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From: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
	linux-graphics-maintainer@vmware.com,
	amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org,
	Andi Kleen <ak@linux.intel.com>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	Brijesh Singh <brijesh.singh@amd.com>
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features
Date: Wed, 28 Jul 2021 18:28:01 +0200	[thread overview]
Message-ID: <YQGFh3BlaD8RAEBz@nazgul.tnic> (raw)
In-Reply-To: <YQFY5/cq2thyHzUe@infradead.org>

On Wed, Jul 28, 2021 at 02:17:27PM +0100, Christoph Hellwig wrote:
> So common checks obviously make sense, but I really hate the stupid
> multiplexer.  Having one well-documented helper per feature is much
> easier to follow.

We had that in x86 - it was called cpu_has_<xxx> where xxx is the
feature bit. It didn't scale with the sheer amount of feature bits that
kept getting added so we do cpu_feature_enabled(X86_FEATURE_XXX) now.

The idea behind this is very similar - those protected guest flags
will only grow in the couple of tens range - at least - so having a
multiplexer is a lot simpler, I'd say, than having a couple of tens of
helpers. And those PATTR flags should have good, readable names, btw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-efi@vger.kernel.org, Tianyu Lan <Tianyu.Lan@microsoft.com>,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	amd-gfx@lists.freedesktop.org,
	platform-driver-x86@vger.kernel.org,
	iommu@lists.linux-foundation.org, Andi Kleen <ak@linux.intel.com>,
	linux-graphics-maintainer@vmware.com,
	dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org,
	Brijesh Singh <brijesh.singh@amd.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features
Date: Wed, 28 Jul 2021 18:28:01 +0200	[thread overview]
Message-ID: <YQGFh3BlaD8RAEBz@nazgul.tnic> (raw)
In-Reply-To: <YQFY5/cq2thyHzUe@infradead.org>

On Wed, Jul 28, 2021 at 02:17:27PM +0100, Christoph Hellwig wrote:
> So common checks obviously make sense, but I really hate the stupid
> multiplexer.  Having one well-documented helper per feature is much
> easier to follow.

We had that in x86 - it was called cpu_has_<xxx> where xxx is the
feature bit. It didn't scale with the sheer amount of feature bits that
kept getting added so we do cpu_feature_enabled(X86_FEATURE_XXX) now.

The idea behind this is very similar - those protected guest flags
will only grow in the couple of tens range - at least - so having a
multiplexer is a lot simpler, I'd say, than having a couple of tens of
helpers. And those PATTR flags should have good, readable names, btw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-efi@vger.kernel.org, Tianyu Lan <Tianyu.Lan@microsoft.com>,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	amd-gfx@lists.freedesktop.org,
	platform-driver-x86@vger.kernel.org,
	iommu@lists.linux-foundation.org, Andi Kleen <ak@linux.intel.com>,
	linux-graphics-maintainer@vmware.com,
	dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org,
	Brijesh Singh <brijesh.singh@amd.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features
Date: Wed, 28 Jul 2021 18:28:01 +0200	[thread overview]
Message-ID: <YQGFh3BlaD8RAEBz@nazgul.tnic> (raw)
In-Reply-To: <YQFY5/cq2thyHzUe@infradead.org>

On Wed, Jul 28, 2021 at 02:17:27PM +0100, Christoph Hellwig wrote:
> So common checks obviously make sense, but I really hate the stupid
> multiplexer.  Having one well-documented helper per feature is much
> easier to follow.

We had that in x86 - it was called cpu_has_<xxx> where xxx is the
feature bit. It didn't scale with the sheer amount of feature bits that
kept getting added so we do cpu_feature_enabled(X86_FEATURE_XXX) now.

The idea behind this is very similar - those protected guest flags
will only grow in the couple of tens range - at least - so having a
multiplexer is a lot simpler, I'd say, than having a couple of tens of
helpers. And those PATTR flags should have good, readable names, btw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-efi@vger.kernel.org, Tianyu Lan <Tianyu.Lan@microsoft.com>,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	amd-gfx@lists.freedesktop.org,
	platform-driver-x86@vger.kernel.org,
	iommu@lists.linux-foundation.org, Andi Kleen <ak@linux.intel.com>,
	linux-graphics-maintainer@vmware.com,
	dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org,
	Brijesh Singh <brijesh.singh@amd.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features
Date: Wed, 28 Jul 2021 18:28:01 +0200	[thread overview]
Message-ID: <YQGFh3BlaD8RAEBz@nazgul.tnic> (raw)
In-Reply-To: <YQFY5/cq2thyHzUe@infradead.org>

On Wed, Jul 28, 2021 at 02:17:27PM +0100, Christoph Hellwig wrote:
> So common checks obviously make sense, but I really hate the stupid
> multiplexer.  Having one well-documented helper per feature is much
> easier to follow.

