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hyperv: Enable the hypercall output page for the VTL mode

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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>
This commit is contained in:
Roman Kisel
2025-01-08 14:21:36 -08:00
committed by Wei Liu
parent 1da602ec36
commit 9263abc7fd
1 changed files with 8 additions and 3 deletions
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11
drivers/hv/hv_common.c
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@@ -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;
}