35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Maxim Levitsky <mlevitsk@redhat.com>
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Date: Wed, 3 Aug 2022 18:50:02 +0300
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Subject: [PATCH] KVM: x86: emulator: update the emulation mode after rsm
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This ensures that RIP will be correctly written back,
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because the RSM instruction can switch the CPU mode from
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32 bit (or less) to 64 bit.
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This fixes a guest crash in case the #SMI is received
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while the guest runs a code from an address > 32 bit.
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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arch/x86/kvm/emulate.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
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index 61b38c03606a..f2a0a34f4687 100644
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--- a/arch/x86/kvm/emulate.c
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+++ b/arch/x86/kvm/emulate.c
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@@ -2653,6 +2653,11 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
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if (ret != X86EMUL_CONTINUE)
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goto emulate_shutdown;
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+
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+ ret = emulator_recalc_and_set_mode(ctxt);
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+ if (ret != X86EMUL_CONTINUE)
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+ goto emulate_shutdown;
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+
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/*
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* Note, the ctxt->ops callbacks are responsible for handling side
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* effects when writing MSRs and CRs, e.g. MMU context resets, CPUID
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