Re: [PATCH v2 0/8] KVM: arm64: FPSIMD/SVE/SME fixes
From: Mark Brown <broonie@kernel.org>
Date: 2025-02-08 00:27:37
Also in:
stable
On Thu, Feb 06, 2025 at 02:10:54PM +0000, Mark Rutland wrote:
These patches fix some issues with the way KVM manages FPSIMD/SVE/SME state. The series supersedes my earlier attempt at fixing the host SVE state corruption issue:
...
Patch 8 addresses some mismanagement of ZCR_EL{1,2} which can result in
the host VMM unexpectedly receiving a SIGKILL. To fix this, we eagerly
switch ZCR_EL{1,2} at guest<->host transitions, as discussed on another
series:https://lore.kernel.org/linux-arm-kernel/Z4pAMaEYvdLpmbg2@J2N7QTR9R3/ (local) https://lore.kernel.org/linux-arm-kernel/86o6zzukwr.wl-maz@kernel.org/ (local) https://lore.kernel.org/linux-arm-kernel/Z5Dc-WMu2azhTuMn@J2N7QTR9R3/ (local)
The end result is that KVM loses ~100 lines of code, and becomes a bit simpler to reason about.
Quite a bit, and much more clearly too which makes the whole thing more managable and discoverable. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> although I'm not sure I was actually testing anything you weren't.
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