Fuad Tabba 016f1f7cca KVM: arm64: Hide S1POE from guests when not supported by the host ...

[ Upstream commit f66857bafd ]

When CONFIG_ARM64_POE is disabled, KVM does not save/restore POR_EL1.
However, ID_AA64MMFR3_EL1 sanitisation currently exposes the feature to
guests whenever the hardware supports it, ignoring the host kernel
configuration.

If a guest detects this feature and attempts to use it, the host will
fail to context-switch POR_EL1, potentially leading to state corruption.

Fix this by masking ID_AA64MMFR3_EL1.S1POE in the sanitised system
registers, preventing KVM from advertising the feature when the host
does not support it (i.e. system_supports_poe() is false).

Fixes: 70ed723829 ("KVM: arm64: Sanitise ID_AA64MMFR3_EL1")
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260213143815.1732675-2-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-03-13 17:20:16 +01:00

..

hyp

KVM: arm64: Initialize SCTLR_EL1 in __kvm_hyp_init_cpu()

2026-01-08 10:14:27 +01:00

vgic

KVM: arm64: vgic-its: Clear DTE when MAPD unmaps a device

2024-12-05 14:02:45 +01:00

.gitignore

…

arch_timer.c

KVM: arm64: timer: Always evaluate the need for a soft timer

2025-02-17 10:05:05 +01:00

arm.c

KVM: arm64: Tear down vGIC on failed vCPU creation

2025-04-20 10:15:34 +02:00

at.c

…

debug.c

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emulate-nested.c

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fpsimd.c

KVM: arm64: Eagerly switch ZCR_EL{1,2}

2025-03-28 22:03:32 +01:00

guest.c

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handle_exit.c

…

hypercalls.c

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inject_fault.c

…

Kconfig

…

Makefile

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mmio.c

KVM: arm64: Don't retire aborted MMIO instruction

2024-12-05 14:02:44 +01:00

mmu.c

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nested.c

…

pauth.c

…

pkvm.c

…

pmu-emul.c

KVM: arm64: Ignore PMCNTENSET_EL0 while checking for overflow status

2024-12-05 14:02:44 +01:00

pmu.c

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psci.c

…

ptdump.c

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pvtime.c

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reset.c

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stacktrace.c

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sys_regs.c

KVM: arm64: Hide S1POE from guests when not supported by the host

2026-03-13 17:20:16 +01:00

sys_regs.h

…

trace_arm.h

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trace_handle_exit.h

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trace.h

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trng.c

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va_layout.c

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vgic-sys-reg-v3.c

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vmid.c

KVM: arm64: Ensure a VMID is allocated before programming VTTBR_EL2

2025-03-07 18:25:37 +01:00