linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
* [PATCH v3 0/2] Support for H_RPT_INVALIDATE in PowerPC KVM
@ 2021-01-05  9:05 Bharata B Rao
  2021-01-05  9:05 ` [PATCH v3 1/2] KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE Bharata B Rao
  2021-01-05  9:05 ` [PATCH v3 2/2] KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM Bharata B Rao
  0 siblings, 2 replies; 4+ messages in thread
From: Bharata B Rao @ 2021-01-05  9:05 UTC (permalink / raw)
  To: kvm-ppc, linuxppc-dev
  Cc: farosas, aneesh.kumar, npiggin, Bharata B Rao, david

This patchset adds support for the new hcall H_RPT_INVALIDATE
and replaces the nested tlb flush calls with this new hcall
if support for the same exists.

Changes in v3:
-------------
- Reused the tlb flush routines from radix_tlb.c
- Ensured fixups are take care of due to the above change.
 
v2: https://lore.kernel.org/linuxppc-dev/20201217033335.GD310465@yekko.fritz.box/T/#t

H_RPT_INVALIDATE
================
Syntax:
int64   /* H_Success: Return code on successful completion */
        /* H_Busy - repeat the call with the same */
        /* H_Parameter, H_P2, H_P3, H_P4, H_P5 : Invalid parameters */
        hcall(const uint64 H_RPT_INVALIDATE, /* Invalidate RPT translation lookaside information */
              uint64 pid,       /* PID/LPID to invalidate */
              uint64 target,    /* Invalidation target */
              uint64 type,      /* Type of lookaside information */
              uint64 pageSizes,     /* Page sizes */
              uint64 start,     /* Start of Effective Address (EA) range (inclusive) */
              uint64 end)       /* End of EA range (exclusive) */

Invalidation targets (target)
-----------------------------
Core MMU        0x01 /* All virtual processors in the partition */
Core local MMU  0x02 /* Current virtual processor */
Nest MMU        0x04 /* All nest/accelerator agents in use by the partition */

A combination of the above can be specified, except core and core local.

Type of translation to invalidate (type)
---------------------------------------
NESTED       0x0001  /* Invalidate nested guest partition-scope */
TLB          0x0002  /* Invalidate TLB */
PWC          0x0004  /* Invalidate Page Walk Cache */
PRT          0x0008  /* Invalidate Process Table Entries if NESTED is clear */
PAT          0x0008  /* Invalidate Partition Table Entries if NESTED is set */

A combination of the above can be specified.

Page size mask (pageSizes)
--------------------------
4K              0x01
64K             0x02
2M              0x04
1G              0x08
All sizes       (-1UL)

A combination of the above can be specified.
All page sizes can be selected with -1.

Semantics: Invalidate radix tree lookaside information
           matching the parameters given.
* Return H_P2, H_P3 or H_P4 if target, type, or pageSizes parameters are
  different from the defined values.
* Return H_PARAMETER if NESTED is set and pid is not a valid nested
  LPID allocated to this partition
* Return H_P5 if (start, end) doesn't form a valid range. Start and end
  should be a valid Quadrant address and  end > start.
* Return H_NotSupported if the partition is not in running in radix
  translation mode.
* May invalidate more translation information than requested.
* If start = 0 and end = -1, set the range to cover all valid addresses.
  Else start and end should be aligned to 4kB (lower 11 bits clear).
* If NESTED is clear, then invalidate process scoped lookaside information.
  Else pid specifies a nested LPID, and the invalidation is performed
  on nested guest partition table and nested guest partition scope real
  addresses.
* If pid = 0 and NESTED is clear, then valid addresses are quadrant 3 and
  quadrant 0 spaces, Else valid addresses are quadrant 0.
* Pages which are fully covered by the range are to be invalidated.
  Those which are partially covered are considered outside invalidation
  range, which allows a caller to optimally invalidate ranges that may
  contain mixed page sizes.
* Return H_SUCCESS on success.

