Messages in this thread | | | Subject | Re: [PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system | From | Suravee Suthikulpanit <> | Date | Sun, 26 Apr 2020 07:28:35 +0700 |
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Ping.
Thanks, Suravee
On 4/22/20 8:30 PM, Suravee Suthikulpanit wrote: > Currently, system fails to boot because the legacy interrupt remapping > mode does not enable 128-bit IRTE (GA), which is required for x2APIC > support. > > Fix by using AMD_IOMMU_GUEST_IR_LEGACY_GA mode when booting with > kernel option amd_iommu_intr=legacy instead. The initialization > logic will check GASup and automatically fallback to using > AMD_IOMMU_GUEST_IR_LEGACY if GA mode is not supported. > > Fixes: 3928aa3f5775 ("iommu/amd: Detect and enable guest vAPIC support") > Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> > --- > drivers/iommu/amd_iommu_init.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c > index 6be3853..2b9a67e 100644 > --- a/drivers/iommu/amd_iommu_init.c > +++ b/drivers/iommu/amd_iommu_init.c > @@ -2936,7 +2936,7 @@ static int __init parse_amd_iommu_intr(char *str) > { > for (; *str; ++str) { > if (strncmp(str, "legacy", 6) == 0) { > - amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY; > + amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA; > break; > } > if (strncmp(str, "vapic", 5) == 0) { >
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