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arm64 fixes for -rc5

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- Fix DWARF parsing for SCS/PAC patching to work with very large modules
   (such as the amdgpu driver).
 
 - Fixes to the mpam resctrl driver.
 
 - Fix broken handling of 52-bit physical addresses when sharing memory
   from within a realm.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "There's a small crop of fixes for the MPAM resctrl driver, a fix for
  SCS/PAC patching with the AMDGPU driver and a page-table fix for
  realms running with 52-bit physical addresses:

   - Fix DWARF parsing for SCS/PAC patching to work with very large
     modules (such as the amdgpu driver)

   - Fixes to the mpam resctrl driver

   - Fix broken handling of 52-bit physical addresses when sharing
     memory from within a realm"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: realm: Fix PTE_NS_SHARED for 52bit PA support
  arm_mpam: Force __iomem casts
  arm_mpam: Disable preemption when making accesses to fake MSC in kunit test
  arm_mpam: Fix null pointer dereference when restoring bandwidth counters
  arm64/scs: Fix handling of advance_loc4
This commit is contained in:
Linus Torvalds 2026-03-20 09:23:01 -07:00
commit 165160265e
4 changed files with 27 additions and 8 deletions
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8
arch/arm64/kernel/pi/patch-scs.c
View File

@ -192,6 +192,14 @@ static int scs_handle_fde_frame(const struct eh_frame *frame,
size -= 2;
break;
case DW_CFA_advance_loc4:
loc += *opcode++ * code_alignment_factor;
loc += (*opcode++ << 8) * code_alignment_factor;
loc += (*opcode++ << 16) * code_alignment_factor;
loc += (*opcode++ << 24) * code_alignment_factor;
size -= 4;
break;
case DW_CFA_def_cfa:
case DW_CFA_offset_extended:
size = skip_xleb128(&opcode, size);

3
arch/arm64/kernel/rsi.c
View File

@ -12,6 +12,7 @@
#include <asm/io.h>
#include <asm/mem_encrypt.h>
#include <asm/pgtable.h>
#include <asm/rsi.h>
static struct realm_config config;
@ -146,7 +147,7 @@ void __init arm64_rsi_init(void)
return;
if (WARN_ON(rsi_get_realm_config(&config)))
return;
prot_ns_shared = BIT(config.ipa_bits - 1);
prot_ns_shared = __phys_to_pte_val(BIT(config.ipa_bits - 1));
if (arm64_ioremap_prot_hook_register(realm_ioremap_hook))
return;

2
drivers/resctrl/mpam_devices.c
View File

@ -1428,6 +1428,7 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
static int mpam_restore_mbwu_state(void *_ris)
{
int i;
u64 val;
struct mon_read mwbu_arg;
struct mpam_msc_ris *ris = _ris;
struct mpam_class *class = ris->vmsc->comp->class;
@ -1437,6 +1438,7 @@ static int mpam_restore_mbwu_state(void *_ris)
mwbu_arg.ris = ris;
mwbu_arg.ctx = &ris->mbwu_state[i].cfg;
mwbu_arg.type = mpam_msmon_choose_counter(class);
mwbu_arg.val = &val;
__ris_msmon_read(&mwbu_arg);
}

22
drivers/resctrl/test_mpam_devices.c
View File

@ -322,9 +322,17 @@ static void test_mpam_enable_merge_features(struct kunit *test)
mutex_unlock(&mpam_list_lock);
}
static void __test_mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
{
/* Avoid warnings when running with CONFIG_DEBUG_PREEMPT */
guard(preempt)();
mpam_reset_msc_bitmap(msc, reg, wd);
}
static void test_mpam_reset_msc_bitmap(struct kunit *test)
{
char __iomem *buf = kunit_kzalloc(test, SZ_16K, GFP_KERNEL);
char __iomem *buf = (__force char __iomem *)kunit_kzalloc(test, SZ_16K, GFP_KERNEL);
struct mpam_msc fake_msc = {};
u32 *test_result;
@ -339,33 +347,33 @@ static void test_mpam_reset_msc_bitmap(struct kunit *test)
mutex_init(&fake_msc.part_sel_lock);
mutex_lock(&fake_msc.part_sel_lock);
test_result = (u32 *)(buf + MPAMCFG_CPBM);
test_result = (__force u32 *)(buf + MPAMCFG_CPBM);
mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0);
__test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 0);
KUNIT_EXPECT_EQ(test, test_result[0], 0);
KUNIT_EXPECT_EQ(test, test_result[1], 0);
test_result[0] = 0;
test_result[1] = 0;
mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 1);
__test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 1);
KUNIT_EXPECT_EQ(test, test_result[0], 1);
KUNIT_EXPECT_EQ(test, test_result[1], 0);
test_result[0] = 0;
test_result[1] = 0;
mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 16);
__test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 16);
KUNIT_EXPECT_EQ(test, test_result[0], 0xffff);
KUNIT_EXPECT_EQ(test, test_result[1], 0);
test_result[0] = 0;
test_result[1] = 0;
mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 32);
__test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 32);
KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
KUNIT_EXPECT_EQ(test, test_result[1], 0);
test_result[0] = 0;
test_result[1] = 0;
mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 33);
__test_mpam_reset_msc_bitmap(&fake_msc, MPAMCFG_CPBM, 33);
KUNIT_EXPECT_EQ(test, test_result[0], 0xffffffff);
KUNIT_EXPECT_EQ(test, test_result[1], 1);
test_result[0] = 0;