linux-kernel - Re: [PATCH v4 12/15] pci: Mark MSI data shared

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Message-ID: <YRYoVBIXZ/910eaq@infradead.org>
Date:   Fri, 13 Aug 2021 09:07:48 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Richard Henderson <rth@...ddle.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        James E J Bottomley <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 12/15] pci: Mark MSI data shared

On Wed, Aug 04, 2021 at 05:52:15PM -0700, Kuppuswamy Sathyanarayanan wrote:
>  
> -	return ioremap(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
> +	return ioremap_shared(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);

Please add a comment here.  I also find the amount of ioremap_* variants
rather frustrating.  Maybe it it is time for a ioremap_flags which
replaces the too-lowlevel pgprot_t of the ioremap_prot provided by some
architectures with a more highlevel flags arguments that could also
provide an accessible to the hypervisor flag.