Bharata B Rao (2):
  KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE
  KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM

 Documentation/virt/kvm/api.rst                |  17 +++
 .../include/asm/book3s/64/tlbflush-radix.h    |  18 +++
 arch/powerpc/include/asm/kvm_book3s.h         |   3 +
 arch/powerpc/include/asm/mmu_context.h        |   7 ++
 arch/powerpc/kvm/book3s_64_mmu_radix.c        |  27 ++++-
 arch/powerpc/kvm/book3s_hv.c                  |  56 +++++++++
 arch/powerpc/kvm/book3s_hv_nested.c           | 108 +++++++++++++++++-
 arch/powerpc/kvm/powerpc.c                    |   3 +
 arch/powerpc/mm/book3s64/radix_tlb.c          |  24 +++-
 include/uapi/linux/kvm.h                      |   1 +
 10 files changed, 253 insertions(+), 11 deletions(-)

-- 
2.26.2


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH v3 1/2] KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE
  2021-01-05  9:05 [PATCH v3 0/2] Support for H_RPT_INVALIDATE in PowerPC KVM Bharata B Rao
@ 2021-01-05  9:05 ` Bharata B Rao
       [not found]   ` <87k0sp95g0.fsf@linux.ibm.com>
  2021-01-05  9:05 ` [PATCH v3 2/2] KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM Bharata B Rao
  1 sibling, 1 reply; 4+ messages in thread
From: Bharata B Rao @ 2021-01-05  9:05 UTC (permalink / raw)
  To: kvm-ppc, linuxppc-dev
  Cc: farosas, aneesh.kumar, npiggin, Bharata B Rao, david

Implement H_RPT_INVALIDATE hcall and add KVM capability
KVM_CAP_PPC_RPT_INVALIDATE to indicate the support for the same.

This hcall does two types of TLB invalidations:

1. Process-scoped invalidations for guests with LPCR[GTSE]=0.
   This is currently not used in KVM as GTSE is not usually
   disabled in KVM.
2. Partition-scoped invalidations that an L1 hypervisor does on
   behalf of an L2 guest. This replaces the uses of the existing
   hcall H_TLB_INVALIDATE.

Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
---
 Documentation/virt/kvm/api.rst                | 17 ++++
 .../include/asm/book3s/64/tlbflush-radix.h    | 18 ++++
 arch/powerpc/include/asm/kvm_book3s.h         |  3 +
 arch/powerpc/include/asm/mmu_context.h        |  7 ++
 arch/powerpc/kvm/book3s_hv.c                  | 56 +++++++++++
 arch/powerpc/kvm/book3s_hv_nested.c           | 96 +++++++++++++++++++
 arch/powerpc/kvm/powerpc.c                    |  3 +
 arch/powerpc/mm/book3s64/radix_tlb.c          | 24 ++++-
 include/uapi/linux/kvm.h                      |  1 +
 9 files changed, 221 insertions(+), 4 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 70254eaa5229..acf1fb4a0e1d 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6032,6 +6032,23 @@ KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications which user space
 can then handle to implement model specific MSR handling and/or user notifications
 to inform a user that an MSR was not handled.
 
+7.22 KVM_CAP_PPC_RPT_INVALIDATE
+------------------------------
+
+:Capability: KVM_CAP_PPC_RPT_INVALIDATE
+:Architectures: ppc
+:Type: vm
+
+This capability indicates that the kernel is capable of handling
+H_RPT_INVALIDATE hcall.
+
+In order to enable the use of H_RPT_INVALIDATE in the guest,
+user space might have to advertise it for the guest. For example,
+IBM pSeries (sPAPR) guest starts using it if "hcall-rpt-invalidate" is
+present in the "ibm,hypertas-functions" device-tree property.
+
+This capability is always enabled.
+
 8. Other capabilities.
 ======================
 
diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
index 94439e0cefc9..aace7e9b2397 100644
--- a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
@@ -4,6 +4,10 @@
 
 #include <asm/hvcall.h>
 
+#define RIC_FLUSH_TLB 0
+#define RIC_FLUSH_PWC 1
+#define RIC_FLUSH_ALL 2
+
 struct vm_area_struct;
 struct mm_struct;
 struct mmu_gather;
@@ -21,6 +25,20 @@ static inline u64 psize_to_rpti_pgsize(unsigned long psize)
 	return H_RPTI_PAGE_ALL;
 }
 
