Nested Virtualization: paged real mode

PATCH In review Christoph Egger 1 participant 1 message Apr 15, 2010

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Christoph Egger

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2010-04-15 12:28 UTC #0 lore raw

PATCH 5/18 Nested Virtualization: paged real mode

Signed-off-by Christoph Egger <[email protected]>

Signature · 6 lines

---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
Geschaeftsfuehrer: Andrew Bowd, Thomas M. McCoy, Giuliano Meroni
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

# HG changeset patch
# User cegger
# Date 1271330295 -7200
Allow nested guest to switch into paged realmode.
This is needed to make hvmloader work when we do nested virtualization with xen in xen.

xen/arch/x86/hvm/hvm.c +0 -3

diff -r 891bd80cbed6 -r 96efed7dedaf xen/arch/x86/hvm/hvm.c
@@ -1073,9 +1073,6 @@ int hvm_set_cr0(unsigned long value)
     /* ET is reserved and should be always be 1. */
     value |= X86_CR0_ET;
 
-    if ( (value & (X86_CR0_PE | X86_CR0_PG)) == X86_CR0_PG )
-        goto gpf;
-
     if ( (value & X86_CR0_PG) && !(old_value & X86_CR0_PG) )
     {
         if ( v->arch.hvm_vcpu.guest_efer & EFER_LME )

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