powerpc/64s: Set reserved PCR bits

Currently the reserved bits of the Processor Compatibility
Register (PCR) are cleared as per the Programming Note in Section
1.3.3 of version 3.0B of the Power ISA. This causes all new
architecture features to be made available when running on newer
processors with new architecture features added to the PCR as bits
must be set to disable a given feature.

For example to disable new features added as part of Version 2.07 of
the ISA the corresponding bit in the PCR needs to be set.

As new processor features generally require explicit kernel support
they should be disabled until such support is implemented. Therefore
kernels should set all unknown/reserved bits in the PCR such that any
new architecture features which the kernel does not currently know
about get disabled.

An update is planned to the ISA to clarify that the PCR is an
exception to the Programming Note on reserved bits in Section 1.3.3.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190917004605.22471-2-alistair@popple.id.au

6 files changed, 27 insertions, 12 deletions

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 931939af95d1..b3cbb1136bce 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -478,6 +478,7 @@
 #define   PCR_VEC_DIS   (__MASK(63-0))  /* Vec. disable (bit NA since POWER8) */
 #define   PCR_VSX_DIS   (__MASK(63-1))  /* VSX disable (bit NA since POWER8) */
 #define   PCR_TM_DIS    (__MASK(63-2))  /* Trans. memory disable (POWER8) */
+#define   PCR_HIGH_BITS (PCR_VEC_DIS | PCR_VSX_DIS | PCR_TM_DIS)
 /*
  * These bits are used in the function kvmppc_set_arch_compat() to specify and
  * determine both the compatibility level which we want to emulate and the
@@ -486,6 +487,8 @@
 #define   PCR_ARCH_207  0x8             /* Architecture 2.07 */
 #define   PCR_ARCH_206  0x4             /* Architecture 2.06 */
 #define   PCR_ARCH_205  0x2             /* Architecture 2.05 */
+#define   PCR_LOW_BITS  (PCR_ARCH_207 | PCR_ARCH_206 | PCR_ARCH_205)
+#define   PCR_MASK      ~(PCR_HIGH_BITS | PCR_LOW_BITS) /* PCR Reserved Bits */
 #define SPRN_HEIR       0x153   /* Hypervisor Emulated Instruction Register */
 #define SPRN_TLBINDEXR  0x154   /* P7 TLB control register */
 #define SPRN_TLBVPNR    0x155   /* P7 TLB control register */
diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
index 3239a9fe6c1c..a460298c7ddb 100644
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -23,6 +23,7 @@ _GLOBAL(__setup_cpu_power7)
         beqlr
         li      r0,0
         mtspr   SPRN_LPID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         li      r4,(LPCR_LPES1 >> LPCR_LPES_SH)
@@ -37,6 +38,7 @@ _GLOBAL(__restore_cpu_power7)
         beqlr
         li      r0,0
         mtspr   SPRN_LPID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         li      r4,(LPCR_LPES1 >> LPCR_LPES_SH)
@@ -54,6 +56,7 @@ _GLOBAL(__setup_cpu_power8)
         beqlr
         li      r0,0
         mtspr   SPRN_LPID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         ori     r3, r3, LPCR_PECEDH
@@ -76,6 +79,7 @@ _GLOBAL(__restore_cpu_power8)
         beqlr
         li      r0,0
         mtspr   SPRN_LPID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         ori     r3, r3, LPCR_PECEDH
@@ -98,6 +102,7 @@ _GLOBAL(__setup_cpu_power9)
         mtspr   SPRN_PSSCR,r0
         mtspr   SPRN_LPID,r0
         mtspr   SPRN_PID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE  | LPCR_HEIC)
@@ -123,6 +128,7 @@ _GLOBAL(__restore_cpu_power9)
         mtspr   SPRN_PSSCR,r0
         mtspr   SPRN_LPID,r0
         mtspr   SPRN_PID,r0
+        LOAD_REG_IMMEDIATE(r0, PCR_MASK)
         mtspr   SPRN_PCR,r0
         mfspr   r3,SPRN_LPCR
         LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE | LPCR_HEIC)
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index bd95318d2202..bceee2fde885 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -101,7 +101,7 @@ static void __restore_cpu_cpufeatures(void)
         if (hv_mode) {
                 mtspr(SPRN_LPID, 0);
                 mtspr(SPRN_HFSCR, system_registers.hfscr);
-                mtspr(SPRN_PCR, 0);
+                mtspr(SPRN_PCR, PCR_MASK);
         }
         mtspr(SPRN_FSCR, system_registers.fscr);
 
