[PATCH v5 33/37] KVM: arm64: Add POE save/restore for AT emulation fast-path

Marc Zyngier
2024-10-23T14:53:58Z

Just like the other extensions affecting address translation,
we must save/restore POE so that an out-of-context translation
context can be restored and used with the AT instructions.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/at.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c
index de7109111e404..ef1643faedeb4 100644
--- a/arch/arm64/kvm/at.c
+++ b/arch/arm64/kvm/at.c
@@ -440,6 +440,8 @@ struct mmu_config {
u64 tcr2;
u64 pir;
u64 pire0;
+ u64 por_el0;
+ u64 por_el1;
u64 sctlr;
u64 vttbr;
u64 vtcr;
@@ -458,6 +460,10 @@ static void __mmu_config_save(struct mmu_config *config)
config->pir = read_sysreg_el1(SYS_PIR);
config->pire0 = read_sysreg_el1(SYS_PIRE0);
}
+ if (system_supports_poe()) {
+ config->por_el1 = read_sysreg_el1(SYS_POR);
+ config->por_el0 = read_sysreg_s(SYS_POR_EL0);
+ }
}
config->sctlr = read_sysreg_el1(SYS_SCTLR);
config->vttbr = read_sysreg(vttbr_el2);
@@ -485,6 +491,10 @@ static void __mmu_config_restore(struct mmu_config *config)
write_sysreg_el1(config->pir, SYS_PIR);
write_sysreg_el1(config->pire0, SYS_PIRE0);
}
+ if (system_supports_poe()) {
+ write_sysreg_el1(config->por_el1, SYS_POR);
+ write_sysreg_s(config->por_el0, SYS_POR_EL0);
+ }
}
write_sysreg_el1(config->sctlr, SYS_SCTLR);
write_sysreg(config->vttbr, vttbr_el2);
@@ -1105,6 +1115,10 @@ static u64 __kvm_at_s1e01_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr)
write_sysreg_el1(vcpu_read_sys_reg(vcpu, PIR_EL1), SYS_PIR);
write_sysreg_el1(vcpu_read_sys_reg(vcpu, PIRE0_EL1), SYS_PIRE0);
}
+ if (kvm_has_s1poe(vcpu->kvm)) {
+ write_sysreg_el1(vcpu_read_sys_reg(vcpu, POR_EL1), SYS_POR);
+ write_sysreg_s(vcpu_read_sys_reg(vcpu, POR_EL0), SYS_POR_EL0);
+ }
}
write_sysreg_el1(vcpu_read_sys_reg(vcpu, SCTLR_EL1), SYS_SCTLR);
__load_stage2(mmu, mmu->arch);
--
2.39.2