Ray Of Hope

February, 2016

Thinking perspective: debugging a crash

Many times its not possible to reproduce a crash that happened in customer environment, talking specifically of kernel or hypervisor or other low level crashes. So few things to keep in mind: 1) Analyze the log trying to find traces that can hint at what may be happening :Core dumps, debug traces 2) Thinking what […]

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Braindump + Segmentation and Paging And Xen

32 bit PV guest: guest kernel executes in ring 1 and guest user space executes in ring3. 64 bit PV guest: Guest kernel executes in ring 3 and guest user space also executes in ring 3. In 32 bit PV guest Xen used to use Segmentation based protection to protect Xen memory from being accessed […]

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Posted in Linux Kernel, Xen | No Comments »