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SubjectRe: [PATCH v11 0/4] set VSESR_EL2 by user space and support NOTIFY_SEI notification
Hi gengdongjiu,

On 12/04/18 07:09, gengdongjiu wrote:
> On 2018/4/10 22:15, James Morse wrote:
>> On 09/04/18 22:36, Dongjiu Geng wrote:
>>> 1. Detect whether KVM can set set guest SError syndrome
>>> 2. Support to Set VSESR_EL2 and inject SError by user space.
>>> 3. Support live migration to keep SError pending state and VSESR_EL2 value.
>>> 4. ACPI 6.1 adds support for NOTIFY_SEI as a GHES notification mechanism, so support this
>>> notification in software, KVM or kernel ARCH code call handle_guest_sei() to let ACP driver
>>> to handle this notification.
>> Please don't post code during the merge-window, will this apply to v4.17-rc1? We
>> can't know until its tagged.

Posting code during the merge-window isn't helpful as the kernel is a moving
target, its better to wait for an 'rc' to base it on.

> I do not know when it is merge-window. About the apply version, it does not have limited.

'git fetch' Linus' tree and look at the tags. 'v4.16' lost its '-rc' suffixes,
and there isn't a 'v4.17-rc1' yet, so we are still in the merge window.

Linus sends a message to LKML. eg:

net-next closes shortly before the merge window, and re-opens afterwards. There
is a handy web page:

>> This series is doing two separate things, please split it into two series.
> OK, thanks!
>> But on the ACPI front: I don't see how any OS can support your NOTIFY_SEI when
>> firmware is ignoring the normal world's PSTATE.A.
>> The latest lobe of that discussion was on the list here:
> I have replied the mail.
> I still have some questions that need to clarify with you.
> After clarification, we will follow that.
> The question is in the reply of this mail ""

Lets keep that discussion on v9 then.

>> As it is, we would need to spot SError being delivered while SError is masked,
>> spray nasty messages about firmware being horrifically buggy, then panic(). For
>> a corrected error, this looks bad, but its preferable to letting firmware
>> silently overwrite the exception registers, causing linux to spin through the
>> vectors 'eret' with all exceptions masked.
>> I still think its best to wait for firmware that does the right thing.

> Let us discuss that in another mail.
> In a summary, I think firmware follow below rule can be OK, right?
> 1. The exception came from the EL that SError should be routed to(according to hcr_EL2.{AMO, TGE}),but PSTATE.A was set, EL3 firmware can't deliver SError;

> 2. The exception came from the EL that SError should not be routed to(according to hcr_EL2.{AMO, TGE}),even though the PSTATE.A was set,EL3 firmware still deliver SError

Problem here, more on v9.



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