From: Alexander Graf <graf@amazon.com>
To: Zhi Wang <zhi.wang.linux@gmail.com>
Cc: Michael Roth <michael.roth@amd.com>, <kvm@vger.kernel.org>,
<linux-coco@lists.linux.dev>, <linux-mm@kvack.org>,
<linux-crypto@vger.kernel.org>, <x86@kernel.org>,
<linux-kernel@vger.kernel.org>, <tglx@linutronix.de>,
<mingo@redhat.com>, <jroedel@suse.de>, <thomas.lendacky@amd.com>,
<hpa@zytor.com>, <ardb@kernel.org>, <pbonzini@redhat.com>,
<seanjc@google.com>, <vkuznets@redhat.com>, <jmattson@google.com>,
<luto@kernel.org>, <dave.hansen@linux.intel.com>,
<slp@redhat.com>, <pgonda@google.com>, <peterz@infradead.org>,
<srinivas.pandruvada@linux.intel.com>, <rientjes@google.com>,
<dovmurik@linux.ibm.com>, <tobin@ibm.com>, <bp@alien8.de>,
<vbabka@suse.cz>, <kirill@shutemov.name>, <ak@linux.intel.com>,
<tony.luck@intel.com>, <marcorr@google.com>,
<sathyanarayanan.kuppuswamy@linux.intel.com>,
<alpergun@google.com>, <dgilbert@redhat.com>, <jarkko@kernel.org>,
<ashish.kalra@amd.com>, <nikunj.dadhania@amd.com>,
Brijesh Singh <brijesh.singh@amd.com>
Subject: Re: [PATCH RFC v8 47/56] KVM: SVM: Support SEV-SNP AP Creation NAE event
Date: Wed, 1 Mar 2023 22:14:19 +0100 [thread overview]
Message-ID: <7eed5a32-6e68-6690-ac45-cec0868b8f5d@amazon.com> (raw)
In-Reply-To: <20230228224730.00007d21@intel.com>
On 28.02.23 21:47, Zhi Wang wrote:
> On Fri, 24 Feb 2023 13:37:48 +0100
> Alexander Graf <graf@amazon.com> wrote:
>
>> On 20.02.23 19:38, Michael Roth wrote:
>>> From: Tom Lendacky <thomas.lendacky@amd.com>
>>>
>>> Add support for the SEV-SNP AP Creation NAE event. This allows SEV-SNP
>>> guests to alter the register state of the APs on their own. This allows
>>> the guest a way of simulating INIT-SIPI.
>>>
>>> A new event, KVM_REQ_UPDATE_PROTECTED_GUEST_STATE, is created and used
>>> so as to avoid updating the VMSA pointer while the vCPU is running.
>>>
>>> For CREATE
>>> The guest supplies the GPA of the VMSA to be used for the vCPU with
>>> the specified APIC ID. The GPA is saved in the svm struct of the
>>> target vCPU, the KVM_REQ_UPDATE_PROTECTED_GUEST_STATE event is added
>>> to the vCPU and then the vCPU is kicked.
>>>
>>> For CREATE_ON_INIT:
>>> The guest supplies the GPA of the VMSA to be used for the vCPU with
>>> the specified APIC ID the next time an INIT is performed. The GPA is
>>> saved in the svm struct of the target vCPU.
>>>
>>> For DESTROY:
>>> The guest indicates it wishes to stop the vCPU. The GPA is cleared
>>> from the svm struct, the KVM_REQ_UPDATE_PROTECTED_GUEST_STATE event is
>>> added to vCPU and then the vCPU is kicked.
>>>
>>> The KVM_REQ_UPDATE_PROTECTED_GUEST_STATE event handler will be invoked
>>> as a result of the event or as a result of an INIT. The handler sets the
>>> vCPU to the KVM_MP_STATE_UNINITIALIZED state, so that any errors will
>>> leave the vCPU as not runnable. Any previous VMSA pages that were
>>> installed as part of an SEV-SNP AP Creation NAE event are un-pinned. If
>>> a new VMSA is to be installed, the VMSA guest page is pinned and set as
>>> the VMSA in the vCPU VMCB and the vCPU state is set to
>>> KVM_MP_STATE_RUNNABLE. If a new VMSA is not to be installed, the VMSA is
>>> cleared in the vCPU VMCB and the vCPU state is left as
>>> KVM_MP_STATE_UNINITIALIZED to prevent it from being run.
