linux-kernel - Re: [PATCH v17 15/35] virt: gunyah: Add proxy-scheduled vCPUs

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Date: Wed, 13 Mar 2024 14:51:33 +0530
From: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To: Elliot Berman <quic_eberman@...cinc.com>
CC: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Carl van Schaik
	<quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Jonathan Corbet
	<corbet@....net>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v17 15/35] virt: gunyah: Add proxy-scheduled vCPUs

* Elliot Berman <quic_eberman@...cinc.com> [2024-02-22 15:16:38]:

> Gunyah allows vCPUs that are configured as proxy-scheduled to be scheduled by
> another virtual machine (host) that holds capabilities to those vCPUs with
> suitable rights.
> 
> Gunyah also supports configuring regions of a proxy-scheduled VM's address
> space to be virtualized by the host VM. This permits a host VMM to emulate MMIO
> devices in the proxy-scheduled VM.
> 
> vCPUs are presented to the host as a Gunyah resource and represented to
> userspace as a Gunyah VM function.
> 
> Creating the vcpu function on the VM will create a file descriptor that:
>  - can handle an ioctl to run the vCPU. When called, Gunyah will directly
>    context-switch to the selected vCPU and run it until one of the following
>    events occurs:
>     * the host vcpu's time slice ends
>     * the host vcpu receives an interrupt or would have been pre-empted
>       by the hypervisor
>     * a fault occurs in the proxy-scheduled vcpu
>     * a power management event, such as idle or cpu-off call in the vcpu
>  - can be mmap'd to share the gunyah_vcpu_run structure with userspace. This
>    allows the vcpu_run result codes to be accessed, and for arguments to
>    vcpu_run to be passed, e.g. for resuming the vcpu when handling certain fault
>    and exit cases.
> 
> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>
> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>

LGTM

Reviewed-by: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>

- vatsa