[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] iommu: fix quarantine mode command line documentation
commit 94a5127ebeb4a005f128150909ca78bfea50206a Author: Roger Pau Monne <roger.pau@xxxxxxxxxx> AuthorDate: Thu Oct 19 12:45:51 2023 +0200 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Thu Oct 19 21:52:52 2023 +0100 iommu: fix quarantine mode command line documentation With the addition of per-device quarantine page tables the sink page is now exclusive for each device, and thus writable. Update the documentation to reflect the current implementation. Fixes: 14dd241aad8a ('IOMMU/x86: use per-device page tables for quarantining') Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> Release-acked-by: Henry Wang <Henry.Wang@xxxxxxx> --- docs/misc/xen-command-line.pandoc | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line.pandoc index 604650aaee..9121d8a294 100644 --- a/docs/misc/xen-command-line.pandoc +++ b/docs/misc/xen-command-line.pandoc @@ -1520,15 +1520,14 @@ boolean (e.g. `iommu=no`) can override this and leave the IOMMUs disabled. should be enabled. Quarantining can be done in two ways: In its basic form, all in-flight DMA will simply be forced to encounter IOMMU faults. Since there are systems where doing so can cause host lockup, - an alternative form is available where writes to memory will be made - fault, but reads will be directed to a scratch page. The implication - here is that such reads will go unnoticed, i.e. an admin may not - become aware of the underlying problem. + an alternative form is available where accesses to memory will be directed + to a scratch page. The implication here is that such accesses will go + unnoticed, i.e. an admin may not become aware of the underlying problem. Therefore, if this option is set to true (the default), Xen always quarantines such devices; they must be explicitly assigned back to Dom0 before they can be used there again. If set to "scratch-page", still - active DMA reads will additionally be directed to a "scratch" page. If + active DMA operations will additionally be directed to a "scratch" page. If set to false, Xen will only quarantine devices the toolstack has arranged for getting quarantined, and only in the "basic" form. -- generated by git-patchbot for /home/xen/git/xen.git#master
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