>>>
>>> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
>>> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
>>> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
>>> [mdr: add handling for restrictedmem]
>>> Signed-off-by: Michael Roth <michael.roth@amd.com>
>>
>> What is the intended boot sequence for SEV-SNP guests? FWIW with this
>> interface in place, guests will typically use in-guest VMSA pages to
>> hold secondary vcpu state. But that means we're now allocating 4kb of
>> memory for every vcpu that we create that will be for most of the
>> guest's lifetime superfluous.
>>
>> Wouldn't it make more sense to have a model where we only allocate the
>> VMSA for the boot CPU and leave secondary allocation to the guest? We
>> already need firmware changes for SEV-SNP - may as well make this one more.
>>
>> [...]
>>
>>> +
>>> +static int sev_snp_ap_creation(struct vcpu_svm *svm)
>>> +{
>>> + struct kvm_sev_info *sev = &to_kvm_svm(svm->vcpu.kvm)->sev_info;
>>> + struct kvm_vcpu *vcpu = &svm->vcpu;
>>> + struct kvm_vcpu *target_vcpu;
>>> + struct vcpu_svm *target_svm;
>>> + unsigned int request;
>>> + unsigned int apic_id;
>>> + bool kick;
>>> + int ret;
>>> +
>>> + request = lower_32_bits(svm->vmcb->control.exit_info_1);
>>> + apic_id = upper_32_bits(svm->vmcb->control.exit_info_1);
>>> +
>>> + /* Validate the APIC ID */
>>> + target_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, apic_id);
>>
>> Out of curiosity: The target CPU can be my own vCPU, right?
>>
>>
>>> + if (!target_vcpu) {
>>> + vcpu_unimpl(vcpu, "vmgexit: invalid AP APIC ID [%#x] from guest\n",
>>> + apic_id);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + ret = 0;
>>> +
>>> + target_svm = to_svm(target_vcpu);
>>> +
>>> + /*
>>> + * The target vCPU is valid, so the vCPU will be kicked unless the
>>> + * request is for CREATE_ON_INIT. For any errors at this stage, the
>>> + * kick will place the vCPU in an non-runnable state.
>>> + */
>>> + kick = true;
>>> +
>>> + mutex_lock(&target_svm->sev_es.snp_vmsa_mutex);
>>> +
>>> + target_svm->sev_es.snp_vmsa_gpa = INVALID_PAGE;
>>> + target_svm->sev_es.snp_ap_create = true;
>>> +
>>> + /* Interrupt injection mode shouldn't change for AP creation */
>>> + if (request < SVM_VMGEXIT_AP_DESTROY) {
>>> + u64 sev_features;
>>> +
>>> + sev_features = vcpu->arch.regs[VCPU_REGS_RAX];
>>> + sev_features ^= sev->sev_features;
>>> + if (sev_features & SVM_SEV_FEAT_INT_INJ_MODES) {
>>> + vcpu_unimpl(vcpu, "vmgexit: invalid AP injection mode [%#lx] from guest\n",
>>> + vcpu->arch.regs[VCPU_REGS_RAX]);
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> + }
>>> +
>>> + switch (request) {
>>> + case SVM_VMGEXIT_AP_CREATE_ON_INIT:
>>> + kick = false;
>>> + fallthrough;
>>> + case SVM_VMGEXIT_AP_CREATE:
>>> + if (!page_address_valid(vcpu, svm->vmcb->control.exit_info_2)) {
>>> + vcpu_unimpl(vcpu, "vmgexit: invalid AP VMSA address [%#llx] from guest\n",
>>> + svm->vmcb->control.exit_info_2);
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> + /*
>>> + * Malicious guest can RMPADJUST a large page into VMSA which
>>> + * will hit the SNP erratum where the CPU will incorrectly signal
>>> + * an RMP violation #PF if a hugepage collides with the RMP entry
>>> + * of VMSA page, reject the AP CREATE request if VMSA address from
>>> + * guest is 2M aligned.
>>
>> This will break genuine current Linux kernels that just happen to
>> allocate a guest page, no? In fact, given enough vCPUs you're almost
>> guaranteed to hit an aligned structure somewhere. What is the guest
>> supposed to do in that situation?