+static inline int rpti_pgsize_to_psize(unsigned long page_size)
+{
+	if (page_size == H_RPTI_PAGE_4K)
+		return MMU_PAGE_4K;
+	if (page_size == H_RPTI_PAGE_64K)
+		return MMU_PAGE_64K;
+	if (page_size == H_RPTI_PAGE_2M)
+		return MMU_PAGE_2M;
+	if (page_size == H_RPTI_PAGE_1G)
+		return MMU_PAGE_1G;
+	else
+		return MMU_PAGE_64K; /* Default */
+}
+
 static inline int mmu_get_ap(int psize)
 {
 	return mmu_psize_defs[psize].ap;
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index d32ec9ae73bd..0f1c5fa6e8ce 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -298,6 +298,9 @@ void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1);
 void kvmhv_release_all_nested(struct kvm *kvm);
 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu);
 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu);
+long kvmhv_h_rpti_nested(struct kvm_vcpu *vcpu, unsigned long lpid,
+			 unsigned long type, unsigned long pg_sizes,
+			 unsigned long start, unsigned long end);
 int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu,
 			  u64 time_limit, unsigned long lpcr);
 void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr);
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index d5821834dba9..17b2995a55ed 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -124,8 +124,15 @@ static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
 
 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
+void do_h_rpt_invalidate(unsigned long pid, unsigned long type,
+			 unsigned long page_size, unsigned long psize,
+			 unsigned long start, unsigned long end);
 #else
 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
+static inline void do_h_rpt_invalidate(unsigned long pid, unsigned long type,
+				       unsigned long page_size,
+				       unsigned long psize, unsigned long start,
+				       unsigned long end) { }
 #endif
 
 extern void switch_cop(struct mm_struct *next);
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 6f612d240392..8df391b63330 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -904,6 +904,53 @@ static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
 	return yield_count;
 }
 
+static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu,
+				    unsigned long pid, unsigned long target,
+				    unsigned long type, unsigned long pg_sizes,
+				    unsigned long start, unsigned long end)
+{
+	unsigned long psize;
+
+	if (!kvm_is_radix(vcpu->kvm))
+		return H_UNSUPPORTED;
+
+	if (end < start)
+		return H_P5;
+
+	if (type & H_RPTI_TYPE_NESTED) {
+		if (!nesting_enabled(vcpu->kvm))
+			return H_FUNCTION;
+
+		/* Support only cores as target */
+		if (target != H_RPTI_TARGET_CMMU)
+			return H_P2;
+
+		return kvmhv_h_rpti_nested(vcpu, pid,
+					   (type & ~H_RPTI_TYPE_NESTED),
+					    pg_sizes, start, end);
+	}
+
+	if (pg_sizes & H_RPTI_PAGE_64K) {
+		psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_64K);
+		do_h_rpt_invalidate(pid, type, (1UL << 16), psize,
+				    start, end);
+	}
+
+	if (pg_sizes & H_RPTI_PAGE_2M) {
+		psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_2M);
+		do_h_rpt_invalidate(pid, type, (1UL << 21), psize,
+				    start, end);
+	}
+
+	if (pg_sizes & H_RPTI_PAGE_1G) {
+		psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_1G);
+		do_h_rpt_invalidate(pid, type, (1UL << 30), psize,
+				    start, end);
+	}
+
+	return H_SUCCESS;
+}
+
 int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 {
 	unsigned long req = kvmppc_get_gpr(vcpu, 3);
@@ -1112,6 +1159,14 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
 		 */
 		ret = kvmppc_h_svm_init_abort(vcpu->kvm);
 		break;
+	case H_RPT_INVALIDATE:
+		ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4),
+					      kvmppc_get_gpr(vcpu, 5),
+					      kvmppc_get_gpr(vcpu, 6),
+					      kvmppc_get_gpr(vcpu, 7),
+					      kvmppc_get_gpr(vcpu, 8),
+					      kvmppc_get_gpr(vcpu, 9));
+		break;
 
 	default:
 		return RESUME_HOST;
@@ -1158,6 +1213,7 @@ static int kvmppc_hcall_impl_hv(unsigned long cmd)
 	case H_XIRR_X:
 #endif
 	case H_PAGE_INIT:
+	case H_RPT_INVALIDATE:
 		return 1;
 	}
 
