[PATCH v2 04/28] ARM: KVM: Move CP15 array into the CPU context structure

Marc Zyngier
2016-02-04T11:00:21Z

Continuing our rework of the CPU context, we now move the CP15
array into the CPU context structure. As this causes quite a bit
of churn, we introduce the vcpu_cp15() macro that abstract the
location of the actual array. This will probably help next time
we have to revisit that code.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm/include/asm/kvm_emulate.h | 2 +-
arch/arm/include/asm/kvm_host.h | 6 +++---
arch/arm/include/asm/kvm_mmu.h | 2 +-
arch/arm/kernel/asm-offsets.c | 2 +-
arch/arm/kvm/coproc.c | 32 ++++++++++++++++----------------
arch/arm/kvm/coproc.h | 16 ++++++++--------
arch/arm/kvm/emulate.c | 22 +++++++++++-----------
arch/arm/kvm/interrupts_head.S | 3 ++-
8 files changed, 43 insertions(+), 42 deletions(-)

diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index 3095df0..32bb52a 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -192,7 +192,7 @@ static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)

static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
{
- return vcpu->arch.cp15[c0_MPIDR] & MPIDR_HWID_BITMASK;
+ return vcpu_cp15(vcpu, c0_MPIDR) & MPIDR_HWID_BITMASK;
}

static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index b64ac8e..4203701 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -90,6 +90,7 @@ struct kvm_vcpu_fault_info {

struct kvm_cpu_context {
struct vfp_hard_struct vfp;
+ u32 cp15[NR_CP15_REGS];
};

typedef struct kvm_cpu_context kvm_cpu_context_t;
@@ -102,9 +103,6 @@ struct kvm_vcpu_arch {
int target; /* Processor target */
DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);

- /* System control coprocessor (cp15) */
- u32 cp15[NR_CP15_REGS];
-
/* The CPU type we expose to the VM */
u32 midr;

@@ -161,6 +159,8 @@ struct kvm_vcpu_stat {
u64 exits;
};

+#define vcpu_cp15(v,r) (v)->arch.ctxt.cp15[r]
+
int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index a520b79..da44be9 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -179,7 +179,7 @@ struct kvm;

static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
{
- return (vcpu->arch.cp15[c1_SCTLR] & 0b101) == 0b101;
+ return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101;
}

static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 346bfca..43f8b01 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -172,10 +172,10 @@ int main(void)
#ifdef CONFIG_KVM_ARM_HOST
DEFINE(VCPU_KVM, offsetof(struct kvm_vcpu, kvm));
DEFINE(VCPU_MIDR, offsetof(struct kvm_vcpu, arch.midr));
- DEFINE(VCPU_CP15, offsetof(struct kvm_vcpu, arch.cp15));
DEFINE(VCPU_GUEST_CTXT, offsetof(struct kvm_vcpu, arch.ctxt));
DEFINE(VCPU_HOST_CTXT, offsetof(struct kvm_vcpu, arch.host_cpu_context));
DEFINE(CPU_CTXT_VFP, offsetof(struct kvm_cpu_context, vfp));
+ DEFINE(CPU_CTXT_CP15, offsetof(struct kvm_cpu_context, cp15));
DEFINE(VCPU_REGS, offsetof(struct kvm_vcpu, arch.regs));
DEFINE(VCPU_USR_REGS, offsetof(struct kvm_vcpu, arch.regs.usr_regs));
DEFINE(VCPU_SVC_REGS, offsetof(struct kvm_vcpu, arch.regs.svc_regs));
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index 1a643f3..e3e86c4 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -54,8 +54,8 @@ static inline void vcpu_cp15_reg64_set(struct kvm_vcpu *vcpu,
const struct coproc_reg *r,
u64 val)
{
- vcpu->arch.cp15[r->reg] = val & 0xffffffff;
- vcpu->arch.cp15[r->reg + 1] = val >> 32;
+ vcpu_cp15(vcpu, r->reg) = val & 0xffffffff;
+ vcpu_cp15(vcpu, r->reg + 1) = val >> 32;
}

static inline u64 vcpu_cp15_reg64_get(struct kvm_vcpu *vcpu,
@@ -63,9 +63,9 @@ static inline u64 vcpu_cp15_reg64_get(struct kvm_vcpu *vcpu,
{
u64 val;

- val = vcpu->arch.cp15[r->reg + 1];
+ val = vcpu_cp15(vcpu, r->reg + 1);
val = val << 32;
- val = val | vcpu->arch.cp15[r->reg];
+ val = val | vcpu_cp15(vcpu, r->reg);
return val;
}

