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Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to
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From: |
Christian Borntraeger |
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Subject: |
Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode |
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Date: |
Wed, 26 Feb 2020 16:06:42 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 |
On 26.02.20 15:59, David Hildenbrand wrote:
> On 26.02.20 13:20, Janosch Frank wrote:
>> Ballooning in protected VMs can only be done when the guest shares the
>> pages it gives to the host. Hence, until we have a solution for this
>> in the guest kernel, we inhibit ballooning when switching into
>> protected mode and reverse that once we move out of it.
>
> I don't understand what you mean here, sorry. zapping a page will mean
> that a fresh one will be faulted in when accessed. And AFAIK, that means
> it will be encrypted again when needed.
>
> Is that more like the UV will detect this as an integrity issue and
> crash the VM?
yes, the UV will detect a fresh page as an integrity issue.
Only if the page was defined to be shared by the guest, we would avoid the
integrity check.
- Re: [PATCH v6] s390x: Rename and use constants for short PSW address and mask, (continued)
- [PATCH v5 05/18] s390x: protvirt: Add migration blocker, Janosch Frank, 2020/02/26
- [PATCH v5 06/18] s390x: protvirt: Handle diag 308 subcodes 0,1,3,4, Janosch Frank, 2020/02/26
- [PATCH v5 04/18] s390x: protvirt: Support unpack facility, Janosch Frank, 2020/02/26
- [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode, Janosch Frank, 2020/02/26
- Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode, Janosch Frank, 2020/02/26
- Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode, Christian Borntraeger, 2020/02/26
- Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode, David Hildenbrand, 2020/02/26
- Re: [PATCH v5 07/18] s390x: protvirt: Inhibit balloon when switching to protected mode, Halil Pasic, 2020/02/27
[PATCH v5 09/18] s390x: Add SIDA memory ops, Janosch Frank, 2020/02/26
[PATCH v5 13/18] s390x: protvirt: Move diag 308 data over SIDAD, Janosch Frank, 2020/02/26