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authorJames Morse <james.morse@arm.com>2017-07-18 14:37:41 +0200
committerChristoffer Dall <cdall@linaro.org>2017-09-05 17:33:37 +0200
commitbb428921b777a5e36753b5d6aa0ba8d46705cc0d (patch)
treec69c07699715fa2e507419f770933adbf683a466 /virt/kvm
parentkvm: nVMX: Validate the virtual-APIC address on nested VM-entry (diff)
downloadlinux-bb428921b777a5e36753b5d6aa0ba8d46705cc0d.tar.xz
linux-bb428921b777a5e36753b5d6aa0ba8d46705cc0d.zip
KVM: arm/arm64: Fix guest external abort matching
The ARM-ARM has two bits in the ESR/HSR relevant to external aborts. A range of {I,D}FSC values (of which bit 5 is always set) and bit 9 'EA' which provides: > an IMPLEMENTATION DEFINED classification of External Aborts. This bit is in addition to the {I,D}FSC range, and has an implementation defined meaning. KVM should always ignore this bit when handling external aborts from a guest. Remove the ESR_ELx_EA definition and rewrite its helper kvm_vcpu_dabt_isextabt() to check the {I,D}FSC range. This merges kvm_vcpu_dabt_isextabt() and the recently added is_abort_sea() helper. CC: Tyler Baicar <tbaicar@codeaurora.org> Reported-by: gengdongjiu <gengdj.1984@gmail.com> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/arm/mmu.c40
1 files changed, 11 insertions, 29 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 2ea21dac0b44..b36945d49986 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1454,25 +1454,6 @@ out:
kvm_set_pfn_accessed(pfn);
}
-static bool is_abort_sea(unsigned long fault_status)
-{
- switch (fault_status) {
- case FSC_SEA:
- case FSC_SEA_TTW0:
- case FSC_SEA_TTW1:
- case FSC_SEA_TTW2:
- case FSC_SEA_TTW3:
- case FSC_SECC:
- case FSC_SECC_TTW0:
- case FSC_SECC_TTW1:
- case FSC_SECC_TTW2:
- case FSC_SECC_TTW3:
- return true;
- default:
- return false;
- }
-}
-
/**
* kvm_handle_guest_abort - handles all 2nd stage aborts
* @vcpu: the VCPU pointer
@@ -1498,20 +1479,21 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+ is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
- /*
- * The host kernel will handle the synchronous external abort. There
- * is no need to pass the error into the guest.
- */
- if (is_abort_sea(fault_status)) {
+ /* Synchronous External Abort? */
+ if (kvm_vcpu_dabt_isextabt(vcpu)) {
+ /*
+ * For RAS the host kernel may handle this abort.
+ * There is no need to pass the error into the guest.
+ */
if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
return 1;
- }
- is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
- if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
- kvm_inject_vabt(vcpu);
- return 1;
+ if (unlikely(!is_iabt)) {
+ kvm_inject_vabt(vcpu);
+ return 1;
+ }
}
trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),