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[PATCH kernel 9/9] KVM: PPC: Add support for multiple-TCE hcalls

[Alexey Kardashevskiy]

This adds real and virtual mode handlers for the H_PUT_TCE_INDIRECT and
H_STUFF_TCE hypercalls for user space emulated devices such as IBMVIO
devices or emulated PCI.  These calls allow adding multiple entries
(up to 512) into the TCE table in one call which saves time on
transition between kernel and user space.

This implements the KVM_CAP_PPC_MULTITCE capability. When present,
the kernel will try handling H_PUT_TCE_INDIRECT and H_STUFF_TCE.
If they can not be handled by the kernel, they are passed on to
the user space. The user space still has to have an implementation
for these.

Both HV and PR-syle KVM are supported.

Signed-off-by: Alexey Kardashevskiy 
---
 Documentation/virtual/kvm/api.txt   |  25 ++
 arch/powerpc/include/asm/kvm_ppc.h  |  12 +++
 arch/powerpc/kvm/book3s_64_vio.c| 111 +++-
 arch/powerpc/kvm/book3s_64_vio_hv.c | 145 ++--
 arch/powerpc/kvm/book3s_hv.c|  26 +-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |   6 +-
 arch/powerpc/kvm/book3s_pr_papr.c   |  35 
 arch/powerpc/kvm/powerpc.c  |   3 +
 8 files changed, 350 insertions(+), 13 deletions(-)

diff --git a/Documentation/virtual/kvm/api.txt 
b/Documentation/virtual/kvm/api.txt
index d86d831..593c62a 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3019,6 +3019,31 @@ Returns: 0 on success, -1 on error
 
 Queues an SMI on the thread's vcpu.
 
+4.97 KVM_CAP_PPC_MULTITCE
+
+Capability: KVM_CAP_PPC_MULTITCE
+Architectures: ppc
+Type: vm
+
+This capability means the kernel is capable of handling hypercalls
+H_PUT_TCE_INDIRECT and H_STUFF_TCE without passing those into the user
+space. This significantly accelerates DMA operations for PPC KVM guests.
+User space should expect that its handlers for these hypercalls
+are not going to be called if user space previously registered LIOBN
+in KVM (via KVM_CREATE_SPAPR_TCE or similar calls).
+
+In order to enable H_PUT_TCE_INDIRECT and H_STUFF_TCE use in the guest,
+user space might have to advertise it for the guest. For example,
+IBM pSeries (sPAPR) guest starts using them if "hcall-multi-tce" is
+present in the "ibm,hypertas-functions" device-tree property.
+
+The hypercalls mentioned above may or may not be processed successfully
+in the kernel based fast path. If they can not be handled by the kernel,
+they will get passed on to user space. So user space still has to have
+an implementation for these despite the in kernel acceleration.
+
+This capability is always enabled.
+
 5. The kvm_run structure
 
 
diff --git a/arch/powerpc/include/asm/kvm_ppc.h 
b/arch/powerpc/include/asm/kvm_ppc.h
index fcde896..e5b968e 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -166,12 +166,24 @@ extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
 
 extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce *args);
+extern struct kvmppc_spapr_tce_table *kvmppc_find_table(
+   struct kvm_vcpu *vcpu, unsigned long liobn);
 extern long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,
unsigned long ioba, unsigned long npages);
 extern long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *tt,
unsigned long tce);
+extern long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
+   unsigned long *ua, unsigned long **prmap);
+extern void kvmppc_tce_put(struct kvmppc_spapr_tce_table *tt,
+   unsigned long idx, unsigned long tce);
 extern long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
 unsigned long ioba, unsigned long tce);
+extern long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
+   unsigned long liobn, unsigned long ioba,
+   unsigned long tce_list, unsigned long npages);
+extern long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
+   unsigned long liobn, unsigned long ioba,
+   unsigned long tce_value, unsigned long npages);
 extern long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
 unsigned long ioba);
 extern struct page *kvm_alloc_hpt(unsigned long nr_pages);
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index e347856..d3fc732 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -14,6 +14,7 @@
  *
  * Copyright 2010 Paul Mackerras, IBM Corp. 
  * Copyright 2011 David Gibson, IBM Corporation 
+ * Copyright 2013 Alexey Kardashevskiy, IBM Corporation 
  */
 
