Date:   Thu, 6 Jan 2022 18:08:15 +0300
From:   "Kirill A. Shutemov" <kirill@shutemov.name>
To:     Josh Poimboeuf <jpoimboe@redhat.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
        dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org,
        sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com,
        ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com,
        hpa@zytor.com, jgross@suse.com, jmattson@google.com,
        joro@8bytes.org, knsathya@kernel.org, pbonzini@redhat.com,
        sdeep@vmware.com, seanjc@google.com, tony.luck@intel.com,
        vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 08/26] x86/tdx: Handle in-kernel MMIO
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 <20211215233116.d2opfoei42viqdty@treble>
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On Wed, Dec 15, 2021 at 03:31:16PM -0800, Josh Poimboeuf wrote:
> > +static int tdx_handle_mmio(struct pt_regs *regs, struct ve_info *ve)
> 
> Similarly, tdx_handle_mmio() returns (int) 0 for success, while other
> tdx_handle_*() functions return (bool) true for success.  Also
> confusing.

Looked at this again, you read it wrong. tdx_handle_mmio() return size of
instruction it handled so we can advance RIP and <= 0 on error. It is
consistent with other #VE handlers that positive (true) on success.

-- 
 Kirill A. Shutemov