We had that in x86 - it was called cpu_has_<xxx> where xxx is the
feature bit. It didn't scale with the sheer amount of feature bits that
kept getting added so we do cpu_feature_enabled(X86_FEATURE_XXX) now.

The idea behind this is very similar - those protected guest flags
will only grow in the couple of tens range - at least - so having a
multiplexer is a lot simpler, I'd say, than having a couple of tens of
helpers. And those PATTR flags should have good, readable names, btw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
	linux-graphics-maintainer@vmware.com,
	amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org,
	Andi Kleen <ak@linux.intel.com>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	Brijesh Singh <brijesh.singh@amd.com>
Subject: Re: [PATCH 01/11] mm: Introduce a function to check for virtualization protection features
Date: Wed, 28 Jul 2021 18:28:01 +0200	[thread overview]
Message-ID: <YQGFh3BlaD8RAEBz@nazgul.tnic> (raw)
In-Reply-To: <YQFY5/cq2thyHzUe@infradead.org>

On Wed, Jul 28, 2021 at 02:17:27PM +0100, Christoph Hellwig wrote:
> So common checks obviously make sense, but I really hate the stupid
> multiplexer.  Having one well-documented helper per feature is much
> easier to follow.

We had that in x86 - it was called cpu_has_<xxx> where xxx is the
feature bit. It didn't scale with the sheer amount of feature bits that
kept getting added so we do cpu_feature_enabled(X86_FEATURE_XXX) now.

The idea behind this is very similar - those protected guest flags
will only grow in the couple of tens range - at least - so having a
multiplexer is a lot simpler, I'd say, than having a couple of tens of
helpers. And those PATTR flags should have good, readable names, btw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  reply	other threads:[~2021-07-28 16:27 UTC|newest]

