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Instead check whether any IOMMU on the system doesn't support Invalidate All in order to perform the per-domain and per-device flushes. Fixes: 9c46139de889 ('amd iommu: Support INVALIDATE_IOMMU_ALL command.') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- I don't have a way to test host suspend/resume, so the patch is only build tested. --- xen/drivers/passthrough/amd/iommu_init.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/drivers/passthrough/amd/iommu_init.c b/xen/drivers/passthr= ough/amd/iommu_init.c index 9773ccfcb41f..4facff93d68b 100644 --- a/xen/drivers/passthrough/amd/iommu_init.c +++ b/xen/drivers/passthrough/amd/iommu_init.c @@ -1580,6 +1580,7 @@ void cf_check amd_iommu_crash_shutdown(void) void cf_check amd_iommu_resume(void) { struct amd_iommu *iommu; + bool invalidate_all =3D true; =20 for_each_amd_iommu ( iommu ) { @@ -1589,10 +1590,12 @@ void cf_check amd_iommu_resume(void) */ disable_iommu(iommu); enable_iommu(iommu); + if ( !iommu->features.flds.ia_sup && invalidate_all ) + invalidate_all =3D false; } =20 /* flush all cache entries after iommu re-enabled */ - if ( !iommu->features.flds.ia_sup ) + if ( !invalidate_all ) { invalidate_all_devices(); invalidate_all_domain_pages(); --=20 2.40.0