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[PATCH 13/14] hw/i386/vmport: Add support for CMD_GETHZ
From: |
Liran Alon |
Subject: |
[PATCH 13/14] hw/i386/vmport: Add support for CMD_GETHZ |
Date: |
Tue, 10 Mar 2020 01:54:10 +0200 |
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 <address@hidden>
Signed-off-by: Liran Alon <address@hidden>
---
hw/i386/vmport.c | 19 +++++++++++++++++++
include/hw/i386/pc.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/hw/i386/vmport.c b/hw/i386/vmport.c
index 2b0a623f19c1..95d4a23ce9ba 100644
--- a/hw/i386/vmport.c
+++ b/hw/i386/vmport.c
@@ -150,6 +150,24 @@ 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_time(void *opaque, uint32_t addr)
{
X86CPU *cpu = X86_CPU(current_cpu);
@@ -237,6 +255,7 @@ static void vmport_realizefn(DeviceState *dev, Error **errp)
vmport_register(VMPORT_CMD_GETBIOSUUID, vmport_cmd_get_bios_uuid, NULL);
vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
vmport_register(VMPORT_CMD_GETTIME, vmport_cmd_time, NULL);
+ vmport_register(VMPORT_CMD_GETHZ, vmport_cmd_get_hz, NULL);
vmport_register(VMPORT_CMD_GETTIMEFULL, vmport_cmd_time_full, NULL);
vmport_register(VMPORT_CMD_GET_VCPU_INFO, vmport_cmd_get_vcpu_info, NULL);
}
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index e880ca39ee3b..679bf429c6a5 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -146,6 +146,7 @@ typedef enum {
VMPORT_CMD_VMMOUSE_DATA = 39,
VMPORT_CMD_VMMOUSE_STATUS = 40,
VMPORT_CMD_VMMOUSE_COMMAND = 41,
+ VMPORT_CMD_GETHZ = 45,
VMPORT_CMD_GETTIMEFULL = 46,
VMPORT_CMD_GET_VCPU_INFO = 68,
VMPORT_ENTRIES
--
2.20.1
- [PATCH 10/14] hw/i386/vmport: Add support for CMD_GET_VCPU_INFO, (continued)
[PATCH 14/14] hw/i386/vmport: Assert vmport initialized before registering commands, Liran Alon, 2020/03/09
[PATCH 13/14] hw/i386/vmport: Add support for CMD_GETHZ,
Liran Alon <=
[PATCH 06/14] hw/i386/vmport: Define enum for all commands, Liran Alon, 2020/03/09
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Michael S. Tsirkin, 2020/03/10
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Liran Alon, 2020/03/10
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Michael S. Tsirkin, 2020/03/10
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Liran Alon, 2020/03/10
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Michael S. Tsirkin, 2020/03/10
- Re: [PATCH 06/14] hw/i386/vmport: Define enum for all commands, Liran Alon, 2020/03/10
[PATCH 07/14] hw/i386/vmport: Add support for CMD_GETBIOSUUID, Liran Alon, 2020/03/09