From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>, Michal Luczaj <mhal@rbox.co>
Cc: kvm@vger.kernel.org, shuah@kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [kvm-unit-tests PATCH 2/4] x86: emulator.c cleanup: Use ASM_TRY for the UD_VECTOR cases
Date: Fri, 5 Aug 2022 13:42:40 +0200 [thread overview]
Message-ID: <ae0a0049-8db0-501b-79e4-cd32758156fb@redhat.com> (raw)
In-Reply-To: <Yuq8mumnrww9rlnz@google.com>
On 8/3/22 20:21, Sean Christopherson wrote:
>> I've noticed test_illegal_movbe() does not execute with KVM_FEP.
>> Just making sure: is it intentional?
> It's intentional. FEP isn't needed because KVM emulates MOVBE on #UD when it's
> not supported by the host, e.g. to allow migrating to an older host.
>
> GP(EmulateOnUD | ModRM, &three_byte_0f_38_f0),
> GP(EmulateOnUD | ModRM, &three_byte_0f_38_f1),
>
*puts historian hat on*
The original reason was to test Linux using MOVBE even on non-Atom
machines, when MOVBE was only on Atoms. :)
Paolo
next prev parent reply other threads:[~2022-08-05 11:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-29 13:48 [PATCH 1/2] KVM: x86: emulator: Fix illegal LEA handling Michal Luczaj
2022-07-29 13:48 ` [PATCH 2/2] KVM: selftests: x86: Test " Michal Luczaj
2022-07-29 16:53 ` Sean Christopherson
2022-07-31 20:43 ` Michal Luczaj
2022-07-31 20:46 ` [kvm-unit-tests PATCH v2] " Michal Luczaj
2022-08-01 16:44 ` Sean Christopherson
2022-08-02 23:07 ` Michal Luczaj
2022-08-02 23:41 ` Sean Christopherson
2022-08-03 17:21 ` Michal Luczaj
2022-08-03 17:25 ` [kvm-unit-tests PATCH 1/4] x86: emulator.c cleanup: Save and restore exception handlers Michal Luczaj
2022-08-03 17:25 ` [kvm-unit-tests PATCH 2/4] x86: emulator.c cleanup: Use ASM_TRY for the UD_VECTOR cases Michal Luczaj
2022-08-03 18:21 ` Sean Christopherson
2022-08-05 11:42 ` Paolo Bonzini [this message]
2022-08-05 18:55 ` Michal Luczaj
2022-08-05 19:59 ` Sean Christopherson
2022-08-06 2:00 ` Nadav Amit
2022-08-06 11:08 ` Michal Luczaj
2022-08-03 17:25 ` [kvm-unit-tests PATCH 3/4] x86: Test emulator's handling of LEA with /reg Michal Luczaj
2022-08-03 17:25 ` [kvm-unit-tests PATCH 4/4] x86: Extend ASM_TRY to handle #UD thrown by FEP-triggered emulator Michal Luczaj
2022-08-03 18:16 ` Sean Christopherson
2022-08-05 11:50 ` Paolo Bonzini
2022-07-29 16:41 ` [PATCH 1/2] KVM: x86: emulator: Fix illegal LEA handling Sean Christopherson
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