| Message ID | 20240529121251.1993135-2-ptosi@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | KVM: arm64: Add support for hypervisor kCFI | expand |
On Wed, May 29, 2024 at 01:12:07PM +0100, Pierre-Clément Tosi wrote: > When the hypervisor receives a SError or synchronous exception (EL2h) > while running with the __kvm_hyp_vector and if ELR_EL2 doesn't point to > an extable entry, it panics indirectly by overwriting ELR with the > address of a panic handler in order for the asm routine it returns to to > ERET into the handler. > > However, this clobbers ELR_EL2 for the handler itself. As a result, > hyp_panic(), when retrieving what it believes to be the PC where the > exception happened, actually ends up reading the address of the panic > handler that called it! This results in an erroneous and confusing panic > message where the source of any synchronous exception (e.g. BUG() or > kCFI) appears to be __guest_exit_panic, making it hard to locate the > actual BRK instruction. > > Therefore, store the original ELR_EL2 in the per-CPU kvm_hyp_ctxt and > point the sysreg to a routine that first restores it to its previous > value before running __guest_exit_panic. > > Fixes: 7db21530479f ("KVM: arm64: Restore hyp when panicking in guest context") > Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> > --- > arch/arm64/kernel/asm-offsets.c | 1 + > arch/arm64/kvm/hyp/entry.S | 8 ++++++++ > arch/arm64/kvm/hyp/include/hyp/switch.h | 5 +++-- > 3 files changed, 12 insertions(+), 2 deletions(-) Acked-by: Will Deacon <will@kernel.org> Will
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index 81496083c041..27de1dddb0ab 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -128,6 +128,7 @@ int main(void) DEFINE(VCPU_FAULT_DISR, offsetof(struct kvm_vcpu, arch.fault.disr_el1)); DEFINE(VCPU_HCR_EL2, offsetof(struct kvm_vcpu, arch.hcr_el2)); DEFINE(CPU_USER_PT_REGS, offsetof(struct kvm_cpu_context, regs)); + DEFINE(CPU_ELR_EL2, offsetof(struct kvm_cpu_context, sys_regs[ELR_EL2])); DEFINE(CPU_RGSR_EL1, offsetof(struct kvm_cpu_context, sys_regs[RGSR_EL1])); DEFINE(CPU_GCR_EL1, offsetof(struct kvm_cpu_context, sys_regs[GCR_EL1])); DEFINE(CPU_APIAKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APIAKEYLO_EL1])); diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S index f3aa7738b477..4433a234aa9b 100644 --- a/arch/arm64/kvm/hyp/entry.S +++ b/arch/arm64/kvm/hyp/entry.S @@ -83,6 +83,14 @@ alternative_else_nop_endif eret sb +SYM_INNER_LABEL(__guest_exit_restore_elr_and_panic, SYM_L_GLOBAL) + // x2-x29,lr: vcpu regs + // vcpu x0-x1 on the stack + + adr_this_cpu x0, kvm_hyp_ctxt, x1 + ldr x0, [x0, #CPU_ELR_EL2] + msr elr_el2, x0 + SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) // x2-x29,lr: vcpu regs // vcpu x0-x1 on the stack diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index a92566f36022..ed9a63f1f7bf 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -689,7 +689,7 @@ static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code) static inline void __kvm_unexpected_el2_exception(void) { - extern char __guest_exit_panic[]; + extern char __guest_exit_restore_elr_and_panic[]; unsigned long addr, fixup; struct kvm_exception_table_entry *entry, *end; unsigned long elr_el2 = read_sysreg(elr_el2); @@ -711,7 +711,8 @@ static inline void __kvm_unexpected_el2_exception(void) } /* Trigger a panic after restoring the hyp context. */ - write_sysreg(__guest_exit_panic, elr_el2); + this_cpu_ptr(&kvm_hyp_ctxt)->sys_regs[ELR_EL2] = elr_el2; + write_sysreg(__guest_exit_restore_elr_and_panic, elr_el2); } #endif /* __ARM64_KVM_HYP_SWITCH_H__ */
When the hypervisor receives a SError or synchronous exception (EL2h) while running with the __kvm_hyp_vector and if ELR_EL2 doesn't point to an extable entry, it panics indirectly by overwriting ELR with the address of a panic handler in order for the asm routine it returns to to ERET into the handler. However, this clobbers ELR_EL2 for the handler itself. As a result, hyp_panic(), when retrieving what it believes to be the PC where the exception happened, actually ends up reading the address of the panic handler that called it! This results in an erroneous and confusing panic message where the source of any synchronous exception (e.g. BUG() or kCFI) appears to be __guest_exit_panic, making it hard to locate the actual BRK instruction. Therefore, store the original ELR_EL2 in the per-CPU kvm_hyp_ctxt and point the sysreg to a routine that first restores it to its previous value before running __guest_exit_panic. Fixes: 7db21530479f ("KVM: arm64: Restore hyp when panicking in guest context") Signed-off-by: Pierre-Clément Tosi <ptosi@google.com> --- arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kvm/hyp/entry.S | 8 ++++++++ arch/arm64/kvm/hyp/include/hyp/switch.h | 5 +++-- 3 files changed, 12 insertions(+), 2 deletions(-)