From: "Jan Beulich" <JBeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Tim Deegan <tim@xen.org>, Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH v3 03/28] xen/public: Export cpu featureset information in the public API
Date: Fri, 18 Mar 2016 09:52:18 -0600 [thread overview]
Message-ID: <56EC324202000078000DE6D4@prv-mh.provo.novell.com> (raw)
In-Reply-To: <1458056124-8024-4-git-send-email-andrew.cooper3@citrix.com>
>>> On 15.03.16 at 16:34, <andrew.cooper3@citrix.com> wrote:
> -/* Other features, Linux-defined mapping, word 3 */
> +/* Other features, Linux-defined mapping, FSMAX+1 */
> /* This range is used for feature bits which conflict or are synthesized */
I think this should become "Xen-defined" and ...
> +#define X86_FEATURE_CONSTANT_TSC ((FSCAPINTS+0)*32+ 8) /* TSC ticks at a constant rate */
> +#define X86_FEATURE_NONSTOP_TSC ((FSCAPINTS+0)*32+ 9) /* TSC does not stop in C states */
> +#define X86_FEATURE_ARAT ((FSCAPINTS+0)*32+10) /* Always running APIC timer */
> +#define X86_FEATURE_ARCH_PERFMON ((FSCAPINTS+0)*32+11) /* Intel Architectural PerfMon */
> +#define X86_FEATURE_TSC_RELIABLE ((FSCAPINTS+0)*32+12) /* TSC is known to be reliable */
> +#define X86_FEATURE_XTOPOLOGY ((FSCAPINTS+0)*32+13) /* cpu topology enum extensions */
> +#define X86_FEATURE_CPUID_FAULTING ((FSCAPINTS+0)*32+14) /* cpuid faulting */
> +#define X86_FEATURE_CLFLUSH_MONITOR ((FSCAPINTS+0)*32+15) /* clflush reqd with monitor */
> +#define X86_FEATURE_APERFMPERF ((FSCAPINTS+0)*32+16) /* APERFMPERF */
... these could get re-adjusted to start at bit zero.
> --- /dev/null
> +++ b/xen/include/asm-x86/cpufeatureset.h
> @@ -0,0 +1,22 @@
> +#ifndef __XEN_X86_CPUFEATURESET_H__
> +#define __XEN_X86_CPUFEATURESET_H__
> +
> +#ifndef __ASSEMBLY__
> +
> +#define XEN_CPUFEATURE(name, value) X86_FEATURE_##name = value,
> +enum {
> +#include <public/arch-x86/cpufeatureset.h>
> +#undef XEN_CPUFEATURE
> +};
> +
> +#define XEN_CPUFEATURE(name, value) asm (".equ X86_FEATURE_" #name ", "
> #value);
> +#include <public/arch-x86/cpufeatureset.h>
> +
> +#else /* !__ASSEMBLY__ */
> +
> +#define XEN_CPUFEATURE(name, value) .equ X86_FEATURE_##name, value
> +#include <public/arch-x86/cpufeatureset.h>
> +
> +#endif /* __ASSEMBLY__ */
> +
> +#endif /* !__XEN_X86_CPUFEATURESET_H__ */
It seems wrong for XEN_CPUFEATURE() to remain defined. See
how it would have been easier if you did this just like
public/errno.h does (to your disliking)?
> +#ifndef XEN_CPUFEATURE
> +
> +/*
> + * Includer has not provided a custom XEN_CPUFEATURE(). Arrange for normal
> + * header guards, an automatic enum (for C code) and constants in the
> + * XEN_X86_FEATURE_xxx namespace.
> + */
> +#ifndef __XEN_PUBLIC_ARCH_X86_CPUFEATURESET_H__
> +#define __XEN_PUBLIC_ARCH_X86_CPUFEATURESET_H__
> +
> +#define XEN_CPUFEATURESET_DEFAULT_INCLUDE
> +
> +#ifndef __ASSEMBLY__
> +
> +#define XEN_CPUFEATURE(name, value) XEN_X86_FEATURE_##name = value,
> +enum {
> +
> +#else /* !__ASSEMBLY__ */
> +
> +#define XEN_CPUFEATURE(name, value) .equ XEN_X86_FEATURE_##name, value
I think we shouldn't go as far as helping assembly use of these
constants - people can arrange for that themselves by including
this header in a "non-default" way. (Also - who knows which
assemblers understand .equ and which don't.) I now view
having done so in public/errno.h as a mistake, even if those
equates may be slightly more likely to be occasionally used in
assembly code. Therefore I'm inclined to make those dependent
upon __XEN_INTERFACE_VERSION__ < 0x00040700.
