Merge tag 'kvm-arm-for-4.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...

KVM/ARM fixes for v4.5-rc2

A few random fixes, mostly coming from the PMU work by Shannon:

- fix for injecting faults coming from the guest's userspace
- cleanup for our CPTR_EL2 accessors (reserved bits)
- fix for a bug impacting perf (user/kernel discrimination)
- fix for a 32bit sysreg handling bug

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 738a95f..bef6e92 100644 (file)
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -182,6 +182,7 @@
 #define CPTR_EL2_TCPAC (1 << 31)
 #define CPTR_EL2_TTA   (1 << 20)
 #define CPTR_EL2_TFP   (1 << CPTR_EL2_TFP_SHIFT)
+#define CPTR_EL2_DEFAULT       0x000033ff
 
 /* Hyp Debug Configuration Register bits */
 #define MDCR_EL2_TDRA          (1 << 11)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 3066328..779a587 100644 (file)
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -127,10 +127,14 @@ static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 
 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 {
-       u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
+       u32 mode;
 
-       if (vcpu_mode_is_32bit(vcpu))
+       if (vcpu_mode_is_32bit(vcpu)) {
+               mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
                return mode > COMPAT_PSR_MODE_USR;
+       }
+
+       mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 
        return mode != PSR_MODE_EL0t;
 }

diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index ca8f5a5..f0e7bdf 100644 (file)
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -36,7 +36,11 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
        write_sysreg(val, hcr_el2);
        /* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */
        write_sysreg(1 << 15, hstr_el2);
-       write_sysreg(CPTR_EL2_TTA | CPTR_EL2_TFP, cptr_el2);
+
+       val = CPTR_EL2_DEFAULT;
+       val |= CPTR_EL2_TTA | CPTR_EL2_TFP;
+       write_sysreg(val, cptr_el2);
+
        write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
 }
 
@@ -45,7 +49,7 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
        write_sysreg(HCR_RW, hcr_el2);
        write_sysreg(0, hstr_el2);
        write_sysreg(read_sysreg(mdcr_el2) & MDCR_EL2_HPMN_MASK, mdcr_el2);
-       write_sysreg(0, cptr_el2);
+       write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
 }
 
 static void __hyp_text __activate_vm(struct kvm_vcpu *vcpu)

diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index 648112e..4d1ac81 100644 (file)
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -27,7 +27,11 @@
 
 #define PSTATE_FAULT_BITS_64   (PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \
                                 PSR_I_BIT | PSR_D_BIT)
-#define EL1_EXCEPT_SYNC_OFFSET 0x200
+
+#define CURRENT_EL_SP_EL0_VECTOR       0x0
+#define CURRENT_EL_SP_ELx_VECTOR       0x200
+#define LOWER_EL_AArch64_VECTOR                0x400
+#define LOWER_EL_AArch32_VECTOR                0x600
 
 static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
 {
@@ -97,6 +101,34 @@ static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
                *fsr = 0x14;
 }
 
+enum exception_type {
+       except_type_sync        = 0,
+       except_type_irq         = 0x80,
+       except_type_fiq         = 0x100,
+       except_type_serror      = 0x180,
+};
+
+static u64 get_except_vector(struct kvm_vcpu *vcpu, enum exception_type type)
+{
+       u64 exc_offset;
+
+       switch (*vcpu_cpsr(vcpu) & (PSR_MODE_MASK | PSR_MODE32_BIT)) {
+       case PSR_MODE_EL1t:
+               exc_offset = CURRENT_EL_SP_EL0_VECTOR;
+               break;
+       case PSR_MODE_EL1h:
+               exc_offset = CURRENT_EL_SP_ELx_VECTOR;
+               break;
+       case PSR_MODE_EL0t:
+               exc_offset = LOWER_EL_AArch64_VECTOR;
+               break;
+       default:
+               exc_offset = LOWER_EL_AArch32_VECTOR;
+       }
+
+       return vcpu_sys_reg(vcpu, VBAR_EL1) + exc_offset + type;
+}
+
 static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
 {
        unsigned long cpsr = *vcpu_cpsr(vcpu);
@@ -108,8 +140,8 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr
        *vcpu_spsr(vcpu) = cpsr;
        *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
 
+       *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
        *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
-       *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
 
        vcpu_sys_reg(vcpu, FAR_EL1) = addr;
 
@@ -143,8 +175,8 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
        *vcpu_spsr(vcpu) = cpsr;
        *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
 
+       *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
        *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
-       *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
 
        /*
         * Build an unknown exception, depending on the instruction

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index eec3598..2e90371 100644 (file)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1007,10 +1007,9 @@ static int emulate_cp(struct kvm_vcpu *vcpu,
                if (likely(r->access(vcpu, params, r))) {
                        /* Skip instruction, since it was emulated */
                        kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+                       /* Handled */
+                       return 0;
                }
-
-               /* Handled */
-               return 0;
        }
 
        /* Not handled */
@@ -1043,7 +1042,7 @@ static void unhandled_cp_access(struct kvm_vcpu *vcpu,
 }
 
 /**
- * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP15 access
+ * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access
  * @vcpu: The VCPU pointer
  * @run:  The kvm_run struct
  */
@@ -1095,7 +1094,7 @@ out:
 }
 
 /**
- * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
+ * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
  * @vcpu: The VCPU pointer
  * @run:  The kvm_run struct
  */