diff options
| author | Roman Kisel <romank@linux.microsoft.com> | 2025-01-09 01:21:36 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-01-10 03:54:21 +0300 |
| commit | 9263abc7fd5d753dbf4cd4bf994bcf9c8c999918 (patch) | |
| tree | 73395b027b342670aea232fa7c270eb58bd6e8d6 | |
| parent | 1da602ec36a3e208c070ec23895e84cbb621a12e (diff) | |
| download | linux-9263abc7fd5d753dbf4cd4bf994bcf9c8c999918.tar.xz | |
hyperv: Enable the hypercall output page for the VTL mode
Due to the hypercall page not being allocated in the VTL mode,
the code resorts to using a part of the input page.
Allocate the hypercall output page in the VTL mode thus enabling
it to use it for output and share code with dom0.
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250108222138.1623703-4-romank@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250108222138.1623703-4-romank@linux.microsoft.com>
| -rw-r--r-- | drivers/hv/hv_common.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index c6ed3ba4bf61..af5d1dc451f6 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -278,6 +278,11 @@ static void hv_kmsg_dump_register(void) } } +static inline bool hv_output_page_exists(void) +{ + return hv_root_partition || IS_ENABLED(CONFIG_HYPERV_VTL_MODE); +} + int __init hv_common_init(void) { int i; @@ -340,7 +345,7 @@ int __init hv_common_init(void) BUG_ON(!hyperv_pcpu_input_arg); /* Allocate the per-CPU state for output arg for root */ - if (hv_root_partition) { + if (hv_output_page_exists()) { hyperv_pcpu_output_arg = alloc_percpu(void *); BUG_ON(!hyperv_pcpu_output_arg); } @@ -435,7 +440,7 @@ int hv_common_cpu_init(unsigned int cpu) void **inputarg, **outputarg; u64 msr_vp_index; gfp_t flags; - int pgcount = hv_root_partition ? 2 : 1; + const int pgcount = hv_output_page_exists() ? 2 : 1; void *mem; int ret; @@ -453,7 +458,7 @@ int hv_common_cpu_init(unsigned int cpu) if (!mem) return -ENOMEM; - if (hv_root_partition) { + if (hv_output_page_exists()) { outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg); *outputarg = (char *)mem + HV_HYP_PAGE_SIZE; } |