 #include 
@@ -37,8 +38,7 @@
 #include 
 #include 
 #include 
-
-#define TCES_PER_PAGE  (PAGE_SIZE / sizeof(u64))
+#include 
 
 static long kvmppc_stt_npages(unsigned long window_size)
 {
@@ -200,3 +200,110 @@ fail:
}

[PATCH kernel 4/9] KVM: PPC: Use RCU for arch.spapr_tce_tables

[Alexey Kardashevskiy]

At the moment spapr_tce_tables is not protected against races. This makes
use of RCU-variants of list helpers. As some bits are executed in real
mode, this makes use of just introduced list_for_each_entry_rcu_notrace().

This converts release_spapr_tce_table() to a RCU scheduled handler.

Signed-off-by: Alexey Kardashevskiy 
---
 arch/powerpc/include/asm/kvm_host.h |  1 +
 arch/powerpc/kvm/book3s.c   |  2 +-
 arch/powerpc/kvm/book3s_64_vio.c| 20 +++-
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h 
b/arch/powerpc/include/asm/kvm_host.h
index 98eebbf6..e19d412 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -178,6 +178,7 @@ struct kvmppc_spapr_tce_table {
struct kvm *kvm;
u64 liobn;
u32 window_size;
+   struct rcu_head rcu;
struct page *pages[0];
 };
 
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 53285d5..3418f7c 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -806,7 +806,7 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 {
 
 #ifdef CONFIG_PPC64
-   INIT_LIST_HEAD(>arch.spapr_tce_tables);
+   INIT_LIST_HEAD_RCU(>arch.spapr_tce_tables);
INIT_LIST_HEAD(>arch.rtas_tokens);
 #endif
 
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index 54cf9bc..9526c34 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -45,19 +45,16 @@ static long kvmppc_stt_npages(unsigned long window_size)
 * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 }
 
-static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
+static void release_spapr_tce_table(struct rcu_head *head)
 {
-   struct kvm *kvm = stt->kvm;
+   struct kvmppc_spapr_tce_table *stt = container_of(head,
+   struct kvmppc_spapr_tce_table, rcu);
int i;
 
-   mutex_lock(>lock);
-   list_del(>list);
for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
__free_page(stt->pages[i]);
+
kfree(stt);
-   mutex_unlock(>lock);
-
-   kvm_put_kvm(kvm);
 }
 
 static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault 
*vmf)
@@ -88,7 +85,12 @@ static int kvm_spapr_tce_release(struct inode *inode, struct 
file *filp)
 {
struct kvmppc_spapr_tce_table *stt = filp->private_data;
 
-   release_spapr_tce_table(stt);
+   list_del_rcu(>list);
+
+   kvm_put_kvm(stt->kvm);
+
+   call_rcu(>rcu, release_spapr_tce_table);
+
return 0;
 }
 
@@ -131,7 +133,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
kvm_get_kvm(kvm);
 
mutex_lock(>lock);
-   list_add(>list, >arch.spapr_tce_tables);
+   list_add_rcu(>list, >arch.spapr_tce_tables);
 
mutex_unlock(>lock);
 
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 5/9] KVM: PPC: Account TCE-containing pages in locked_vm

[Alexey Kardashevskiy]

At the moment pages used for TCE tables (in addition to pages addressed
by TCEs) are not counted in locked_vm counter so a malicious userspace
tool can call ioctl(KVM_CREATE_SPAPR_TCE) as many times as RLIMIT_NOFILE and
lock a lot of memory.

This adds counting for pages used for TCE tables.

This counts the number of pages required for a table plus pages for
the kvmppc_spapr_tce_table struct (TCE table descriptor) itself.

This does not change the amount of (de)allocated memory.

