From: Wei Liu <[email protected]> Microsoft Hypervisor delivers three vectors to the NT HAL running in the root partition and refuses to map a device interrupt to any of them when interrupt remapping is not available in the system. As of writing, the nested MSHV setup has no interrupt remapping capability.
The three vectors are: HAL_NT_APC_VECTOR 0x1F HAL_NT_DPC_VECTOR 0x2F HAL_NT_CLOCK_IPI_VECTOR 0xD2 0x1F is below FIRST_EXTERNAL_VECTOR so the vector allocator never hands it out, but 0x2F and 0xD2 are both inside the allocatable range and are handed out once enough vectors are in use. Mapping such an interrupt then fails with HV_STATUS_INVALID_PARAMETER, and the interrupt is never delivered. Reserve all three next to the hypervisor debug vectors that are already kept out of the allocator's hands. Signed-off-by: Wei Liu <[email protected]> --- arch/x86/kernel/cpu/mshyperv.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 185d4f677ec0..229c7377a980 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -502,17 +502,32 @@ static void hv_reserve_irq_vectors(void) #define HYPERV_DBG_ASSERT_VECTOR 0x2C #define HYPERV_DBG_SERVICE_VECTOR 0x2D + /* + * The hypervisor delivers these three to the NT HAL and refuses to + * map a device interrupt to any of them. + * + * The hypervisor will provide a hint in the future when these + * vectors become available to use. + */ + #define HAL_NT_APC_VECTOR 0x1F + #define HAL_NT_DPC_VECTOR 0x2F + #define HAL_NT_CLOCK_IPI_VECTOR 0xD2 + if (cpu_feature_enabled(X86_FEATURE_FRED)) return; if (test_and_set_bit(HYPERV_DBG_ASSERT_VECTOR, system_vectors) || test_and_set_bit(HYPERV_DBG_SERVICE_VECTOR, system_vectors) || - test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors)) + test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors) || + test_and_set_bit(HAL_NT_APC_VECTOR, system_vectors) || + test_and_set_bit(HAL_NT_DPC_VECTOR, system_vectors) || + test_and_set_bit(HAL_NT_CLOCK_IPI_VECTOR, system_vectors)) BUG(); - pr_info("Hyper-V: reserve vectors: 0x%x 0x%x 0x%x\n", + pr_info("Hyper-V: reserve vectors: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", HYPERV_DBG_ASSERT_VECTOR, HYPERV_DBG_SERVICE_VECTOR, - HYPERV_DBG_FASTFAIL_VECTOR); + HYPERV_DBG_FASTFAIL_VECTOR, HAL_NT_APC_VECTOR, + HAL_NT_DPC_VECTOR, HAL_NT_CLOCK_IPI_VECTOR); } static void __init ms_hyperv_init_platform(void) -- 2.53.0