@@ -144,6 +144,7 @@ static void __init cpufeatures_setup_cpu(void)
                 mtspr(SPRN_HFSCR, 0);
         }
         mtspr(SPRN_FSCR, 0);
+        mtspr(SPRN_PCR, PCR_MASK);
 
         /*
          * LPCR does not get cleared, to match behaviour with secondaries
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index efd8f93bc9dc..709cf1fd4cf4 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -401,8 +401,11 @@ static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
 
         spin_lock(&vc->lock);
         vc->arch_compat = arch_compat;
-        /* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit */
-        vc->pcr = host_pcr_bit - guest_pcr_bit;
+        /*
+         * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
+         * Also set all reserved PCR bits
+         */
+        vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
         spin_unlock(&vc->lock);
 
         return 0;
@@ -3410,7 +3413,7 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
         }
 
         if (vc->pcr)
-                mtspr(SPRN_PCR, vc->pcr);
+                mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
         mtspr(SPRN_DPDES, vc->dpdes);
         mtspr(SPRN_VTB, vc->vtb);
 
@@ -3490,7 +3493,7 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
         vc->vtb = mfspr(SPRN_VTB);
         mtspr(SPRN_DPDES, 0);
         if (vc->pcr)
-                mtspr(SPRN_PCR, 0);
+                mtspr(SPRN_PCR, PCR_MASK);
 
         if (vc->tb_offset_applied) {
                 u64 new_tb = mftb() - vc->tb_offset_applied;
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index fff90f2c3de2..cdf30c6eaf54 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -29,7 +29,7 @@ void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 {
         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 
-        hr->pcr = vc->pcr;
+        hr->pcr = vc->pcr | PCR_MASK;
         hr->dpdes = vc->dpdes;
         hr->hfscr = vcpu->arch.hfscr;
         hr->tb_offset = vc->tb_offset;
@@ -65,7 +65,7 @@ static void byteswap_hv_regs(struct hv_guest_state *hr)
         hr->lpid = swab32(hr->lpid);
         hr->vcpu_token = swab32(hr->vcpu_token);
         hr->lpcr = swab64(hr->lpcr);
-        hr->pcr = swab64(hr->pcr);
+        hr->pcr = swab64(hr->pcr) | PCR_MASK;
         hr->amor = swab64(hr->amor);
         hr->dpdes = swab64(hr->dpdes);
         hr->hfscr = swab64(hr->hfscr);
@@ -148,7 +148,7 @@ static void restore_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr)
 {
         struct kvmppc_vcore *vc = vcpu->arch.vcore;
 
-        vc->pcr = hr->pcr;
+        vc->pcr = hr->pcr | PCR_MASK;
         vc->dpdes = hr->dpdes;
         vcpu->arch.hfscr = hr->hfscr;
         vcpu->arch.dawr = hr->dawr0;
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 9a05b0d932ef..74a9cfe84aee 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -644,8 +644,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
 
         /* Load guest PCR value to select appropriate compat mode */
 37:     ld      r7, VCORE_PCR(r5)
-        cmpdi   r7, 0
+        LOAD_REG_IMMEDIATE(r6, PCR_MASK)
+        cmpld   r7, r6
         beq     38f
+        or      r7, r7, r6
         mtspr   SPRN_PCR, r7
 38:
 
@@ -1913,10 +1915,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
 
         /* Reset PCR */
         ld      r0, VCORE_PCR(r5)
-        cmpdi   r0, 0
+        LOAD_REG_IMMEDIATE(r6, PCR_MASK)
+        cmpld   r0, r6
         beq     18f
-        li      r0, 0
-        mtspr   SPRN_PCR, r0
+        mtspr   SPRN_PCR, r6
 18:
         /* Signal secondary CPUs to continue */
         stb     r0,VCORE_IN_GUEST(r5)