Signed-off-by: Alexey Kardashevskiy 
---
 arch/powerpc/kvm/book3s_64_vio.c | 51 +++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index 9526c34..b70787d 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -45,13 +45,56 @@ static long kvmppc_stt_npages(unsigned long window_size)
 * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 }
 
+static long kvmppc_account_memlimit(long npages, bool inc)
+{
+   long ret = 0;
+   const long bytes = sizeof(struct kvmppc_spapr_tce_table) +
+   (abs(npages) * sizeof(struct page *));
+   const long stt_pages = ALIGN(bytes, PAGE_SIZE) / PAGE_SIZE;
+
+   if (!current || !current->mm)
+   return ret; /* process exited */
+
+   npages += stt_pages;
+
+   down_write(>mm->mmap_sem);
+
+   if (inc) {
+   long locked, lock_limit;
+
+   locked = current->mm->locked_vm + npages;
+   lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+   if (locked > lock_limit && !capable(CAP_IPC_LOCK))
+   ret = -ENOMEM;
+   else
+   current->mm->locked_vm += npages;
+   } else {
+   if (npages > current->mm->locked_vm)
+   npages = current->mm->locked_vm;
+
+   current->mm->locked_vm -= npages;
+   }
+
+   pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid,
+   inc ? '+' : '-',
+   npages << PAGE_SHIFT,
+   current->mm->locked_vm << PAGE_SHIFT,
+   rlimit(RLIMIT_MEMLOCK),
+   ret ? " - exceeded" : "");
+
+   up_write(>mm->mmap_sem);
+
+   return ret;
+}
+
 static void release_spapr_tce_table(struct rcu_head *head)
 {
struct kvmppc_spapr_tce_table *stt = container_of(head,
struct kvmppc_spapr_tce_table, rcu);
int i;
+   long npages = kvmppc_stt_npages(stt->window_size);
 
-   for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
+   for (i = 0; i < npages; i++)
__free_page(stt->pages[i]);
 
kfree(stt);
@@ -89,6 +132,7 @@ static int kvm_spapr_tce_release(struct inode *inode, struct 
file *filp)
 
kvm_put_kvm(stt->kvm);
 
+   kvmppc_account_memlimit(kvmppc_stt_npages(stt->window_size), false);
call_rcu(>rcu, release_spapr_tce_table);
 
return 0;
@@ -114,6 +158,11 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
}
 
npages = kvmppc_stt_npages(args->window_size);
+   ret = kvmppc_account_memlimit(npages, true);
+   if (ret) {
+   stt = NULL;
+   goto fail;
+   }
 
stt = kzalloc(sizeof(*stt) + npages * sizeof(struct page *),
  GFP_KERNEL);
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 6/9] KVM: PPC: Replace SPAPR_TCE_SHIFT with IOMMU_PAGE_SHIFT_4K

[Alexey Kardashevskiy]

SPAPR_TCE_SHIFT is used in few places only and since IOMMU_PAGE_SHIFT_4K
can be easily used instead, remove SPAPR_TCE_SHIFT.

Signed-off-by: Alexey Kardashevskiy 
---
 arch/powerpc/include/asm/kvm_book3s_64.h | 2 --
 arch/powerpc/kvm/book3s_64_vio.c | 3 ++-
 arch/powerpc/kvm/book3s_64_vio_hv.c  | 4 ++--
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h 
b/arch/powerpc/include/asm/kvm_book3s_64.h
index 2aa79c8..7529aab 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -33,8 +33,6 @@ static inline void svcpu_put(struct kvmppc_book3s_shadow_vcpu 
*svcpu)
 }
 #endif
 
-#define SPAPR_TCE_SHIFT12
-
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 #define KVM_DEFAULT_HPT_ORDER  24  /* 16MB HPT by default */
 #endif
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index b70787d..e347856 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -36,12 +36,13 @@
 #include 
 #include 
 #include 
+#include 
 
 #define TCES_PER_PAGE  (PAGE_SIZE / sizeof(u64))
 
 static long kvmppc_stt_npages(unsigned long window_size)
 {
-   return ALIGN((window_size >> SPAPR_TCE_SHIFT)
+   return ALIGN((window_size >> IOMMU_PAGE_SHIFT_4K)
 * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
 }
 
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c 
b/arch/powerpc/kvm/book3s_64_vio_hv.c
index 8ae12ac..6cf1ab3 100644
--- a/arch/powerpc/kvm/book3s_64_vio_hv.c
+++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
@@ -99,7 +99,7 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long 
liobn,
if (ret)
return ret;
 
-   idx = ioba >> SPAPR_TCE_SHIFT;
+   idx = ioba >> IOMMU_PAGE_SHIFT_4K;
page = stt->pages[idx / TCES_PER_PAGE];
tbl = (u64 *)page_address(page);
 
