From 0234bf885236a41ef05376039f2a8ebe7028a388 Mon Sep 17 00:00:00 2001 From: Ladi Prosek Date: Wed, 11 Oct 2017 16:54:40 +0200 Subject: KVM: x86: introduce ISA specific SMM entry/exit callbacks Entering and exiting SMM may require ISA specific handling under certain circumstances. This commit adds two new callbacks with empty implementations. Actual functionality will be added in following commits. * pre_enter_smm() is to be called when injecting an SMM, before any SMM related vcpu state has been changed * pre_leave_smm() is to be called when emulating the RSM instruction, when the vcpu is in real mode and before any SMM related vcpu state has been restored Signed-off-by: Ladi Prosek Signed-off-by: Paolo Bonzini --- arch/x86/kvm/emulate.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/x86/kvm/emulate.c') diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index d90cdc77e077..8079d141792a 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2591,6 +2591,15 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt) ctxt->ops->set_msr(ctxt, MSR_EFER, efer); smbase = ctxt->ops->get_smbase(ctxt); + + /* + * Give pre_leave_smm() a chance to make ISA-specific changes to the + * vCPU state (e.g. enter guest mode) before loading state from the SMM + * state-save area. + */ + if (ctxt->ops->pre_leave_smm(ctxt, smbase)) + return X86EMUL_UNHANDLEABLE; + if (emulator_has_longmode(ctxt)) ret = rsm_load_state_64(ctxt, smbase + 0x8000); else -- cgit v1.2.3