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    SubjectRe: [PATCH v4 2/5] KVM: X86: Expose PKS to guest
    On Fri, Feb 05, 2021 at 10:25:48AM +0100, Paolo Bonzini wrote:
    > On 05/02/21 09:37, Chenyi Qiang wrote:
    > >
    > > diff --git a/arch/x86/mm/pkeys.c b/arch/x86/mm/pkeys.c
    > > index 57718716cc70..8027f854c600 100644
    > > --- a/arch/x86/mm/pkeys.c
    > > +++ b/arch/x86/mm/pkeys.c
    > > @@ -390,3 +390,9 @@ void pks_key_free(int pkey)
    > > __clear_bit(pkey, &pks_key_allocation_map);
    > > }
    > > EXPORT_SYMBOL_GPL(pks_key_free);
    > > +
    > > +u32 get_current_pkrs(void)
    > > +{
    > > + return this_cpu_read(pkrs_cache);
    > > +}
    > > +EXPORT_SYMBOL_GPL(get_current_pkrs);
    > > diff --git a/include/linux/pkeys.h b/include/linux/pkeys.h
    > > index bed0e293f13b..480429020f4c 100644
    > > --- a/include/linux/pkeys.h
    > > +++ b/include/linux/pkeys.h
    > > @@ -72,6 +72,10 @@ static inline void pks_mk_readwrite(int pkey)
    > > {
    > > pr_err("%s is not valid without PKS support\n", __func__);
    > > }
    > > +static inline u32 get_current_pkrs(void)
    > > +{
    > > + return 0;
    > > +}
    > > #endif /* ! CONFIG_ARCH_HAS_SUPERVISOR_PKEYS */
    >
    > This would need an ack from the x86 people. Andy, Boris?

    This looks like the PKS baremetal pile needs to be upstream first.

    --
    Regards/Gruss,
    Boris.

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

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