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KVM: x86: emulator: update the emulation mode after rsm

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commit 055f37f84e upstream.

Update the emulation mode after RSM so that RIP will be correctly
written back, because the RSM instruction can switch the CPU mode from
32 bit (or less) to 64 bit.

This fixes a guest crash in case the #SMI is received while the guest
runs a code from an address > 32 bit.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221025124741.228045-13-mlevitsk@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxim Levitsky
2022-10-25 15:47:30 +03:00
committed by Greg Kroah-Hartman
parent 9df4bb7b38
commit 942aec252b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/emulate.c
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@@ -2646,7 +2646,7 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
* those side effects need to be explicitly handled for both success
* and shutdown.
*/
return X86EMUL_CONTINUE;
return emulator_recalc_and_set_mode(ctxt);
emulate_shutdown:
ctxt->ops->triple_fault(ctxt);