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Re: [PATCH v2 12/13] s390x: protvirt: Disable address checks for PV gues
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From: |
David Hildenbrand |
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Subject: |
Re: [PATCH v2 12/13] s390x: protvirt: Disable address checks for PV guest IO emulation |
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Date: |
Fri, 29 Nov 2019 12:42:31 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 29.11.19 10:48, Janosch Frank wrote:
> IO instruction data is routed through SIDAD for protected guests, so
> adresses do not need to be checked, as this is kernel memory.
"do not need" - is it actually evil to check? I would have assumed the
kernel checks and these checks are just superfluous but not dangerous?
IOW, some overhead we can ignore for now easily.
Same comment regarding doing the SIDAD access differently ...
--
Thanks,
David / dhildenb
- [PATCH v2 04/13] s390x: protvirt: Handle diag 308 subcodes 0,1,3,4, (continued)
- [PATCH v2 12/13] s390x: protvirt: Disable address checks for PV guest IO emulation, Janosch Frank, 2019/11/29
- Re: [PATCH v2 12/13] s390x: protvirt: Disable address checks for PV guest IO emulation,
David Hildenbrand <=
- [PATCH v2 09/13] s390x: Exit on vcpu reset error, Janosch Frank, 2019/11/29
- [PATCH v2 11/13] s390x: protvirt: Move diag 308 data over SIDAD, Janosch Frank, 2019/11/29
- [PATCH v2 10/13] s390x: protvirt: Set guest IPL PSW, Janosch Frank, 2019/11/29
- [PATCH v2 03/13] s390x: protvirt: Support unpack facility, Janosch Frank, 2019/11/29
- [PATCH v2 13/13] s390x: protvirt: Handle SIGP store status correctly, Janosch Frank, 2019/11/29