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Rajnesh Kanwal 74112400df target/riscv: More accurately model priv mode filtering. 
In case of programmable counters configured to count inst/cycles
we often end-up with counter not incrementing at all from kernel's
perspective.

For example:
- Kernel configures hpm3 to count instructions and sets hpmcounter
  to -10000 and all modes except U mode are inhibited.
- In QEMU we configure a timer to expire after ~10000 instructions.
- Problem is, it's often the case that kernel might not even schedule
  Umode task and we hit the timer callback in QEMU.
- In the timer callback we inject the interrupt into kernel, kernel
  runs the handler and reads hpmcounter3 value.
- Given QEMU maintains individual counters to count for each privilege
  mode, and given umode never ran, the umode counter didn't increment
  and QEMU returns same value as was programmed by the kernel when
  starting the counter.
- Kernel checks for overflow using previous and current value of the
  counter and reprograms the counter given there wasn't an overflow
  as per the counter value. (Which itself is a problem. We have QEMU
  telling kernel that counter3 overflowed but the counter value
  returned by QEMU doesn't seem to reflect that.).

This change makes sure that timer is reprogrammed from the handler
if the counter didn't overflow based on the counter value.

Second, this change makes sure that whenever the counter is read,
it's value is updated to reflect the latest count.

Signed-off-by: Rajnesh Kanwal <rkanwal@rivosinc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240711-smcntrpmf_v7-v8-11-b7c38ae7b263@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
 		2024-07-18 12:08:45 +10:00
..
insn_trans target/riscv: Add amocas.[b|h] for Zabha 2024-07-18 12:00:42 +10:00
kvm target/riscv/kvm: update KVM regs to Linux 6.10-rc5 2024-07-18 12:08:44 +10:00
tcg target/riscv: Add zcmop extension 2024-07-18 12:00:42 +10:00
Kconfig kconfig: express dependency of individual boards on libfdt 2024-05-10 15:45:15 +02:00
XVentanaCondOps.decode target/riscv: Add XVentanaCondOps custom extension 2022-02-16 12:24:18 +10:00
arch_dump.c target/riscv: Fix format for comments 2023-05-05 10:49:50 +10:00
bitmanip_helper.c target/riscv: rvk: add support for zbkx extension 2022-04-29 10:47:45 +10:00
common-semi-target.h semihosting: Split out common-semi-target.h 2022-06-28 04:35:07 +05:30
cpu-param.h target: Define TCG_GUEST_DEFAULT_MO in 'cpu-param.h' 2024-04-26 15:31:37 +02:00
cpu-qom.h target/riscv: add rv32i, rv32e and rv64e CPUs 2024-02-09 20:49:41 +10:00
cpu.c target/riscv: Add cycle & instret privilege mode filtering properties 2024-07-18 12:08:44 +10:00
cpu.h target/riscv: Save counter values during countinhibit update 2024-07-18 12:08:44 +10:00
cpu_bits.h target/riscv: Add cycle & instret privilege mode filtering support 2024-07-18 12:08:44 +10:00
cpu_cfg.h target/riscv: Add cycle & instret privilege mode filtering properties 2024-07-18 12:08:44 +10:00
cpu_helper.c target/riscv: Implement privilege mode filtering for cycle/instret 2024-07-18 12:08:44 +10:00
cpu_user.h Supply missing header guards 2019-06-12 13:20:21 +02:00
cpu_vendorid.h target/riscv: add Ventana's Veyron V1 CPU 2023-05-05 10:49:50 +10:00
crypto_helper.c target/riscv: Use accelerated helper for AES64KS1I 2023-09-11 11:45:55 +10:00
csr.c target/riscv: More accurately model priv mode filtering. 2024-07-18 12:08:45 +10:00
debug.c target/riscv: Apply modularized matching conditions for icount trigger 2024-06-27 13:09:16 +10:00
debug.h exec: Declare CPUBreakpoint/CPUWatchpoint type in 'breakpoint.h' header 2024-04-26 17:03:05 +02:00
fpu_helper.c target/riscv: Fix froundnx.h nanbox check 2024-06-26 23:02:35 +10:00
gdbstub.c riscv, gdbstub.c: fix reg_width in ricsv_gen_dynamic_vector_feature() 2024-06-03 11:12:12 +10:00
helper.h target/riscv: Raise exceptions on wrs.nto 2024-06-03 11:12:11 +10:00
insn16.decode target/riscv: Add zcmop extension 2024-07-18 12:00:42 +10:00
insn32.decode target/riscv: Add amocas.[b|h] for Zabha 2024-07-18 12:00:42 +10:00
instmap.h target/riscv: Update [m|h]tinst CSR in riscv_cpu_do_interrupt() 2022-09-07 09:18:32 +02:00
internals.h target: Set TCGCPUOps::cpu_exec_halt to target's has_work implementation 2024-07-11 11:41:34 +01:00
m128_helper.c target/helpers: Remove unnecessary 'qemu/main-loop.h' header 2023-08-31 19:47:43 +02:00
machine.c target/riscv: Save counter values during countinhibit update 2024-07-18 12:08:44 +10:00
meson.build riscv: thead: Add th.sxstatus CSR emulation 2024-06-03 11:12:12 +10:00
monitor.c riscv: spelling fixes 2023-09-08 13:08:52 +03:00
op_helper.c target/riscv: Combine set_mode and set_virt functions. 2024-07-18 12:08:44 +10:00
pmp.c exec/cpu: Extract page-protection definitions to page-protection.h 2024-05-06 11:17:15 +02:00
pmp.h target/riscv/pmp: Use hwaddr instead of target_ulong for RV32 2024-01-10 18:47:46 +10:00
pmu.c target/riscv: More accurately model priv mode filtering. 2024-07-18 12:08:45 +10:00
pmu.h target/riscv: More accurately model priv mode filtering. 2024-07-18 12:08:45 +10:00
riscv-qmp-cmds.c target: Improve error reporting for CpuModelInfo member @props 2024-03-12 14:03:00 +01:00
sbi_ecall_interface.h target/riscv/kvm: implement SBI debug console (DBCN) calls 2024-06-03 11:12:11 +10:00
th_csr.c riscv: thead: Add th.sxstatus CSR emulation 2024-06-03 11:12:12 +10:00
time_helper.c target/riscv: Simplify type conversion for CPURISCVState 2023-05-05 10:49:49 +10:00
time_helper.h target/riscv: Simplify type conversion for CPURISCVState 2023-05-05 10:49:49 +10:00
trace-events target/riscv: Add ePMP CSR access functions 2021-05-11 20:02:06 +10:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
translate.c target/riscv: Move gen_cmpxchg before adding amocas.[b|h] 2024-07-18 12:00:42 +10:00
vcrypto_helper.c target/riscv/vector_helpers: do early exit when vstart >= vl 2024-03-22 15:20:02 +10:00
vector_helper.c exec/cpu: Extract page-protection definitions to page-protection.h 2024-05-06 11:17:15 +02:00
vector_internals.c target/riscv: Fix the element agnostic function problem 2024-06-03 11:12:12 +10:00
vector_internals.h target/riscv/vector_helpers: do early exit when vstart >= vl 2024-03-22 15:20:02 +10:00
xthead.decode RISC-V: Adding XTheadFmv ISA extension 2023-02-07 08:19:23 +10:00
zce_helper.c target/riscv: add support for Zcmt extension 2023-05-05 10:49:50 +10:00