xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Förgrening 0
Kod Ärenden Pull-förfrågningar Actions Packages Projekt Släpp Wiki Aktiviteter

KVM: PPC: Book3S PR: Fix MSR setting when delivering interrupts

Bläddra i källkod 
This makes sure that MSR "partial-function" bits are not transferred
to SRR1 when delivering an interrupt.  This was causing failures in
guests running kernels that include commit f3d96e698e ("powerpc/mm:
Overhaul handling of bad page faults", 2017-07-19), which added code
to check bits of SRR1 on instruction storage interrupts (ISIs) that
indicate a bad page fault.  The symptom was that a guest user program
that handled a signal and attempted to return from the signal handler
would get a SIGBUS signal and die.

The code that generated ISIs and some other interrupts would
previously set bits in the guest MSR to indicate the interrupt status
and then call kvmppc_book3s_queue_irqprio().  This technique no
longer works now that kvmppc_inject_interrupt() is masking off those
bits.  Instead we make kvmppc_core_queue_data_storage() and
kvmppc_core_queue_inst_storage() call kvmppc_inject_interrupt()
directly, and make sure that all the places that generate ISIs or
DSIs call kvmppc_core_queue_{data,inst}_storage instead of
kvmppc_book3s_queue_irqprio().

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2018-06-07 18:04:37 +10:00
förälder b71dc519a9
incheckning 916ccadccd
2 ändrade filer med 22 tillägg och 33 borttagningar
Download Patch File Download Diff File Expand all files Collapse all files

42
arch/powerpc/kvm/book3s_pr.c
Visa fil

@@ -728,24 +728,20 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
pte.may_execute = !data;
}
if (page_found == -ENOENT) {
/* Page not found in guest PTE entries */
u64 ssrr1 = vcpu->arch.shadow_srr1;
u64 msr = kvmppc_get_msr(vcpu);
kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
kvmppc_set_dsisr(vcpu, vcpu->arch.fault_dsisr);
kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
kvmppc_book3s_queue_irqprio(vcpu, vec);
} else if (page_found == -EPERM) {
/* Storage protection */
u32 dsisr = vcpu->arch.fault_dsisr;
u64 ssrr1 = vcpu->arch.shadow_srr1;
u64 msr = kvmppc_get_msr(vcpu);
kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
dsisr = (dsisr & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
kvmppc_set_dsisr(vcpu, dsisr);
kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
kvmppc_book3s_queue_irqprio(vcpu, vec);
if (page_found == -ENOENT || page_found == -EPERM) {
/* Page not found in guest PTE entries, or protection fault */
u64 flags;
if (page_found == -EPERM)
flags = DSISR_PROTFAULT;
else
flags = DSISR_NOHPTE;
if (data) {
flags |= vcpu->arch.fault_dsisr & DSISR_ISSTORE;
kvmppc_core_queue_data_storage(vcpu, eaddr, flags);
} else {
kvmppc_core_queue_inst_storage(vcpu, flags);
}
} else if (page_found == -EINVAL) {
/* Page not found in guest SLB */
kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
@@ -1178,10 +1174,8 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
r = RESUME_GUEST;
} else {
u64 msr = kvmppc_get_msr(vcpu);
msr |= shadow_srr1 & 0x58000000;
kvmppc_set_msr_fast(vcpu, msr);
kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
kvmppc_core_queue_inst_storage(vcpu,
shadow_srr1 & 0x58000000);
r = RESUME_GUEST;
}
break;
@@ -1220,9 +1214,7 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
} else {
kvmppc_set_dar(vcpu, dar);
kvmppc_set_dsisr(vcpu, fault_dsisr);
kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
kvmppc_core_queue_data_storage(vcpu, dar, fault_dsisr);
r = RESUME_GUEST;
}
break;