From: Shaoqin Huang <shahuang@redhat.com>
To: Oliver Upton <oliver.upton@linux.dev>,
Marc Zyngier <maz@kernel.org>,
kvmarm@lists.linux.dev
Cc: Shaoqin Huang <shahuang@redhat.com>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] KVM: arm64: Allow userspace to change ID_AA64PFR1_EL1
Date: Tue, 18 Jun 2024 02:38:06 -0400 [thread overview]
Message-ID: <20240618063808.1040085-2-shahuang@redhat.com> (raw)
In-Reply-To: <20240618063808.1040085-1-shahuang@redhat.com>
Allow userspace to change the guest-visible value of the register with
some severe limitation:
- No changes to features not virtualized by KVM (MPAM_frac, RAS_frac)
---
arch/arm64/kvm/sys_regs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 22b45a15d068..bead81867bce 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2306,7 +2306,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_AA64PFR0_EL1_GIC |
ID_AA64PFR0_EL1_AdvSIMD |
ID_AA64PFR0_EL1_FP), },
- ID_SANITISED(ID_AA64PFR1_EL1),
+ ID_WRITABLE(ID_AA64PFR1_EL1, ~(ID_AA64PFR1_EL1_RAS_frac |
+ ID_AA64PFR1_EL1_MPAM_frac)),
ID_UNALLOCATED(4,2),
ID_UNALLOCATED(4,3),
ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
--
2.40.1
next prev parent reply other threads:[~2024-06-18 6:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-18 6:38 [PATCH v2 0/2] " Shaoqin Huang
2024-06-18 6:38 ` Shaoqin Huang [this message]
2024-06-18 7:39 ` [PATCH v2 1/2] KVM: arm64: " Marc Zyngier
2024-06-19 3:14 ` Shaoqin Huang
2024-06-21 6:17 ` Shaoqin Huang
2024-06-21 7:53 ` Marc Zyngier
2024-06-26 7:33 ` Shaoqin Huang
2024-06-26 9:01 ` Shaoqin Huang
2024-06-18 6:38 ` [PATCH v2 2/2] KVM: selftests: aarch64: Add writable test for ID_AA64PFR1_EL1 Shaoqin Huang
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