Re: [PATCH kernel v5] KVM: PPC: Merge powerpc's debugfs entry content into generic entry
On Tue, 11 Jan 2022 11:54:04 +1100, Alexey Kardashevskiy wrote: > At the moment KVM on PPC creates 4 types of entries under the kvm debugfs: > 1) "%pid-%fd" per a KVM instance (for all platforms); > 2) "vm%pid" (for PPC Book3s HV KVM); > 3) "vm%u_vcpu%u_timing" (for PPC Book3e KVM); > 4) "kvm-xive-%p" (for XIVE PPC Book3s KVM, the same for XICS); > > The problem with this is that multiple VMs per process is not allowed for > 2) and 3) which makes it possible for userspace to trigger errors when > creating duplicated debugfs entries. > > [...] Applied to powerpc/topic/ppc-kvm. [1/1] KVM: PPC: Merge powerpc's debugfs entry content into generic entry https://git.kernel.org/powerpc/c/faf01aef0570757bfbf1d655e984742c1dd38068 cheers
Re: [PATCH kernel v5] KVM: PPC: Merge powerpc's debugfs entry content into generic entry
On 1/11/22 01:54, Alexey Kardashevskiy wrote:
At the moment KVM on PPC creates 4 types of entries under the kvm debugfs:
1) "%pid-%fd" per a KVM instance (for all platforms);
2) "vm%pid" (for PPC Book3s HV KVM);
3) "vm%u_vcpu%u_timing" (for PPC Book3e KVM);
4) "kvm-xive-%p" (for XIVE PPC Book3s KVM, the same for XICS);
The problem with this is that multiple VMs per process is not allowed for
2) and 3) which makes it possible for userspace to trigger errors when
creating duplicated debugfs entries.
This merges all these into 1).
This defines kvm_arch_create_kvm_debugfs() similar to
kvm_arch_create_vcpu_debugfs().
This defines 2 hooks in kvmppc_ops that allow specific KVM implementations
add necessary entries, this adds the _e500 suffix to
kvmppc_create_vcpu_debugfs_e500() to make it clear what platform it is for.
This makes use of already existing kvm_arch_create_vcpu_debugfs() on PPC.
This removes no more used debugfs_dir pointers from PPC kvm_arch structs.
This stops removing vcpu entries as once created vcpus stay around
for the entire life of a VM and removed when the KVM instance is closed,
see commit d56f5136b010 ("KVM: let kvm_destroy_vm_debugfs clean up vCPU
debugfs directories").
Suggested-by: Fabiano Rosas
Signed-off-by: Alexey Kardashevskiy
Reviewed-by: Cédric Le Goater
Thanks,
C.
---
Changes:
v5:
* fixed e500mc2
v4:
* added "kvm-xive-%p"
v3:
* reworked commit log, especially, the bit about removing vcpus
v2:
* handled powerpc-booke
* s/kvm/vm/ in arch hooks
---
arch/powerpc/include/asm/kvm_host.h| 6 ++---
arch/powerpc/include/asm/kvm_ppc.h | 2 ++
arch/powerpc/kvm/timing.h | 12 +-
arch/powerpc/kvm/book3s_64_mmu_hv.c| 2 +-
arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +-
arch/powerpc/kvm/book3s_hv.c | 31 ++
arch/powerpc/kvm/book3s_xics.c | 13 ++-
arch/powerpc/kvm/book3s_xive.c | 13 ++-
arch/powerpc/kvm/book3s_xive_native.c | 13 ++-
arch/powerpc/kvm/e500.c| 1 +
arch/powerpc/kvm/e500mc.c | 1 +
arch/powerpc/kvm/powerpc.c | 16 ++---
arch/powerpc/kvm/timing.c | 21 +
13 files changed, 51 insertions(+), 82 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h
b/arch/powerpc/include/asm/kvm_host.h
index 17263276189e..f5e14fa683f4 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -26,6 +26,8 @@
#include
#include
+#define __KVM_HAVE_ARCH_VCPU_DEBUGFS
+
#define KVM_MAX_VCPUS NR_CPUS
#define KVM_MAX_VCORESNR_CPUS
@@ -295,7 +297,6 @@ struct kvm_arch {
bool dawr1_enabled;
pgd_t *pgtable;
u64 process_table;
- struct dentry *debugfs_dir;
struct kvm_resize_hpt *resize_hpt; /* protected by kvm->lock */
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
@@ -673,7 +674,6 @@ struct kvm_vcpu_arch {
u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_last_exit;
- struct dentry *debugfs_exit_timing;
#endif
#ifdef CONFIG_PPC_BOOK3S
@@ -829,8 +829,6 @@ struct kvm_vcpu_arch {
struct kvmhv_tb_accumulator rm_exit;/* real-mode exit code */
struct kvmhv_tb_accumulator guest_time; /* guest execution */
struct kvmhv_tb_accumulator cede_time; /* time napping inside guest */
-
- struct dentry *debugfs_dir;
#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
};
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 33db83b82fbd..d2b192dea0d2 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -316,6 +316,8 @@ struct kvmppc_ops {
int (*svm_off)(struct kvm *kvm);
int (*enable_dawr1)(struct kvm *kvm);
bool (*hash_v3_possible)(void);
+ int (*create_vm_debugfs)(struct kvm *kvm);
+ int (*create_vcpu_debugfs)(struct kvm_vcpu *vcpu, struct dentry
*debugfs_dentry);
};
extern struct kvmppc_ops *kvmppc_hv_ops;
diff --git a/arch/powerpc/kvm/timing.h b/arch/powerpc/kvm/timing.h
index feef7885ba82..45817ab82bb4 100644
--- a/arch/powerpc/kvm/timing.h
+++ b/arch/powerpc/kvm/timing.h
@@ -14,8 +14,8 @@
#ifdef CONFIG_KVM_EXIT_TIMING
void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu);
void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu);
-void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id);
-void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu);
+int kvmppc_create_vcpu_debugfs_e500(struct kvm_vcpu *vcpu,
+ struct dentry *debugfs_dentry);
static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type)
{
@@ -26,9 +26,11 @@ static inline void kvmppc_set_exit_type(struct kvm_vcpu
*vcpu, int type)
/* if exit timing is
[PATCH kernel v5] KVM: PPC: Merge powerpc's debugfs entry content into generic entry
At the moment KVM on PPC creates 4 types of entries under the kvm debugfs:
1) "%pid-%fd" per a KVM instance (for all platforms);
2) "vm%pid" (for PPC Book3s HV KVM);
3) "vm%u_vcpu%u_timing" (for PPC Book3e KVM);
4) "kvm-xive-%p" (for XIVE PPC Book3s KVM, the same for XICS);
The problem with this is that multiple VMs per process is not allowed for
2) and 3) which makes it possible for userspace to trigger errors when
creating duplicated debugfs entries.