@@ -104,7 +104,7 @@ static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
* vcpu_id, but we read the 'U' bit from the underlying
* hardware directly.
*/
- vcpu->arch.cp15[c0_MPIDR] = ((read_cpuid_mpidr() & MPIDR_SMP_BITMASK) |
+ vcpu_cp15(vcpu, c0_MPIDR) = ((read_cpuid_mpidr() & MPIDR_SMP_BITMASK) |
((vcpu->vcpu_id >> 2) << MPIDR_LEVEL_BITS) |
(vcpu->vcpu_id & 3));
}
@@ -117,7 +117,7 @@ static bool access_actlr(struct kvm_vcpu *vcpu,
if (p->is_write)
return ignore_write(vcpu, p);

- *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c1_ACTLR];
+ *vcpu_reg(vcpu, p->Rt1) = vcpu_cp15(vcpu, c1_ACTLR);
return true;
}

@@ -139,7 +139,7 @@ static bool access_l2ctlr(struct kvm_vcpu *vcpu,
if (p->is_write)
return ignore_write(vcpu, p);

- *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c9_L2CTLR];
+ *vcpu_reg(vcpu, p->Rt1) = vcpu_cp15(vcpu, c9_L2CTLR);
return true;
}

@@ -156,7 +156,7 @@ static void reset_l2ctlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
ncores = min(ncores, 3U);
l2ctlr |= (ncores & 3) << 24;

- vcpu->arch.cp15[c9_L2CTLR] = l2ctlr;
+ vcpu_cp15(vcpu, c9_L2CTLR) = l2ctlr;
}

static void reset_actlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
@@ -171,7 +171,7 @@ static void reset_actlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
else
actlr &= ~(1U << 6);

- vcpu->arch.cp15[c1_ACTLR] = actlr;
+ vcpu_cp15(vcpu, c1_ACTLR) = actlr;
}

/*
@@ -218,9 +218,9 @@ bool access_vm_reg(struct kvm_vcpu *vcpu,

BUG_ON(!p->is_write);

- vcpu->arch.cp15[r->reg] = *vcpu_reg(vcpu, p->Rt1);
+ vcpu_cp15(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt1);
if (p->is_64bit)
- vcpu->arch.cp15[r->reg + 1] = *vcpu_reg(vcpu, p->Rt2);
+ vcpu_cp15(vcpu, r->reg + 1) = *vcpu_reg(vcpu, p->Rt2);

kvm_toggle_cache(vcpu, was_enabled);
return true;
@@ -1030,7 +1030,7 @@ int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
val = vcpu_cp15_reg64_get(vcpu, r);
ret = reg_to_user(uaddr, &val, reg->id);
} else if (KVM_REG_SIZE(reg->id) == 4) {
- ret = reg_to_user(uaddr, &vcpu->arch.cp15[r->reg], reg->id);
+ ret = reg_to_user(uaddr, &vcpu_cp15(vcpu, r->reg), reg->id);
}

return ret;
@@ -1060,7 +1060,7 @@ int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
if (!ret)
vcpu_cp15_reg64_set(vcpu, r, val);
} else if (KVM_REG_SIZE(reg->id) == 4) {
- ret = reg_from_user(&vcpu->arch.cp15[r->reg], uaddr, reg->id);
+ ret = reg_from_user(&vcpu_cp15(vcpu, r->reg), uaddr, reg->id);
}

return ret;
@@ -1248,7 +1248,7 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu)
const struct coproc_reg *table;

/* Catch someone adding a register without putting in reset entry. */
- memset(vcpu->arch.cp15, 0x42, sizeof(vcpu->arch.cp15));
+ memset(vcpu->arch.ctxt.cp15, 0x42, sizeof(vcpu->arch.ctxt.cp15));

/* Generic chip reset first (so target could override). */
reset_coproc_regs(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs));
@@ -1257,6 +1257,6 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu)
reset_coproc_regs(vcpu, table, num);

for (num = 1; num < NR_CP15_REGS; num++)
- if (vcpu->arch.cp15[num] == 0x42424242)
- panic("Didn't reset vcpu->arch.cp15[%zi]", num);
+ if (vcpu_cp15(vcpu, num) == 0x42424242)
+ panic("Didn't reset vcpu_cp15(vcpu, %zi)", num);
}
diff --git a/arch/arm/kvm/coproc.h b/arch/arm/kvm/coproc.h
index 88d24a3..2735132 100644
--- a/arch/arm/kvm/coproc.h
+++ b/arch/arm/kvm/coproc.h
@@ -47,7 +47,7 @@ struct coproc_reg {
/* Initialization for vcpu. */
void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);

- /* Index into vcpu->arch.cp15[], or 0 if we don't need to save it. */
+ /* Index into vcpu_cp15(vcpu, ...), or 0 if we don't need to save it. */
unsigned long reg;

