda8d9f2-3013-1b68-0df8-64d7f13ee35e@suse.com/ Link: https://lore.kernel.org/xen-devel/0835453d-9617-48d5-b2dc-77a2ac298bad@oracle.com/ Signed-off-by: Krister Johansen --- xen/include/public/arch-x86/cpuid.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/xen/include/public/arch-x86/cpuid.h b/xen/include/public/arch-x86/cpuid.h index 7ecd16ae05..97dc970417 100644 --- a/xen/include/public/arch-x86/cpuid.h +++ b/xen/include/public/arch-x86/cpuid.h @@ -71,6 +71,12 @@ * EDX: shift amount for tsc->ns conversion * Sub-leaf 2: EAX: host tsc frequency in kHz */ +#define XEN_CPUID_TSC_EMULATED (1u << 0) +#define XEN_CPUID_HOST_TSC_RELIABLE (1u << 1) +#define XEN_CPUID_RDTSCP_INSTR_AVAIL (1u << 2) +#define XEN_CPUID_TSC_MODE_DEFAULT (0) +#define XEN_CPUID_TSC_MODE_EMULATE (1u) +#define XEN_CPUID_TSC_MODE_NOEMULATE (2u) /* * Leaf 5 (0x40000x04) -- 2.25.1