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Re: [Xen-devel] question about system call mechanism in xen
| To: | "Zang Hongyong" <zanghongyong@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] question about system call mechanism in xen |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Mon, 17 Mar 2008 14:57:46 +0000 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 17 Mar 2008 07:57:25 -0700 |
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>>> "Zang Hongyong" <zanghongyong@xxxxxxxxxx> 17.03.08 15:02 >>> >hi, > I'm interested in system call mechanism in Xen. My understanding (guess) as > follows. > 1)When user application makes a system call, a "int 80" will occur. > 2)Then trap to Ring 0 (Which is hypervisor's location). > 3)Then hypervisor redirect it to Guest OS's kernel to do system call > operation. > 4)Then back to Ring 0 > 5)back to user appliction > > Is that true? If everything is 32-bit, "int 80" will be used, but it'll be directed directly to the guest kernel in ring 1 (i.e. the hypervisor isn't involved). If the hypervisor is 64-bit, things behave differently based upon what kind of kernel/app you're running and whether it's a AMD or Intel CPUs the system is equipped with. > Where can I get documents about this question in detail? Source code is probably the only reference. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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