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 33b58549a9aa..40ed4eb80adb 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -1149,6 +1149,102 @@ long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu)
 	return H_SUCCESS;
 }
 
+static long do_tlb_invalidate_nested_tlb(struct kvm_vcpu *vcpu,
+					 unsigned long lpid,
+					 unsigned long page_size,
+					 unsigned long ap,
+					 unsigned long start,
+					 unsigned long end)
+{
+	unsigned long addr = start;
+	int ret;
+
+	do {
+		ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap,
+						   get_epn(addr));
+		if (ret)
+			return ret;
+		addr += page_size;
+	} while (addr < end);
+
+	return ret;
+}
+
+static long do_tlb_invalidate_nested_all(struct kvm_vcpu *vcpu,
+					 unsigned long lpid)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_nested_guest *gp;
+
+	gp = kvmhv_get_nested(kvm, lpid, false);
+	if (gp) {
+		kvmhv_emulate_tlbie_lpid(vcpu, gp, RIC_FLUSH_ALL);
+		kvmhv_put_nested(gp);
+	}
+	return H_SUCCESS;
+}
+
+long kvmhv_h_rpti_nested(struct kvm_vcpu *vcpu, unsigned long lpid,
+			 unsigned long type, unsigned long pg_sizes,
+			 unsigned long start, unsigned long end)
+{
+	struct kvm_nested_guest *gp;
+	long ret;
+	unsigned long psize, ap;
+
+	/*
+	 * If L2 lpid isn't valid, we need to return H_PARAMETER.
+	 *
+	 * However, nested KVM issues a L2 lpid flush call when creating
+	 * partition table entries for L2. This happens even before the
+	 * corresponding shadow lpid is created in HV which happens in
+	 * H_ENTER_NESTED call. Since we can't differentiate this case from
+	 * the invalid case, we ignore such flush requests and return success.
+	 */
+	gp = kvmhv_find_nested(vcpu->kvm, lpid);
+	if (!gp)
+		return H_SUCCESS;
+
+	if ((type & H_RPTI_TYPE_NESTED_ALL) == H_RPTI_TYPE_NESTED_ALL)
+		return do_tlb_invalidate_nested_all(vcpu, lpid);
+
+	if ((type & H_RPTI_TYPE_TLB) == H_RPTI_TYPE_TLB) {
+		if (pg_sizes & H_RPTI_PAGE_64K) {
+			psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_64K);
+			ap = mmu_get_ap(psize);
+
+			ret = do_tlb_invalidate_nested_tlb(vcpu, lpid,
+							   (1UL << 16),
+							   ap, start, end);
+			if (ret)
+				return H_P4;
+		}
+
+		if (pg_sizes & H_RPTI_PAGE_2M) {
+			psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_2M);
+			ap = mmu_get_ap(psize);
+
+			ret = do_tlb_invalidate_nested_tlb(vcpu, lpid,
+							   (1UL << 21),
+							   ap, start, end);
+			if (ret)
+				return H_P4;
+		}
+
+		if (pg_sizes & H_RPTI_PAGE_1G) {
+			psize = rpti_pgsize_to_psize(pg_sizes & H_RPTI_PAGE_1G);
+			ap = mmu_get_ap(psize);
+
+			ret = do_tlb_invalidate_nested_tlb(vcpu, lpid,
+							   (1UL << 30),
+							   ap, start, end);
+			if (ret)
+				return H_P4;
+		}
+	}
+	return H_SUCCESS;
+}
+
 /* Used to convert a nested guest real address to a L1 guest real address */
 static int kvmhv_translate_addr_nested(struct kvm_vcpu *vcpu,
 				       struct kvm_nested_guest *gp,
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index cf52d26f49cd..5388cd4a206a 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -678,6 +678,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = hv_enabled && kvmppc_hv_ops->enable_svm &&
 			!kvmppc_hv_ops->enable_svm(NULL);
 		break;
+	case KVM_CAP_PPC_RPT_INVALIDATE:
+		r = 1;
+		break;
 #endif
 	default:
 		r = 0;
diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c
index fb66d154b26c..c120a2ad4684 100644
--- a/arch/powerpc/mm/book3s64/radix_tlb.c
+++ b/arch/powerpc/mm/book3s64/radix_tlb.c
@@ -18,10 +18,6 @@
 #include <asm/cputhreads.h>
 #include <asm/plpar_wrappers.h>
 
