From: Tim Deegan <tim@xen.org>
To: Roger Pau Monne <roger.pau@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>,
xen-devel@lists.xenproject.org, Wei Liu <wl@xen.org>,
Jan Beulich <jbeulich@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [Xen-devel] [PATCH v4 4/7] x86/tlb: introduce a flush guests TLB flag
Date: Thu, 13 Feb 2020 09:02:34 +0000 [thread overview]
Message-ID: <20200213090234.GB10200@deinos.phlegethon.org> (raw)
In-Reply-To: <20200210172829.43604-5-roger.pau@citrix.com>
At 18:28 +0100 on 10 Feb (1581359306), Roger Pau Monne wrote:
> Introduce a specific flag to request a HVM guest TLB flush, which is
> an ASID/VPID tickle that forces a linear TLB flush for all HVM guests.
>
> This was previously unconditionally done in each pre_flush call, but
> that's not required: HVM guests not using shadow don't require linear
> TLB flushes as Xen doesn't modify the guest page tables in that case
> (ie: when using HAP).
>
> Modify all shadow code TLB flushes to also flush the guest TLB, in
> order to keep the previous behavior. I haven't looked at each specific
> shadow code TLB flush in order to figure out whether it actually
> requires a guest TLB flush or not, so there might be room for
> improvement in that regard.
>
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> Reviewed-by: Wei Liu <wl@xen.org>
Acked-by: Tim Deegan <tim@xen.org>
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next prev parent reply other threads:[~2020-02-13 9:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 17:28 [Xen-devel] [PATCH v4 0/7] x86: improve assisted tlb flush and use it in guest mode Roger Pau Monne
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 1/7] x86/hvm: allow ASID flush when v != current Roger Pau Monne
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 2/7] x86/paging: add TLB flush hooks Roger Pau Monne
2020-02-13 9:02 ` Tim Deegan
2020-02-13 9:03 ` Tim Deegan
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 3/7] x86/hap: improve hypervisor assisted guest TLB flush Roger Pau Monne
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 4/7] x86/tlb: introduce a flush guests TLB flag Roger Pau Monne
2020-02-13 9:02 ` Tim Deegan [this message]
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 5/7] x86/tlb: allow disabling the TLB clock Roger Pau Monne
2020-02-10 20:09 ` Wei Liu
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 6/7] xen/guest: prepare hypervisor ops to use alternative calls Roger Pau Monne
2020-02-10 20:10 ` Wei Liu
2020-02-11 9:52 ` Durrant, Paul
2020-02-10 17:28 ` [Xen-devel] [PATCH v4 7/7] x86/tlb: use Xen L0 assisted TLB flush when available Roger Pau Monne
2020-02-10 20:16 ` Wei Liu
2020-02-11 10:34 ` Wei Liu
2020-02-11 14:06 ` Roger Pau Monné
2020-02-11 14:08 ` Wei Liu
2020-02-18 12:42 ` Roger Pau Monné
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