@@ -121,7 +121,7 @@ long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long 
liobn,
if (stt) {
ret = kvmppc_ioba_validate(stt, ioba, 1);
if (!ret) {
-   unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
+   unsigned long idx = ioba >> IOMMU_PAGE_SHIFT_4K;
struct page *page = stt->pages[idx / TCES_PER_PAGE];
u64 *tbl = (u64 *)page_address(page);
 
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 8/9] KVM: Fix KVM_SMI chapter number

[Alexey Kardashevskiy]

The KVM_SMI capability is following the KVM_S390_SET_IRQ_STATE capability
which is "4.95", this changes the number of the KVM_SMI chapter to 4.96.

Signed-off-by: Alexey Kardashevskiy 
---
 Documentation/virtual/kvm/api.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/virtual/kvm/api.txt 
b/Documentation/virtual/kvm/api.txt
index d9eccee..d86d831 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3009,7 +3009,7 @@ len must be a multiple of sizeof(struct kvm_s390_irq). It 
must be > 0
 and it must not exceed (max_vcpus + 32) * sizeof(struct kvm_s390_irq),
 which is the maximum number of possibly pending cpu-local interrupts.
 
-4.90 KVM_SMI
+4.96 KVM_SMI
 
 Capability: KVM_CAP_X86_SMM
 Architectures: x86
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 0/9] KVM: PPC: Add in-kernel multitce handling

[Alexey Kardashevskiy]

These patches enable in-kernel acceleration for H_PUT_TCE_INDIRECT and
H_STUFF_TCE hypercalls which allow doing multiple (up to 512) TCE entries
update in a single call saving time on switching context. QEMU already
supports these hypercalls so this is just an optimization.

Both HV and PR KVM modes are supported.

This does not affect VFIO, this support is coming next.

Please comment. Thanks.


Alexey Kardashevskiy (9):
  rcu: Define notrace version of list_for_each_entry_rcu
  KVM: PPC: Make real_vmalloc_addr() public
  KVM: PPC: Rework H_PUT_TCE/H_GET_TCE handlers
  KVM: PPC: Use RCU for arch.spapr_tce_tables
  KVM: PPC: Account TCE-containing pages in locked_vm
  KVM: PPC: Replace SPAPR_TCE_SHIFT with IOMMU_PAGE_SHIFT_4K
  KVM: PPC: Move reusable bits of H_PUT_TCE handler to helpers
  KVM: Fix KVM_SMI chapter number
  KVM: PPC: Add support for multiple-TCE hcalls

 Documentation/virtual/kvm/api.txt|  27 ++-
 arch/powerpc/include/asm/kvm_book3s_64.h |   2 -
 arch/powerpc/include/asm/kvm_host.h  |   1 +
 arch/powerpc/include/asm/kvm_ppc.h   |  16 ++
 arch/powerpc/include/asm/mmu-hash64.h|   3 +
 arch/powerpc/kvm/book3s.c|   2 +-
 arch/powerpc/kvm/book3s_64_vio.c | 185 --
 arch/powerpc/kvm/book3s_64_vio_hv.c  | 310 +++
 arch/powerpc/kvm/book3s_hv.c |  26 ++-
 arch/powerpc/kvm/book3s_hv_rm_mmu.c  |  17 --
 arch/powerpc/kvm/book3s_hv_rmhandlers.S  |   6 +-
 arch/powerpc/kvm/book3s_pr_papr.c|  35 
 arch/powerpc/kvm/powerpc.c   |   3 +
 arch/powerpc/mm/hash_utils_64.c  |  17 ++
 include/linux/rculist.h  |  38 
 15 files changed, 610 insertions(+), 78 deletions(-)

-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 2/9] KVM: PPC: Make real_vmalloc_addr() public

[Alexey Kardashevskiy]

This helper translates vmalloc'd addresses to linear addresses.
It is only used by the KVM MMU code now and resides in the HV KVM code.
We will need it further in the TCE code and the DMA memory preregistration
code called in real mode.

This makes real_vmalloc_addr() public and moves it to the powerpc code as
it does not do anything special for KVM.

