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target/riscv: Do not allow sfence.vma from user mode

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The 'sfence.vma' instruction is privileged, and should only ever be allowed
when executing in supervisor mode or higher.

Backports commit b86f4167630802128d94f3c89043d97d2f4c2546 from qemu
This commit is contained in:
Jonathan Behrens 2019-05-28 18:29:36 -04:00 committed by Lioncash
parent 67f0af4282
commit 25c0333213
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 3 deletions
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7
qemu/target/riscv/op_helper.c
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@ -144,9 +144,10 @@ void helper_tlb_flush(CPURISCVState *env)
{
RISCVCPU *cpu = riscv_env_get_cpu(env);
CPUState *cs = CPU(cpu);
if (env->priv == PRV_S &&
env->priv_ver >= PRIV_VERSION_1_10_0 &&
get_field(env->mstatus, MSTATUS_TVM)) {
if (!(env->priv >= PRV_S) ||
(env->priv == PRV_S &&
env->priv_ver >= PRIV_VERSION_1_10_0 &&
get_field(env->mstatus, MSTATUS_TVM))) {
riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
} else {
tlb_flush(cs);