From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH 10/16] powerpc/kvm/hash: Implement HASH_REMOVE hcall
Date: Fri, 27 Oct 2017 09:38:27 +0530 [thread overview]
Message-ID: <20171027040833.3644-11-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <20171027040833.3644-1-aneesh.kumar@linux.vnet.ibm.com>
This is equivalent to H_REMOVE hcall, but then takes hash value as the arg
instead of hashpte slot number. We will use this later to speed up invalidate
operation in guest. Instead of finding slot number using H_READ4 hcall, we can
use hash value directly using this hcall.
Only support flag value for the operation is H_AVPN.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/hvcall.h | 3 +-
arch/powerpc/include/asm/plpar_wrappers.h | 16 ++++
arch/powerpc/kvm/book3s_hv.c | 1 +
arch/powerpc/kvm/book3s_hv_rm_mmu.c | 134 ++++++++++++++++++++++++++----
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 +
5 files changed, 138 insertions(+), 18 deletions(-)
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 3d34dc0869f6..92980217a076 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -291,7 +291,8 @@
#define H_INT_ESB 0x3C8
#define H_INT_SYNC 0x3CC
#define H_INT_RESET 0x3D0
-#define MAX_HCALL_OPCODE H_INT_RESET
+#define H_HASH_REMOVE 0x3D4
+#define MAX_HCALL_OPCODE H_HASH_REMOVE
/* H_VIOCTL functions */
#define H_GET_VIOA_DUMP_SIZE 0x01
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h b/arch/powerpc/include/asm/plpar_wrappers.h
index c7b164836bc3..8160fea9b5bc 100644
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -124,6 +124,22 @@ static inline long plpar_pte_remove(unsigned long flags, unsigned long ptex,
return rc;
}
+static inline long plpar_pte_hash_remove(unsigned long flags, unsigned long hash,
+ unsigned long avpn, unsigned long *old_pteh_ret,
+ unsigned long *old_ptel_ret)
+{
+ long rc;
+ unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+ rc = plpar_hcall(H_HASH_REMOVE, retbuf, flags, hash, avpn);
+
+ *old_pteh_ret = retbuf[0];
+ *old_ptel_ret = retbuf[1];
+
+ return rc;
+}
+
+
/* plpar_pte_remove_raw can be called in real mode. It calls plpar_hcall_raw */
static inline long plpar_pte_remove_raw(unsigned long flags, unsigned long ptex,
unsigned long avpn, unsigned long *old_pteh_ret,
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 73bf1ebfa78f..56e7f52ed324 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4171,6 +4171,7 @@ static unsigned int default_hcall_list[] = {
H_XIRR,
H_XIRR_X,
#endif
+ H_HASH_REMOVE,
0
};
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
index d80240ba6de4..7ebeb1be8380 100644
--- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
+++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
@@ -465,34 +465,21 @@ static void do_tlbies(struct kvm *kvm, unsigned long *rbvalues,
}
}
-long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
- unsigned long pte_index, unsigned long avpn,
- unsigned long *hpret)
+static long __kvmppc_do_hash_remove(struct kvm *kvm, __be64 *hpte,
+ unsigned long pte_index,
+ unsigned long *hpret)
{
- __be64 *hpte;
+
unsigned long v, r, rb;
struct revmap_entry *rev;
u64 pte, orig_pte, pte_r;
- if (kvm_is_radix(kvm))
- return H_FUNCTION;
- if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
- return H_PARAMETER;
- hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
- while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
- cpu_relax();
pte = orig_pte = be64_to_cpu(hpte[0]);
pte_r = be64_to_cpu(hpte[1]);