Signed-off-by: Alexey Kardashevskiy 
---
 arch/powerpc/include/asm/mmu-hash64.h |  3 +++
 arch/powerpc/kvm/book3s_hv_rm_mmu.c   | 17 -
 arch/powerpc/mm/hash_utils_64.c   | 17 +
 3 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/include/asm/mmu-hash64.h 
b/arch/powerpc/include/asm/mmu-hash64.h
index a82f534..fd06b73 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -606,6 +606,9 @@ static inline unsigned long get_kernel_vsid(unsigned long 
ea, int ssize)
context = (MAX_USER_CONTEXT) + ((ea >> 60) - 0xc) + 1;
return get_vsid(context, ea, ssize);
 }
+
+void *real_vmalloc_addr(void *x);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_MMU_HASH64_H_ */
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c 
b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index c1df9bb..987b7d1 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -22,23 +22,6 @@
 #include 
 #include 
 
-/* Translate address of a vmalloc'd thing to a linear map address */
-static void *real_vmalloc_addr(void *x)
-{
-   unsigned long addr = (unsigned long) x;
-   pte_t *p;
-   /*
-* assume we don't have huge pages in vmalloc space...
-* So don't worry about THP collapse/split. Called
-* Only in realmode, hence won't need irq_save/restore.
-*/
-   p = __find_linux_pte_or_hugepte(swapper_pg_dir, addr, NULL);
-   if (!p || !pte_present(*p))
-   return NULL;
-   addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
-   return __va(addr);
-}
-
 /* Return 1 if we need to do a global tlbie, 0 if we can use tlbiel */
 static int global_invalidates(struct kvm *kvm, unsigned long flags)
 {
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 5ec987f..9737d6a 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1556,3 +1556,20 @@ void setup_initial_memory_limit(phys_addr_t 
first_memblock_base,
/* Finally limit subsequent allocations */
memblock_set_current_limit(ppc64_rma_size);
 }
+
+/* Translate address of a vmalloc'd thing to a linear map address */
+void *real_vmalloc_addr(void *x)
+{
+   unsigned long addr = (unsigned long) x;
+   pte_t *p;
+   /*
+* assume we don't have huge pages in vmalloc space...
+* So don't worry about THP collapse/split. Called
+* Only in realmode, hence won't need irq_save/restore.
+*/
+   p = __find_linux_pte_or_hugepte(swapper_pg_dir, addr, NULL);
+   if (!p || !pte_present(*p))
+   return NULL;
+   addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
+   return __va(addr);
+}
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 1/9] rcu: Define notrace version of list_for_each_entry_rcu

[Alexey Kardashevskiy]

This defines list_for_each_entry_rcu_notrace and list_entry_rcu_notrace
which use rcu_dereference_raw_notrace instead of rcu_dereference_raw.
This allows using list_for_each_entry_rcu_notrace in real mode (MMU is off).

Signed-off-by: Alexey Kardashevskiy 
---
 include/linux/rculist.h | 38 ++
 1 file changed, 38 insertions(+)

diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 17c6b1f..439c4d7 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -253,6 +253,25 @@ static inline void list_splice_init_rcu(struct list_head 
*list,
 })
 
 /**
+ * list_entry_rcu_notrace - get the struct for this entry
+ * @ptr:the  list_head pointer.
+ * @type:   the type of the struct this is embedded in.
+ * @member: the name of the list_struct within the struct.
+ *
+ * This primitive may safely run concurrently with the _rcu list-mutation
+ * primitives such as list_add_rcu() as long as it's guarded by 
rcu_read_lock().
+ *
+ * This is the same as list_entry_rcu() except that it does
+ * not do any RCU debugging or tracing.
+ */
+#define list_entry_rcu_notrace(ptr, type, member) \
+({ \
+   typeof(*ptr) __rcu *__ptr = (typeof(*ptr) __rcu __force *)ptr; \
+   container_of((typeof(ptr))rcu_dereference_raw_notrace(__ptr), \
+   type, member); \
+})
+
+/**
  * Where are list_empty_rcu() and list_first_entry_rcu()?
  *
  * Implementing those functions following their counterparts list_empty() and
@@ -308,6 +327,25 @@ static inline void list_splice_init_rcu(struct list_head 
*list,
pos = list_entry_rcu(pos->member.next, typeof(*pos), member))
 
