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KVM: arm64: pkvm: Implement CONFIG_DEBUG_LIST at EL2

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Currently the check functions are stubbed out at EL2. Implement
versions suitable for the constrained EL2 environment.

Signed-off-by: Keir Fraser <keirf@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220131124114.3103337-1-keirf@google.com
This commit is contained in:
Keir Fraser 2022-01-31 12:40:53 +00:00 committed by Marc Zyngier
parent dfefa04a90
commit 4c68d6c0a1
3 changed files with 56 additions and 23 deletions
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3
arch/arm64/kvm/hyp/nvhe/Makefile
View file

@ -13,10 +13,11 @@ lib-objs := clear_page.o copy_page.o memcpy.o memset.o
lib-objs := $(addprefix ../../../lib/, $(lib-objs))
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
hyp-main.o hyp-smp.o psci-relay.o early_alloc.o stub.o page_alloc.o \
hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \
cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o
obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o
obj-$(CONFIG_DEBUG_LIST) += list_debug.o
obj-y += $(lib-objs)
##

54
arch/arm64/kvm/hyp/nvhe/list_debug.c Normal file
View file

@ -0,0 +1,54 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022 - Google LLC
* Author: Keir Fraser <keirf@google.com>
*/
#include <linux/list.h>
#include <linux/bug.h>
static inline __must_check bool nvhe_check_data_corruption(bool v)
{
return v;
}
#define NVHE_CHECK_DATA_CORRUPTION(condition) \
nvhe_check_data_corruption(({ \
bool corruption = unlikely(condition); \
if (corruption) { \
if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
BUG_ON(1); \
} else \
WARN_ON(1); \
} \
corruption; \
}))
/* The predicates checked here are taken from lib/list_debug.c. */
bool __list_add_valid(struct list_head *new, struct list_head *prev,
struct list_head *next)
{
if (NVHE_CHECK_DATA_CORRUPTION(next->prev != prev) ||
NVHE_CHECK_DATA_CORRUPTION(prev->next != next) ||
NVHE_CHECK_DATA_CORRUPTION(new == prev || new == next))
return false;
return true;
}
bool __list_del_entry_valid(struct list_head *entry)
{
struct list_head *prev, *next;
prev = entry->prev;
next = entry->next;
if (NVHE_CHECK_DATA_CORRUPTION(next == LIST_POISON1) ||
NVHE_CHECK_DATA_CORRUPTION(prev == LIST_POISON2) ||
NVHE_CHECK_DATA_CORRUPTION(prev->next != entry) ||
NVHE_CHECK_DATA_CORRUPTION(next->prev != entry))
return false;
return true;
}

22
arch/arm64/kvm/hyp/nvhe/stub.c
View file

@ -1,22 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Stubs for out-of-line function calls caused by re-using kernel
* infrastructure at EL2.
*
* Copyright (C) 2020 - Google LLC
*/
#include <linux/list.h>
#ifdef CONFIG_DEBUG_LIST
bool __list_add_valid(struct list_head *new, struct list_head *prev,
struct list_head *next)
{
return true;
}
bool __list_del_entry_valid(struct list_head *entry)
{
return true;
}
#endif