From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Marc Zyngier <marc.zyngier@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH 4.9 14/21] arm64: move !VHE work to end of el2_setup
Date: Mon, 10 Jan 2022 08:23:01 +0100 [thread overview]
Message-ID: <20220110071813.280605016@linuxfoundation.org> (raw)
In-Reply-To: <20220110071812.806606886@linuxfoundation.org>
From: Mark Rutland <mark.rutland@arm.com>
commit d61c97a7773d0848b4bf5c4697855c7ce117362c upstream.
We only need to initialise sctlr_el1 if we're installing an EL2 stub, so
we may as well defer this until we're doing so. Similarly, we can defer
intialising CPTR_EL2 until then, as we do not access any trapped
functionality as part of el2_setup.
This patch modified el2_setup accordingly, allowing us to remove a
branch and simplify the code flow.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/kernel/head.S | 37 +++++++++++++++++--------------------
1 file changed, 17 insertions(+), 20 deletions(-)
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -553,26 +553,6 @@ set_hcr:
msr vpidr_el2, x0
msr vmpidr_el2, x1
- /*
- * When VHE is not in use, early init of EL2 and EL1 needs to be
- * done here.
- * When VHE _is_ in use, EL1 will not be used in the host and
- * requires no configuration, and all non-hyp-specific EL2 setup
- * will be done via the _EL1 system register aliases in __cpu_setup.
- */
- cbnz x2, 1f
-
- /* sctlr_el1 */
- mov x0, #0x0800 // Set/clear RES{1,0} bits
-CPU_BE( movk x0, #0x33d0, lsl #16 ) // Set EE and E0E on BE systems
-CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems
- msr sctlr_el1, x0
-
- /* Coprocessor traps. */
- mov x0, #0x33ff
- msr cptr_el2, x0 // Disable copro. traps to EL2
-1:
-
#ifdef CONFIG_COMPAT
msr hstr_el2, xzr // Disable CP15 traps to EL2
#endif
@@ -598,6 +578,23 @@ CPU_LE( movk x0, #0x30d0, lsl #16 ) // C
ret
install_el2_stub:
+ /*
+ * When VHE is not in use, early init of EL2 and EL1 needs to be
+ * done here.
+ * When VHE _is_ in use, EL1 will not be used in the host and
+ * requires no configuration, and all non-hyp-specific EL2 setup
+ * will be done via the _EL1 system register aliases in __cpu_setup.
+ */
+ /* sctlr_el1 */
+ mov x0, #0x0800 // Set/clear RES{1,0} bits
+CPU_BE( movk x0, #0x33d0, lsl #16 ) // Set EE and E0E on BE systems
+CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems
+ msr sctlr_el1, x0
+
+ /* Coprocessor traps. */
+ mov x0, #0x33ff
+ msr cptr_el2, x0 // Disable copro. traps to EL2
+
/* Hypervisor stub */
adrp x0, __hyp_stub_vectors
add x0, x0, #:lo12:__hyp_stub_vectors
next prev parent reply other threads:[~2022-01-10 7:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-10 7:22 [PATCH 4.9 00/21] 4.9.297-rc1 review Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 01/21] Bluetooth: btusb: Apply QCA Rome patches for some ATH3012 models Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 02/21] tracing: Fix check for trace_percpu_buffer validity in get_trace_buf() Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 03/21] tracing: Tag trace_percpu_buffer as a percpu pointer Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 04/21] virtio_pci: Support surprise removal of virtio pci device Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 05/21] ieee802154: atusb: fix uninit value in atusb_set_extended_addr Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 06/21] mac80211: initialize variable have_higher_than_11mbit Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 07/21] i40e: Fix incorrect netdevs real number of RX/TX queues Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 08/21] sch_qfq: prevent shift-out-of-bounds in qfq_init_qdisc Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 09/21] xfs: map unwritten blocks in XFS_IOC_{ALLOC,FREE}SP just like fallocate Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 10/21] rndis_host: support Hytera digital radios Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 11/21] bug: split BUILD_BUG stuff out into <linux/build_bug.h> Greg Kroah-Hartman
2022-01-10 7:22 ` [PATCH 4.9 12/21] arm64: Remove a redundancy in sysreg.h Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 13/21] arm64: reduce el2_setup branching Greg Kroah-Hartman
2022-01-10 7:23 ` Greg Kroah-Hartman [this message]
2022-01-10 7:23 ` [PATCH 4.9 15/21] arm64: sysreg: Move to use definitions for all the SCTLR bits Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 16/21] phonet: refcount leak in pep_sock_accep Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 17/21] scsi: libiscsi: Fix UAF in iscsi_conn_get_param()/iscsi_conn_teardown() Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 18/21] ip6_vti: initialize __ip6_tnl_parm struct in vti6_siocdevprivate Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 19/21] net: udp: fix alignment problem in udp4_seq_show() Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 20/21] mISDN: change function names to avoid conflicts Greg Kroah-Hartman
2022-01-10 7:23 ` [PATCH 4.9 21/21] power: reset: ltc2952: Fix use of floating point literals Greg Kroah-Hartman
2022-01-10 11:49 ` [PATCH 4.9 00/21] 4.9.297-rc1 review Jon Hunter
2022-01-10 18:58 ` Florian Fainelli
2022-01-10 23:01 ` Shuah Khan
2022-01-10 23:48 ` Guenter Roeck
2022-01-11 8:39 ` Naresh Kamboju
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