[PATCH RFC 6/7] Doc/KVM: introduce a new cpuid bit for kvm pvtimer

2017-12-08 Thread Quan Xu
From: Ben Luo 

KVM_FEATURE_PV_TIMER enables guest to check whether pvtimer
can be enabled in guest.

Signed-off-by: Yang Zhang 
Signed-off-by: Quan Xu 
Signed-off-by: Ben Luo 
---
 Documentation/virtual/kvm/cpuid.txt  |4 
 arch/x86/include/uapi/asm/kvm_para.h |1 +
 arch/x86/kvm/cpuid.c |1 +
 3 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/cpuid.txt 
b/Documentation/virtual/kvm/cpuid.txt
index 3c65feb..b26b31c 100644
--- a/Documentation/virtual/kvm/cpuid.txt
+++ b/Documentation/virtual/kvm/cpuid.txt
@@ -54,6 +54,10 @@ KVM_FEATURE_PV_UNHALT  || 7 || guest checks 
this feature bit
||   || before enabling paravirtualized
||   || spinlock support.
 --
+KVM_FEATURE_PV_TIMER   || 8 || guest checks this feature bit
+   ||   || before enabling paravirtualized
+   ||   || timer support.
+--
 KVM_FEATURE_CLOCKSOURCE_STABLE_BIT ||24 || host will warn if no guest-side
||   || per-cpu warps are expected in
||   || kvmclock.
diff --git a/arch/x86/include/uapi/asm/kvm_para.h 
b/arch/x86/include/uapi/asm/kvm_para.h
index 3dd6116..46734a8 100644
--- a/arch/x86/include/uapi/asm/kvm_para.h
+++ b/arch/x86/include/uapi/asm/kvm_para.h
@@ -25,6 +25,7 @@
 #define KVM_FEATURE_STEAL_TIME 5
 #define KVM_FEATURE_PV_EOI 6
 #define KVM_FEATURE_PV_UNHALT  7
+#define KVM_FEATURE_PV_TIMER   8
 
 /* The last 8 bits are used to indicate how to interpret the flags field
  * in pvclock structure. If no bits are set, all flags are ignored.
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0099e10..e02fd23 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -593,6 +593,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 
*entry, u32 function,
 (1 << KVM_FEATURE_CLOCKSOURCE2) |
 (1 << KVM_FEATURE_ASYNC_PF) |
 (1 << KVM_FEATURE_PV_EOI) |
+(1 << KVM_FEATURE_PV_TIMER) |
 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
 (1 << KVM_FEATURE_PV_UNHALT);
 
-- 
1.7.1



[PATCH RFC 6/7] Doc/KVM: introduce a new cpuid bit for kvm pvtimer

2017-12-08 Thread Quan Xu
From: Ben Luo 

KVM_FEATURE_PV_TIMER enables guest to check whether pvtimer
can be enabled in guest.

Signed-off-by: Yang Zhang 
Signed-off-by: Quan Xu 
Signed-off-by: Ben Luo 
---
 Documentation/virtual/kvm/cpuid.txt  |4 
 arch/x86/include/uapi/asm/kvm_para.h |1 +
 arch/x86/kvm/cpuid.c |1 +
 3 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/Documentation/virtual/kvm/cpuid.txt 
b/Documentation/virtual/kvm/cpuid.txt
index 3c65feb..b26b31c 100644
--- a/Documentation/virtual/kvm/cpuid.txt
+++ b/Documentation/virtual/kvm/cpuid.txt
@@ -54,6 +54,10 @@ KVM_FEATURE_PV_UNHALT  || 7 || guest checks 
this feature bit
||   || before enabling paravirtualized
||   || spinlock support.
 --
+KVM_FEATURE_PV_TIMER   || 8 || guest checks this feature bit
+   ||   || before enabling paravirtualized
+   ||   || timer support.
+--
 KVM_FEATURE_CLOCKSOURCE_STABLE_BIT ||24 || host will warn if no guest-side
||   || per-cpu warps are expected in
||   || kvmclock.
diff --git a/arch/x86/include/uapi/asm/kvm_para.h 
b/arch/x86/include/uapi/asm/kvm_para.h
index 3dd6116..46734a8 100644
--- a/arch/x86/include/uapi/asm/kvm_para.h
+++ b/arch/x86/include/uapi/asm/kvm_para.h
@@ -25,6 +25,7 @@
 #define KVM_FEATURE_STEAL_TIME 5
 #define KVM_FEATURE_PV_EOI 6
 #define KVM_FEATURE_PV_UNHALT  7
+#define KVM_FEATURE_PV_TIMER   8
 
 /* The last 8 bits are used to indicate how to interpret the flags field
  * in pvclock structure. If no bits are set, all flags are ignored.
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0099e10..e02fd23 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -593,6 +593,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 
*entry, u32 function,
 (1 << KVM_FEATURE_CLOCKSOURCE2) |
 (1 << KVM_FEATURE_ASYNC_PF) |
 (1 << KVM_FEATURE_PV_EOI) |
+(1 << KVM_FEATURE_PV_TIMER) |
 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
 (1 << KVM_FEATURE_PV_UNHALT);
 
-- 
1.7.1