[PATCH 26/59] KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting

Marc Zyngier
2019-06-21T09:40:00Z

From: Jintack Lim <jintack.lim@linaro.org>

Forward traps due to HCR_EL2.NV bit to the virtual EL2 if they are not
coming from the virtual EL2 and the virtual HCR_EL2.NV bit is set.

In addition to EL2 register accesses, setting NV bit will also make EL12
register accesses trap to EL2. To emulate this for the virtual EL2,
forword traps due to EL12 register accessses to the virtual EL2 if the
virtual HCR_EL2.NV bit is set.

This is for recursive nested virtualization.

Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
[Moved code to emulate-nested.c]
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/include/asm/kvm_arm.h | 1 +
arch/arm64/include/asm/kvm_nested.h | 2 ++
arch/arm64/kvm/emulate-nested.c | 28 ++++++++++++++++++++++++++++
arch/arm64/kvm/handle_exit.c | 6 ++++++
arch/arm64/kvm/sys_regs.c | 18 ++++++++++++++++++
5 files changed, 55 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 48e15af2bece..d21486274eeb 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -24,6 +24,7 @@

/* Hyp Configuration Register (HCR) bits */
#define HCR_FWB (UL(1) << 46)
+#define HCR_NV (UL(1) << 42)
#define HCR_API (UL(1) << 41)
#define HCR_APK (UL(1) << 40)
#define HCR_TEA (UL(1) << 37)
diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h
index 645e5e11b749..61e71d0d2151 100644
--- a/arch/arm64/include/asm/kvm_nested.h
+++ b/arch/arm64/include/asm/kvm_nested.h
@@ -11,5 +11,7 @@ static inline bool nested_virt_in_use(const struct kvm_vcpu *vcpu)
}

int handle_wfx_nested(struct kvm_vcpu *vcpu, bool is_wfe);
+extern bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit);
+extern bool forward_nv_traps(struct kvm_vcpu *vcpu);

#endif /* __ARM64_KVM_NESTED_H */
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index f829b8b04dc8..c406fd688b9f 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -24,6 +24,27 @@

#include "trace.h"

+bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit)
+{
+ bool control_bit_set;
+
+ if (!nested_virt_in_use(vcpu))
+ return false;
+
+ control_bit_set = __vcpu_sys_reg(vcpu, HCR_EL2) & control_bit;
+ if (!vcpu_mode_el2(vcpu) && control_bit_set) {
+ kvm_inject_nested_sync(vcpu, kvm_vcpu_get_hsr(vcpu));
+ return true;
+ }
+ return false;
+}
+
+bool forward_nv_traps(struct kvm_vcpu *vcpu)
+{
+ return forward_traps(vcpu, HCR_NV);
+}
+
+
/* This is borrowed from get_except_vector in inject_fault.c */
static u64 get_el2_except_vector(struct kvm_vcpu *vcpu,
enum exception_type type)
@@ -55,6 +76,13 @@ void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu)
u64 spsr, elr, mode;
bool direct_eret;

+ /*
+ * Forward this trap to the virtual EL2 if the virtual
+ * HCR_EL2.NV bit is set and this is coming from !EL2.
+ */
+ if (forward_nv_traps(vcpu))
+ return;
+
/*
* Going through the whole put/load motions is a waste of time
* if this is a VHE guest hypervisor returning to its own
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index 39602a4c1d61..7e8b1ec1d251 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -72,6 +72,12 @@ static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int ret;

+ /*
+ * Forward this trapped smc instruction to the virtual EL2.
+ */
+ if ((vcpu_read_sys_reg(vcpu, HCR_EL2) & HCR_TSC) && forward_nv_traps(vcpu))
+ return 1;
+
/*
* "If an SMC instruction executed at Non-secure EL1 is
* trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 94affa43e86c..582d62aa48b7 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -392,10 +392,19 @@ static u32 get_ccsidr(u32 csselr)
return ccsidr;
}

+static bool el12_reg(struct sys_reg_params *p)
+{
+ /* All *_EL12 registers have Op1=5. */
+ return (p->Op1 == 5);
+}
+
static bool access_rw(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
+ if (el12_reg(p) && forward_nv_traps(vcpu))
+ return false;
+
if (p->is_write)
vcpu_write_sys_reg(vcpu, p->regval, r->reg);
else
@@ -440,6 +449,9 @@ static bool access_vm_reg(struct kvm_vcpu *vcpu,
u64 val;
int reg = r->reg;

+ if (el12_reg(p) && forward_nv_traps(vcpu))
+ return false;
+
BUG_ON(!vcpu_mode_el2(vcpu) && !p->is_write);

if (!p->is_write) {
@@ -1611,6 +1623,9 @@ static bool access_elr(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
+ if (el12_reg(p) && forward_nv_traps(vcpu))
+ return false;
+
if (p->is_write)
vcpu->arch.ctxt.gp_regs.elr_el1 = p->regval;
else
@@ -1623,6 +1638,9 @@ static bool access_spsr(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
+ if (el12_reg(p) && forward_nv_traps(vcpu))
+ return false;
+
if (p->is_write)
vcpu->arch.ctxt.gp_regs.spsr[KVM_SPSR_EL1] = p->regval;
else
--
2.20.1