Thread overview: 214+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 22:26 [PATCH 00/11] Implement generic prot_guest_has() helper function Tom Lendacky
2021-07-27 22:26 ` Tom Lendacky
2021-07-27 22:26 ` Tom Lendacky
2021-07-27 22:26 ` Tom Lendacky
2021-07-27 22:26 ` Tom Lendacky via iommu
2021-07-27 22:26 ` Tom Lendacky
2021-07-27 22:26 ` [PATCH 01/11] mm: Introduce a function to check for virtualization protection features Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-28 13:17   ` Christoph Hellwig
2021-07-28 13:17     ` Christoph Hellwig
2021-07-28 13:17     ` Christoph Hellwig
2021-07-28 13:17     ` Christoph Hellwig
2021-07-28 13:17     ` Christoph Hellwig
2021-07-28 16:28     ` Borislav Petkov [this message]
2021-07-28 16:28       ` Borislav Petkov
2021-07-28 16:28       ` Borislav Petkov
2021-07-28 16:28       ` Borislav Petkov
2021-07-28 16:28       ` Borislav Petkov
2021-08-02 10:34   ` Joerg Roedel
2021-08-02 10:34     ` Joerg Roedel
2021-08-02 10:34     ` Joerg Roedel
2021-08-02 10:34     ` Joerg Roedel
2021-08-11 14:53   ` Kuppuswamy, Sathyanarayanan
2021-08-11 14:53     ` Kuppuswamy, Sathyanarayanan
2021-08-11 14:53     ` Kuppuswamy, Sathyanarayanan
2021-08-11 14:53     ` Kuppuswamy, Sathyanarayanan
2021-08-11 14:53     ` Kuppuswamy, Sathyanarayanan
2021-08-11 15:39     ` Tom Lendacky
2021-08-11 15:39       ` Tom Lendacky
2021-08-11 15:39       ` Tom Lendacky
2021-08-11 15:39       ` Tom Lendacky via iommu
2021-08-11 15:39       ` Tom Lendacky
2021-07-27 22:26 ` [PATCH 02/11] x86/sev: Add an x86 version of prot_guest_has() Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-28 13:22   ` Christoph Hellwig
2021-07-28 13:22     ` Christoph Hellwig
2021-07-28 13:22     ` Christoph Hellwig
2021-07-28 13:22     ` Christoph Hellwig
2021-07-28 13:22     ` Christoph Hellwig
2021-07-29 14:24     ` Tom Lendacky
2021-07-29 14:24       ` Tom Lendacky
2021-07-29 14:24       ` Tom Lendacky
2021-07-29 14:24       ` Tom Lendacky via iommu
2021-07-29 14:24       ` Tom Lendacky
2021-08-02 10:35   ` Joerg Roedel
2021-08-02 10:35     ` Joerg Roedel
2021-08-02 10:35     ` Joerg Roedel
2021-08-02 10:35     ` Joerg Roedel
2021-07-27 22:26 ` [PATCH 03/11] powerpc/pseries/svm: Add a powerpc " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26 ` [PATCH 04/11] x86/sme: Replace occurrences of sme_active() with prot_guest_has() Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-08-02 10:37   ` Joerg Roedel
2021-08-02 10:37     ` Joerg Roedel
2021-08-02 10:37     ` Joerg Roedel
2021-08-02 10:37     ` Joerg Roedel
2021-07-27 22:26 ` [PATCH 05/11] x86/sev: Replace occurrences of sev_active() " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-08-02 10:42   ` Joerg Roedel
2021-08-02 10:42     ` Joerg Roedel
2021-08-02 10:42     ` Joerg Roedel
2021-08-02 10:42     ` Joerg Roedel
2021-07-27 22:26 ` [PATCH 06/11] x86/sev: Replace occurrences of sev_es_active() " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-08-02 10:45   ` Joerg Roedel
2021-08-02 10:45     ` Joerg Roedel
2021-08-02 10:45     ` Joerg Roedel
2021-08-02 10:45     ` Joerg Roedel
2021-08-09 21:59     ` Tom Lendacky
2021-08-09 21:59       ` Tom Lendacky
2021-08-09 21:59       ` Tom Lendacky
2021-08-09 21:59       ` Tom Lendacky via iommu
2021-08-09 21:59       ` Tom Lendacky
2021-08-09 22:08       ` Kuppuswamy, Sathyanarayanan
2021-08-09 22:08         ` Kuppuswamy, Sathyanarayanan
2021-08-09 22:08         ` Kuppuswamy, Sathyanarayanan
2021-08-09 22:08         ` Kuppuswamy, Sathyanarayanan
2021-08-09 22:08         ` Kuppuswamy, Sathyanarayanan
2021-07-27 22:26 ` [PATCH 07/11] treewide: Replace the use of mem_encrypt_active() " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-30 22:34   ` Sean Christopherson
2021-07-30 22:34     ` Sean Christopherson
2021-07-30 22:34     ` Sean Christopherson
2021-07-30 22:34     ` Sean Christopherson via iommu
2021-07-30 22:34     ` Sean Christopherson
2021-08-09 21:55     ` Tom Lendacky
2021-08-09 21:55       ` Tom Lendacky
2021-08-09 21:55       ` Tom Lendacky
2021-08-09 21:55       ` Tom Lendacky via iommu