-#define RIC_FLUSH_TLB 0
-#define RIC_FLUSH_PWC 1
-#define RIC_FLUSH_ALL 2
-
 /*
  * tlbiel instruction for radix, set invalidation
  * i.e., r=1 and is=01 or is=10 or is=11
@@ -1286,4 +1282,24 @@ extern void radix_kvm_prefetch_workaround(struct mm_struct *mm)
 	}
 }
 EXPORT_SYMBOL_GPL(radix_kvm_prefetch_workaround);
+
+void do_h_rpt_invalidate(unsigned long pid, unsigned long type,
+			 unsigned long page_size, unsigned long psize,
+			 unsigned long start, unsigned long end)
+{
+	if ((type & H_RPTI_TYPE_ALL) == H_RPTI_TYPE_ALL) {
+		_tlbie_pid(pid, RIC_FLUSH_ALL);
+		return;
+	}
+
+	if (type & H_RPTI_TYPE_PWC)
+		_tlbie_pid(pid, RIC_FLUSH_PWC);
+
+	if (!start && end == -1) /* PID */
+		_tlbie_pid(pid, RIC_FLUSH_TLB);
+	else /* EA */
+		_tlbie_va_range(start, end, pid, page_size, psize, false);
+}
+EXPORT_SYMBOL_GPL(do_h_rpt_invalidate);
+
 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 886802b8ffba..ae9854830dcc 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1056,6 +1056,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_ENFORCE_PV_FEATURE_CPUID 190
 #define KVM_CAP_SYS_HYPERV_CPUID 191
 #define KVM_CAP_DIRTY_LOG_RING 192
+#define KVM_CAP_PPC_RPT_INVALIDATE 193
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.26.2


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH v3 2/2] KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM
  2021-01-05  9:05 [PATCH v3 0/2] Support for H_RPT_INVALIDATE in PowerPC KVM Bharata B Rao
  2021-01-05  9:05 ` [PATCH v3 1/2] KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE Bharata B Rao
@ 2021-01-05  9:05 ` Bharata B Rao
  1 sibling, 0 replies; 4+ messages in thread
From: Bharata B Rao @ 2021-01-05  9:05 UTC (permalink / raw)
  To: kvm-ppc, linuxppc-dev
  Cc: farosas, aneesh.kumar, npiggin, Bharata B Rao, david

In the nested KVM case, replace H_TLB_INVALIDATE by the new hcall
H_RPT_INVALIDATE if available. The availability of this hcall
is determined from "hcall-rpt-invalidate" string in ibm,hypertas-functions
DT property.

Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
---
 arch/powerpc/kvm/book3s_64_mmu_radix.c | 27 +++++++++++++++++++++-----
 arch/powerpc/kvm/book3s_hv_nested.c    | 12 ++++++++++--
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index bb35490400e9..7ea5459022cb 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -21,6 +21,7 @@
 #include <asm/pte-walk.h>
 #include <asm/ultravisor.h>
 #include <asm/kvm_book3s_uvmem.h>
+#include <asm/plpar_wrappers.h>
 
 /*
  * Supported radix tree geometry.
@@ -318,9 +319,19 @@ void kvmppc_radix_tlbie_page(struct kvm *kvm, unsigned long addr,
 	}
 
 	psi = shift_to_mmu_psize(pshift);
-	rb = addr | (mmu_get_ap(psi) << PPC_BITLSHIFT(58));
-	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(0, 0, 1),
-				lpid, rb);
+
+	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE)) {
+		rb = addr | (mmu_get_ap(psi) << PPC_BITLSHIFT(58));
+		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(0, 0, 1),
+					lpid, rb);
+	} else {
+		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
+					    H_RPTI_TYPE_NESTED |
+					    H_RPTI_TYPE_TLB,
+					    psize_to_rpti_pgsize(psi),
+					    addr, addr + psize);
+	}
+
 	if (rc)
 		pr_err("KVM: TLB page invalidation hcall failed, rc=%ld\n", rc);
 }
@@ -334,8 +345,14 @@ static void kvmppc_radix_flush_pwc(struct kvm *kvm, unsigned int lpid)
 		return;
 	}
 
