When a guest hypervisor running virtual EL2 in EL1 executes an ERET
instruction, we will have set HCR_EL2.NV which traps ERET to EL2, so
that we can emulate the exception return in software.
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230209175820.1939006-12-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
(((e) & ESR_ELx_SYS64_ISS_OP2_MASK) >> \
ESR_ELx_SYS64_ISS_OP2_SHIFT))
+/* ISS field definitions for ERET/ERETAA/ERETAB trapping */
+#define ESR_ELx_ERET_ISS_ERET 0x2
+#define ESR_ELx_ERET_ISS_ERETA 0x1
+
/*
* ISS field definitions for floating-point exception traps
* (FP_EXC_32/FP_EXC_64).
ECN(SP_ALIGN), ECN(FP_EXC32), ECN(FP_EXC64), ECN(SERROR), \
ECN(BREAKPT_LOW), ECN(BREAKPT_CUR), ECN(SOFTSTP_LOW), \
ECN(SOFTSTP_CUR), ECN(WATCHPT_LOW), ECN(WATCHPT_CUR), \
- ECN(BKPT32), ECN(VECTOR32), ECN(BRK64)
+ ECN(BKPT32), ECN(VECTOR32), ECN(BRK64), ECN(ERET)
#define CPACR_EL1_TTA (1 << 28)
#define CPACR_EL1_DEFAULT (CPACR_EL1_FPEN_EL0EN | CPACR_EL1_FPEN_EL1EN |\
return 1;
}
+static int kvm_handle_eret(struct kvm_vcpu *vcpu)
+{
+ if (kvm_vcpu_get_esr(vcpu) & ESR_ELx_ERET_ISS_ERET)
+ return kvm_handle_ptrauth(vcpu);
+
+ kvm_emulate_nested_eret(vcpu);
+ return 1;
+}
+
static exit_handle_fn arm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
[ESR_ELx_EC_WFx] = kvm_handle_wfx,
[ESR_ELx_EC_SMC64] = handle_smc,
[ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
[ESR_ELx_EC_SVE] = handle_sve,
+ [ESR_ELx_EC_ERET] = kvm_handle_eret,
[ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
[ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,