/* Value (usually reset value) */
@@ -104,25 +104,25 @@ static inline void reset_unknown(struct kvm_vcpu *vcpu,
const struct coproc_reg *r)
{
BUG_ON(!r->reg);
- BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
- vcpu->arch.cp15[r->reg] = 0xdecafbad;
+ BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
+ vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
}

static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
{
BUG_ON(!r->reg);
- BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.cp15));
- vcpu->arch.cp15[r->reg] = r->val;
+ BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
+ vcpu_cp15(vcpu, r->reg) = r->val;
}

static inline void reset_unknown64(struct kvm_vcpu *vcpu,
const struct coproc_reg *r)
{
BUG_ON(!r->reg);
- BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.cp15));
+ BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));

- vcpu->arch.cp15[r->reg] = 0xdecafbad;
- vcpu->arch.cp15[r->reg+1] = 0xd0c0ffee;
+ vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
+ vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
}

static inline int cmp_reg(const struct coproc_reg *i1,
diff --git a/arch/arm/kvm/emulate.c b/arch/arm/kvm/emulate.c
index dc99159..ee161b1 100644
--- a/arch/arm/kvm/emulate.c
+++ b/arch/arm/kvm/emulate.c
@@ -266,8 +266,8 @@ void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)

static u32 exc_vector_base(struct kvm_vcpu *vcpu)
{
- u32 sctlr = vcpu->arch.cp15[c1_SCTLR];
- u32 vbar = vcpu->arch.cp15[c12_VBAR];
+ u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
+ u32 vbar = vcpu_cp15(vcpu, c12_VBAR);

if (sctlr & SCTLR_V)
return 0xffff0000;
@@ -282,7 +282,7 @@ static u32 exc_vector_base(struct kvm_vcpu *vcpu)
static void kvm_update_psr(struct kvm_vcpu *vcpu, unsigned long mode)
{
unsigned long cpsr = *vcpu_cpsr(vcpu);
- u32 sctlr = vcpu->arch.cp15[c1_SCTLR];
+ u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);

*vcpu_cpsr(vcpu) = (cpsr & ~MODE_MASK) | mode;

@@ -357,22 +357,22 @@ static void inject_abt(struct kvm_vcpu *vcpu, bool is_pabt, unsigned long addr)

if (is_pabt) {
/* Set IFAR and IFSR */
- vcpu->arch.cp15[c6_IFAR] = addr;
- is_lpae = (vcpu->arch.cp15[c2_TTBCR] >> 31);
+ vcpu_cp15(vcpu, c6_IFAR) = addr;
+ is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
/* Always give debug fault for now - should give guest a clue */
if (is_lpae)
- vcpu->arch.cp15[c5_IFSR] = 1 << 9 | 0x22;
+ vcpu_cp15(vcpu, c5_IFSR) = 1 << 9 | 0x22;
else
- vcpu->arch.cp15[c5_IFSR] = 2;
+ vcpu_cp15(vcpu, c5_IFSR) = 2;
} else { /* !iabt */
/* Set DFAR and DFSR */
- vcpu->arch.cp15[c6_DFAR] = addr;
- is_lpae = (vcpu->arch.cp15[c2_TTBCR] >> 31);
+ vcpu_cp15(vcpu, c6_DFAR) = addr;
+ is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
/* Always give debug fault for now - should give guest a clue */
if (is_lpae)
- vcpu->arch.cp15[c5_DFSR] = 1 << 9 | 0x22;
+ vcpu_cp15(vcpu, c5_DFSR) = 1 << 9 | 0x22;
else
- vcpu->arch.cp15[c5_DFSR] = 2;
+ vcpu_cp15(vcpu, c5_DFSR) = 2;
}

}
diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S
index 51a5950..b9d9531 100644
--- a/arch/arm/kvm/interrupts_head.S
+++ b/arch/arm/kvm/interrupts_head.S
@@ -4,7 +4,8 @@
#define VCPU_USR_REG(_reg_nr) (VCPU_USR_REGS + (_reg_nr * 4))
#define VCPU_USR_SP (VCPU_USR_REG(13))
#define VCPU_USR_LR (VCPU_USR_REG(14))
-#define CP15_OFFSET(_cp15_reg_idx) (VCPU_CP15 + (_cp15_reg_idx * 4))
+#define VCPU_CP15_BASE (VCPU_GUEST_CTXT + CPU_CTXT_CP15)
+#define CP15_OFFSET(_cp15_reg_idx) (VCPU_CP15_BASE + (_cp15_reg_idx * 4))

/*
* Many of these macros need to access the VCPU structure, which is always
--
2.1.4