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Date: Fri, 09 Mar 2012 14:56:52 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: Russell King <linux@....linux.org.uk>,
linux-arm-kernel@...ts.infradead.org
CC: linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] ARM: KVM: make emulation functions return bool.
From: Rusty Russell <rusty@...tcorp.com.au>
Simplifies error handling into the parent: all errors mean
"can't emulate".
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
arch/arm/kvm/emulate.c | 44 ++++++++++++++++++++++----------------------
1 files changed, 22 insertions(+), 22 deletions(-)
diff --git a/arch/arm/kvm/emulate.c b/arch/arm/kvm/emulate.c
index 88c6493..d386874 100644
--- a/arch/arm/kvm/emulate.c
+++ b/arch/arm/kvm/emulate.c
@@ -212,8 +212,8 @@ int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
* @vcpu: The VCPU pointer
* @p: The coprocessor parameters struct pointer holding trap inst. details
*/
-static int emulate_cp15_c9_access(struct kvm_vcpu *vcpu,
- const struct coproc_params *p)
+static bool emulate_cp15_c9_access(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p)
{
BUG_ON(p->CRn != 9);
BUG_ON(p->is_64bit);
@@ -223,7 +223,7 @@ static int emulate_cp15_c9_access(struct kvm_vcpu *vcpu,
u32 l2ctlr, ncores;
if (p->is_write)
- return 0;
+ return true;
asm volatile("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
l2ctlr &= ~(3 << 24);
@@ -231,13 +231,13 @@ static int emulate_cp15_c9_access(struct kvm_vcpu *vcpu,
l2ctlr |= (ncores & 3) << 24;
*vcpu_reg(vcpu, p->Rt1) = l2ctlr;
- return 0;
+ return true;
}
/* hack alert!!! */
if (!p->is_write)
*vcpu_reg(vcpu, p->Rt1) = 0;
- return 0;
+ return true;
}
/**
@@ -250,8 +250,8 @@ static int emulate_cp15_c9_access(struct kvm_vcpu *vcpu,
* host/guest PRRR and NMRR memory remap registers and allow guest direct access
* to these registers.
*/
-static int emulate_cp15_c10_access(struct kvm_vcpu *vcpu,
- const struct coproc_params *p)
+static bool emulate_cp15_c10_access(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p)
{
BUG_ON(p->CRn != 10);
BUG_ON(p->is_64bit);
@@ -259,7 +259,7 @@ static int emulate_cp15_c10_access(struct kvm_vcpu *vcpu,
if ((p->CRm == 0 || p->CRm == 1 || p->CRm == 4 || p->CRm == 8) &&
(p->Op2 <= 7)) {
/* TLB Lockdown operations - ignored */
- return 0;
+ return true;
}
/*
@@ -270,15 +270,15 @@ static int emulate_cp15_c10_access(struct kvm_vcpu *vcpu,
if (p->CRm == 2 && p->Op1 == 0 && p->Op2 == 0) {
cp15_op(vcpu, p, c10_PRRR);
- return 0;
+ return true;
}
if (p->CRm == 2 && p->Op1 == 0 && p->Op2 == 1) {
cp15_op(vcpu, p, c10_NMRR);
- return 0;
+ return true;
}
- return -EINVAL;
+ return false;
}
/**
@@ -292,8 +292,8 @@ static int emulate_cp15_c10_access(struct kvm_vcpu *vcpu,
*
* This may need to be refined.
*/
-static int emulate_cp15_c15_access(struct kvm_vcpu *vcpu,
- const struct coproc_params *p)
+static bool emulate_cp15_c15_access(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p)
{
trace_kvm_emulate_cp15_imp(p->Op1, p->Rt1, p->CRn, p->CRm,
p->Op2, p->is_write);
@@ -301,14 +301,14 @@ static int emulate_cp15_c15_access(struct kvm_vcpu *vcpu,
if (!p->is_write)
*vcpu_reg(vcpu, p->Rt1) = 0;
- return 0;
+ return true;
}
static int emulate_cp15(struct kvm_vcpu *vcpu,
const struct coproc_params *params)
{
unsigned long instr_len;
- int ret;
+ bool ok;
/* So far no mrrc/mcrr accesses are emulated */
if (params->is_64bit)
@@ -316,31 +316,31 @@ static int emulate_cp15(struct kvm_vcpu *vcpu,
switch (params->CRn) {
case 9:
- ret = emulate_cp15_c9_access(vcpu, params);
+ ok = emulate_cp15_c9_access(vcpu, params);
break;
case 10:
- ret = emulate_cp15_c10_access(vcpu, params);
+ ok = emulate_cp15_c10_access(vcpu, params);
break;
case 15:
- ret = emulate_cp15_c15_access(vcpu, params);
+ ok = emulate_cp15_c15_access(vcpu, params);
break;
default:
- ret = -EINVAL;
+ ok = false;
}
- if (ret != 0)
+ if (!ok)
goto unsupp_err_out;
/* Skip instruction, since it was emulated */
instr_len = ((vcpu->arch.hsr >> 25) & 1) ? 4 : 2;
*vcpu_reg(vcpu, 15) += instr_len;
- return ret;
+ return 0;
unsupp_err_out:
kvm_err("Unsupported guest CP15 access at: %08x\n", vcpu->arch.regs.pc);
print_cp_instr(params);
- return ret;
+ return -EINVAL;
}
/**
--
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