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
pte = hpte_new_to_old_v(pte, pte_r);
pte_r = hpte_new_to_old_r(pte_r);
}
- if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
- ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) ||
- ((flags & H_ANDCOND) && (pte & avpn) != 0)) {
- __unlock_hpte(hpte, orig_pte);
- return H_NOT_FOUND;
- }
rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
v = pte & ~HPTE_V_HVLOCK;
@@ -525,6 +512,35 @@ long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
hpret[1] = r;
return H_SUCCESS;
}
+
+long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
+ unsigned long pte_index, unsigned long avpn,
+ unsigned long *hpret)
+{
+ __be64 *hpte;
+ u64 pte, orig_pte, pte_r;
+
+ if (kvm_is_radix(kvm))
+ return H_FUNCTION;
+ if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
+ return H_PARAMETER;
+ hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
+ while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
+ cpu_relax();
+ pte = orig_pte = be64_to_cpu(hpte[0]);
+ pte_r = be64_to_cpu(hpte[1]);
+ if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+ pte = hpte_new_to_old_v(pte, pte_r);
+ pte_r = hpte_new_to_old_r(pte_r);
+ }
+ if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
+ ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) ||
+ ((flags & H_ANDCOND) && (pte & avpn) != 0)) {
+ __unlock_hpte(hpte, orig_pte);
+ return H_NOT_FOUND;
+ }
+ return __kvmppc_do_hash_remove(kvm, hpte, pte_index, hpret);
+}
EXPORT_SYMBOL_GPL(kvmppc_do_h_remove);
long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
@@ -534,6 +550,90 @@ long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
&vcpu->arch.gpr[4]);
}
+/* return locked hpte */
+static __be64 *kvmppc_find_hpte_slot(struct kvm *kvm, unsigned long hash,
+ unsigned long avpn, unsigned long *pte_index)
+{
+ int i;
+ __be64 *hpte;
+ unsigned long slot;
+ u64 pte_v, orig_pte, pte_r;
+ bool secondary_search = false;
+
+ /*
+ * search for the hpte in primary group
+ */
+ slot = (hash & kvmppc_hpt_mask(&kvm->arch.hpt)) * HPTES_PER_GROUP;
+
+search_again:
+ hpte = (__be64 *)(kvm->arch.hpt.virt + (slot << 4));
+ for (i = 0; i < HPTES_PER_GROUP; i++ , hpte += 2) {
+ /* lockless search */
+ pte_v = orig_pte = be64_to_cpu(hpte[0]);
+ pte_r = be64_to_cpu(hpte[1]);
+ if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+ pte_v = hpte_new_to_old_v(pte_v, pte_r);
+ pte_r = hpte_new_to_old_r(pte_r);
+ }
+ if ((pte_v & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0)
+ continue;
+
+ if ((pte_v & ~0x7FUL) == avpn) {
+ while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
+ cpu_relax();
+ pte_v = orig_pte = be64_to_cpu(hpte[0]);
+ pte_r = be64_to_cpu(hpte[1]);
+ if (cpu_has_feature(CPU_FTR_ARCH_300)) {
+ pte_v = hpte_new_to_old_v(pte_v, pte_r);
+ pte_r = hpte_new_to_old_r(pte_r);
+ }
+ if ((pte_v & ~0x7FUL) != avpn) {
+ /* unlock and continue */
+ __unlock_hpte(hpte, orig_pte);
+ continue;
+ }
+ *pte_index = slot + i;
+ return hpte;
+ }
+ }
+ if (!secondary_search) {
+ secondary_search = true;
+ slot = (~hash & kvmppc_hpt_mask(&kvm->arch.hpt)) * HPTES_PER_GROUP;
+ goto search_again;
+ }
+ return NULL;
+}
+
+/* Only support H_AVPN flag, which is must */
+long kvmppc_do_h_hash_remove(struct kvm *kvm, unsigned long flags,
+ unsigned long hash, unsigned long avpn,
+ unsigned long *hpret)
+{
+ __be64 *hpte;
+ unsigned long pte_index;
+
+
+ if (kvm_is_radix(kvm))
+ return H_FUNCTION;
+
+ if ((flags & H_AVPN) != H_AVPN)
+ return H_PARAMETER;
+
