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UPSTREAM: KVM: arm64: Fix early exit ptrauth handling

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The previous rework of the early exit code to provide an EC-based
decoding tree missed the fact that we have two trap paths for
ptrauth: the instructions (EC_PAC) and the sysregs (EC_SYS64).

Rework the handlers to call the ptrauth handling code on both
paths.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20211013120346.2926621-2-maz@kernel.org
(cherry picked from commit 8a049862c3)
Bug: 204960018
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I4c0637e413db9a5798e7739289b246553b1c1c52
This commit is contained in:
Marc Zyngier
2021-10-13 13:03:36 +01:00
committed by Will Deacon
parent e1fad7c425
commit 77146fb45c
1 changed files with 4 additions and 10 deletions
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14
arch/arm64/kvm/hyp/include/hyp/switch.h
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@@ -282,14 +282,6 @@ static inline bool handle_tx2_tvm(struct kvm_vcpu *vcpu)
static inline bool esr_is_ptrauth_trap(u32 esr)
{
u32 ec = ESR_ELx_EC(esr);
if (ec == ESR_ELx_EC_PAC)
return true;
if (ec != ESR_ELx_EC_SYS64)
return false;
switch (esr_sys64_to_sysreg(esr)) {
case SYS_APIAKEYLO_EL1:
case SYS_APIAKEYHI_EL1:
@@ -323,8 +315,7 @@ static bool kvm_hyp_handle_ptrauth(struct kvm_vcpu *vcpu, u64 *exit_code)
struct kvm_cpu_context *ctxt;
u64 val;
if (!vcpu_has_ptrauth(vcpu) ||
!esr_is_ptrauth_trap(kvm_vcpu_get_esr(vcpu)))
if (!vcpu_has_ptrauth(vcpu))
return false;
ctxt = this_cpu_ptr(&kvm_hyp_ctxt);
@@ -353,6 +344,9 @@ static bool kvm_hyp_handle_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
__vgic_v3_perform_cpuif_access(vcpu) == 1)
return true;
if (esr_is_ptrauth_trap(kvm_vcpu_get_esr(vcpu)))
return kvm_hyp_handle_ptrauth(vcpu, exit_code);
return false;
}