From: Chao Gao <[email protected]>
This partially reverts commit b99040853738 ("KVM: Pass kvm_init()'s opaque
param to additional arch funcs") remove opaque from
kvm_arch_check_processor_compat because no one uses this opaque now.
Address conflicts for ARM (due to file movement) and manually handle RISC-V
which comes after the commit.
And changes about kvm_arch_hardware_setup() in original commit are still
needed so they are not reverted.
Signed-off-by: Chao Gao <[email protected]>
Reviewed-by: Sean Christopherson <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Acked-by: Anup Patel <[email protected]>
Acked-by: Claudio Imbrenda <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Isaku Yamahata <[email protected]>
---
arch/arm64/kvm/arm.c | 2 +-
arch/mips/kvm/mips.c | 2 +-
arch/powerpc/kvm/powerpc.c | 2 +-
arch/riscv/kvm/main.c | 2 +-
arch/s390/kvm/kvm-s390.c | 2 +-
arch/x86/kvm/x86.c | 2 +-
include/linux/kvm_host.h | 2 +-
virt/kvm/kvm_main.c | 16 +++-------------
8 files changed, 10 insertions(+), 20 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index a0188144a122..7588efbac6be 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -68,7 +68,7 @@ int kvm_arch_hardware_setup(void *opaque)
return 0;
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
return 0;
}
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a25e0b73ee70..092d09fb6a7e 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -140,7 +140,7 @@ int kvm_arch_hardware_setup(void *opaque)
return 0;
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
return 0;
}
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 191992fcb2c2..ca8ef51092c6 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -446,7 +446,7 @@ int kvm_arch_hardware_setup(void *opaque)
return 0;
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
return kvmppc_core_check_processor_compat();
}
diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c
index 1549205fe5fe..f8d6372d208f 100644
--- a/arch/riscv/kvm/main.c
+++ b/arch/riscv/kvm/main.c
@@ -20,7 +20,7 @@ long kvm_arch_dev_ioctl(struct file *filp,
return -EINVAL;
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
return 0;
}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 72bd5c9b9617..a05493f1cacf 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -251,7 +251,7 @@ int kvm_arch_hardware_enable(void)
return 0;
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
return 0;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3d9dbaf9828f..30af2bd0b4d5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11799,7 +11799,7 @@ void kvm_arch_hardware_unsetup(void)
static_call(kvm_x86_hardware_unsetup)();
}
-int kvm_arch_check_processor_compat(void *opaque)
+int kvm_arch_check_processor_compat(void)
{
struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c20f2d55840c..d4f130a9f5c8 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1442,7 +1442,7 @@ int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
int kvm_arch_hardware_setup(void *opaque);
void kvm_arch_hardware_unsetup(void);
-int kvm_arch_check_processor_compat(void *opaque);
+int kvm_arch_check_processor_compat(void);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a67e996cbf7f..a5bada53f1fe 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5697,22 +5697,14 @@ void kvm_unregister_perf_callbacks(void)
}
#endif
-struct kvm_cpu_compat_check {
- void *opaque;
- int *ret;
-};
-
-static void check_processor_compat(void *data)
+static void check_processor_compat(void *rtn)
{
- struct kvm_cpu_compat_check *c = data;
-
- *c->ret = kvm_arch_check_processor_compat(c->opaque);
+ *(int *)rtn = kvm_arch_check_processor_compat();
}
int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
struct module *module)
{
- struct kvm_cpu_compat_check c;
int r;
int cpu;
@@ -5740,10 +5732,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
if (r < 0)
goto out_free_1;
- c.ret = &r;
- c.opaque = opaque;
for_each_online_cpu(cpu) {
- smp_call_function_single(cpu, check_processor_compat, &c, 1);
+ smp_call_function_single(cpu, check_processor_compat, &r, 1);
if (r < 0)
goto out_free_2;
}
--
2.25.1
On Mon, 2022-06-27 at 14:52 -0700, [email protected] wrote:
> From: Chao Gao <[email protected]>
>
> This partially reverts commit b99040853738 ("KVM: Pass kvm_init()'s opaque
> param to additional arch funcs") remove opaque from
> kvm_arch_check_processor_compat because no one uses this opaque now.
> Address conflicts for ARM (due to file movement) and manually handle RISC-V
> which comes after the commit.
>
> And changes about kvm_arch_hardware_setup() in original commit are still
> needed so they are not reverted.
I tried to dig the history to find out why we are doing this.
IMHO it's better to give a reason why you need to revert the opaque. I guess no
one uses this opaque now doesn't mean we need to remove it?
Perhaps you should mention this is a preparation to
hardware_enable_all()/hardware_disable_all() during module loading time.
Instead of extending hardware_enable_all()/hardware_disable_all() to take the
opaque and pass to kvm_arch_check_process_compat(), just remove the opaque.
Or perhaps just merge this patch to next one?