>>
>>
>>> + */
>>> + if (IS_ALIGNED(svm->vmcb->control.exit_info_2, PMD_SIZE)) {
>>> + vcpu_unimpl(vcpu,
>>> + "vmgexit: AP VMSA address [%llx] from guest is unsafe as it is 2M aligned\n",
>>> + svm->vmcb->control.exit_info_2);
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> + target_svm->sev_es.snp_vmsa_gpa = svm->vmcb->control.exit_info_2;
>>> + break;
>>> + case SVM_VMGEXIT_AP_DESTROY:
>>
>> I don't understand the destroy path. Why does this case destroy anything?
>>
>>
>>> + break;
>>> + default:
>>> + vcpu_unimpl(vcpu, "vmgexit: invalid AP creation request [%#x] from guest\n",
>>> + request);
>>> + ret = -EINVAL;
>>> + break;
>>> + }
>>> +
>>> +out:
>>> + if (kick) {
>>> + if (target_vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)
>>> + target_vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
>>
>> What if the guest AP goes through a create -> destroy -> create cycle?
>> Will it stay runnable while destroyed?
> The code is not very straightforward.
>
> 1) target_svm->sev_es.snp_vmsa_gpa is set as INVALID_PAGE in the beginning of this function.
>
> 2) If a DESTROY is hit in this function, target_svm->sev_es.snp_vmsa_gpa will be
> left as INVALID_PAGE.
>
> 3) At the end of this function, it calls kvm_make_request(KVM_REQ_UPDATE_PROTECTED_GUEST_STATE).
>
> 4) In the vcpu_enter_guest(), the kvm_vcpu_reset()->sev_snp_init_protected_guest_state()
> ->__sev_snp_init_protected_guest_state() is called.
>
> 5) The mp_state is set to KVM_MP_STATE_STOPPED by default and the runtime VMSA is
> cleared. Then the it will be initialized according to the guest's
> configuration.
>
> 6) As the snp_vmsa_gpa is set as INVALID_PAGE in 1, the mp_state will be left as
> KVM_MP_STATE_STOPPED.
>
> 7) With this code piece:
>
> + kvm_vcpu_reset(vcpu, true);
> + if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
> + goto out;
>
> vcpu_enter_guest() bails out.
Thanks a lot Zhi for the detailed explanation! I think this code flow
wants to become slightly more obvious. For example, if we just said
case SVM_VMGEXIT_AP_DESTROY:
/* This will tell __sev_snp_update_protected_guest_state to unmap
the VMSA */
target_svm->sev_es.snp_vmsa_gpa = INVALID_PAGE;
break;
We'd get a big win in readability with little effort. It makes it
immediately obvious where to look for the destroy operation.
Alex
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
next prev parent reply other threads:[~2023-03-01 21:14 UTC|newest]
Thread overview: 147+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-20 18:37 [PATCH RFC v8 00/56] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 01/56] KVM: x86: Add 'fault_is_private' x86 op Michael Roth
2023-03-01 10:25 ` Zhi Wang
2023-03-18 4:51 ` Isaku Yamahata
2023-03-20 17:46 ` Michael Roth
2023-03-18 4:53 ` Isaku Yamahata
2023-02-20 18:37 ` [PATCH RFC v8 02/56] KVM: x86: Add 'update_mem_attr' " Michael Roth
2023-03-18 4:56 ` Isaku Yamahata
2023-03-20 18:05 ` Michael Roth
2023-03-21 11:21 ` Zhi Wang
2023-03-22 1:58 ` Michael Roth
2023-03-23 18:17 ` Zhi Wang
2023-03-28 4:36 ` Michael Roth
2023-03-28 23:00 ` Zhi Wang
2023-03-29 23:50 ` Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 03/56] KVM: x86: Add platform hooks for private memory invalidations Michael Roth
2023-03-18 5:13 ` Isaku Yamahata
2023-03-20 18:09 ` Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 04/56] KVM: Add HVA range operator Michael Roth
2023-02-20 21:37 ` Zhi Wang
2023-03-27 0:34 ` Michael Roth
2023-04-04 14:40 ` Zhi Wang
2023-02-20 18:37 ` [PATCH RFC v8 05/56] KVM: SEV: Require KVM_PROTECTED_VM when AMD_MEM_ENCRYPT is enabled Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 06/56] KVM: Split out memory attribute xarray updates to helper function Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 07/56] KVM: SEV: Populate private memory fd during LAUNCH_UPDATE_DATA Michael Roth
