On 1/19/24 04:21, Deepak Gupta wrote:
On Tue, Jan 9, 2024 at 2:31 AM Alexey Baturo <baturo.ale...@gmail.com> wrote:
From: Alexey Baturo <baturo.ale...@gmail.com>
Signed-off-by: Alexey Baturo <baturo.ale...@gmail.com>
---
+
+bool riscv_cpu_virt_mem_enabled(CPURISCVState *env)
+{
+ bool virt_mem_en = false;
+#ifndef CONFIG_USER_ONLY
+ int satp_mode = 0;
+ int priv_mode = cpu_address_mode(env);
+ /* Get current PMM field */
+ if (riscv_cpu_mxl(env) == MXL_RV32) {
+ satp_mode = get_field(env->satp, SATP32_MODE);
+ } else {
+ satp_mode = get_field(env->satp, SATP64_MODE);
+ }
+ virt_mem_en = ((satp_mode != VM_1_10_MBARE) && (priv_mode != PRV_M));
+#endif
+ return virt_mem_en;
Obsessing a little bit on how to test PM enabled binaries with qemu-user.
If we return false above then we're not allowed to test binaries with
pointer masking enabled with qemu-user.
That use case is not required?
In a previous round I suggested that the ifdefs are not necessary.
But for now it will always be off for qemu-user.
At some point pointer masking will be in hardware, and the kernel will gain support for
it, and there will likely be a prctl() added for it. At the point the kernel finalizes
the API, you will be able to enable pointer masking for qemu-user.
r~