* [PATCH 1/2] arm64/kvm: Drop unnecessary check in kvm_vcpu_preferred_target()
@ 2020-08-25 6:18 ` Gavin Shan
0 siblings, 0 replies; 4+ messages in thread
From: Gavin Shan @ 2020-08-25 6:18 UTC (permalink / raw)
To: kvmarm; +Cc: linux-kernel, maz, suzuki.poulose
Since commit <bca556ac468a> ("arm64/kvm: Add generic v8 KVM target"),
there is no negative number returned from kvm_target_cpu(). So it's
not needed to validate its return value in kvm_vcpu_preferred_target()
and this just drops the unnecessary check.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/guest.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index dfb5218137ca..2365449ea32e 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -835,9 +835,6 @@ int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
{
int target = kvm_target_cpu();
- if (target < 0)
- return -ENODEV;
-
memset(init, 0, sizeof(*init));
/*
--
2.23.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 1/2] arm64/kvm: Drop unnecessary check in kvm_vcpu_preferred_target()
@ 2020-08-25 6:18 ` Gavin Shan
0 siblings, 0 replies; 4+ messages in thread
From: Gavin Shan @ 2020-08-25 6:18 UTC (permalink / raw)
To: kvmarm; +Cc: maz, linux-kernel
Since commit <bca556ac468a> ("arm64/kvm: Add generic v8 KVM target"),
there is no negative number returned from kvm_target_cpu(). So it's
not needed to validate its return value in kvm_vcpu_preferred_target()
and this just drops the unnecessary check.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/guest.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index dfb5218137ca..2365449ea32e 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -835,9 +835,6 @@ int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
{
int target = kvm_target_cpu();
- if (target < 0)
- return -ENODEV;
-
memset(init, 0, sizeof(*init));
/*
--
2.23.0
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] arm64/kvm: Drop checking target CPU type on initializing module
2020-08-25 6:18 ` Gavin Shan
@ 2020-08-25 6:18 ` Gavin Shan
-1 siblings, 0 replies; 4+ messages in thread
From: Gavin Shan @ 2020-08-25 6:18 UTC (permalink / raw)
To: kvmarm; +Cc: linux-kernel, maz, suzuki.poulose
The target CPU type is validated when KVM module is initialized.
However, we always have a valid target CPU type since commit
<bca556ac468a> ("arm64/kvm: Add generic v8 KVM target").
So it's unnecessary to validate the target CPU type at that time
and this just drops it.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/arm.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 691d21e4c717..faf4bc208a4a 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1561,11 +1561,6 @@ static int init_hyp_mode(void)
return err;
}
-static void check_kvm_target_cpu(void *ret)
-{
- *(int *)ret = kvm_target_cpu();
-}
-
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
{
struct kvm_vcpu *vcpu;
@@ -1625,7 +1620,6 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
int kvm_arch_init(void *opaque)
{
int err;
- int ret, cpu;
bool in_hyp_mode;
if (!is_hyp_mode_available()) {
@@ -1640,14 +1634,6 @@ int kvm_arch_init(void *opaque)
return -ENODEV;
}
- for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
- if (ret < 0) {
- kvm_err("Error, CPU %d not supported!\n", cpu);
- return -ENODEV;
- }
- }
-
err = init_common_resources();
if (err)
return err;
--
2.23.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] arm64/kvm: Drop checking target CPU type on initializing module
@ 2020-08-25 6:18 ` Gavin Shan
0 siblings, 0 replies; 4+ messages in thread
From: Gavin Shan @ 2020-08-25 6:18 UTC (permalink / raw)
To: kvmarm; +Cc: maz, linux-kernel
The target CPU type is validated when KVM module is initialized.
However, we always have a valid target CPU type since commit
<bca556ac468a> ("arm64/kvm: Add generic v8 KVM target").
So it's unnecessary to validate the target CPU type at that time
and this just drops it.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kvm/arm.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 691d21e4c717..faf4bc208a4a 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1561,11 +1561,6 @@ static int init_hyp_mode(void)
return err;
}
-static void check_kvm_target_cpu(void *ret)
-{
- *(int *)ret = kvm_target_cpu();
-}
-
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
{
struct kvm_vcpu *vcpu;
@@ -1625,7 +1620,6 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
int kvm_arch_init(void *opaque)
{
int err;
- int ret, cpu;
bool in_hyp_mode;
if (!is_hyp_mode_available()) {
@@ -1640,14 +1634,6 @@ int kvm_arch_init(void *opaque)
return -ENODEV;
}
- for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
- if (ret < 0) {
- kvm_err("Error, CPU %d not supported!\n", cpu);
- return -ENODEV;
- }
- }
-
err = init_common_resources();
if (err)
return err;
--
2.23.0
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-08-25 6:19 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-08-25 6:18 [PATCH 1/2] arm64/kvm: Drop unnecessary check in kvm_vcpu_preferred_target() Gavin Shan
2020-08-25 6:18 ` Gavin Shan
2020-08-25 6:18 ` [PATCH 2/2] arm64/kvm: Drop checking target CPU type on initializing module Gavin Shan
2020-08-25 6:18 ` Gavin Shan
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