>
> Signed-off-by: Chao Gao <[email protected]>
> Reviewed-by: Sean Christopherson <[email protected]>
> Reviewed-by: Suzuki K Poulose <[email protected]>
> Acked-by: Anup Patel <[email protected]>
> Acked-by: Claudio Imbrenda <[email protected]>
> Link: https://lore.kernel.org/r/[email protected]
> Signed-off-by: Isaku Yamahata <[email protected]>
> ---
> arch/arm64/kvm/arm.c | 2 +-
> arch/mips/kvm/mips.c | 2 +-
> arch/powerpc/kvm/powerpc.c | 2 +-
> arch/riscv/kvm/main.c | 2 +-
> arch/s390/kvm/kvm-s390.c | 2 +-
> arch/x86/kvm/x86.c | 2 +-
> include/linux/kvm_host.h | 2 +-
> virt/kvm/kvm_main.c | 16 +++-------------
> 8 files changed, 10 insertions(+), 20 deletions(-)
>
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index a0188144a122..7588efbac6be 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -68,7 +68,7 @@ int kvm_arch_hardware_setup(void *opaque)
> return 0;
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> return 0;
> }
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index a25e0b73ee70..092d09fb6a7e 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -140,7 +140,7 @@ int kvm_arch_hardware_setup(void *opaque)
> return 0;
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> return 0;
> }
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 191992fcb2c2..ca8ef51092c6 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -446,7 +446,7 @@ int kvm_arch_hardware_setup(void *opaque)
> return 0;
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> return kvmppc_core_check_processor_compat();
> }
> diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c
> index 1549205fe5fe..f8d6372d208f 100644
> --- a/arch/riscv/kvm/main.c
> +++ b/arch/riscv/kvm/main.c
> @@ -20,7 +20,7 @@ long kvm_arch_dev_ioctl(struct file *filp,
> return -EINVAL;
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> return 0;
> }
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 72bd5c9b9617..a05493f1cacf 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -251,7 +251,7 @@ int kvm_arch_hardware_enable(void)
> return 0;
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> return 0;
> }
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 3d9dbaf9828f..30af2bd0b4d5 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -11799,7 +11799,7 @@ void kvm_arch_hardware_unsetup(void)
> static_call(kvm_x86_hardware_unsetup)();
> }
>
> -int kvm_arch_check_processor_compat(void *opaque)
> +int kvm_arch_check_processor_compat(void)
> {
> struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index c20f2d55840c..d4f130a9f5c8 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1442,7 +1442,7 @@ int kvm_arch_hardware_enable(void);
> void kvm_arch_hardware_disable(void);
> int kvm_arch_hardware_setup(void *opaque);
> void kvm_arch_hardware_unsetup(void);
> -int kvm_arch_check_processor_compat(void *opaque);
> +int kvm_arch_check_processor_compat(void);
> int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
> bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu);
> int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index a67e996cbf7f..a5bada53f1fe 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -5697,22 +5697,14 @@ void kvm_unregister_perf_callbacks(void)
> }
> #endif
>
> -struct kvm_cpu_compat_check {
> - void *opaque;
> - int *ret;
> -};
> -
> -static void check_processor_compat(void *data)
> +static void check_processor_compat(void *rtn)
> {
> - struct kvm_cpu_compat_check *c = data;
> -
> - *c->ret = kvm_arch_check_processor_compat(c->opaque);
> + *(int *)rtn = kvm_arch_check_processor_compat();
> }
>
> int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
> struct module *module)
> {
> - struct kvm_cpu_compat_check c;
> int r;
> int cpu;
>
> @@ -5740,10 +5732,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
> if (r < 0)
> goto out_free_1;
>
> - c.ret = &r;
> - c.opaque = opaque;
> for_each_online_cpu(cpu) {
> - smp_call_function_single(cpu, check_processor_compat, &c, 1);
> + smp_call_function_single(cpu, check_processor_compat, &r, 1);
> if (r < 0)
> goto out_free_2;
> }
On Wed, Jul 13, 2022 at 01:55:46PM +1200,
Kai Huang <[email protected]> wrote:
> On Mon, 2022-06-27 at 14:52 -0700, [email protected] wrote:
> > From: Chao Gao <[email protected]>
> >
> > This partially reverts commit b99040853738 ("KVM: Pass kvm_init()'s opaque
> > param to additional arch funcs") remove opaque from
> > kvm_arch_check_processor_compat because no one uses this opaque now.
> > Address conflicts for ARM (due to file movement) and manually handle RISC-V
> > which comes after the commit.
> >
> > And changes about kvm_arch_hardware_setup() in original commit are still
> > needed so they are not reverted.
>
> I tried to dig the history to find out why we are doing this.
>
> IMHO it's better to give a reason why you need to revert the opaque. I guess no
> one uses this opaque now doesn't mean we need to remove it?
>
> Perhaps you should mention this is a preparation to
> hardware_enable_all()/hardware_disable_all() during module loading time.
> Instead of extending hardware_enable_all()/hardware_disable_all() to take the
> opaque and pass to kvm_arch_check_process_compat(), just remove the opaque.
>
> Or perhaps just merge this patch to next one?
Here is the updated commit message.
Partially revert "KVM: Pass kvm_init()'s opaque param to additional arch funcs"
This partially reverts commit b99040853738 ("KVM: Pass kvm_init()'s opaque
param to additional arch funcs") remove opaque from
kvm_arch_check_processor_compat because no one uses this opaque now.
Address conflicts for ARM (due to file movement) and manually handle RISC-V
which comes after the commit. The change about kvm_arch_hardware_setup()
in original commit are still needed so they are not reverted.
The current implementation enables hardware (e.g. enable VMX on all CPUs),
arch-specific initialization for VM creation, and disables hardware (in
x86, disable VMX on all CPUs) for last VM destruction.
TDX requires its initialization on loading KVM module with VMX enabled on
all available CPUs. It needs to enable/disable hardware on module
initialization. To reuse the same logic, one way is to pass around the
unused opaque argument, another way is to remove the unused opaque
argument. This patch is a preparation for the latter by removing the
argument.
--
Isaku Yamahata <[email protected]>