x86/sev-es: Correctly track IRQ states in runtime #VC handler
Call irqentry_nmi_enter()/irqentry_nmi_exit() in the #VC handler to
correctly track the IRQ state during its execution.
Fixes: 0786138c78
("x86/sev-es: Add a Runtime #VC Exception Handler")
Reported-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org # v5.10+
Link: https://lkml.kernel.org/r/20210303141716.29223-5-joro@8bytes.org
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545ac14c16
Коммит
62441a1fb5
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@ -1258,13 +1258,12 @@ static __always_inline bool on_vc_fallback_stack(struct pt_regs *regs)
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DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
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{
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struct sev_es_runtime_data *data = this_cpu_read(runtime_data);
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irqentry_state_t irq_state;
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struct ghcb_state state;
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struct es_em_ctxt ctxt;
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enum es_result result;
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struct ghcb *ghcb;
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lockdep_assert_irqs_disabled();
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/*
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* Handle #DB before calling into !noinstr code to avoid recursive #DB.
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*/
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@ -1273,6 +1272,8 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
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return;
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}
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irq_state = irqentry_nmi_enter(regs);
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lockdep_assert_irqs_disabled();
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instrumentation_begin();
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/*
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@ -1335,6 +1336,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
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out:
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instrumentation_end();
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irqentry_nmi_exit(regs, irq_state);
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return;
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