From b613f59dd2628937860f37dbfbe315d9edcb1668 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Thu, 21 Jan 2016 15:34:35 +0000 Subject: [PATCH] ARM: KVM: Enforce sorting of all CP tables Since we're obviously terrible at sorting the CP tables, make sure we're going to do it properly (or fail to boot). arm64 has had the same mechanism for a while, and nobody ever broke it... Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier --- arch/arm/kvm/coproc.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c index 9aa462ec9c56..40d6db1ca4a8 100644 --- a/arch/arm/kvm/coproc.c +++ b/arch/arm/kvm/coproc.c @@ -381,17 +381,26 @@ static const struct coproc_reg cp15_regs[] = { { CRn(15), CRm( 0), Op1( 4), Op2( 0), is32, access_cbar}, }; +static int check_reg_table(const struct coproc_reg *table, unsigned int n) +{ + unsigned int i; + + for (i = 1; i < n; i++) { + if (cmp_reg(&table[i-1], &table[i]) >= 0) { + kvm_err("reg table %p out of order (%d)\n", table, i - 1); + return 1; + } + } + + return 0; +} + /* Target specific emulation tables */ static struct kvm_coproc_target_table *target_tables[KVM_ARM_NUM_TARGETS]; void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table) { - unsigned int i; - - for (i = 1; i < table->num; i++) - BUG_ON(cmp_reg(&table->table[i-1], - &table->table[i]) >= 0); - + BUG_ON(check_reg_table(table->table, table->num)); target_tables[table->target] = table; } @@ -1210,8 +1219,8 @@ void kvm_coproc_table_init(void) unsigned int i; /* Make sure tables are unique and in order. */ - for (i = 1; i < ARRAY_SIZE(cp15_regs); i++) - BUG_ON(cmp_reg(&cp15_regs[i-1], &cp15_regs[i]) >= 0); + BUG_ON(check_reg_table(cp15_regs, ARRAY_SIZE(cp15_regs))); + BUG_ON(check_reg_table(invariant_cp15, ARRAY_SIZE(invariant_cp15))); /* We abuse the reset function to overwrite the table itself. */ for (i = 0; i < ARRAY_SIZE(invariant_cp15); i++) -- 2.20.1