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| author | Marc Zyngier <maz@kernel.org> | 2024-02-14 16:18:16 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2024-02-19 20:13:01 +0300 |
| commit | cc5f84fbb008ff0904e0a8c0fb207cee2eb99bc9 (patch) | |
| tree | 42c8c9ccaf40dfc3f41dabaa1c7c82860321beb0 /arch/arm64/kvm/emulate-nested.c | |
| parent | 19f3e7ea29f8f485f06b47f7c38f9e9e81013ada (diff) | |
| download | linux-cc5f84fbb008ff0904e0a8c0fb207cee2eb99bc9.tar.xz | |
KVM: arm64: Use the xarray as the primary sysreg/sysinsn walker
Since we always start sysreg/sysinsn handling by searching the
xarray, use it as the source of the index in the correct sys_reg_desc
array.
This allows some cleanup, such as moving the handling of unknown
sysregs in a single location.
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240214131827.2856277-16-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm/emulate-nested.c')
| -rw-r--r-- | arch/arm64/kvm/emulate-nested.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c index ddf760b4dda5..5aeaa688755f 100644 --- a/arch/arm64/kvm/emulate-nested.c +++ b/arch/arm64/kvm/emulate-nested.c @@ -2007,7 +2007,7 @@ static bool check_fgt_bit(struct kvm *kvm, bool is_read, return !(kvm_get_sysreg_res0(kvm, sr) & BIT(tc.bit)); } -bool __check_nv_sr_forward(struct kvm_vcpu *vcpu) +bool __check_nv_sr_forward(struct kvm_vcpu *vcpu, int *sr_index) { union trap_config tc; enum trap_behaviour b; @@ -2015,9 +2015,6 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu) u32 sysreg; u64 esr, val; - if (!vcpu_has_nv(vcpu) || is_hyp_ctxt(vcpu)) - return false; - esr = kvm_vcpu_get_esr(vcpu); sysreg = esr_sys64_to_sysreg(esr); is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ; @@ -2028,13 +2025,16 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu) * A value of 0 for the whole entry means that we know nothing * for this sysreg, and that it cannot be re-injected into the * nested hypervisor. In this situation, let's cut it short. - * - * Note that ultimately, we could also make use of the xarray - * to store the index of the sysreg in the local descriptor - * array, avoiding another search... Hint, hint... */ if (!tc.val) - return false; + goto local; + + /* + * If we're not nesting, immediately return to the caller, with the + * sysreg index, should we have it. + */ + if (!vcpu_has_nv(vcpu) || is_hyp_ctxt(vcpu)) + goto local; switch ((enum fgt_group_id)tc.fgt) { case __NO_FGT_GROUP__: @@ -2076,7 +2076,7 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu) case __NR_FGT_GROUP_IDS__: /* Something is really wrong, bail out */ WARN_ONCE(1, "__NR_FGT_GROUP_IDS__"); - return false; + goto local; } if (tc.fgt != __NO_FGT_GROUP__ && check_fgt_bit(vcpu->kvm, is_read, @@ -2089,6 +2089,26 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu) ((b & BEHAVE_FORWARD_WRITE) && !is_read)) goto inject; +local: + if (!tc.sri) { + struct sys_reg_params params; + + params = esr_sys64_to_params(esr); + + /* + * Check for the IMPDEF range, as per DDI0487 J.a, + * D18.3.2 Reserved encodings for IMPLEMENTATION + * DEFINED registers. + */ + if (!(params.Op0 == 3 && (params.CRn & 0b1011) == 0b1011)) + print_sys_reg_msg(¶ms, + "Unsupported guest access at: %lx\n", + *vcpu_pc(vcpu)); + kvm_inject_undefined(vcpu); + return true; + } + + *sr_index = tc.sri - 1; return false; inject: |