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KVM: arm64: pkvm: Add a generic synchronous exception injection primitive

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Similarly to the "classic" KVM code, pKVM doesn't have an "anything
goes" synchronous exception injection primitive.

Carve one out of the UNDEF injection code.

Link: https://patch.msgid.link/20260108173233.2911955-8-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-01-08 17:32:31 +00:00
parent 70a5ce4efc
commit e5d40a5a97
1 changed files with 15 additions and 7 deletions
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22
arch/arm64/kvm/hyp/nvhe/sys_regs.c
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@ -243,16 +243,15 @@ static u64 pvm_calc_id_reg(const struct kvm_vcpu *vcpu, u32 id)
} }
} }
/* static void inject_sync64(struct kvm_vcpu *vcpu, u64 esr)
* Inject an unknown/undefined exception to an AArch64 guest while most of its
* sysregs are live.
*/
static void inject_undef64(struct kvm_vcpu *vcpu)
{ {
u64 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
*vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR); *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR);
*vcpu_cpsr(vcpu) = read_sysreg_el2(SYS_SPSR); *vcpu_cpsr(vcpu) = read_sysreg_el2(SYS_SPSR);
/*
* Make sure we have the latest update to VBAR_EL1, as pKVM
* handles traps very early, before sysregs are resync'ed
*/
__vcpu_assign_sys_reg(vcpu, VBAR_EL1, read_sysreg_el1(SYS_VBAR)); __vcpu_assign_sys_reg(vcpu, VBAR_EL1, read_sysreg_el1(SYS_VBAR));
kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC); kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC);
@ -265,6 +264,15 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR); write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR);
} }
/*
* Inject an unknown/undefined exception to an AArch64 guest while most of its
* sysregs are live.
*/
static void inject_undef64(struct kvm_vcpu *vcpu)
{
inject_sync64(vcpu, (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT));
}
static u64 read_id_reg(const struct kvm_vcpu *vcpu, static u64 read_id_reg(const struct kvm_vcpu *vcpu,
struct sys_reg_desc const *r) struct sys_reg_desc const *r)
{ {