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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2017-06-09 12:49:56 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-15 09:45:07 +0100 |
| commit | 7b1dba1f7325629427c0e5bdf014159b229d16c8 (patch) | |
| tree | ebc647bc897765a24c1f9d7d5d4dbb98fb728f87 | |
| parent | KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access (diff) | |
| download | linux-dev-7b1dba1f7325629427c0e5bdf014159b229d16c8.tar.xz linux-dev-7b1dba1f7325629427c0e5bdf014159b229d16c8.zip | |
KVM: arm64: Log an error if trapping a write-to-read-only GICv3 access
A write-to-read-only GICv3 access should UNDEF at EL1. But since
we're in complete paranoia-land with broken CPUs, let's assume the
worse and gracefully handle the case.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 15 | ||||
| -rw-r--r-- | virt/kvm/arm/hyp/vgic-v3-sr.c | 6 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 8d51c075966d..77862881ae86 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -65,6 +65,16 @@ static bool read_from_write_only(struct kvm_vcpu *vcpu, return false; } +static bool write_to_read_only(struct kvm_vcpu *vcpu, + struct sys_reg_params *params, + const struct sys_reg_desc *r) +{ + WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n"); + print_sys_reg_instr(params); + kvm_inject_undefined(vcpu); + return false; +} + /* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */ static u32 cache_levels; @@ -954,10 +964,15 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 }, + { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only }, { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only }, + { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only }, { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only }, + { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only }, { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi }, + { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only }, { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only }, + { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only }, { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index b26ce58b012a..79e3c2d3b754 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -976,6 +976,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) switch (sysreg) { case SYS_ICC_IAR0_EL1: case SYS_ICC_IAR1_EL1: + if (unlikely(!is_read)) + return 0; fn = __vgic_v3_read_iar; break; case SYS_ICC_EOIR0_EL1: @@ -1026,6 +1028,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) break; case SYS_ICC_HPPIR0_EL1: case SYS_ICC_HPPIR1_EL1: + if (unlikely(!is_read)) + return 0; fn = __vgic_v3_read_hppir; break; case SYS_ICC_GRPEN0_EL1: @@ -1046,6 +1050,8 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu) fn = __vgic_v3_write_dir; break; case SYS_ICC_RPR_EL1: + if (unlikely(!is_read)) + return 0; fn = __vgic_v3_read_rpr; break; case SYS_ICC_CTLR_EL1: |