From: Juergen Gross <jgross@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: Per Bilse <Per.Bilse@citrix.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
"open list:X86 ENTRY CODE" <linux-kernel@vger.kernel.org>,
"moderated list:XEN HYPERVISOR INTERFACE"
<xen-devel@lists.xenproject.org>
Subject: Re: [PATCH] Updates to Xen hypercall preemption
Date: Thu, 22 Jun 2023 15:35:17 +0200 [thread overview]
Message-ID: <36e256ea-7255-f364-bfac-69c39dc7d447@suse.com> (raw)
In-Reply-To: <e8f0d101-d803-8ccb-80a0-fc7c6c45ab77@citrix.com>
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On 22.06.23 15:05, Andrew Cooper wrote:
> On 22/06/2023 9:26 am, Peter Zijlstra wrote:
>> On Thu, Jun 22, 2023 at 07:22:53AM +0200, Juergen Gross wrote:
>>
>>> The hypercalls we are talking of are synchronous ones. They are running
>>> in the context of the vcpu doing the call (like a syscall from userland is
>>> running in the process context).
>> (so time actually passes from the guest's pov?)
>
> Yes. And in principle it's wired into stolen time.
Sure? I think stolen time is only increased if the vcpu is being descheduled
by Xen. Synchronous hypercalls should be accounted for the calling vcpu.
Juergen
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next prev parent reply other threads:[~2023-06-22 13:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-21 15:14 Per Bilse
2023-06-21 16:27 ` Andy Lutomirski
2023-06-21 19:05 ` Per Bilse
2023-06-21 23:42 ` Andy Lutomirski
2023-06-21 16:40 ` Peter Zijlstra
2023-06-21 19:19 ` Per Bilse
2023-06-21 20:04 ` Peter Zijlstra
2023-06-22 5:22 ` Juergen Gross
2023-06-22 8:26 ` Peter Zijlstra
2023-06-22 10:33 ` Juergen Gross
2023-06-22 11:15 ` Peter Zijlstra
2023-06-22 12:17 ` Juergen Gross
2023-06-22 16:39 ` Andy Lutomirski
2023-06-22 17:20 ` Juergen Gross
2023-06-24 15:19 ` Andy Lutomirski
2023-06-22 13:05 ` Andrew Cooper
2023-06-22 13:14 ` Peter Zijlstra
2023-06-22 13:35 ` Juergen Gross [this message]
2023-06-22 10:01 ` Per Bilse
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