[Stable-8.2.3 71/87] target/riscv/kvm: fix timebase-frequency when using KVM acceleration

[Michael Tokarev]

From: Yong-Xuan Wang <yongxuan.wang@sifive.com>

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>
(cherry picked from commit 385e575cd5ab2436c123e4b7f8c9b383a64c0dbe)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: context fix due to missing other changes in this area in 8.2.x)

diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index d2eac24156..7e802c3837 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -743,6 +743,8 @@ static void create_fdt_sockets(RISCVVirtState *s, const 
MemMapEntry *memmap,
 
     qemu_fdt_add_subnode(ms->fdt, "/cpus");
     qemu_fdt_setprop_cell(ms->fdt, "/cpus", "timebase-frequency",
+                          kvm_enabled() ?
+                          kvm_riscv_get_timebase_frequency(first_cpu) :
                           RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ);
     qemu_fdt_setprop_cell(ms->fdt, "/cpus", "#size-cells", 0x0);
     qemu_fdt_setprop_cell(ms->fdt, "/cpus", "#address-cells", 0x1);
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 117e33cf90..c1675158fe 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -684,6 +684,15 @@ static void kvm_riscv_put_regs_timer(CPUState *cs)
     env->kvm_timer_dirty = false;
 }
 
+uint64_t kvm_riscv_get_timebase_frequency(CPUState *cs)
+{
+    uint64_t reg;
+
+    KVM_RISCV_GET_TIMER(cs, frequency, reg);
+
+    return reg;
+}
+
 typedef struct KVMScratchCPU {
     int kvmfd;
     int vmfd;
diff --git a/target/riscv/kvm/kvm_riscv.h b/target/riscv/kvm/kvm_riscv.h
index 8329cfab82..4728281632 100644
--- a/target/riscv/kvm/kvm_riscv.h
+++ b/target/riscv/kvm/kvm_riscv.h
@@ -27,5 +27,6 @@ void kvm_riscv_aia_create(MachineState *machine, uint64_t 
group_shift,
                           uint64_t guest_num);
 void riscv_kvm_aplic_request(void *opaque, int irq, int level);
 int kvm_riscv_sync_mpstate_to_kvm(RISCVCPU *cpu, int state);
+uint64_t kvm_riscv_get_timebase_frequency(CPUState *cs);
 
 #endif
-- 
2.39.2