+ hpte = kvmppc_find_hpte_slot(kvm, hash, avpn, &pte_index);
+ if (!hpte)
+ return H_NOT_FOUND;
+
+ return __kvmppc_do_hash_remove(kvm, hpte, pte_index, hpret);
+}
+EXPORT_SYMBOL_GPL(kvmppc_do_h_hash_remove);
+
+long kvmppc_h_hash_remove(struct kvm_vcpu *vcpu, unsigned long flags,
+ unsigned long hash, unsigned long avpn)
+{
+ return kvmppc_do_h_hash_remove(vcpu->kvm, flags, hash, avpn,
+ &vcpu->arch.gpr[4]);
+}
+
long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index ec69fa45d5a2..238ecf5d0ed8 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -2375,6 +2375,8 @@ hcall_real_table:
.long 0 /* 0x2fc - H_XIRR_X*/
#endif
.long DOTSYM(kvmppc_h_random) - hcall_real_table
+ .space ((H_HASH_REMOVE - 4) - H_RANDOM), 0
+ .long DOTSYM(kvmppc_h_hash_remove) - hcall_real_table
.globl hcall_real_table_end
hcall_real_table_end:
--
2.13.6
next prev parent reply other threads:[~2017-10-27 4:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-27 4:08 [PATCH 00/16] Remove hash page table slot tracking from linux PTE Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 01/16] powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 02/16] powerpc/mm: Update native_hpte_find to return hash pte Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 03/16] powerpc/pseries: Update hpte find helper to take hash value Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 04/16] powerpc/mm: Add hash invalidate callback Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 05/16] powerpc/mm: use hash_invalidate for __kernel_map_pages() Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 06/16] powerpc/mm: Switch flush_hash_range to not use slot Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 07/16] powerpc/mm: Add hash updatepp callback Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 08/16] powerpc/mm/hash: Don't track hash pte slot number in linux page table Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 09/16] powerpc/mm: Add new firmware feature HASH API Aneesh Kumar K.V
2017-10-27 4:08 ` Aneesh Kumar K.V [this message]
2017-10-27 4:08 ` [PATCH 11/16] powerpc/kvm/hash: Implement HASH_PROTECT hcall Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 12/16] powerpc/kvm/hash: Implement HASH_BULK_REMOVE hcall Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 13/16] powerpc/mm/pseries: Use HASH_PROTECT hcall in guest Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 14/16] powerpc/mm/pseries: Use HASH_REMOVE " Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 15/16] powerpc/mm/pseries: Move slot based bulk remove to helper Aneesh Kumar K.V
2017-10-27 4:08 ` [PATCH 16/16] powerpc/mm/pseries: Use HASH_BULK_REMOVE hcall in guest Aneesh Kumar K.V
2017-10-27 4:34 ` [PATCH 00/16] Remove hash page table slot tracking from linux PTE Paul Mackerras
2017-10-27 5:27 ` Aneesh Kumar K.V
2017-10-27 5:41 ` Paul Mackerras
2017-10-30 7:57 ` Aneesh Kumar K.V
2017-10-30 11:49 ` Aneesh Kumar K.V
2017-10-30 13:14 ` Aneesh Kumar K.V
2017-10-30 13:49 ` Aneesh Kumar K.V
2017-11-21 8:41 ` Aneesh Kumar K.V
2017-10-28 22:35 ` Ram Pai
2017-10-29 14:05 ` Aneesh Kumar K.V
2017-10-29 22:04 ` Paul Mackerras
2017-10-30 0:51 ` Ram Pai
2017-11-01 4:46 ` Michael Ellerman
2017-11-01 11:02 ` Paul Mackerras
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171027040833.3644-11-aneesh.kumar@linux.vnet.ibm.com \
--to=aneesh.kumar@linux.vnet.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=paulus@samba.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).