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KVM: arm64: Move existing feature disabling over to FGU infrastructure

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We already trap a bunch of existing features for the purpose of
disabling them (MAIR2, POR, ACCDATA, SME...).

Let's move them over to our brand new FGU infrastructure.

Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240214131827.2856277-20-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2024-02-14 13:18:20 +00:00 committed by Oliver Upton
parent f5a5a406b4
commit c5bac1ef7d
4 changed files with 36 additions and 14 deletions
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4
arch/arm64/include/asm/kvm_host.h
View File

@ -297,6 +297,8 @@ struct kvm_arch {
#define KVM_ARCH_FLAG_TIMER_PPIS_IMMUTABLE 6
/* Initial ID reg values loaded */
#define KVM_ARCH_FLAG_ID_REGS_INITIALIZED 7
/* Fine-Grained UNDEF initialised */
#define KVM_ARCH_FLAG_FGU_INITIALIZED 8
unsigned long flags;
/* VM-wide vCPU feature set */
@ -1107,6 +1109,8 @@ int __init populate_nv_trap_config(void);
bool lock_all_vcpus(struct kvm *kvm);
void unlock_all_vcpus(struct kvm *kvm);
void kvm_init_sysreg(struct kvm_vcpu *);
/* MMIO helpers */
void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len);

6
arch/arm64/kvm/arm.c
View File

@ -675,6 +675,12 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
return ret;
}
/*
* This needs to happen after NV has imposed its own restrictions on
* the feature set
*/
kvm_init_sysreg(vcpu);
ret = kvm_timer_enable(vcpu);
if (ret)
return ret;

17
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@ -157,7 +157,7 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
u64 r_clr = 0, w_clr = 0, r_set = 0, w_set = 0, tmp;
u64 r_clr = 0, w_clr = 0, r_set = 0, w_set = 0;
u64 r_val, w_val;
CHECK_FGT_MASKS(HFGRTR_EL2);
@ -174,13 +174,6 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
ctxt_sys_reg(hctxt, HFGRTR_EL2) = read_sysreg_s(SYS_HFGRTR_EL2);
ctxt_sys_reg(hctxt, HFGWTR_EL2) = read_sysreg_s(SYS_HFGWTR_EL2);
if (cpus_have_final_cap(ARM64_SME)) {
tmp = HFGxTR_EL2_nSMPRI_EL1_MASK | HFGxTR_EL2_nTPIDR2_EL0_MASK;
r_clr |= tmp;
w_clr |= tmp;
}
/*
* Trap guest writes to TCR_EL1 to prevent it from enabling HA or HD.
*/
@ -195,15 +188,11 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
compute_undef_clr_set(vcpu, kvm, HFGRTR_EL2, r_clr, r_set);
compute_undef_clr_set(vcpu, kvm, HFGWTR_EL2, w_clr, w_set);
/* The default to trap everything not handled or supported in KVM. */
tmp = HFGxTR_EL2_nAMAIR2_EL1 | HFGxTR_EL2_nMAIR2_EL1 | HFGxTR_EL2_nS2POR_EL1 |
HFGxTR_EL2_nPOR_EL1 | HFGxTR_EL2_nPOR_EL0 | HFGxTR_EL2_nACCDATA_EL1;
r_val = __HFGRTR_EL2_nMASK & ~tmp;
r_val = __HFGRTR_EL2_nMASK;
r_val |= r_set;
r_val &= ~r_clr;
w_val = __HFGWTR_EL2_nMASK & ~tmp;
w_val = __HFGWTR_EL2_nMASK;
w_val |= w_set;
w_val &= ~w_clr;

23
arch/arm64/kvm/sys_regs.c
View File

@ -3942,6 +3942,29 @@ int kvm_vm_ioctl_get_reg_writable_masks(struct kvm *kvm, struct reg_mask_range *
return 0;
}
void kvm_init_sysreg(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
mutex_lock(&kvm->arch.config_lock);
if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags))
goto out;
kvm->arch.fgu[HFGxTR_GROUP] = (HFGxTR_EL2_nAMAIR2_EL1 |
HFGxTR_EL2_nMAIR2_EL1 |
HFGxTR_EL2_nS2POR_EL1 |
HFGxTR_EL2_nPOR_EL1 |
HFGxTR_EL2_nPOR_EL0 |
HFGxTR_EL2_nACCDATA_EL1 |
HFGxTR_EL2_nSMPRI_EL1_MASK |
HFGxTR_EL2_nTPIDR2_EL0_MASK);
set_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags);
out:
mutex_unlock(&kvm->arch.config_lock);
}
int __init kvm_sys_reg_table_init(void)
{
struct sys_reg_params params;