linux-kernel - Re: [Xen-devel] [PATCH v2] xen/balloon: Mark unallocated host memory as UNUSABLE

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Date:   Tue, 19 Dec 2017 10:21:24 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <JBeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     christian.koenig@....com, helgaas@...nel.org,
        xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v2] xen/balloon: Mark unallocated host memory
 as UNUSABLE

On 19/12/17 09:23, Jan Beulich wrote:
>>>> On 18.12.17 at 23:22, <boris.ostrovsky@...cle.com> wrote:
>> +void __init arch_xen_balloon_init(struct resource *hostmem_resource)
>> +{
>> +	struct xen_memory_map memmap;
>> +	int rc;
>> +	unsigned int i, last_guest_ram;
>> +	phys_addr_t max_addr = max_pfn << PAGE_SHIFT;
> 
> PFN_PHYS() as right now you still have an issue on 32-bit.

Why? PFN_PHYS is defined as:

#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)


Juergen