From 0875f3cd74b2f305e82bff4e640c89f891ca84f8 Mon Sep 17 00:00:00 2001 From: Ed Maste Date: Tue, 20 Aug 2024 11:43:11 -0400 Subject: [PATCH] Revert "x86: Enable Intel DMAR by default" A number of people have reported panics with it enabled by default, possibly due to broken ACPI tables, which we do not handle well. D46382 is a potential fix for this issue. Additionally DMAR is currently not compatible with bhyve passthrough (see comment #10 in PR280817), with a draft patch to address that in D25672. Revert to disabling DMAR by default pending the resolution of those two issues. This reverts commit 3192fc30230ae432b80cca783abc2dbea9d3f383. PR: 280817 Sponsored by: The FreeBSD Foundation --- sys/x86/iommu/intel_drv.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/sys/x86/iommu/intel_drv.c b/sys/x86/iommu/intel_drv.c index 9401892aa9d6..0b25620114cd 100644 --- a/sys/x86/iommu/intel_drv.c +++ b/sys/x86/iommu/intel_drv.c @@ -159,8 +159,7 @@ dmar_count_iter(ACPI_DMAR_HEADER *dmarh, void *arg) int dmar_rmrr_enable = 1; -static int dmar_enable = 1; - +static int dmar_enable = 0; static void dmar_identify(driver_t *driver, device_t parent) {