xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: arm/arm64: Fix guest external abort matching

Browse Source 
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>
This commit is contained in:
James Morse
2017-07-18 13:37:41 +01:00
committed by Christoffer Dall
parent 712b12d724
commit bb428921b7
4 changed files with 49 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
virt/kvm/arm/mmu.c
View File

@@ -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),