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From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: "Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	x86@kernel.org, "Peter Zijlstra" <peterz@infradead.org>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Tony Luck" <tony.luck@intel.com>,
	"Tony W Wang-oc" <TonyWWang-oc@zhaoxin.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
	"Jiri Olsa" <jolsa@redhat.com>,
	"Namhyung Kim" <namhyung@kernel.org>,
	"Vitaly Kuznetsov" <vkuznets@redhat.com>,
	"Wanpeng Li" <wanpengli@tencent.com>,
	"Jim Mattson" <jmattson@google.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-edac@vger.kernel.org, "Borislav Petkov" <bp@suse.de>,
	"Jarkko Sakkinen" <jarkko.sakkinen@linux.intel.com>
Subject: Re: [PATCH 11/16] x86/cpu: Print VMX features as separate line item in /proc/cpuinfo
Date: Tue, 8 Oct 2019 08:57:30 +0200	[thread overview]
Message-ID: <bd2cffea-6427-b3cc-7098-a881e3d4522d@redhat.com> (raw)
In-Reply-To: <20191007195638.GG18016@linux.intel.com>

On 07/10/19 21:56, Sean Christopherson wrote:
> On Mon, Oct 07, 2019 at 07:12:37PM +0200, Paolo Bonzini wrote:
>> On 04/10/19 23:56, Sean Christopherson wrote:
>>> diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
>>> index cb2e49810d68..4eec8889b0ff 100644
>>> --- a/arch/x86/kernel/cpu/proc.c
>>> +++ b/arch/x86/kernel/cpu/proc.c
>>> @@ -7,6 +7,10 @@
>>>  
>>>  #include "cpu.h"
>>>  
>>> +#ifdef CONFIG_X86_VMX_FEATURE_NAMES
>>> +extern const char * const x86_vmx_flags[NVMXINTS*32];
>>> +#endif
>>> +
>>>  /*
>>>   *	Get CPU information for use by the procfs.
>>>   */
>>> @@ -102,6 +106,17 @@ static int show_cpuinfo(struct seq_file *m, void *v)
>>>  		if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
>>>  			seq_printf(m, " %s", x86_cap_flags[i]);
>>
>> I'm afraid this is going to break some scripts in the wild.  I would
>> simply remove the seq_puts below.
> 
> Can you elaborate?  I'm having trouble connecting the dots...

Somebody is bound to have scripts doing "grep ^flags.*ept /proc/cpuinfo"
or checking for VMX flags under some kind of "if (/^flags/)", so it's
safer not to separate VMX and non-VMX flags.

Paolo

>> Paolo
>>
>>> +#ifdef CONFIG_X86_VMX_FEATURE_NAMES
>>> +	if (cpu_has(c, X86_FEATURE_VMX) && c->vmx_capability[0]) {
>>> +		seq_puts(m, "\nvmx flags\t:");
>>> +		for (i = 0; i < 32*NVMXINTS; i++) {
>>> +			if (test_bit(i, (unsigned long *)c->vmx_capability) &&
>>> +			    x86_vmx_flags[i] != NULL)
>>> +				seq_printf(m, " %s", x86_vmx_flags[i]);
>>> +		}
>>> +	}
>>> +#endif
>>> +
>>>  	seq_puts(m, "\nbugs\t\t:");
>>>  	for (i = 0; i < 32*NBUGINTS; i++) {
>>>  		unsigned int bug_bit = 32*NCAPINTS + i;


  reply	other threads:[~2019-10-08  6:57 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 21:55 [PATCH 00/16] x86/cpu: Clean up handling of VMX features Sean Christopherson
2019-10-04 21:56 ` [PATCH 01/16] x86/intel: Initialize IA32_FEATURE_CONTROL MSR at boot Sean Christopherson
2019-10-07 17:05   ` Paolo Bonzini
2019-10-07 17:10     ` Sean Christopherson
2019-10-04 21:56 ` [PATCH 02/16] x86/mce: WARN once if IA32_FEATURE_CONTROL MSR is left unlocked Sean Christopherson
2019-10-04 21:56 ` [PATCH 03/16] x86/centaur: Use common IA32_FEATURE_CONTROL MSR initialization Sean Christopherson
2019-10-04 21:56 ` [PATCH 04/16] x86/zhaoxin: " Sean Christopherson
2019-10-04 21:56 ` [PATCH 05/16] KVM: VMX: Drop initialization of IA32_FEATURE_CONTROL MSR Sean Christopherson
2019-10-04 23:24   ` Jim Mattson
2019-10-04 21:56 ` [PATCH 06/16] x86/cpu: Clear VMX feature flag if VMX is not fully enabled Sean Christopherson
2019-10-04 21:56 ` [PATCH 07/16] KVM: VMX: Use VMX feature flag to query BIOS enabling Sean Christopherson
2019-10-04 23:26   ` Jim Mattson
2019-10-04 21:56 ` [PATCH 08/16] KVM: VMX: Check for full VMX support when verifying CPU compatibility Sean Christopherson
2019-10-04 23:35   ` Jim Mattson
2019-10-04 21:56 ` [PATCH 09/16] x86/vmx: Introduce VMX_FEATURES_* Sean Christopherson
2019-10-07 17:08   ` Paolo Bonzini
2019-10-07 17:13     ` Sean Christopherson
2019-10-04 21:56 ` [PATCH 10/16] x86/cpu: Detect VMX features on Intel, Centaur and Zhaoxin CPUs Sean Christopherson
2019-10-07 17:11   ` Paolo Bonzini
2019-10-07 19:54     ` Sean Christopherson
2019-10-08  6:55       ` Paolo Bonzini
2019-10-04 21:56 ` [PATCH 11/16] x86/cpu: Print VMX features as separate line item in /proc/cpuinfo Sean Christopherson
2019-10-07 17:12   ` Paolo Bonzini
2019-10-07 19:56     ` Sean Christopherson
2019-10-08  6:57       ` Paolo Bonzini [this message]
2019-10-08 16:53         ` Jim Mattson
2019-10-09 19:16         ` Sean Christopherson
2019-10-09 21:13           ` Paolo Bonzini
2019-10-04 21:56 ` [PATCH 12/16] x86/cpufeatures: Drop synthetic VMX feature flags Sean Christopherson
2019-10-04 21:56 ` [PATCH 13/16] KVM: VMX: Use VMX_FEATURE_* flags to define VMCS control bits Sean Christopherson
2019-10-04 21:56 ` [PATCH 14/16] x86/cpufeatures: Clean up synthetic virtualization flags Sean Christopherson
2019-10-04 21:56 ` [PATCH 15/16] perf/x86: Provide stubs of KVM helpers for non-Intel CPUs Sean Christopherson
2019-10-04 21:56 ` [PATCH 16/16] KVM: VMX: Allow KVM_INTEL when building for Centaur and/or Zhaoxin CPUs Sean Christopherson

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