Thread (28 messages) 28 messages, 4 authors, 2023-04-11
STALE1177d

[PATCH 05/10] arm64: mops: don't disable host MOPS instructions from EL2

From: Kristina Martsenko <hidden>
Date: 2023-02-16 16:02:00
Also in: kvmarm, lkml
Subsystem: arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers: Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds

To allow nVHE host EL0 and EL1 to use FEAT_MOPS instructions, configure
EL2 to not cause these instructions to be treated as UNDEFINED. A VHE
host is unaffected by this control.

Signed-off-by: Kristina Martsenko <redacted>
---
 arch/arm64/include/asm/kvm_arm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index cd8dd307aaba..f37d37957322 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -94,7 +94,7 @@
 #define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
 
 #define HCRX_GUEST_FLAGS 0
-#define HCRX_HOST_FLAGS (HCRX_EL2_SMPME)
+#define HCRX_HOST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_MSCEn)
 
 /* TCR_EL2 Registers bits */
 #define TCR_EL2_RES1		((1U << 31) | (1 << 23))
-- 
2.25.1


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