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target/riscv: Fix CSR perm checking for HS mode 

Update the CSR permission checking to work correctly when we are in
HS-mode.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Alistair Francis 2020-01-31 17:01:56 -08:00 committed by Palmer Dabbelt
parent c7b1bbc80f
commit 0a42f4c440
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1 changed files with 14 additions and 4 deletions
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18
target/riscv/csr.c
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@ -801,12 +801,22 @@ int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value,
/* check privileges and return -1 if check fails */
#if !defined(CONFIG_USER_ONLY)
int csr_priv = get_field(csrno, 0x300);
int effective_priv = env->priv;
int read_only = get_field(csrno, 0xC00) == 3;
if ((!env->debugger) && (env->priv < csr_priv)) {
return -1;
if (riscv_has_ext(env, RVH) &&
env->priv == PRV_S &&
!riscv_cpu_virt_enabled(env)) {
/*
* We are in S mode without virtualisation, therefore we are in HS Mode.
* Add 1 to the effective privledge level to allow us to access the
* Hypervisor CSRs.
*/
effective_priv++;
}
if (write_mask && read_only) {
if ((write_mask && read_only) ||
(!env->debugger && (effective_priv < get_field(csrno, 0x300)))) {
return -1;
}
#endif