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KVM: x86: Save&restore interrupt shadow mask

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The interrupt shadow created by STI or MOV-SS-like operations is part of
the VCPU state and must be preserved across migration. Transfer it in
the spare padding field of kvm_vcpu_events.interrupt.

As a side effect we now have to make vmx_set_interrupt_shadow robust
against both shadow types being set. Give MOV SS a higher priority and
skip STI in that case to avoid that VMX throws a fault on next entry.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka
2010-02-19 19:38:07 +01:00
committed by Avi Kivity
parent 03b82a30ea
commit 48005f64d0
8 changed files with 34 additions and 14 deletions
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4
arch/x86/kvm/emulate.c
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@@ -2128,7 +2128,7 @@ special_insn:
}
if (c->modrm_reg == VCPU_SREG_SS)
toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS);
toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_MOV_SS);
rc = kvm_load_segment_descriptor(ctxt->vcpu, sel, c->modrm_reg);
@@ -2366,7 +2366,7 @@ special_insn:
if (emulator_bad_iopl(ctxt))
kvm_inject_gp(ctxt->vcpu, 0);
else {
toggle_interruptibility(ctxt, X86_SHADOW_INT_STI);
toggle_interruptibility(ctxt, KVM_X86_SHADOW_INT_STI);
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
}