linux-kernel - Re: [PATCH v4 2/5] KVM: X86: Expose PKS to guest

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Date:   Fri, 5 Feb 2021 11:10:43 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Chenyi Qiang <chenyi.qiang@...el.com>,
        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>,
        Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v4 2/5] KVM: X86: Expose PKS to guest

On 05/02/21 10:56, Borislav Petkov wrote:
> 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.

Yes, it does.  I would like to have an ack for including the above two 
hunks once PKS is upstream.

I also have CET and bus lock #DB queued and waiting for the bare metal 
functionality, however they do not touch anything outside arch/x86/kvm.

Paolo