From: Haozhong Zhang <haozhong.zh...@intel.com>
This patch exhances kvm-intel module to enable VMX TSC scaling and
collects information of TSC scaling ratio during initialization.
Signed-off-by: Haozhong Zhang <haozhong.zh...@intel.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
(cherry-picked from commit 64903d6195cbfb051ce339d30848cc64babdba12)
Signed-off-by: Denis Plotnikov <dplotni...@virtuozzo.com>
Signed-off-by: Roman Kagan <rka...@virtuozzo.com>
---
arch/x86/include/asm/vmx.h | 4 +++-
arch/x86/kvm/vmx.c | 17 ++++++++++++++++-
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 8530b93..ebe7cf9d 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -70,7 +70,7 @@
#define SECONDARY_EXEC_ENABLE_INVPCID 0x00001000
#define SECONDARY_EXEC_SHADOW_VMCS 0x00004000
#define SECONDARY_EXEC_ENABLE_PML 0x00020000
-
+#define SECONDARY_EXEC_TSC_SCALING 0x02000000
#define PIN_BASED_EXT_INTR_MASK 0x00000001
#define PIN_BASED_NMI_EXITING 0x00000008
@@ -163,6 +163,8 @@ enum vmcs_field {
EOI_EXIT_BITMAP3_HIGH = 0x00002023,
VMREAD_BITMAP = 0x00002026,
VMWRITE_BITMAP = 0x00002028,
+ TSC_MULTIPLIER = 0x00002032,
+ TSC_MULTIPLIER_HIGH = 0x00002033,
GUEST_PHYSICAL_ADDRESS = 0x00002400,
GUEST_PHYSICAL_ADDRESS_HIGH = 0x00002401,
VMCS_LINK_POINTER = 0x00002800,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f61433a..ab8a678 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -104,6 +104,8 @@ module_param(nested, bool, S_IRUGO);
static bool __read_mostly enable_pml = 1;
module_param_named(pml, enable_pml, bool, S_IRUGO);
+#define KVM_VMX_TSC_MULTIPLIER_MAX 0xffffffffffffffffULL
+
#define KVM_GUEST_CR0_MASK (X86_CR0_NW | X86_CR0_CD)
#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST (X86_CR0_WP | X86_CR0_NE)
#define KVM_VM_CR0_ALWAYS_ON \
@@ -1071,6 +1073,12 @@ static inline bool cpu_has_vmx_pml(void)
return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_PML;
}
+static inline bool cpu_has_vmx_tsc_scaling(void)
+{
+ return vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_TSC_SCALING;
+}
+
static inline bool report_flexpriority(void)
{
return flexpriority_enabled;
@@ -2877,7 +2885,8 @@ static __init int setup_vmcs_config(struct vmcs_config
*vmcs_conf)
SECONDARY_EXEC_APIC_REGISTER_VIRT |
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
SECONDARY_EXEC_SHADOW_VMCS |
- SECONDARY_EXEC_ENABLE_PML;
+ SECONDARY_EXEC_ENABLE_PML |
+ SECONDARY_EXEC_TSC_SCALING;
if (adjust_vmx_controls(min2, opt2,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
@@ -5840,6 +5849,12 @@ static __init int hardware_setup(void)
if (nested)
nested_vmx_setup_ctls_msrs();
+ if (cpu_has_vmx_tsc_scaling()) {
+ kvm_has_tsc_control = true;
+ kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
+ kvm_tsc_scaling_ratio_frac_bits = 48;
+ }
+
vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
--
2.7.4
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