From: Juergen Gross via Virtualization <virtualization@lists.linux-foundation.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Wanpeng Li <wanpengli@tencent.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Alexey Makhalov <amakhalov@vmware.com>,
xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Peter Zijlstra <peterz@infradead.org>,
Ajay Kaher <akaher@vmware.com>, Ingo Molnar <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative
Date: Wed, 25 Oct 2023 15:31:07 +0200 [thread overview]
Message-ID: <fde7ffdd-4d12-4821-ac51-e67e65637111@suse.com> (raw)
In-Reply-To: <20231025103402.GBZTjvGse9c0utZGO0@fat_crate.local>
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On 25.10.23 12:34, Borislav Petkov wrote:
> On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
>> +/* Low-level backend functions usable from alternative code replacements. */
>> +DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
>> +EXPORT_SYMBOL_GPL(x86_nop);
>
> This is all x86 code so you don't really need the "x86_" prefix - "nop"
> is perfectly fine.
There is
#define nop() asm volatile ("nop")
in arch/x86/include/asm/special_insns.h already.
>
>> +noinstr void x86_BUG(void)
>> +{
>> + BUG();
>> +}
>> +EXPORT_SYMBOL_GPL(x86_BUG);
>
> That export is needed for?
>
> Paravirt stuff in modules?
>
> It builds here without it - I guess I need to do an allmodconfig.
>
It might not be needed now, but are you sure we won't need it in future?
Juergen
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WARNING: multiple messages have this Message-ID (diff)
From: Juergen Gross <jgross@suse.com>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ajay Kaher <akaher@vmware.com>,
Alexey Makhalov <amakhalov@vmware.com>,
VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
xen-devel@lists.xenproject.org,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative
Date: Wed, 25 Oct 2023 15:31:07 +0200 [thread overview]
Message-ID: <fde7ffdd-4d12-4821-ac51-e67e65637111@suse.com> (raw)
In-Reply-To: <20231025103402.GBZTjvGse9c0utZGO0@fat_crate.local>
[-- Attachment #1.1.1: Type: text/plain, Size: 807 bytes --]
On 25.10.23 12:34, Borislav Petkov wrote:
> On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
>> +/* Low-level backend functions usable from alternative code replacements. */
>> +DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
>> +EXPORT_SYMBOL_GPL(x86_nop);
>
> This is all x86 code so you don't really need the "x86_" prefix - "nop"
> is perfectly fine.
There is
#define nop() asm volatile ("nop")
in arch/x86/include/asm/special_insns.h already.
>
>> +noinstr void x86_BUG(void)
>> +{
>> + BUG();
>> +}
>> +EXPORT_SYMBOL_GPL(x86_BUG);
>
> That export is needed for?
>
> Paravirt stuff in modules?
>
> It builds here without it - I guess I need to do an allmodconfig.
>
It might not be needed now, but are you sure we won't need it in future?
Juergen
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next prev parent reply other threads:[~2023-10-25 13:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-19 9:15 [PATCH v3 0/5] x86/paravirt: Get rid of paravirt patching Juergen Gross via Virtualization
2023-10-19 9:15 ` Juergen Gross
2023-10-19 9:15 ` [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative Juergen Gross via Virtualization
2023-10-19 9:15 ` Juergen Gross
2023-10-19 11:33 ` kernel test robot
2023-10-19 11:33 ` kernel test robot
2023-10-25 10:34 ` Borislav Petkov
2023-10-25 10:34 ` Borislav Petkov
2023-10-25 13:31 ` Juergen Gross via Virtualization [this message]
2023-10-25 13:31 ` Juergen Gross
2023-10-25 13:44 ` Borislav Petkov
2023-10-25 13:44 ` Borislav Petkov
2023-10-25 13:57 ` Juergen Gross via Virtualization
2023-10-25 13:57 ` Juergen Gross
2023-10-30 12:39 ` Juergen Gross via Virtualization
2023-10-30 12:39 ` Juergen Gross
2023-10-19 9:15 ` [PATCH v3 2/5] x86/alternative: add indirect call patching Juergen Gross
2023-10-19 9:15 ` [PATCH v3 3/5] x86/paravirt: introduce ALT_NOT_XEN Juergen Gross via Virtualization
2023-10-19 9:15 ` Juergen Gross
2023-10-19 9:15 ` [PATCH v3 4/5] x86/paravirt: switch mixed paravirt/alternative calls to alternative_2 Juergen Gross via Virtualization
2023-10-19 9:15 ` Juergen Gross
2023-10-19 11:55 ` kernel test robot
2023-10-19 11:55 ` kernel test robot
2023-10-26 2:44 ` kernel test robot
2023-10-26 6:33 ` Juergen Gross
2023-10-26 6:33 ` Juergen Gross via Virtualization
2023-10-26 9:02 ` kernel test robot
2023-10-26 9:02 ` kernel test robot
2023-10-19 9:15 ` [PATCH v3 5/5] x86/paravirt: remove no longer needed paravirt patching code Juergen Gross via Virtualization
2023-10-19 9:15 ` Juergen Gross
2023-10-19 12:06 ` kernel test robot
2023-10-19 12:06 ` kernel test robot
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