linux-kernel - Re: [PATCH] KVM: VMX: restore vmx

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Message-ID: <047566b9-c2ef-40c7-9a76-caa8607b3f6b@p183>
Date:   Wed, 31 May 2023 22:42:05 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Jon Kohler <jon@...anix.com>, Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: VMX: restore vmx_vmexit alignment

On Wed, May 31, 2023 at 11:20:31AM -0700, Sean Christopherson wrote:
> On Wed, May 31, 2023, Jon Kohler wrote:
> > Commit 8bd200d23ec4 ("KVM: VMX: Flatten __vmx_vcpu_run()") changed
> > vmx_vmexit from SYM_FUNC_START to SYM_INNER_LABEL, accidentally
> > removing 16 byte alignment as SYM_FUNC_START uses SYM_A_ALIGN and
> > SYM_INNER_LABEL does not. Josh mentioned [1] this was unintentional.
> 
> Anyone know if this is this stable material, or just nice to have?

Can this improve vmexit latency? I didn't measure it.