Re: [Xen-users] DomU sees only 512MB RAM with PCI-passthrough

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, May 22, 2013 at 05:17:52PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, May 22, 2013 at 05:15:37PM -0400, Konrad Rzeszutek Wilk wrote:
> > On Wed, May 22, 2013 at 05:06:18PM -0400, Konrad Rzeszutek Wilk wrote:
> > > On Thu, Dec 20, 2012 at 01:40:38PM +0100, Christian Holpert wrote:
> > > > Hello,
> > > > 
> > > > the output of xl -vvv create is attached for xen 4.2.1 with PCI and
> > > > without PCI.
> > > 
> > > Could you also attach the host dmesg please?
> > 
> > Nevermind. I can reproduce it. The interesting thing is that initially I had
> > this in my guest config:
> > 
> > maxmem=2048
> > memory=1024
> > 
> > and the output of the tools told me:
> > Memory: 1048576kB End of RAM: 0x20000 (PFN) Delta: 524288kB, PCI start: 
> > 524288kB (0x20000 PFN), Balloon 1048576kB
> > 
> > .. and then it added that 1G to the end:
> > 
> > libxl_x86.c:201:e820_sanitize: :  [100000 -> 160000] RAM
> > 
> > and the guest booted nicely.
> > 
> > But if maxmem=memory I get:
> > 
> > Memory: 2097152kB End of RAM: 0x20000 (PFN) Delta: 1572864kB, PCI start: 
> > 524288kB (0x20000 PFN), Balloon 0kB
> > 
> > And of course no E820 entry at 4G and guest crashes.
> 
> Pff, try this patch please:
> 
> diff --git a/tools/libxl/libxl_x86.c b/tools/libxl/libxl_x86.c
> index a17f6ae..a78c91d 100644
> --- a/tools/libxl/libxl_x86.c
> +++ b/tools/libxl/libxl_x86.c
> @@ -182,7 +182,7 @@ static int e820_sanitize(libxl_ctx *ctx, struct e820entry 
> src[],
>          idx++;
>      }
>      /* At this point we have the mapped RAM + E820 entries from src. */
> -    if (balloon_kb) {
> +    if (balloon_kb || delta_kb) {
>          /* and if we truncated the RAM region, then add it to the end. */
>          e820[idx].type = E820_RAM;
>          e820[idx].addr = (uint64_t)(1ULL << 32) > last ?
> 
> (I am heading out for today and will retry it tomorrow, but I am 99%
> that is the culprit).

And it works. Will send out a patch shortly.

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