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L0 intercepts VMEXIT_DR7_READ, which disables the intercept for L1 and then restarts L2 which re-executes the instruction and then this repeats indefinitely. Disable the intercept for the current VMCB if in guest mode to reflect what would happen if the VMCB were recreated via nsvm_vmcb_prepare4vmrun(). Fixes: a59a7be91b61 ("nestedsvm: fix DRn handling") Signed-off-by: Ross Lagerwall --- xen/arch/x86/hvm/svm/svm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c index 49fcdd906cf8..209edcba321a 100644 --- a/xen/arch/x86/hvm/svm/svm.c +++ b/xen/arch/x86/hvm/svm/svm.c @@ -1657,6 +1657,8 @@ static void svm_dr_access(struct vcpu *v, struct cpu_user_regs *regs) TRACE(TRC_HVM_DR_WRITE); __restore_debug_registers(vmcb, v); + if ( nestedhvm_enabled(v->domain) && nestedhvm_vcpu_in_guestmode(v) ) + vmcb_set_dr_intercepts(v->arch.hvm.svm.vmcb, 0); } static int cf_check svm_msr_read_intercept( -- 2.53.0