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| author | Liran Alon | 2020-03-12 17:54:30 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2020-06-10 18:09:53 +0200 |
| commit | d6048bfd12e24a0980ba2040cfaa2b101df3fa16 (patch) | |
| tree | f2b1a95464637316cb61b8f14073511fd018b00d /hw/i386/vmport.c | |
| parent | i386/cpu: Store LAPIC bus frequency in CPU structure (diff) | |
| download | qemu-d6048bfd12e24a0980ba2040cfaa2b101df3fa16.tar.gz qemu-d6048bfd12e24a0980ba2040cfaa2b101df3fa16.tar.xz qemu-d6048bfd12e24a0980ba2040cfaa2b101df3fa16.zip | |
hw/i386/vmport: Add support for CMD_GETHZ
This command returns to guest information on LAPIC bus frequency and TSC
frequency.
One can see how this interface is used by Linux vmware_platform_setup()
introduced in Linux commit 88b094fb8d4f ("x86: Hypervisor detection and
get tsc_freq from hypervisor").
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-16-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/i386/vmport.c')
| -rw-r--r-- | hw/i386/vmport.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/hw/i386/vmport.c b/hw/i386/vmport.c index 21d4ff048a..309cfd105b 100644 --- a/hw/i386/vmport.c +++ b/hw/i386/vmport.c @@ -174,6 +174,24 @@ static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr) return ram_size; } +static uint32_t vmport_cmd_get_hz(void *opaque, uint32_t addr) +{ + X86CPU *cpu = X86_CPU(current_cpu); + + if (cpu->env.tsc_khz && cpu->env.apic_bus_freq) { + uint64_t tsc_freq = (uint64_t)cpu->env.tsc_khz * 1000; + + cpu->env.regs[R_ECX] = cpu->env.apic_bus_freq; + cpu->env.regs[R_EBX] = (uint32_t)(tsc_freq >> 32); + cpu->env.regs[R_EAX] = (uint32_t)tsc_freq; + } else { + /* Signal cmd as not supported */ + cpu->env.regs[R_EBX] = UINT32_MAX; + } + + return cpu->env.regs[R_EAX]; +} + static uint32_t vmport_cmd_get_vcpu_info(void *opaque, uint32_t addr) { X86CPU *cpu = X86_CPU(current_cpu); @@ -211,6 +229,7 @@ static void vmport_realizefn(DeviceState *dev, Error **errp) vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL); if (s->compat_flags & VMPORT_COMPAT_CMDS_V2) { vmport_register(VMPORT_CMD_GETBIOSUUID, vmport_cmd_get_bios_uuid, NULL); + vmport_register(VMPORT_CMD_GETHZ, vmport_cmd_get_hz, NULL); vmport_register(VMPORT_CMD_GET_VCPU_INFO, vmport_cmd_get_vcpu_info, NULL); } |