2023-02-20 18:37 ` [PATCH RFC v8 08/56] KVM: SEV: Rename sev_{pin,unpin}_memory Michael Roth
2023-03-03 14:00 ` Vlastimil Babka
2023-03-06 11:01 ` Nikunj A. Dadhania
2023-02-20 18:38 ` [PATCH RFC v8 09/56] KVM: SEV: Handle memory backed by restricted memfd Michael Roth
2023-03-03 14:05 ` Vlastimil Babka
2023-03-06 11:03 ` Nikunj A. Dadhania
2023-02-20 18:38 ` [PATCH RFC v8 10/56] x86/cpufeatures: Add SEV-SNP CPU feature Michael Roth
2023-02-21 21:21 ` Sathyanarayanan Kuppuswamy
2023-02-22 23:27 ` Kalra, Ashish
2023-02-20 18:38 ` [PATCH RFC v8 11/56] x86/sev: Add the host SEV-SNP initialization support Michael Roth
2023-02-20 20:12 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 12/56] x86/sev: Add RMP entry lookup helpers Michael Roth
2023-03-03 15:28 ` Vlastimil Babka
2023-03-29 22:59 ` Michael Roth
2023-04-20 16:31 ` Vlastimil Babka
2023-02-20 18:38 ` [PATCH RFC v8 13/56] x86/fault: Add helper for dumping RMP entries Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 14/56] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 15/56] x86/sev: Invalidate pages from the direct map when adding them to the RMP table Michael Roth
2023-03-01 12:07 ` Tom Dohrmann
2023-03-01 16:15 ` Dave Hansen
2023-03-28 22:12 ` Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 16/56] x86/traps: Define RMP violation #PF error code Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 17/56] x86/fault: Add support to handle the RMP fault for user address Michael Roth
2023-03-01 16:21 ` Dave Hansen
2023-03-28 23:31 ` Michael Roth
2023-04-11 18:27 ` Dave Hansen
2023-03-03 15:31 ` Vlastimil Babka
2023-02-20 18:38 ` [PATCH RFC v8 18/56] x86/fault: fix handle_split_page_fault() to work with memfd backed pages Michael Roth
2023-02-20 19:57 ` Hugh Dickins
2023-02-20 20:31 ` Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 19/56] x86/fault: Return pfn from dump_pagetable() for SEV-specific fault handling Michael Roth
2023-02-20 21:13 ` Zhi Wang
2023-02-28 10:53 ` Wu Zongyong
2023-02-20 18:38 ` [PATCH RFC v8 20/56] crypto:ccp: Define the SEV-SNP commands Michael Roth
2023-04-17 14:54 ` Sabin Rapan
2023-02-20 18:38 ` [PATCH RFC v8 21/56] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 22/56] crypto:ccp: Provide API to issue SEV and SNP commands Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 23/56] crypto: ccp: Introduce snp leaked pages list Michael Roth
2023-03-03 15:54 ` Vlastimil Babka
2023-02-20 18:38 ` [PATCH RFC v8 24/56] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Michael Roth
2023-02-21 9:28 ` Zhi Wang
2023-02-21 15:31 ` Kalra, Ashish
2023-02-21 21:15 ` Zhi Wang
2023-02-21 22:06 ` Kalra, Ashish
2023-02-20 18:38 ` [PATCH RFC v8 25/56] crypto: ccp: Handle the legacy SEV command " Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 26/56] crypto: ccp: Add the SNP_PLATFORM_STATUS command Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 27/56] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command Michael Roth
2023-02-22 12:32 ` Zhi Wang
2023-02-22 16:50 ` Tom Lendacky
2023-02-22 22:43 ` Kalra, Ashish
2023-02-23 6:38 ` Zhi Wang
2023-02-23 14:19 ` Tom Lendacky
2023-02-20 18:38 ` [PATCH RFC v8 28/56] crypto: ccp: Provide APIs to query extended attestation report Michael Roth
2023-02-22 20:24 ` Zhi Wang
2023-02-22 22:35 ` Kalra, Ashish
2023-02-23 8:14 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 29/56] KVM: SVM: Add support to handle AP reset MSR protocol Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 30/56] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 31/56] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe Michael Roth
2023-02-22 20:42 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 32/56] KVM: SVM: Add initial SEV-SNP support Michael Roth
