RFR: 8378107: Data cache zeroing is used even when it is prohibited

[Andrew Dinn]

On Tue, 17 Feb 2026 16:24:48 GMT, Andrew Haley <aph at openjdk.org> wrote:

> The DC ZVA instruction should not be used when DZP, bit [4] in DCZID_EL0, is set.
> 
> It turns out that detection of DZP, bit [4] in DCZID_EL0, never worked. And this was never a problem until now, because everyone supports DC ZVA instructions.

Yeah looks good.

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Marked as reviewed by adinn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29762#pullrequestreview-3853602236