2021-08-09 21:55       ` Tom Lendacky
2021-08-02 12:42   ` Christophe Leroy
2021-08-02 12:42     ` Christophe Leroy
2021-08-02 12:42     ` Christophe Leroy
2021-08-02 12:42     ` Christophe Leroy
2021-08-02 12:42     ` Christophe Leroy
2021-08-09 22:04     ` Tom Lendacky
2021-08-09 22:04       ` Tom Lendacky
2021-08-09 22:04       ` Tom Lendacky
2021-08-09 22:04       ` Tom Lendacky via iommu
2021-08-09 22:04       ` Tom Lendacky
2021-08-10 18:45   ` Kuppuswamy, Sathyanarayanan
2021-08-10 18:45     ` Kuppuswamy, Sathyanarayanan
2021-08-10 18:45     ` Kuppuswamy, Sathyanarayanan
2021-08-10 18:45     ` Kuppuswamy, Sathyanarayanan
2021-08-10 18:45     ` Kuppuswamy, Sathyanarayanan
2021-08-10 19:48     ` Tom Lendacky
2021-08-10 19:48       ` Tom Lendacky
2021-08-10 19:48       ` Tom Lendacky
2021-08-10 19:48       ` Tom Lendacky via iommu
2021-08-10 19:48       ` Tom Lendacky
2021-08-10 20:09       ` Kuppuswamy, Sathyanarayanan
2021-08-10 20:09         ` Kuppuswamy, Sathyanarayanan
2021-08-10 20:09         ` Kuppuswamy, Sathyanarayanan
2021-08-10 20:09         ` Kuppuswamy, Sathyanarayanan
2021-08-10 20:09         ` Kuppuswamy, Sathyanarayanan
2021-08-11 12:19       ` Kirill A. Shutemov
2021-08-11 12:19         ` Kirill A. Shutemov
2021-08-11 12:19         ` Kirill A. Shutemov
2021-08-11 12:19         ` Kirill A. Shutemov
2021-08-11 12:19         ` Kirill A. Shutemov
2021-08-11 15:52         ` Tom Lendacky
2021-08-11 15:52           ` Tom Lendacky
2021-08-11 15:52           ` Tom Lendacky
2021-08-11 15:52           ` Tom Lendacky via iommu
2021-08-11 15:52           ` Tom Lendacky
2021-08-12 10:07           ` Kirill A. Shutemov
2021-08-12 10:07             ` Kirill A. Shutemov
2021-08-12 10:07             ` Kirill A. Shutemov
2021-08-12 10:07             ` Kirill A. Shutemov
2021-08-12 10:07             ` Kirill A. Shutemov
2021-08-13 17:08             ` Tom Lendacky
2021-08-13 17:08               ` Tom Lendacky
2021-08-13 17:08               ` Tom Lendacky
2021-08-13 17:08               ` Tom Lendacky via iommu
2021-08-13 17:08               ` Tom Lendacky
2021-08-13 20:17               ` Tom Lendacky
2021-08-13 20:17                 ` Tom Lendacky
2021-08-13 20:17                 ` Tom Lendacky
2021-08-13 20:17                 ` Tom Lendacky via iommu
2021-08-13 20:17                 ` Tom Lendacky
2021-07-27 22:26 ` [PATCH 08/11] mm: Remove the now unused mem_encrypt_active() function Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-08-02 10:47   ` Joerg Roedel
2021-08-02 10:47     ` Joerg Roedel
2021-08-02 10:47     ` Joerg Roedel
2021-08-02 10:47     ` Joerg Roedel
2021-07-27 22:26 ` [PATCH 09/11] x86/sev: " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-08-02 10:46   ` Joerg Roedel
2021-08-02 10:46     ` Joerg Roedel
2021-08-02 10:46     ` Joerg Roedel
2021-08-02 10:46     ` Joerg Roedel
2021-07-27 22:26 ` [PATCH 10/11] powerpc/pseries/svm: " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26 ` [PATCH 11/11] s390/mm: " Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:26   ` Tom Lendacky via iommu
2021-07-27 22:26   ` Tom Lendacky
2021-07-27 22:37 ` [PATCH 00/11] Implement generic prot_guest_has() helper function Tom Lendacky
2021-07-27 22:37   ` Tom Lendacky
2021-07-27 22:37   ` Tom Lendacky
2021-07-27 22:37   ` Tom Lendacky
2021-07-27 22:37   ` Tom Lendacky via iommu
2021-07-27 22:37   ` Tom Lendacky
2021-07-28 11:50 ` Christian König
2021-07-28 11:50   ` Christian König
2021-07-28 11:50   ` Christian König
2021-07-28 11:50   ` Christian König
2021-07-28 11:50   ` Christian König
2021-07-28 11:50   ` Christian König
2021-08-09  1:41 ` Kuppuswamy, Sathyanarayanan
2021-08-09  1:41   ` Kuppuswamy, Sathyanarayanan
2021-08-09  1:41   ` Kuppuswamy, Sathyanarayanan
2021-08-09  1:41   ` Kuppuswamy, Sathyanarayanan
2021-08-09  1:41   ` Kuppuswamy, Sathyanarayanan
2021-08-09 22:16   ` Tom Lendacky
2021-08-09 22:16     ` Tom Lendacky
2021-08-09 22:16     ` Tom Lendacky
2021-08-09 22:16     ` Tom Lendacky via iommu
2021-08-09 22:16     ` Tom Lendacky

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