2023-02-23 17:46 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 33/56] KVM: SVM: Add KVM_SNP_INIT command Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 34/56] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Michael Roth
2023-02-23 21:41 ` Zhi Wang
2023-02-24 16:22 ` Tom Lendacky
2023-04-26 17:06 ` Sabin Rapan
2023-04-26 18:02 ` Tom Lendacky
2023-02-20 18:38 ` [PATCH RFC v8 35/56] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Michael Roth
2023-02-24 11:55 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 36/56] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Michael Roth
2023-03-24 14:40 ` Alexander Graf
2023-02-20 18:38 ` [PATCH RFC v8 37/56] KVM: X86: Keep the NPT and RMP page level in sync Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 38/56] KVM: x86: Define RMP page fault error bits for #NPF Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 39/56] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 40/56] KVM: SVM: Add KVM_EXIT_VMGEXIT Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 41/56] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Michael Roth
2023-02-24 15:06 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 42/56] KVM: SVM: Add support to handle " Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 43/56] KVM: x86: Export the kvm_zap_gfn_range() for the SNP use Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 44/56] KVM: SVM: Add support to handle the RMP nested page fault Michael Roth
2023-02-28 19:11 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 45/56] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Michael Roth
2023-02-24 11:01 ` Alexander Graf
2023-02-28 19:34 ` Zhi Wang
2023-04-17 13:05 ` Alexander Graf
2023-02-20 18:38 ` [PATCH RFC v8 46/56] KVM: SVM: Use a VMSA physical address variable for populating VMCB Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 47/56] KVM: SVM: Support SEV-SNP AP Creation NAE event Michael Roth
2023-02-24 12:37 ` Alexander Graf
2023-02-28 20:47 ` Zhi Wang
2023-03-01 21:14 ` Alexander Graf [this message]
2023-04-05 0:54 ` Michael Roth
2023-04-04 22:48 ` Michael Roth
2023-04-05 15:20 ` Tom Lendacky
2023-02-20 18:38 ` [PATCH RFC v8 48/56] KVM: SVM: Add SNP-specific handling for memory attribute updates Michael Roth
2023-03-01 23:37 ` Dave Hansen
2023-04-05 23:48 ` Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 49/56] KVM: SVM: Implement .fault_is_private callback for SNP Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 50/56] KVM: SEV: Handle restricted memory invalidations " Michael Roth
2023-03-01 10:41 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 51/56] KVM: SVM: Add module parameter to enable the SEV-SNP Michael Roth
2023-03-01 10:45 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 52/56] ccp: Add support to decrypt the page Michael Roth
2023-03-01 21:20 ` Zhi Wang
2023-03-02 5:59 ` Dov Murik
2023-03-02 14:33 ` Tom Lendacky
2023-03-02 21:11 ` Dov Murik
2023-02-20 18:38 ` [PATCH RFC v8 53/56] KVM: SVM: Make VMSAVE target area memory allocation SNP safe Michael Roth
2023-03-01 21:23 ` Zhi Wang
2023-02-20 18:38 ` [PATCH RFC v8 54/56] x86/sev: Add KVM commands for instance certs Michael Roth
2023-02-21 12:40 ` Dov Murik
2023-03-02 0:02 ` Zhi Wang
2023-03-02 1:41 ` Dionna Amalie Glaze
2023-03-02 11:27 ` Zhi Wang
2023-03-02 11:34 ` Dov Murik
2023-02-20 18:38 ` [PATCH RFC v8 55/56] x86/sev: Document KVM_SEV_SNP_{G,S}ET_CERTS Michael Roth
2023-02-20 18:38 ` [PATCH RFC v8 56/56] iommu/amd: Add IOMMU_SNP_SHUTDOWN support Michael Roth
2023-03-01 16:56 ` [PATCH RFC v8 00/56] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Dave Hansen
2023-03-01 22:59 ` Zhi Wang
2023-03-01 23:39 ` Dave Hansen
2023-08-03 18:27 ` Schander, Johanna 'Mimoja' Amelie
2023-08-04 1:01 ` Kalra, Ashish
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