linux-kernel - Re: [PATCH v4 21/26] KVM: SVM: Rename vmcb->virt_ext to vmcb->misc

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Message-ID: <aYVEVRV-ASogp5dF@google.com>
Date: Thu, 5 Feb 2026 17:31:01 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Yosry Ahmed <yosry.ahmed@...ux.dev>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 21/26] KVM: SVM: Rename vmcb->virt_ext to vmcb->misc_ctl2

On Thu, Jan 15, 2026, Yosry Ahmed wrote:
> @@ -244,6 +241,8 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
>  #define SVM_MISC_CTL_SEV_ENABLE		BIT(1)
>  #define SVM_MISC_CTL_SEV_ES_ENABLE	BIT(2)
>  
> +#define SVM_MISC_CTL2_LBR_CTL_ENABLE		BIT_ULL(0)
> +#define SVM_MISC_CTL2_V_VMLOAD_VMSAVE_ENABLE	BIT_ULL(1)

Since you're changing names anyways, What do you think about shortening things
a bit, and using the more standard syle of <scope>_<action>_<flag>?  E.g.

  #define SVM_MISC2_ENABLE_LBR_VIRTUALIZATION	BIT_ULL(0)
  #define SVM_MISC2_ENABLE_V_VMLOAD_VMSAVE	BIT_ULL(1)

Yeah, it diverges from many of the other bits in here, but frankly the names in
this file are *awful*.

Actually, maybe that would prompt me to send a cleanup, because the fact that we
have this set of flags is beyond ridiculous (I geniunely don't remember what
V_GIF_MASK tracks, off the top of my head).  And in isolation, I can't remember
iof V_IRQ_MASK is an enable flag or a "IRQs are masked" flagged.

#define V_IRQ_MASK
#define V_INTR_MASKING_MASK
#define V_GIF_MASK
#define V_GIF_ENABLE_MASK