Re: [PATCH v3 5/9] KVM: PPC: Ultravisor: Use UV_WRITE_PATE ucall to register a PATE

2019-06-15 Thread Paul Mackerras
On Thu, Jun 06, 2019 at 02:36:10PM -0300, Claudio Carvalho wrote:
> From: Michael Anderson 
> 
> When running under an ultravisor, the ultravisor controls the real
> partition table and has it in secure memory where the hypervisor can't
> access it, and therefore we (the HV) have to do a ucall whenever we want
> to update an entry.
> 
> The HV still keeps a copy of its view of the partition table in normal
> memory so that the nest MMU can access it.
> 
> Both partition tables will have PATE entries for HV and normal virtual
> machines.

As discussed before, all of this should depend only on
CONFIG_PPC_POWERNV.

Paul.


[PATCH v3 5/9] KVM: PPC: Ultravisor: Use UV_WRITE_PATE ucall to register a PATE

2019-06-06 Thread Claudio Carvalho
From: Michael Anderson 

When running under an ultravisor, the ultravisor controls the real
partition table and has it in secure memory where the hypervisor can't
access it, and therefore we (the HV) have to do a ucall whenever we want
to update an entry.

The HV still keeps a copy of its view of the partition table in normal
memory so that the nest MMU can access it.

Both partition tables will have PATE entries for HV and normal virtual
machines.

Suggested-by: Ryan Grimm 
Signed-off-by: Michael Anderson 
Signed-off-by: Madhavan Srinivasan 
Signed-off-by: Ram Pai 
[Write the pate in HV's table before doing that in UV's]
Signed-off-by: Claudio Carvalho 
---
 arch/powerpc/include/asm/ultravisor-api.h |  5 +++-
 arch/powerpc/include/asm/ultravisor.h | 14 ++
 arch/powerpc/mm/book3s64/hash_utils.c |  3 +-
 arch/powerpc/mm/book3s64/pgtable.c| 34 +--
 arch/powerpc/mm/book3s64/radix_pgtable.c  |  9 --
 5 files changed, 57 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h 
b/arch/powerpc/include/asm/ultravisor-api.h
index 5f538f33c704..24bfb4c1737e 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -15,6 +15,9 @@
 #define U_SUCCESS  H_SUCCESS
 #define U_FUNCTION H_FUNCTION
 #define U_PARAMETERH_PARAMETER
+#define U_PERMISSION   H_PERMISSION
 
-#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
+/* opcodes */
+#define UV_WRITE_PATE  0xF104
 
+#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
diff --git a/arch/powerpc/include/asm/ultravisor.h 
b/arch/powerpc/include/asm/ultravisor.h
index 7500771a8ebd..4ffec7a36acd 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -12,6 +12,8 @@
 
 #if !defined(__ASSEMBLY__)
 
+#include 
+
 /* Internal functions */
 extern int early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
 int depth, void *data);
@@ -28,8 +30,20 @@ extern int early_init_dt_scan_ultravisor(unsigned long node, 
const char *uname,
  */
 #if defined(CONFIG_PPC_UV)
 long ucall(unsigned long opcode, unsigned long *retbuf, ...);
+#else
+static long ucall(unsigned long opcode, unsigned long *retbuf, ...)
+{
+   return U_NOT_AVAILABLE;
+}
 #endif
 
+static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1)
+{
+   unsigned long retbuf[UCALL_BUFSIZE];
+
+   return ucall(UV_WRITE_PATE, retbuf, lpid, dw0, dw1);
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_ULTRAVISOR_H */
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c 
b/arch/powerpc/mm/book3s64/hash_utils.c
index 1ff451892d7f..220a4e133240 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -1080,9 +1080,10 @@ void hash__early_init_mmu_secondary(void)
 
if (!cpu_has_feature(CPU_FTR_ARCH_300))
mtspr(SPRN_SDR1, _SDR1);
-   else
+   else if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
mtspr(SPRN_PTCR,
  __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
+
}
/* Initialize SLB */
slb_initialize();
diff --git a/arch/powerpc/mm/book3s64/pgtable.c 
b/arch/powerpc/mm/book3s64/pgtable.c
index 16bda049187a..40a9fc8b139f 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -16,6 +16,8 @@
 #include 
 #include 
 #include 
+#include 
+#include 
 
 #include 
 #include 
@@ -206,12 +208,25 @@ void __init mmu_partition_table_init(void)
 * 64 K size.
 */
ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12);
-   mtspr(SPRN_PTCR, ptcr);
+   /*
+* If ultravisor is available, it is responsible for creating and
+* managing partition table
+*/
+   if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR))
+   mtspr(SPRN_PTCR, ptcr);
+
+   /*
+* Since nestMMU cannot access secure memory. Create
+* and manage our own partition table. This table
+* contains entries for nonsecure and hypervisor
+* partition.
+*/
powernv_set_nmmu_ptcr(ptcr);
 }
 
-void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
-  unsigned long dw1)
+static void __mmu_partition_table_set_entry(unsigned int lpid,
+   unsigned long dw0,
+   unsigned long dw1)
 {
unsigned long old = be64_to_cpu(partition_tb[lpid].patb0);
 
@@ -238,6 +253,19 @@ void mmu_partition_table_set_entry(unsigned int lpid, 
unsigned long dw0,
/* do we need fixup here ?*/
asm volatile("eieio; tlbsync; ptesync" : : : "memory");
 }
+
+void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
+ unsigned long dw1)
+{
+