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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
This commit is contained in:
Joerg Roedel 2021-03-03 15:17:15 +01:00 committed by Borislav Petkov
parent 545ac14c16
commit 62441a1fb5
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/sev-es.c
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@ -1258,13 +1258,12 @@ static __always_inline bool on_vc_fallback_stack(struct pt_regs *regs)
DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
{
struct sev_es_runtime_data *data = this_cpu_read(runtime_data);
irqentry_state_t irq_state;
struct ghcb_state state;
struct es_em_ctxt ctxt;
enum es_result result;
struct ghcb *ghcb;
lockdep_assert_irqs_disabled();
/*
* Handle #DB before calling into !noinstr code to avoid recursive #DB.
*/
@ -1273,6 +1272,8 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
return;
}
irq_state = irqentry_nmi_enter(regs);
lockdep_assert_irqs_disabled();
instrumentation_begin();
/*
@ -1335,6 +1336,7 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
out:
instrumentation_end();
irqentry_nmi_exit(regs, irq_state);
return;