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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Joey Gouly <joey.gouly@arm.com>
Subject: [PATCH 2/2] KVM: arm64: nv: Expose BTI and CSV_frac to a guest hypervisor
Date: Tue, 28 May 2024 11:06:32 +0100	[thread overview]
Message-ID: <20240528100632.1831995-3-maz@kernel.org> (raw)
In-Reply-To: <20240528100632.1831995-1-maz@kernel.org>

Now that we expose PAC to NV guests, we can also expose BTI (as
the two as joined at the hip, due to some of the PAC instructions
being landing pads).

While we're at it, also propagate CSV_frac, which requires no
particular emulation.

Fixes: f4f6a95bac49 ("KVM: arm64: nv: Advertise support for PAuth")
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/nested.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 6813c7c7f00a..bae8536cbf00 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -58,8 +58,10 @@ static u64 limit_nv_id_reg(u32 id, u64 val)
 		break;
 
 	case SYS_ID_AA64PFR1_EL1:
-		/* Only support SSBS */
-		val &= NV_FTR(PFR1, SSBS);
+		/* Only support BTI, SSBS, CSV2_frac */
+		val &= (NV_FTR(PFR1, BT)	|
+			NV_FTR(PFR1, SSBS)	|
+			NV_FTR(PFR1, CSV2_frac));
 		break;
 
 	case SYS_ID_AA64MMFR0_EL1:
-- 
2.39.2


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  parent reply	other threads:[~2024-05-28 10:07 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-28 10:06 [PATCH 0/2] KVM/arm64 fixes for NV PAC support Marc Zyngier
2024-05-28 10:06 ` [PATCH 1/2] KVM: arm64: nv: Fix relative priorities of exceptions generated by ERETAx Marc Zyngier
2024-05-29 14:27   ` Joey Gouly
2024-05-29 14:44     ` Marc Zyngier
2024-05-28 10:06 ` Marc Zyngier [this message]
2024-05-30  7:58 ` [PATCH 0/2] KVM/arm64 fixes for NV PAC support Oliver Upton
2024-05-30 16:37 ` Marc Zyngier

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