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Message-ID: <20250903063018.3346652-3-rppt@kernel.org>
Date: Wed, 3 Sep 2025 09:30:18 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexander Graf <graf@...zon.com>,
Baoquan He <bhe@...hat.com>,
Changyuan Lyu <changyuanl@...gle.com>,
Chris Li <chrisl@...nel.org>,
Jason Gunthorpe <jgg@...dia.com>,
Mike Rapoport <rppt@...nel.org>,
Pasha Tatashin <pasha.tatashin@...een.com>,
Pratyush Yadav <pratyush@...nel.org>,
kexec@...ts.infradead.org,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] lib/test_kho: use kho_preserve_vmalloc instead of storing addresses in fdt
From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
KHO test stores physical addresses of the preserved folios directly in
fdt.
Use kho_preserve_vmalloc() instead of it and kho_restore_vmalloc() to
retrieve the addresses after kexec.
This makes the test more scalable from one side and adds tests coverage
for kho_preserve_vmalloc() from the other.
Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
---
lib/test_kho.c | 30 +++++++++++++++++++++++-------
1 file changed, 23 insertions(+), 7 deletions(-)
diff --git a/lib/test_kho.c b/lib/test_kho.c
index c2eb899c3b45..10045f5979a0 100644
--- a/lib/test_kho.c
+++ b/lib/test_kho.c
@@ -32,6 +32,7 @@ module_param(max_mem, long, 0644);
struct kho_test_state {
unsigned int nr_folios;
struct folio **folios;
+ phys_addr_t *folios_info;
struct folio *fdt;
__wsum csum;
};
@@ -68,13 +69,17 @@ static struct notifier_block kho_test_nb = {
static int kho_test_save_data(struct kho_test_state *state, void *fdt)
{
phys_addr_t *folios_info __free(kvfree) = NULL;
+ phys_addr_t folios_info_phys;
int err = 0;
- folios_info = kvmalloc_array(state->nr_folios, sizeof(*folios_info),
- GFP_KERNEL);
+ folios_info = vmalloc_array(state->nr_folios, sizeof(*folios_info));
if (!folios_info)
return -ENOMEM;
+ err = kho_preserve_vmalloc(folios_info, &folios_info_phys);
+ if (err)
+ return err;
+
for (int i = 0; i < state->nr_folios; i++) {
struct folio *folio = state->folios[i];
unsigned int order = folio_order(folio);
@@ -89,11 +94,14 @@ static int kho_test_save_data(struct kho_test_state *state, void *fdt)
err |= fdt_begin_node(fdt, "data");
err |= fdt_property(fdt, "nr_folios", &state->nr_folios,
sizeof(state->nr_folios));
- err |= fdt_property(fdt, "folios_info", folios_info,
- state->nr_folios * sizeof(*folios_info));
+ err |= fdt_property(fdt, "folios_info", &folios_info_phys,
+ sizeof(folios_info_phys));
err |= fdt_property(fdt, "csum", &state->csum, sizeof(state->csum));
err |= fdt_end_node(fdt);
+ if (!err)
+ state->folios_info = no_free_ptr(folios_info);
+
return err;
}
@@ -197,7 +205,8 @@ static int kho_test_save(void)
static int kho_test_restore_data(const void *fdt, int node)
{
const unsigned int *nr_folios;
- const phys_addr_t *folios_info;
+ const phys_addr_t *folios_info_phys;
+ phys_addr_t *folios_info;
const __wsum *old_csum;
__wsum csum = 0;
int len;
@@ -212,8 +221,12 @@ static int kho_test_restore_data(const void *fdt, int node)
if (!old_csum || len != sizeof(*old_csum))
return -EINVAL;
- folios_info = fdt_getprop(fdt, node, "folios_info", &len);
- if (!folios_info || len != sizeof(*folios_info) * *nr_folios)
+ folios_info_phys = fdt_getprop(fdt, node, "folios_info", &len);
+ if (!folios_info_phys || len != sizeof(*folios_info_phys))
+ return -EINVAL;
+
+ folios_info = kho_restore_vmalloc(*folios_info_phys);
+ if (!folios_info)
return -EINVAL;
for (int i = 0; i < *nr_folios; i++) {
@@ -233,6 +246,8 @@ static int kho_test_restore_data(const void *fdt, int node)
folio_put(folio);
}
+ vfree(folios_info);
+
if (csum != *old_csum)
return -EINVAL;
@@ -291,6 +306,7 @@ static void kho_test_cleanup(void)
folio_put(kho_test_state.folios[i]);
kvfree(kho_test_state.folios);
+ vfree(kho_test_state.folios_info);
}
static void __exit kho_test_exit(void)
--
2.50.1
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