This merges all these into 1).
This defines kvm_arch_create_kvm_debugfs() similar to
kvm_arch_create_vcpu_debugfs().
This defines 2 hooks in kvmppc_ops that allow specific KVM implementations
add necessary entries, this adds the _e500 suffix to
kvmppc_create_vcpu_debugfs_e500() to make it clear what platform it is for.
This makes use of already existing kvm_arch_create_vcpu_debugfs() on PPC.
This removes no more used debugfs_dir pointers from PPC kvm_arch structs.
This stops removing vcpu entries as once created vcpus stay around
for the entire life of a VM and removed when the KVM instance is closed,
see commit d56f5136b010 ("KVM: let kvm_destroy_vm_debugfs clean up vCPU
debugfs directories").
Suggested-by: Fabiano Rosas
Signed-off-by: Alexey Kardashevskiy
---
Changes:
v5:
* fixed e500mc2
v4:
* added "kvm-xive-%p"
v3:
* reworked commit log, especially, the bit about removing vcpus
v2:
* handled powerpc-booke
* s/kvm/vm/ in arch hooks
---
arch/powerpc/include/asm/kvm_host.h| 6 ++---
arch/powerpc/include/asm/kvm_ppc.h | 2 ++
arch/powerpc/kvm/timing.h | 12 +-
arch/powerpc/kvm/book3s_64_mmu_hv.c| 2 +-
arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +-
arch/powerpc/kvm/book3s_hv.c | 31 ++
arch/powerpc/kvm/book3s_xics.c | 13 ++-
arch/powerpc/kvm/book3s_xive.c | 13 ++-
arch/powerpc/kvm/book3s_xive_native.c | 13 ++-
arch/powerpc/kvm/e500.c| 1 +
arch/powerpc/kvm/e500mc.c | 1 +
arch/powerpc/kvm/powerpc.c | 16 ++---
arch/powerpc/kvm/timing.c | 21 +
13 files changed, 51 insertions(+), 82 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h
b/arch/powerpc/include/asm/kvm_host.h
index 17263276189e..f5e14fa683f4 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -26,6 +26,8 @@
#include
#include
+#define __KVM_HAVE_ARCH_VCPU_DEBUGFS
+
#define KVM_MAX_VCPUS NR_CPUS
#define KVM_MAX_VCORES NR_CPUS
@@ -295,7 +297,6 @@ struct kvm_arch {
bool dawr1_enabled;
pgd_t *pgtable;
u64 process_table;
- struct dentry *debugfs_dir;
struct kvm_resize_hpt *resize_hpt; /* protected by kvm->lock */
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
@@ -673,7 +674,6 @@ struct kvm_vcpu_arch {
u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_last_exit;
- struct dentry *debugfs_exit_timing;
#endif
#ifdef CONFIG_PPC_BOOK3S
@@ -829,8 +829,6 @@ struct kvm_vcpu_arch {
struct kvmhv_tb_accumulator rm_exit;/* real-mode exit code */
struct kvmhv_tb_accumulator guest_time; /* guest execution */
struct kvmhv_tb_accumulator cede_time; /* time napping inside guest */
-
- struct dentry *debugfs_dir;
#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
};
diff --git a/arch/powerpc/include/asm/kvm_ppc.h
b/arch/powerpc/include/asm/kvm_ppc.h
index 33db83b82fbd..d2b192dea0d2 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -316,6 +316,8 @@ struct kvmppc_ops {
int (*svm_off)(struct kvm *kvm);
int (*enable_dawr1)(struct kvm *kvm);
bool (*hash_v3_possible)(void);
+ int (*create_vm_debugfs)(struct kvm *kvm);
+ int (*create_vcpu_debugfs)(struct kvm_vcpu *vcpu, struct dentry
*debugfs_dentry);
};
extern struct kvmppc_ops *kvmppc_hv_ops;
diff --git a/arch/powerpc/kvm/timing.h b/arch/powerpc/kvm/timing.h
index feef7885ba82..45817ab82bb4 100644
--- a/arch/powerpc/kvm/timing.h
+++ b/arch/powerpc/kvm/timing.h
@@ -14,8 +14,8 @@
#ifdef CONFIG_KVM_EXIT_TIMING
void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu);
void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu);
-void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id);
-void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu);
+int kvmppc_create_vcpu_debugfs_e500(struct kvm_vcpu *vcpu,
+ struct dentry *debugfs_dentry);
static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type)
{
@@ -26,9 +26,11 @@ static inline void kvmppc_set_exit_type(struct kvm_vcpu
*vcpu, int type)
/* if exit timing is not configured there is no need to build the c file */
static inline void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) {}
static inline void
