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[v5,25/28] KVM: arm64: Expose SME to nested guests

Message ID 20250417-kvm-arm64-sme-v5-25-f469a2d5f574@kernel.org (mailing list archive)
State New
Headers show
Series KVM: arm64: Implement support for SME | expand

Commit Message

Mark Brown April 17, 2025, 12:25 a.m. UTC 
With support for context switching SME state in place allow access to SME
in nested guests.

The SME floating point state is handled along with all the other floating
point state, SME specific floating point exceptions are directed into the
same handlers as other floating point exceptions with NV specific handling
for the vector lengths already in place.

TPIDR2_EL0 is context switched along with the other TPIDRs as part of the
main guest register context switch.

SME priority support is currently masked from all guests including nested
ones.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/kvm/nested.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 4a3fc11f7ecf..a599216ce1ce 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -841,9 +841,10 @@  u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val)
 		break;
 
 	case SYS_ID_AA64PFR1_EL1:
-		/* Only support BTI, SSBS, CSV2_frac */
+		/* Only support BTI, SSBS, SME, CSV2_frac */
 		val &= (ID_AA64PFR1_EL1_BT	|
 			ID_AA64PFR1_EL1_SSBS	|
+			ID_AA64PFR1_EL1_SME	|
 			ID_AA64PFR1_EL1_CSV2_frac);
 		break;