hv_output_page_exists() controls whether the per-CPU Hyper-V output argument page is allocated at boot. This page is required for hypercalls that return results via an output GPA, like HvCallGetVpRegisters.
The VSM drivers read VSM-specific VP registers (e.g. HvRegisterVsmVpStatus, HvRegisterVsmCapabilities) via get_vp_registers(), which issues HvCallGetVpRegisters and therefore depends on the output argument page being present. Without it, those hypercalls fail and VSM initialization cannot proceed. Extend hv_output_page_exists() to return true when CONFIG_HYPERV_VSM is enabled. Signed-off-by: Thara Gopinath <[email protected]> --- drivers/hv/hv_common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 31256cb22b39e..44f4a10984618 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -259,7 +259,8 @@ static void hv_kmsg_dump_register(void) static inline bool hv_output_page_exists(void) { - return hv_parent_partition() || IS_ENABLED(CONFIG_HYPERV_VTL_MODE); + return hv_parent_partition() || IS_ENABLED(CONFIG_HYPERV_VTL_MODE) || + IS_ENABLED(CONFIG_HYPERV_VSM); } void __init hv_get_partition_id(void) -- 2.34.1
