[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] HVM support for e820_host (Was: Bug: Limitation of <=2GB RAM in domU persists with 4.3.0)
On 09/03/2013 10:30 PM, Konrad Rzeszutek Wilk wrote: On Tue, Sep 03, 2013 at 10:24:44PM +0100, Gordan Bobic wrote:On 09/03/2013 10:10 PM, Konrad Rzeszutek Wilk wrote:On Tue, Sep 03, 2013 at 09:49:40PM +0100, Gordan Bobic wrote:I spoke too soon - even with e820_host=0, the same error occurs. What did I break? The code in question is this: if (libxl_defbool_val(d_config->b_info.e820_host)) { ret = libxl__e820_alloc(gc, domid, d_config); if (ret) { LIBXL__LOG_ERRNO(gc->owner, LIBXL__LOG_ERROR, "Failed while collecting E820 with: %d (errno:%d)\n", ret, errno); } } With e820_host=0, that outer black should evaluate to false, should it not? In libxl_create.c, if I am understanding the code correctly, e820_host is defaulted to false, too. What am I missing?Does your config have 'pci' in it? The patch you sent had this: + if (d_config->num_pcidevs) + libxl_defbool_set(&b_info->e820_host, true); Which means that even if you did not have e820_host it will be automatically set if you have PCI devices. OK - that was embarrasing. Caffeine underflow error. :(I backed out that block. I don't think e820_host should be implicit in hvm when PCI devices are passed. That makes the adjusted patch fragment: --- xl_cmdimpl.c.orig 2013-09-04 00:42:57.424337503 +0100 +++ xl_cmdimpl.c 2013-09-04 00:43:21.213886356 +0100 @@ -1293,7 +1293,7 @@ d_config->num_pcidevs++; } if (d_config->num_pcidevs && c_info->type == LIBXL_DOMAIN_TYPE_PV) - libxl_defbool_set(&b_info->u.pv.e820_host, true); + libxl_defbool_set(&b_info->e820_host, true); } switch (xlu_cfg_get_list(config, "cpuid", &cpuids, 0, 1)) {This should maintain the old behaviour for backward compatibility when e820_host is not set. I just tested it and it works (with e820_host=1 I get the previous error, with e820_host=0, everything works fine. I will have a play with the other two patches tomorrow. Gordan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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