mirror of https://github.com/xemu-project/xemu.git
target/riscv/kvm: fix timebase-frequency when using KVM acceleration
The timebase-frequency of guest OS should be the same with host machine. The timebase-frequency value in DTS should be got from hypervisor when using KVM acceleration. Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com> Message-ID: <20240314061510.9800-1-yongxuan.wang@sifive.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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@ -711,6 +711,8 @@ static void create_fdt_sockets(RISCVVirtState *s, const MemMapEntry *memmap,
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qemu_fdt_add_subnode(ms->fdt, "/cpus");
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qemu_fdt_setprop_cell(ms->fdt, "/cpus", "timebase-frequency",
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kvm_enabled() ?
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kvm_riscv_get_timebase_frequency(first_cpu) :
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RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ);
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qemu_fdt_setprop_cell(ms->fdt, "/cpus", "#size-cells", 0x0);
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qemu_fdt_setprop_cell(ms->fdt, "/cpus", "#address-cells", 0x1);
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@ -739,6 +739,15 @@ static void kvm_riscv_put_regs_timer(CPUState *cs)
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env->kvm_timer_dirty = false;
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}
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uint64_t kvm_riscv_get_timebase_frequency(CPUState *cs)
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{
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uint64_t reg;
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KVM_RISCV_GET_TIMER(cs, frequency, reg);
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return reg;
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}
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static int kvm_riscv_get_regs_vector(CPUState *cs)
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{
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RISCVCPU *cpu = RISCV_CPU(cs);
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@ -28,5 +28,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
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void riscv_kvm_aplic_request(void *opaque, int irq, int level);
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int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
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void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp);
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uint64_t kvm_riscv_get_timebase_frequency(CPUState *cs);
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#endif
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