From bf2761690b46d06c50c6ad2cfb28e1116c7ed4c3 Mon Sep 17 00:00:00 2001 From: Tim Deegan Date: Thu, 4 Oct 2012 14:20:50 +0100 Subject: [PATCH] x86/nested-svm: Update the paging mode on VMRUN and VMEXIT emulation. This allows Xen to walk the l1 hypervisor's shadow pagetable correctly. Not needed for hap-on-hap guests because they are handled at lookup time. Problem found with 64bit Win7 and 32bit XPMode where Win7 switches forth and back between long mode and PAE legacy pagetables. Signed-off-by: Christoph Egger [Adjusted to update in all cases where the l1 vmm uses shadows] Signed-off-by: Tim Deegan Committed-by: Tim Deegan --- xen/arch/x86/hvm/svm/nestedsvm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c index b56f92e3d3..9f69bcc70f 100644 --- a/xen/arch/x86/hvm/svm/nestedsvm.c +++ b/xen/arch/x86/hvm/svm/nestedsvm.c @@ -741,6 +741,10 @@ nsvm_vcpu_vmrun(struct vcpu *v, struct cpu_user_regs *regs) return 1; } + /* If l1 guest uses shadow paging, update the paging mode. */ + if (!nestedhvm_paging_mode_hap(v)) + paging_update_paging_modes(v); + nv->nv_vmswitch_in_progress = 0; return 0; } @@ -1408,6 +1412,10 @@ nestedsvm_vcpu_vmexit(struct vcpu *v, struct cpu_user_regs *regs, */ rc = nhvm_vcpu_vmexit(v, regs, exitcode); + /* If l1 guest uses shadow paging, update the paging mode. */ + if (!nestedhvm_paging_mode_hap(v)) + paging_update_paging_modes(v); + nv->nv_vmswitch_in_progress = 0; if (rc) -- 2.30.2