-	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(1, 0, 1),
-				lpid, TLBIEL_INVAL_SET_LPID);
+	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
+		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(1, 0, 1),
+					lpid, TLBIEL_INVAL_SET_LPID);
+	else
+		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
+					    H_RPTI_TYPE_NESTED |
+					    H_RPTI_TYPE_PWC, H_RPTI_PAGE_ALL,
+					    0, -1UL);
 	if (rc)
 		pr_err("KVM: TLB PWC invalidation hcall failed, rc=%ld\n", rc);
 }
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 40ed4eb80adb..0ebddb615684 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -19,6 +19,7 @@
 #include <asm/pgalloc.h>
 #include <asm/pte-walk.h>
 #include <asm/reg.h>
+#include <asm/plpar_wrappers.h>
 
 static struct patb_entry *pseries_partition_tb;
 
@@ -402,8 +403,15 @@ static void kvmhv_flush_lpid(unsigned int lpid)
 		return;
 	}
 
-	rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1),
-				lpid, TLBIEL_INVAL_SET_LPID);
+	if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
+		rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1),
+					lpid, TLBIEL_INVAL_SET_LPID);
+	else
+		rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU,
+					    H_RPTI_TYPE_NESTED |
+					    H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC |
+					    H_RPTI_TYPE_PAT,
+					    H_RPTI_PAGE_ALL, 0, -1UL);
 	if (rc)
 		pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc);
 }
-- 
2.26.2


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v3 1/2] KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE
       [not found]   ` <87k0sp95g0.fsf@linux.ibm.com>
@ 2021-01-07  4:08     ` Bharata B Rao
  0 siblings, 0 replies; 4+ messages in thread
From: Bharata B Rao @ 2021-01-07  4:08 UTC (permalink / raw)
  To: Fabiano Rosas; +Cc: aneesh.kumar, npiggin, kvm-ppc, linuxppc-dev, david

On Wed, Jan 06, 2021 at 05:27:27PM -0300, Fabiano Rosas wrote:
> Bharata B Rao <bharata@linux.ibm.com> writes:
> > +
> > +long kvmhv_h_rpti_nested(struct kvm_vcpu *vcpu, unsigned long lpid,
> > +			 unsigned long type, unsigned long pg_sizes,
> > +			 unsigned long start, unsigned long end)
> > +{
> > +	struct kvm_nested_guest *gp;
> > +	long ret;
> > +	unsigned long psize, ap;
> > +
> > +	/*
> > +	 * If L2 lpid isn't valid, we need to return H_PARAMETER.
> > +	 *
> > +	 * However, nested KVM issues a L2 lpid flush call when creating
> > +	 * partition table entries for L2. This happens even before the
> > +	 * corresponding shadow lpid is created in HV which happens in
> > +	 * H_ENTER_NESTED call. Since we can't differentiate this case from
> > +	 * the invalid case, we ignore such flush requests and return success.
> > +	 */
> 
> So for a nested lpid the H_TLB_INVALIDATE in:
> 
> kvmppc_core_init_vm_hv -> kvmppc_setup_partition_table ->
> kvmhv_set_ptbl_entry -> kvmhv_flush_lpid
> 
> has always been a noop? It seems that we could just skip
> kvmhv_flush_lpid in L1 during init_vm then.

May be, but I suppose that flush is required and could be fixed
eventually.

Regards,
Bharata.

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-01-07  4:10 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-05  9:05 [PATCH v3 0/2] Support for H_RPT_INVALIDATE in PowerPC KVM Bharata B Rao
2021-01-05  9:05 ` [PATCH v3 1/2] KVM: PPC: Book3S HV: Add support for H_RPT_INVALIDATE Bharata B Rao
     [not found]   ` <87k0sp95g0.fsf@linux.ibm.com>
2021-01-07  4:08     ` Bharata B Rao
2021-01-05  9:05 ` [PATCH v3 2/2] KVM: PPC: Book3S HV: Use H_RPT_INVALIDATE in nested KVM Bharata B Rao

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).