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Subject: Re: [RFC PATCH v4 5/7] xen/pvh: Move Xen code for getting mem map via
 hcall out of common file
To:     Maran Wilson <maran.wilson@oracle.com>, pbonzini@redhat.com,
        boris.ostrovsky@oracle.com, roger.pau@citrix.com,
        andrew.cooper3@citrix.com, hch@infradead.org, JBeulich@suse.com,
        x86@kernel.org, xen-devel@lists.xenproject.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
        rkrcmar@redhat.com, jpoimboe@redhat.com, bp@suse.de,
        kirill.shutemov@linux.intel.com, thomas.lendacky@amd.com,
        luto@kernel.org, dave.hansen@linux.intel.com, davem@davemloft.net,
        gregkh@linuxfoundation.org, mchehab@kernel.org,
        linus.walleij@linaro.org, rdunlap@infradead.org
References: <1519842483-8887-1-git-send-email-maran.wilson@oracle.com>
 <1519842483-8887-6-git-send-email-maran.wilson@oracle.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <7095f9f1-c8b5-acae-44b4-4699a1e67c69@suse.com>
Date:   Thu, 1 Mar 2018 08:21:47 +0100
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On 28/02/18 19:28, Maran Wilson wrote:
> We need to refactor PVH entry code so that support for other hypervisors
> like Qemu/KVM can be added more easily.
> 
> The original design for PVH entry in Xen guests relies on being able to
> obtain the memory map from the hypervisor using a hypercall. When we
> extend the PVH entry ABI to support other hypervisors like Qemu/KVM,
> a new mechanism will be added that allows the guest to get the memory
> map without needing to use hypercalls.
> 
> For Xen guests, the hypercall approach will still be supported. In
> preparation for adding support for other hypervisors, we can move the
> code that uses hypercalls into the Xen specific file. This will allow us
> to compile kernels in the future without CONFIG_XEN that are still capable
> of being booted as a Qemu/KVM guest via the PVH entry point.
> 
> Signed-off-by: Maran Wilson <maran.wilson@oracle.com>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen