linux-kernel - Re: [PATCH RFC v7 52/64] KVM: SVM: Provide support for SNP_GUEST

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Message-ID: <52e31e39-e384-3c5e-307c-652926275099@linux.ibm.com>
Date:   Thu, 19 Jan 2023 23:06:25 +0200
From:   Dov Murik <dovmurik@...ux.ibm.com>
To:     "Kalra, Ashish" <ashish.kalra@....com>,
        Dionna Amalie Glaze <dionnaglaze@...gle.com>,
        Michael Roth <michael.roth@....com>
Cc:     kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        jroedel@...e.de, thomas.lendacky@....com, hpa@...or.com,
        ardb@...nel.org, pbonzini@...hat.com, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        luto@...nel.org, dave.hansen@...ux.intel.com, slp@...hat.com,
        pgonda@...gle.com, peterz@...radead.org,
        srinivas.pandruvada@...ux.intel.com, rientjes@...gle.com,
        tobin@....com, bp@...en8.de, vbabka@...e.cz, kirill@...temov.name,
        ak@...ux.intel.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
        dgilbert@...hat.com, jarkko@...nel.org, harald@...fian.com,
        Brijesh Singh <brijesh.singh@....com>,
        Dov Murik <dovmurik@...ux.ibm.com>
Subject: Re: [PATCH RFC v7 52/64] KVM: SVM: Provide support for
 SNP_GUEST_REQUEST NAE event



On 19/01/2023 22:54, Kalra, Ashish wrote:
> 
> On 1/19/2023 2:35 PM, Dionna Amalie Glaze wrote:
>>> +
>>> +static void snp_handle_guest_request(struct vcpu_svm *svm, gpa_t
>>> req_gpa, gpa_t resp_gpa)
>>> +{
>>
>> Both regular,
>>
>>> +
>>> +static void snp_handle_ext_guest_request(struct vcpu_svm *svm, gpa_t
>>> req_gpa, gpa_t resp_gpa)
>>> +{
>>
>> and extended guest requests should be subject to rate limiting, since
>> they take a lock on the shared resource that is the AMD-SP (psp?). I
>> proposed a mechanism with empirically chosen defaults in
>>
>> [PATCH v2 0/2] kvm: sev: Add SNP guest request throttling
>> [PATCH v2 1/2] kvm: sev: Add SEV-SNP guest request throttling
>> [PATCH v2 2/2] kvm: sev: If ccp is busy, report throttled to guest
>>
>> http://129.79.113.48/hypermail/linux/kernel/2211.2/03107.html
>> http://129.79.113.48/hypermail/linux/kernel/2211.2/03110.html
>> http://129.79.113.48/hypermail/linux/kernel/2211.2/03111.html
>>
>> But I don't see these on lore. Would you like me to repost these?
>>
> 
> Yes, please.
> 

I think it's this series:

https://lore.kernel.org/all/20221117181127.1859634-1-dionnaglaze@google.com/

-Dov