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[PATCH v3 05/19] target/riscv/cpu.c: restrict 'marchid' value
From: |
Daniel Henrique Barboza |
Subject: |
[PATCH v3 05/19] target/riscv/cpu.c: restrict 'marchid' value |
Date: |
Thu, 22 Jun 2023 10:56:46 -0300 |
'marchid' shouldn't be set to a different value as previously set for
named CPUs.
For all other CPUs it shouldn't be freely set either - the spec requires
that 'marchid' can't have the MSB (most significant bit) set and every
other bit set to zero, i.e. 0x80000000 is an invalid 'marchid' value for
32 bit CPUs.
As with 'mimpid', setting a default value based on the current QEMU
version is not a good idea because it implies that the CPU
implementation changes from one QEMU version to the other. Named CPUs
should set 'marchid' to a meaningful value instead, and generic CPUs can
set to any valid value.
For the 'veyron-v1' CPU this is the error thrown if 'marchid' is set to
a different val:
$ ./build/qemu-system-riscv64 -M virt -nographic -cpu
veyron-v1,marchid=0x80000000
qemu-system-riscv64: can't apply global veyron-v1-riscv-cpu.marchid=0x80000000:
Unable to change veyron-v1-riscv-cpu marchid (0x8000000000010000)
And, for generics CPUs, this is the error when trying to set to an
invalid val:
$ ./build/qemu-system-riscv64 -M virt -nographic -cpu
rv64,marchid=0x8000000000000000
qemu-system-riscv64: can't apply global
rv64-riscv-cpu.marchid=0x8000000000000000:
Unable to set marchid with MSB (64) bit set and the remaining bits zero
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
target/riscv/cpu.c | 60 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 53 insertions(+), 7 deletions(-)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 33cc28acf1..4768dcdf49 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -38,11 +38,6 @@
#include "tcg/tcg.h"
/* RISC-V CPU definitions */
-
-#define RISCV_CPU_MARCHID ((QEMU_VERSION_MAJOR << 16) | \
- (QEMU_VERSION_MINOR << 8) | \
- (QEMU_VERSION_MICRO))
-
static const char riscv_single_letter_exts[] = "IEMAFDQCPVH";
struct isa_ext_data {
@@ -1737,8 +1732,6 @@ static void riscv_cpu_add_user_properties(Object *obj)
static Property riscv_cpu_properties[] = {
DEFINE_PROP_BOOL("debug", RISCVCPU, cfg.debug, true),
- DEFINE_PROP_UINT64("marchid", RISCVCPU, cfg.marchid, RISCV_CPU_MARCHID),
-
#ifndef CONFIG_USER_ONLY
DEFINE_PROP_UINT64("resetvec", RISCVCPU, env.resetvec, DEFAULT_RSTVEC),
#endif
@@ -1885,6 +1878,56 @@ static void cpu_get_mimpid(Object *obj, Visitor *v,
const char *name,
visit_type_bool(v, name, &value, errp);
}
+static void cpu_set_marchid(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ bool dynamic_cpu = riscv_cpu_is_dynamic(obj);
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ uint64_t prev_val = cpu->cfg.marchid;
+ uint64_t value, invalid_val;
+ uint32_t mxlen = 0;
+
+ if (!visit_type_uint64(v, name, &value, errp)) {
+ return;
+ }
+
+ if (!dynamic_cpu && prev_val != value) {
+ error_setg(errp, "Unable to change %s marchid (0x%lx)",
+ object_get_typename(obj), prev_val);
+ return;
+ }
+
+ switch (riscv_cpu_mxl(&cpu->env)) {
+ case MXL_RV32:
+ mxlen = 32;
+ break;
+ case MXL_RV64:
+ case MXL_RV128:
+ mxlen = 64;
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ invalid_val = 1LL << (mxlen - 1);
+
+ if (value == invalid_val) {
+ error_setg(errp, "Unable to set marchid with MSB (%u) bit set "
+ "and the remaining bits zero", mxlen);
+ return;
+ }
+
+ cpu->cfg.marchid = value;
+}
+
+static void cpu_get_marchid(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ bool value = RISCV_CPU(obj)->cfg.marchid;
+
+ visit_type_bool(v, name, &value, errp);
+}
+
static void riscv_cpu_class_init(ObjectClass *c, void *data)
{
RISCVCPUClass *mcc = RISCV_CPU_CLASS(c);
@@ -1922,6 +1965,9 @@ static void riscv_cpu_class_init(ObjectClass *c, void
*data)
object_class_property_add(c, "mimpid", "uint64", cpu_get_mimpid,
cpu_set_mimpid, NULL, NULL);
+ object_class_property_add(c, "marchid", "uint64", cpu_get_marchid,
+ cpu_set_marchid, NULL, NULL);
+
device_class_set_props(dc, riscv_cpu_properties);
}
--
2.41.0
- [PATCH v3 00/19] target/riscv, KVM: fixes and enhancements, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 01/19] target/riscv: skip features setup for KVM CPUs, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 02/19] hw/riscv/virt.c: skip 'mmu-type' FDT if satp mode not set, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 03/19] target/riscv/cpu.c: restrict 'mvendorid' value, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 04/19] target/riscv/cpu.c: restrict 'mimpid' value, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 08/19] target/riscv: handle mvendorid/marchid/mimpid for KVM CPUs, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 05/19] target/riscv/cpu.c: restrict 'marchid' value,
Daniel Henrique Barboza <=
- [PATCH v3 10/19] target/riscv/kvm.c: init 'misa_ext_mask' with scratch CPU, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 07/19] target/riscv: read marchid/mimpid in kvm_riscv_init_machine_ids(), Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 13/19] target/riscv/kvm.c: update KVM MISA bits, Daniel Henrique Barboza, 2023/06/22
- [PATCH v3 12/19] target/riscv: add KVM specific MISA properties, Daniel Henrique Barboza, 2023/06/22
- Re: [PATCH v3 12/19] target/riscv: add KVM specific MISA properties, Andrew Jones, 2023/06/26
[PATCH v3 11/19] target/riscv/cpu: add misa_ext_info_arr[], Daniel Henrique Barboza, 2023/06/22