From: Andy Lutomirski <luto@kernel.org>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>,
Borislav Petkov <bpetkov@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Nadav Amit <nadav.amit@gmail.com>, Rik van Riel <riel@redhat.com>,
Juergen Gross <jgross@suse.com>
Subject: Re: [RFC 10/11] x86/mm: Enable CR4.PCIDE on supported systems
Date: Tue, 6 Jun 2017 14:35:46 -0700 [thread overview]
Message-ID: <CALCETrVYnoE5orTr9DpcXxKWYhWAVhkL3sP3_Rdd-8L0-H0tjg@mail.gmail.com> (raw)
In-Reply-To: <a5226797-87b7-ee00-e81d-793b7dc92a80@oracle.com>
On Tue, Jun 6, 2017 at 2:31 PM, Boris Ostrovsky
<boris.ostrovsky@oracle.com> wrote:
>
>> --- a/arch/x86/xen/setup.c
>> +++ b/arch/x86/xen/setup.c
>> @@ -1037,6 +1037,12 @@ void __init xen_arch_setup(void)
>> }
>> #endif
>>
>> + /*
>> + * Xen would need some work to support PCID: CR3 handling as well
>> + * as xen_flush_tlb_others() would need updating.
>> + */
>> + setup_clear_cpu_cap(X86_FEATURE_PCID);
>
>
> Capabilities for PV guests are typically set in xen_init_capabilities() now.
Do I need this just for PV or for all Xen guests? Do the
hardware-assisted guests still use paravirt flushes? Does the
hypervisor either support PCID or correctly clear the PCID CPUID bit?
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next prev parent reply other threads:[~2017-06-06 21:36 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-05 22:36 [RFC 00/11] PCID and improved laziness Andy Lutomirski
2017-06-05 22:36 ` [RFC 01/11] x86/ldt: Simplify LDT switching logic Andy Lutomirski
2017-06-05 22:40 ` Linus Torvalds
2017-06-05 22:44 ` Andy Lutomirski
2017-06-05 22:51 ` Linus Torvalds
2017-06-05 22:36 ` [RFC 02/11] x86/mm: Remove reset_lazy_tlbstate() Andy Lutomirski
2017-06-05 22:36 ` [RFC 03/11] x86/mm: Give each mm TLB flush generation a unique ID Andy Lutomirski
2017-06-05 22:36 ` [RFC 04/11] x86/mm: Track the TLB's tlb_gen and update the flushing algorithm Andy Lutomirski
2017-06-06 5:03 ` Nadav Amit
2017-06-06 22:45 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 05/11] x86/mm: Rework lazy TLB mode and TLB freshness tracking Andy Lutomirski
2017-06-06 1:39 ` Nadav Amit
2017-06-06 21:23 ` Andy Lutomirski
2017-06-06 19:11 ` Rik van Riel
2017-06-06 21:34 ` Andy Lutomirski
2017-06-07 3:33 ` Rik van Riel
2017-06-07 4:54 ` Andy Lutomirski
2017-06-07 5:11 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 06/11] x86/mm: Stop calling leave_mm() in idle code Andy Lutomirski
2017-06-05 22:36 ` [RFC 07/11] x86/mm: Disable PCID on 32-bit kernels Andy Lutomirski
2017-06-05 22:36 ` [RFC 08/11] x86/mm: Add nopcid to turn off PCID Andy Lutomirski
2017-06-06 3:22 ` Andi Kleen
2017-06-14 4:52 ` Andy Lutomirski
2017-06-14 9:51 ` Borislav Petkov
2017-06-05 22:36 ` [RFC 09/11] x86/mm: Teach CR3 readers about PCID Andy Lutomirski
2017-06-05 22:36 ` [RFC 10/11] x86/mm: Enable CR4.PCIDE on supported systems Andy Lutomirski
2017-06-06 21:31 ` Boris Ostrovsky
2017-06-06 21:35 ` Andy Lutomirski [this message]
2017-06-06 21:48 ` Boris Ostrovsky
2017-06-06 21:54 ` Andy Lutomirski
2017-06-05 22:36 ` [RFC 11/11] x86/mm: Try to preserve old TLB entries using PCID Andy Lutomirski
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