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[Xen-devel] Why CR0.WP is always set in HVM domain
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Why CR0.WP is always set in HVM domain |
| From: | "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
| Date: | Thu, 8 Nov 2007 22:23:03 +0800 |
| Delivery-date: | Thu, 08 Nov 2007 06:23:45 -0800 |
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| Thread-index: | AcgiEt9W5+JjfWKHQJ2PRjRqeHa4uw== |
| Thread-topic: | Why CR0.WP is always set in HVM domain |
In "arch/x86/hvm/vmx/vmx.c", vmx_update_guest_cr(), the CR0.WP is always
set as following code:
v->arch.hvm_vcpu.hw_cr[0] =
v->arch.hvm_vcpu.guest_cr[0] |
X86_CR0_PE | X86_CR0_NE | X86_CR0_PG | X86_CR0_WP;
I'm wondering are there any special reason for this? I try to check
shadow code and didn't find any clue.
Can anyone give me some hints?
Thanks
Yunhong Jiang
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