From: Wei Liu <wl@xen.org>
To: Roger Pau Monne <roger.pau@citrix.com>
Cc: Wei Liu <wl@xen.org>, George Dunlap <george.dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tim Deegan <tim@xen.org>, Jan Beulich <jbeulich@suse.com>,
xen-devel@lists.xenproject.org
Subject: Re: [Xen-devel] [PATCH v3 5/7] x86/tlb: introduce a flush guests TLB flag
Date: Thu, 6 Feb 2020 12:59:07 +0000 [thread overview]
Message-ID: <20200206125907.5sr2egtkvq5qggks@debian> (raw)
In-Reply-To: <20200127181115.82709-6-roger.pau@citrix.com>
On Mon, Jan 27, 2020 at 07:11:13PM +0100, 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>
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next prev parent reply other threads:[~2020-02-06 12:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-27 18:11 [Xen-devel] [PATCH v3 0/7] x86: improve assisted tlb flush and use it in guest mode Roger Pau Monne
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 1/7] x86/tlb: fix NEED_FLUSH return type Roger Pau Monne
2020-01-28 14:17 ` Wei Liu
2020-02-03 11:48 ` Jan Beulich
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 2/7] x86/hvm: allow ASID flush when v != current Roger Pau Monne
2020-02-06 11:15 ` Wei Liu
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 3/7] x86/paging: add TLB flush hooks Roger Pau Monne
2020-02-05 20:52 ` Wei Liu
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 4/7] x86/hap: improve hypervisor assisted guest TLB flush Roger Pau Monne
2020-02-06 11:23 ` Wei Liu
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 5/7] x86/tlb: introduce a flush guests TLB flag Roger Pau Monne
2020-02-06 12:59 ` Wei Liu [this message]
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 6/7] x86/tlb: allow disabling the TLB clock Roger Pau Monne
2020-02-06 13:31 ` Wei Liu
2020-02-06 13:46 ` Roger Pau Monné
2020-01-27 18:11 ` [Xen-devel] [PATCH v3 7/7] x86/tlb: use Xen L0 assisted TLB flush when available Roger Pau Monne
2020-01-28 14:17 ` Wei Liu
2020-01-28 14:57 ` Roger Pau Monné
2020-01-28 16:24 ` Wei Liu
2020-01-28 17:16 ` Roger Pau Monné
2020-01-28 17:20 ` Andrew Cooper
2020-01-28 17:38 ` Roger Pau Monné
2020-02-06 13:49 ` Wei Liu
2020-02-06 14:09 ` Roger Pau Monné
2020-02-06 14:46 ` Jan Beulich
2020-02-06 15:37 ` Roger Pau Monné
2020-02-05 16:14 ` [Xen-devel] [PATCH v3 0/7] x86: improve assisted tlb flush and use it in guest mode Roger Pau Monné
2020-02-05 16:44 ` Jan Beulich
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