linux-kernel - Re: [PATCH v3 1/4] KVM: SVM: nested: Don't allocate VMCB structures on stack

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Message-ID: <20200803180411.GE3151@linux.intel.com>
Date:   Mon, 3 Aug 2020 11:04:12 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v3 1/4] KVM: SVM: nested: Don't allocate VMCB structures
 on stack

On Mon, Aug 03, 2020 at 02:27:05PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
> 
> Do not allocate a vmcb_control_area and a vmcb_save_area on the stack,
> as these structures will become larger with future extenstions of
> SVM and thus the svm_set_nested_state() function will become a too large
> stack frame.
> 
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
> @@ -1110,15 +1123,15 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
>  	 */
>  	cr0 = kvm_read_cr0(vcpu);
>          if (((cr0 & X86_CR0_CD) == 0) && (cr0 & X86_CR0_NW))
> -                return -EINVAL;
> +                goto out_free;

Pre-existing issue, but this could opportunistically fix a spaces vs. tabs
issue.

ERROR: code indent should use tabs where possible
#71: FILE: arch/x86/kvm/svm/nested.c:1126:
+                goto out_free;$

WARNING: please, no spaces at the start of a line
#71: FILE: arch/x86/kvm/svm/nested.c:1126:
+                goto out_free;$