 /**
+ * list_for_each_entry_rcu_notrace - iterate over rcu list of given type
+ * @pos:   the type * to use as a loop cursor.
+ * @head:  the head for your list.
+ * @member:the name of the list_struct within the struct.
+ *
+ * This list-traversal primitive may safely run concurrently with
+ * the _rcu list-mutation primitives such as list_add_rcu()
+ * as long as the traversal is guarded by rcu_read_lock().
+ *
+ * This is the same as list_for_each_entry_rcu() except that it does
+ * not do any RCU debugging or tracing.
+ */
+#define list_for_each_entry_rcu_notrace(pos, head, member) \
+   for (pos = list_entry_rcu_notrace((head)->next, typeof(*pos), member); \
+   >member != (head); \
+   pos = list_entry_rcu_notrace(pos->member.next, typeof(*pos), \
+   member))
+
+/**
  * list_for_each_entry_continue_rcu - continue iteration over list of given 
type
  * @pos:   the type * to use as a loop cursor.
  * @head:  the head for your list.
-- 
2.4.0.rc3.8.gfb3e7d5

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[PATCH kernel 3/9] KVM: PPC: Rework H_PUT_TCE/H_GET_TCE handlers

[Alexey Kardashevskiy]

This reworks the existing H_PUT_TCE/H_GET_TCE handlers to have one
exit path. This allows next patch to add locks nicely.

This moves the ioba boundaries check to a helper and adds a check for
least bits which have to be zeros.

The patch is pretty mechanical (only check for least ioba bits is added)
so no change in behaviour is expected.

Signed-off-by: Alexey Kardashevskiy 
---
 arch/powerpc/kvm/book3s_64_vio_hv.c | 102 +++-
 1 file changed, 66 insertions(+), 36 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c 
b/arch/powerpc/kvm/book3s_64_vio_hv.c
index 89e96b3..8ae12ac 100644
--- a/arch/powerpc/kvm/book3s_64_vio_hv.c
+++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
@@ -35,71 +35,101 @@
 #include 
 #include 
 #include 
+#include 
 
 #define TCES_PER_PAGE  (PAGE_SIZE / sizeof(u64))
 
+/*
+ * Finds a TCE table descriptor by LIOBN.
+ *
+ * WARNING: This will be called in real or virtual mode on HV KVM and virtual
+ *  mode on PR KVM
+ */
+static struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm_vcpu *vcpu,
+   unsigned long liobn)
+{
+   struct kvm *kvm = vcpu->kvm;
+   struct kvmppc_spapr_tce_table *stt;
+
+   list_for_each_entry_rcu_notrace(stt, >arch.spapr_tce_tables, list)
+   if (stt->liobn == liobn)
+   return stt;
+
+   return NULL;
+}
+
+/*
+ * Validates IO address.
+ *
+ * WARNING: This will be called in real-mode on HV KVM and virtual
+ *  mode on PR KVM
+ */
+static long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,
+   unsigned long ioba, unsigned long npages)
+{
+   unsigned long mask = (1ULL << IOMMU_PAGE_SHIFT_4K) - 1;
+   unsigned long idx = ioba >> IOMMU_PAGE_SHIFT_4K;
+   unsigned long size = stt->window_size >> IOMMU_PAGE_SHIFT_4K;
+
+   if ((ioba & mask) || (size + npages <= idx))
+   return H_PARAMETER;
+
+   return H_SUCCESS;
+}
+
 /* WARNING: This will be called in real-mode on HV KVM and virtual
  *  mode on PR KVM
  */
 long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
  unsigned long ioba, unsigned long tce)
 {
-   struct kvm *kvm = vcpu->kvm;
-   struct kvmppc_spapr_tce_table *stt;
+   struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
+   long ret = H_TOO_HARD;
+   unsigned long idx;
+   struct page *page;
+   u64 *tbl;
 
/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
/*  liobn, ioba, tce); */
 
-   list_for_each_entry(stt, >arch.spapr_tce_tables, list) {
-   if (stt->liobn == liobn) {
-   unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
-   struct page *page;
-   u64 *tbl;
+   if (!stt)
+   return ret;
 
