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Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative
- To: Borislav Petkov <bp@xxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 25 Oct 2023 15:57:36 +0200
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- Cc: linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ajay Kaher <akaher@xxxxxxxxxx>, Alexey Makhalov <amakhalov@xxxxxxxxxx>, VMware PV-Drivers Reviewers <pv-drivers@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Delivery-date: Wed, 25 Oct 2023 13:57:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.10.23 15:44, Borislav Petkov wrote:
On Wed, Oct 25, 2023 at 03:31:07PM +0200, Juergen Gross wrote:
There is
#define nop() asm volatile ("nop")
in arch/x86/include/asm/special_insns.h already.
Then call it "nop_func" or so.
Okay.
It might not be needed now, but are you sure we won't need it in future?
No, I'm not.
What I'm sure of is: stuff should be added to the kernel only when
really needed. Not in the expectation that it might potentially be
needed at some point.
Will double check whether it is needed now.
Juergen
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