Jan
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next prev parent reply other threads:[~2016-03-18 15:52 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-15 15:34 [PATCH RFC v3 00/28] x86: Improvements to cpuid handling for guests Andrew Cooper
2016-03-15 15:34 ` [PATCH v3 01/28] xen/x86: Drop unused and non-useful feature definitions Andrew Cooper
2016-03-16 7:53 ` Konrad Rzeszutek Wilk
2016-03-16 9:49 ` Andrew Cooper
2016-03-22 14:06 ` Doug Goldstein
2016-03-22 14:38 ` Jan Beulich
2016-03-15 15:34 ` [PATCH v3 02/28] xen/x86: Rename features to be closer to the vendor definitions Andrew Cooper
2016-03-16 8:01 ` Konrad Rzeszutek Wilk
2016-03-17 19:46 ` Andrew Cooper
2016-03-15 15:34 ` [PATCH v3 03/28] xen/public: Export cpu featureset information in the public API Andrew Cooper
2016-03-16 8:32 ` Konrad Rzeszutek Wilk
2016-03-22 10:39 ` Andrew Cooper
2016-03-18 15:52 ` Jan Beulich [this message]
2016-03-15 15:35 ` [PATCH v3 04/28] xen/x86: Script to automatically process featureset information Andrew Cooper
2016-03-16 8:41 ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 05/28] xen/x86: Collect more cpuid feature leaves Andrew Cooper
2016-03-16 8:50 ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 06/28] xen/x86: Mask out unknown features from Xen's capabilities Andrew Cooper
2016-03-16 18:01 ` Konrad Rzeszutek Wilk
2016-03-15 15:35 ` [PATCH v3 07/28] xen/x86: Annotate special features Andrew Cooper
2016-03-16 18:04 ` Konrad Rzeszutek Wilk
2016-03-18 16:29 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 08/28] xen/x86: Annotate VM applicability in featureset Andrew Cooper
2016-03-16 18:15 ` Konrad Rzeszutek Wilk
2016-03-18 16:57 ` Jan Beulich
2016-03-18 18:56 ` Andrew Cooper
2016-03-21 11:53 ` Jan Beulich
2016-03-21 13:39 ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 09/28] xen/x86: Calculate maximum host and guest featuresets Andrew Cooper
2016-03-16 18:24 ` Konrad Rzeszutek Wilk
2016-03-18 17:09 ` Jan Beulich
2016-03-22 11:23 ` Andrew Cooper
2016-03-22 12:39 ` Jan Beulich
2016-03-22 14:37 ` Andrew Cooper
2016-03-22 14:52 ` Jan Beulich
2016-03-22 15:01 ` Andrew Cooper
2016-03-22 16:10 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 10/28] xen/x86: Generate deep dependencies of features Andrew Cooper
2016-03-17 19:45 ` Konrad Rzeszutek Wilk
2016-03-17 20:14 ` Andrew Cooper
2016-03-17 20:32 ` Konrad Rzeszutek Wilk
2016-03-21 15:41 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 11/28] xen/x86: Clear dependent features when clearing a cpu cap Andrew Cooper
2016-03-17 19:51 ` Konrad Rzeszutek Wilk
2016-03-17 19:56 ` Andrew Cooper
2016-03-28 15:02 ` Konrad Rzeszutek Wilk
2016-03-21 15:45 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 12/28] xen/x86: Improve disabling of features which have dependencies Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 13/28] xen/x86: Improvements to in-hypervisor cpuid sanity checks Andrew Cooper
2016-03-21 16:11 ` Jan Beulich
2016-03-22 15:30 ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 14/28] x86/cpu: Move set_cpumask() calls into c_early_init() Andrew Cooper
2016-03-21 16:16 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 15/28] x86/cpu: Sysctl and common infrastructure for levelling context switching Andrew Cooper
2016-03-15 17:35 ` Joao Martins
2016-03-15 19:29 ` Andrew Cooper
2016-03-15 19:34 ` Joao Martins
2016-03-21 16:23 ` Jan Beulich
2016-03-22 15:57 ` Andrew Cooper
2016-03-22 16:16 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 16/28] x86/cpu: Rework AMD masking MSR setup Andrew Cooper
2016-03-21 16:51 ` Jan Beulich
2016-03-21 16:55 ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 17/28] x86/cpu: Rework Intel masking/faulting setup Andrew Cooper
2016-03-21 16:44 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 18/28] x86/cpu: Context switch cpuid masks and faulting state in context_switch() Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 19/28] x86/pv: Provide custom cpumasks for PV domains Andrew Cooper
2016-03-21 16:53 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 20/28] x86/domctl: Update PV domain cpumasks when setting cpuid policy Andrew Cooper
2016-03-21 17:06 ` Jan Beulich
2016-03-22 16:37 ` Andrew Cooper
2016-03-22 16:51 ` Jan Beulich
2016-03-15 15:35 ` [PATCH v3 21/28] xen+tools: Export maximum host and guest cpu featuresets via SYSCTL Andrew Cooper
2016-03-16 18:23 ` Wei Liu
2016-03-16 20:38 ` David Scott
2016-03-22 8:43 ` Jan Beulich
2016-03-22 20:39 ` Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 22/28] tools/libxc: Modify bitmap operations to take void pointers Andrew Cooper
2016-03-16 15:24 ` Andrew Cooper
2016-03-17 12:17 ` Wei Liu
2016-03-15 15:35 ` [PATCH v3 23/28] tools/libxc: Use public/featureset.h for cpuid policy generation Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 24/28] tools/libxc: Expose the automatically generated cpu featuremask information Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 25/28] tools: Utility for dealing with featuresets Andrew Cooper
2016-03-16 18:23 ` Wei Liu
2016-03-15 15:35 ` [PATCH v3 26/28] tools/libxc: Wire a featureset through to cpuid policy logic Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 27/28] tools/libxc: Use featuresets rather than guesswork Andrew Cooper
2016-03-15 15:35 ` [PATCH v3 28/28] tools/libxc: Calculate xstate cpuid leaf from guest information Andrew Cooper
2016-03-16 18:23 ` Wei Liu
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