-   /* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p  
window_size=0x%x\n", */
-   /*  liobn, stt, stt->window_size); */
-   if (ioba >= stt->window_size)
-   return H_PARAMETER;
+   ret = kvmppc_ioba_validate(stt, ioba, 1);
+   if (ret)
+   return ret;
 
-   page = stt->pages[idx / TCES_PER_PAGE];
-   tbl = (u64 *)page_address(page);
+   idx = ioba >> SPAPR_TCE_SHIFT;
+   page = stt->pages[idx / TCES_PER_PAGE];
+   tbl = (u64 *)page_address(page);
 
-   /* FIXME: Need to validate the TCE itself */
-   /* udbg_printf("tce @ %p\n", [idx % 
TCES_PER_PAGE]); */
-   tbl[idx % TCES_PER_PAGE] = tce;
-   return H_SUCCESS;
-   }
-   }
+   /* FIXME: Need to validate the TCE itself */
+   /* udbg_printf("tce @ %p\n", [idx % TCES_PER_PAGE]); */
+   tbl[idx % TCES_PER_PAGE] = tce;
 
-   /* Didn't find the liobn, punt it to userspace */
-   return H_TOO_HARD;
+   return ret;
 }
 EXPORT_SYMBOL_GPL(kvmppc_h_put_tce);
 
 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
  unsigned long ioba)
 {
-   struct kvm *kvm = vcpu->kvm;
-   struct kvmppc_spapr_tce_table *stt;
+   struct kvmppc_spapr_tce_table *stt = kvmppc_find_table(vcpu, liobn);
+   long ret = H_TOO_HARD;
 
-   list_for_each_entry(stt, >arch.spapr_tce_tables, list) {
-   if (stt->liobn == liobn) {
+
+   if (stt) {
+   ret = kvmppc_ioba_validate(stt, ioba, 1);
+   if (!ret) {
unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
-   struct page *page;
-   u64 *tbl;
-
-   if (ioba >= stt->window_size)
-   return H_PARAMETER;
-
-   page = stt->pages[idx / TCES_PER_PAGE];
-   tbl = (u64 *)page_address(page);

Re: [PATCH v3] ppc/spapr: Implement H_RANDOM hypercall in QEMU

[Amit Shah]

On (Tue) 15 Sep 2015 [14:26:06], David Gibson wrote:
> On Mon, Sep 14, 2015 at 08:32:36AM +0200, Thomas Huth wrote:
> > On 14/09/15 04:15, David Gibson wrote:
> > > On Fri, Sep 11, 2015 at 11:17:01AM +0200, Thomas Huth wrote:
> > >> The PAPR interface defines a hypercall to pass high-quality
> > >> hardware generated random numbers to guests. Recent kernels can
> > >> already provide this hypercall to the guest if the right hardware
> > >> random number generator is available. But in case the user wants
> > >> to use another source like EGD, or QEMU is running with an older
> > >> kernel, we should also have this call in QEMU, so that guests that
> > >> do not support virtio-rng yet can get good random numbers, too.
> > >>
> > >> This patch now adds a new pseude-device to QEMU that either
> > >> directly provides this hypercall to the guest or is able to
> > >> enable the in-kernel hypercall if available. The in-kernel
> > >> hypercall can be enabled with the use-kvm property, e.g.:
> > >>
> > >>  qemu-system-ppc64 -device spapr-rng,use-kvm=true
> > >>
> > >> For handling the hypercall in QEMU instead, a RngBackend is required
> > >> since the hypercall should provide "good" random data instead of
> > >> pseudo-random (like from a "simple" library function like rand()
> > >> or g_random_int()). Since there are multiple RngBackends available,
> > >> the user must select an appropriate backend via the "backend"
> > >> property of the device, e.g.:
> > >>
> > >>  qemu-system-ppc64 -object rng-random,filename=/dev/hwrng,id=rng0 \
> > >>-device spapr-rng,backend=rng0 ...

(snip)

> > > More importantly, this should probably be called "rng" not "backend"
> > > to match virtio-rng.
> > 
> > Since the device is already called "spapr-rng", i.e. has "rng" in its
> > name, I'd rather like to keep this as "backend" to make it clear that
> > you specify the backend this way.
> 
> Hm, personally I'd weigh consistency with virtio-rng higher than the
> slightly confusing name.

Agreed.

Amit
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