[PATCH v2 12/17] KVM: arm64: Move ELR_EL1 to the system register array

Marc Zyngier
2020-06-15T13:34:21Z

As ELR-EL1 is a VNCR-capable register with ARMv8.4-NV, let's move it to
the sys_regs array and repaint the accessors. While we're at it, let's
kill the now useless accessors used only on the fault injection path.

Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/kvm_emulate.h | 21 ---------------------
arch/arm64/include/asm/kvm_host.h | 3 ++-
arch/arm64/kvm/guest.c | 2 +-
arch/arm64/kvm/hyp/sysreg-sr.c | 4 ++--
arch/arm64/kvm/inject_fault.c | 2 +-
arch/arm64/kvm/sys_regs.c | 2 ++
6 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 862a70060217..3b1d32c639c2 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -127,27 +127,6 @@ static __always_inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
return (unsigned long *)&vcpu_gp_regs(vcpu)->pc;
}

-static inline unsigned long *__vcpu_elr_el1(const struct kvm_vcpu *vcpu)
-{
- return (unsigned long *)&vcpu->arch.ctxt.elr_el1;
-}
-
-static inline unsigned long vcpu_read_elr_el1(const struct kvm_vcpu *vcpu)
-{
- if (vcpu->arch.sysregs_loaded_on_cpu)
- return read_sysreg_el1(SYS_ELR);
- else
- return *__vcpu_elr_el1(vcpu);
-}
-
-static inline void vcpu_write_elr_el1(const struct kvm_vcpu *vcpu, unsigned long v)
-{
- if (vcpu->arch.sysregs_loaded_on_cpu)
- write_sysreg_el1(v, SYS_ELR);
- else
- *__vcpu_elr_el1(vcpu) = v;
-}
-
static __always_inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
{
return (unsigned long *)&vcpu_gp_regs(vcpu)->pstate;
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index b633c572ca36..680cfca9ef93 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -185,6 +185,8 @@ enum vcpu_sysreg {
APGAKEYLO_EL1,
APGAKEYHI_EL1,

+ ELR_EL1,
+
/* 32bit specific registers. Keep them at the end of the range */
DACR32_EL2, /* Domain Access Control Register */
IFSR32_EL2, /* Instruction Fault Status Register */
@@ -239,7 +241,6 @@ struct kvm_cpu_context {
struct user_pt_regs regs; /* sp = sp_el0 */

u64 sp_el1;
- u64 elr_el1;

u64 spsr[KVM_NR_SPSR];

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 9dd5bbeefae6..99ff09ad24e8 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -132,7 +132,7 @@ static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
return &vcpu->arch.ctxt.sp_el1;

case KVM_REG_ARM_CORE_REG(elr_el1):
- return &vcpu->arch.ctxt.elr_el1;
+ return __ctxt_sys_reg(&vcpu->arch.ctxt, ELR_EL1);

case KVM_REG_ARM_CORE_REG(spsr[0]) ...
KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 10221bec3f32..aa8ba288220c 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -56,7 +56,7 @@ static void __hyp_text __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
ctxt_sys_reg(ctxt, TPIDR_EL1) = read_sysreg(tpidr_el1);

ctxt->sp_el1 = read_sysreg(sp_el1);
- ctxt->elr_el1 = read_sysreg_el1(SYS_ELR);
+ ctxt_sys_reg(ctxt, ELR_EL1) = read_sysreg_el1(SYS_ELR);
ctxt->spsr[KVM_SPSR_EL1] = read_sysreg_el1(SYS_SPSR);
}

@@ -156,7 +156,7 @@ static void __hyp_text __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
}

write_sysreg(ctxt->sp_el1, sp_el1);
- write_sysreg_el1(ctxt->elr_el1, SYS_ELR);
+ write_sysreg_el1(ctxt_sys_reg(ctxt, ELR_EL1), SYS_ELR);
write_sysreg_el1(ctxt->spsr[KVM_SPSR_EL1], SYS_SPSR);
}

diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index e21fdd93027a..ebfdfc27b2bd 100644
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -64,7 +64,7 @@ static void enter_exception64(struct kvm_vcpu *vcpu, unsigned long target_mode,
case PSR_MODE_EL1h:
vbar = vcpu_read_sys_reg(vcpu, VBAR_EL1);
sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
- vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
+ vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL1);
break;
default:
/* Don't do that */
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index baf5ce9225ce..6657b83c0647 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -94,6 +94,7 @@ static bool __vcpu_read_sys_reg_from_cpu(int reg, u64 *val)
case TPIDR_EL1: *val = read_sysreg_s(SYS_TPIDR_EL1); break;
case AMAIR_EL1: *val = read_sysreg_s(SYS_AMAIR_EL12); break;
case CNTKCTL_EL1: *val = read_sysreg_s(SYS_CNTKCTL_EL12); break;
+ case ELR_EL1: *val = read_sysreg_s(SYS_ELR_EL12); break;
case PAR_EL1: *val = read_sysreg_s(SYS_PAR_EL1); break;
case DACR32_EL2: *val = read_sysreg_s(SYS_DACR32_EL2); break;
case IFSR32_EL2: *val = read_sysreg_s(SYS_IFSR32_EL2); break;
@@ -133,6 +134,7 @@ static bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
case TPIDR_EL1: write_sysreg_s(val, SYS_TPIDR_EL1); break;
case AMAIR_EL1: write_sysreg_s(val, SYS_AMAIR_EL12); break;
case CNTKCTL_EL1: write_sysreg_s(val, SYS_CNTKCTL_EL12); break;
+ case ELR_EL1: write_sysreg_s(val, SYS_ELR_EL12); break;
case PAR_EL1: write_sysreg_s(val, SYS_PAR_EL1); break;
case DACR32_EL2: write_sysreg_s(val, SYS_DACR32_EL2); break;
case IFSR32_EL2: write_sysreg_s(val, SYS_IFSR32_EL2); break;
--
2.27.0