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Re: Wake-up from suspend to RAM broken under `retbleed=stuff`
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Jan 2023 12:45:39 +0100
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- Cc: "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Joan Bruguera <joanbrugueram@xxxxxxxxx>
- Delivery-date: Wed, 11 Jan 2023 11:45:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.01.2023 12:39, Andrew Cooper wrote:
> The bigger issue with stuff accounting is that nothing AFAICT accounts
> for the fact that any hypercall potentially empties the RSB in otherwise
> synchronous program flow.
But that's not just at hypercall boundaries, but effectively anywhere
(i.e. whenever the hypervisor decides to de-schedule the vCPU)?
Jan
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