diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2021-02-21 13:14:48 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2021-02-21 13:14:48 +0000 |
| commit | 65234032c92181cb58c9cfd7c7dda13077a63836 (patch) | |
| tree | 0d0ec1b70efddf6f6a09e3c5e369ce0c38e18a09 /sys | |
| parent | f85deff41e2f1b07e5edb89168814eb0f9a24a60 (diff) | |
One CPUs that implement the VHE extension and have the E2H bit set, keep
running the kernel in EL2.
ok patrick@
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/arm64/arm64/locore.S | 15 | ||||
| -rw-r--r-- | sys/arch/arm64/include/hypervisor.h | 3 |
2 files changed, 12 insertions, 6 deletions
diff --git a/sys/arch/arm64/arm64/locore.S b/sys/arch/arm64/arm64/locore.S index 2e646b29032..d4a8b3d4cd3 100644 --- a/sys/arch/arm64/arm64/locore.S +++ b/sys/arch/arm64/arm64/locore.S @@ -1,4 +1,4 @@ -/* $OpenBSD: locore.S,v 1.33 2021/02/16 12:33:22 kettenis Exp $ */ +/* $OpenBSD: locore.S,v 1.34 2021/02/21 13:14:47 kettenis Exp $ */ /*- * Copyright (c) 2012-2014 Andrew Turner * All rights reserved. @@ -47,10 +47,15 @@ drop_to_el1: mrs x1, CurrentEL lsr x1, x1, #2 cmp x1, #0x2 - b.eq 1f + b.eq 2f +1: RETGUARD_CHECK(drop_to_el1, x15) ret -1: +2: + /* Check for EL2 Host mode */ + mrs x2, hcr_el2 + tbnz x2, #34, 1b /* HCR_E2H */ + /* Configure the Hypervisor */ mov x2, #(HCR_RW) msr hcr_el2, x2 @@ -96,13 +101,13 @@ drop_to_el1: ubfx x2, x2, #ID_AA64PFR0_GIC_SHIFT, #ID_AA64PFR0_GIC_BITS /* GIC[3:0] == 0001 - GIC CPU interface via special regs. supported */ cmp x2, #(ID_AA64PFR0_GIC_CPUIF_EN >> ID_AA64PFR0_GIC_SHIFT) - b.ne 2f + b.ne 3f mrs x2, icc_sre_el2 orr x2, x2, #ICC_SRE_EL2_EN /* Enable access from insecure EL1 */ orr x2, x2, #ICC_SRE_EL2_SRE /* Enable system registers */ msr icc_sre_el2, x2 -2: +3: /* Set the address to return to our return address */ msr elr_el2, x30 diff --git a/sys/arch/arm64/include/hypervisor.h b/sys/arch/arm64/include/hypervisor.h index 8a7ee6ce4e3..0b91a2afc84 100644 --- a/sys/arch/arm64/include/hypervisor.h +++ b/sys/arch/arm64/include/hypervisor.h @@ -1,4 +1,4 @@ -/* $OpenBSD: hypervisor.h,v 1.2 2016/12/18 14:40:25 patrick Exp $ */ +/* $OpenBSD: hypervisor.h,v 1.3 2021/02/21 13:14:47 kettenis Exp $ */ /*- * Copyright (c) 2013, 2014 Andrew Turner * All rights reserved. @@ -81,6 +81,7 @@ #define HCR_RW 0x0000000080000000 #define HCR_CD 0x0000000100000000 #define HCR_ID 0x0000000200000000 +#define HCR_E2H 0x0000000400000000 #endif |