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Date:   Tue, 25 Aug 2020 13:04:46 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Joerg Roedel <joro@8bytes.org>
Cc:     x86@kernel.org, Joerg Roedel <jroedel@suse.de>,
        Tom Lendacky <thomas.lendacky@amd.com>, hpa@zytor.com,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Jiri Slaby <jslaby@suse.cz>,
        Dan Williams <dan.j.williams@intel.com>,
        Juergen Gross <jgross@suse.com>,
        Kees Cook <keescook@chromium.org>,
        David Rientjes <rientjes@google.com>,
        Cfir Cohen <cfir@google.com>,
        Erdem Aktas <erdemaktas@google.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Mike Stunes <mstunes@vmware.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Martin Radev <martin.b.radev@gmail.com>,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v6 02/76] KVM: SVM: Add GHCB definitions
Message-ID: <20200825110446.GC12107@zn.tnic>
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 <20200824104451.GA4732@zn.tnic>
 <20200825092224.GF3319@8bytes.org>
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On Tue, Aug 25, 2020 at 11:22:24AM +0200, Joerg Roedel wrote:
> I don't think so, if I look at the history of these checks their whole
> purpose seems to be to alert the developer/maintainer when their size
> changes and that they might not fit on the stack anymore. But that is
> taken care of in patch 1.

Why? What's wrong with:

	BUILD_BUG_ON(sizeof(struct vmcb_save_area) != VMCB_SAVE_AREA_SIZE);
	BUILD_BUG_ON(sizeof(struct vmcb_control_area) != VMCB_CONTROL_AREA_SIZE);
	BUILD_BUG_ON(sizeof(struct ghcb) != PAGE_SIZE);

?

-- 
Regards/Gruss,
    Boris.

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