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    SubjectRe: [PATCH v2 8/9] KVM: x86: add force_intercept_exceptions_mask
    On Thu, Apr 01, 2021 at 04:54:50PM +0300, Maxim Levitsky wrote:
    > This parameter will be used by VMX and SVM code to force
    > interception of a set of exceptions, given by a bitmask
    > for guest debug and/or kvm debug.
    >
    > This option is not intended for production.
    >
    > This is based on an idea first shown here:
    > https://patchwork.kernel.org/project/kvm/patch/20160301192822.GD22677@pd.tnic/
    >
    > CC: Borislav Petkov <bp@suse.de>
    > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
    > ---
    > arch/x86/kvm/x86.c | 3 +++
    > arch/x86/kvm/x86.h | 2 ++
    > 2 files changed, 5 insertions(+)
    >
    > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    > index 3627ce8fe5bb..1a51031d64d8 100644
    > --- a/arch/x86/kvm/x86.c
    > +++ b/arch/x86/kvm/x86.c
    > @@ -176,6 +176,9 @@ module_param(force_emulation_prefix, bool, S_IRUGO);
    > int __read_mostly pi_inject_timer = -1;
    > module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR);
    >
    > +uint force_intercept_exceptions_mask;
    > +module_param(force_intercept_exceptions_mask, uint, S_IRUGO | S_IWUSR);
    > +EXPORT_SYMBOL_GPL(force_intercept_exceptions_mask);

    That's nice.

    I could use some text explaning the usage though, i.e. that thing takes
    a bitfield of exception vectors, so that I don't have to look at the
    code each time. :-)

    Thx.

    --
    Regards/Gruss,
    Boris.

    https://people.kernel.org/tglx/notes-about-netiquette

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