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Re: [Xen-devel] [PATCH v15 07/19] pvh: Disable unneeded features of HVM containers

On 11/12/2013 01:51 PM, Jan Beulich wrote:
On 11.11.13 at 15:57, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
@@ -1414,6 +1442,7 @@ int hvm_hap_nested_page_fault(paddr_t gpa,
      /* For the benefit of 32-bit WinXP (& older Windows) on AMD CPUs,
       * a fast path for LAPIC accesses, skipping the p2m lookup. */
      if ( !nestedhvm_vcpu_in_guestmode(v)
+         && is_hvm_vcpu(v)

This change looks unnecessary - nestedhvm_vcpu_enter_guestmode()
(the only way by which nestedhvm_vcpu_in_guestmode() could return
other than zero) must obviously never be used on a PVH guest.

You've got the polarity of that check wrong -- PVH guests are never in guest mode, therefore !nestedhvm_vcpu_in_guestmode() is always true.


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