linux-kernel - [PATCH 0/2] KVM: x86: Rep string I/O WARN removal and test

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Date:   Mon, 25 Oct 2021 13:13:09 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] KVM: x86: Rep string I/O WARN removal and test

Remove a WARN that was added as part of the recent I/O overhaul to play
nice with SEV-ES string I/O.

For the record, my FIXME in lieu of a WARN was deliberate, as I suspected
userspace could trigger a WARN ;-)

Based on kvm/master, commit 95e16b4792b0 ("KVM: SEV-ES: go over the
sev_pio_data buffer in multiple passes if needed").

Sean Christopherson (2):
  KVM: x86: Don't WARN if userspace mucks with RCX during string I/O
    exit
  KVM: selftests: Add test to verify KVM doesn't explode on "bad" I/O

 arch/x86/kvm/x86.c                            |   9 +-
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../selftests/kvm/x86_64/userspace_io_test.c  | 114 ++++++++++++++++++
 4 files changed, 123 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/userspace_io_test.c

-- 
2.33.0.1079.g6e70778dc9-goog