[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-ia64-devel] [PATCH] fully virtualize psr and ipsr on non-VTI domain
Hi Anthony -- Since things have stabilized, I decided to give this patch some testing, primarily to see if it might fix the gcc segmentation faults that Fujita and I have been seeing. Without this patch, I am able to compile Linux 20 times on domU; generally 1 or 2 of the compiles fails because of the gcc segfault. With the patch, Xen *crashed* on the sixth Linux compile (first try) and halfway through the first Linux compile (second try). This is on a Tiger4, but I currently am not able to get console output so I don't have any information about the crash -- other than that the machine didn't reboot. Could you see if you could reproduce this? As an aside, turning off the FAST_BREAK, FAST_ACCESS_REFLECT, and FAST_RFI features (which your patch turns off) slowed down the benchmark by about 4%. Thanks, Dan > -----Original Message----- > From: Xu, Anthony [mailto:anthony.xu@xxxxxxxxx] > Sent: Sunday, November 27, 2005 8:22 PM > To: Magenheimer, Dan (HP Labs Fort Collins) > Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx > Subject: [Xen-ia64-devel] [PATCH] fully virtualize psr and > ipsr on non-VTI domain > > Dan, > This patch is intended to fully virtualize psr and ipsr on non-VTI > domain. > Following things are done in this patch. > 1, previously when guest reads psr, it always get psr dt rt > it equal to > 1. that is because HV doesn't restore these information, > metaphysical_mode can't present all these information. I save these > information into privregs->vpsr. Thus guest can get correct > information > about dt, rt and it. > 2, when guest reads psr, we should only return low 32bits and > 35 and 36 > bits, previously return all bits. > 3, when guest rsm and ssm psr, HV rsm and ssm some bits of current psr > which is used by HV, that is not correct, guest rsm and ssm > should only > impact guest psr(that is regs->ipsr). > 4, mistakenly uses guest DCR, guest DCR should impact guest psr when > injecting interruption into guest, but not impact guest ipsr. > When injecting interruption into guest,The current implementation is > Guest ipsr.be=guest dcr.be > Guest ipsr.pp=guest dcr.pp > Correct implementation should be, > Guest psr.be=guest dcr.be > Guest psr.pp=guest dcr.pp. > > Because of above modifications, I turn off FAST_RFI, FAST_BREAK and > FAST_ACCESS_REFLECT. > > Signed-off-by Anthony Xu < anthony.xu@xxxxxxxxx> > > One question, why do we need to virtualize guest psr.pp and always set > guest psr.pp to 1? > > Thanks > -Anthony > > > > > > > > > _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel
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