From: Juergen Gross <jgross@suse.com>
To: Teddy Astie <teddy.astie@vates.tech>, xen-devel@lists.xenproject.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
David Woodhouse <dwmw2@infradead.org>,
George Dunlap <gwd@xenproject.org>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 7/8] x86/xen/time: Use VCPUOP_register_{runstate,vcpu_time}_phys_area when available
Date: Wed, 11 Nov 2026 08:39:56 +0100 [thread overview]
Message-ID: <54662152-d3f3-45f7-a904-007809efc201@suse.com> (raw)
In-Reply-To: <1792170398.8631fc262581453bbf619ec5b2062170.1a145ae12660008425@vates.tech>
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On 16.10.26 19:06, Teddy Astie wrote:
> Updating these area can be expensive when done through virtual addresses
> (especially for runstate one), in particular for HVM/PVH guests.
> Xen 4.18 introduced physical address alternatives to address those
> short-commings, but they aren't used currently.
>
> Fix it by using these alternatives when available (when reported in
> XENFEAT_{runstate,vcpu_time}_phys_area.
>
> Assisted-by: LLM
> [guidance and testing]
> Signed-off-by: Teddy Astie <teddy.astie@vates.tech>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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next prev parent reply other threads:[~2026-11-11 7:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1792170295.8631fc262581453bbf619ec5b2062170.1a145ac82530008425@vates.tech>
[not found] ` <1792170392.8631fc262581453bbf619ec5b2062170.1a145adfbff0008425@vates.tech>
2026-10-16 17:33 ` [PATCH v2 1/8] x86/xen/pv: Don't setup runstate area too early Andrew Cooper
2026-10-16 18:04 ` Andrew Cooper
2026-10-19 9:06 ` Teddy Astie
2026-10-19 9:20 ` Teddy Astie
2026-11-11 7:44 ` Juergen Gross
[not found] ` <20261016170613.173406-2-teddy.astie@vates.tech>
[not found] ` <1792170394.8631fc262581453bbf619ec5b2062170.1a145ae01ed0008425@vates.tech>
2026-11-11 6:36 ` [PATCH v2 2/8] xen: Refactor xen/features{.c,.h} Juergen Gross
[not found] ` <1792170395.8631fc262581453bbf619ec5b2062170.1a145ae07870008425@vates.tech>
2026-11-11 6:48 ` [PATCH v2 3/8] xen: Add gpa conversion helpers Juergen Gross
[not found] ` <1792170396.8631fc262581453bbf619ec5b2062170.1a145ae0a4a0008425@vates.tech>
2026-11-11 6:49 ` [PATCH v2 4/8] x86/xen/time: Correct xen_save_time_memory_area() failure message Juergen Gross
[not found] ` <1792170396.8631fc262581453bbf619ec5b2062170.1a145ae0c950008425@vates.tech>
2026-11-11 6:59 ` [PATCH v2 5/8] x86/xen/time: Clear xen_clock mapping later Juergen Gross
[not found] ` <1792170397.8631fc262581453bbf619ec5b2062170.1a145ae0f160008425@vates.tech>
2026-11-11 7:00 ` [PATCH v2 6/8] x86/xen/time: Mark xen_setup_vsyscall_time_info() __init Juergen Gross
[not found] ` <1792170398.8631fc262581453bbf619ec5b2062170.1a145ae12660008425@vates.tech>
2026-11-11 7:39 ` Juergen Gross [this message]
[not found] ` <1792170399.8631fc262581453bbf619ec5b2062170.1a145ae179d0008425@vates.tech>
2026-11-11 7:42 ` [RFC PATCH v2 8/8] xen/sysfs: Honor cached xen_features instead Juergen Gross
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