From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
ebiederm@xmission.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, corbet@lwn.net,
catalin.marinas@arm.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, maz@kernel.org,
james.morse@arm.com, vladimir.murzin@arm.com,
matthias.bgg@gmail.com, linux-mm@kvack.org, mark.rutland@arm.com,
steve.capper@arm.com, rfontana@redhat.com, tglx@linutronix.de,
selindag@gmail.com, tyhicks@linux.microsoft.com,
kernelfans@gmail.com, akpm@linux-foundation.org,
madvenka@linux.microsoft.com
Subject: [PATCH 12/18] arm64: kexec: relocate in EL1 mode
Date: Thu, 27 May 2021 11:05:20 -0400 [thread overview]
Message-ID: <20210527150526.271941-13-pasha.tatashin@soleen.com> (raw)
In-Reply-To: <20210527150526.271941-1-pasha.tatashin@soleen.com>
Since we are going to keep MMU enabled during relocation, we need to
keep EL1 mode throughout the relocation.
Keep EL1 enabled, and switch EL2 only before enterying the new world.
Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
---
arch/arm64/kernel/cpu-reset.h | 3 +--
arch/arm64/kernel/machine_kexec.c | 4 ++--
arch/arm64/kernel/relocate_kernel.S | 13 +++++++++++--
3 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kernel/cpu-reset.h b/arch/arm64/kernel/cpu-reset.h
index 48d0ed48c147..296abbac7192 100644
--- a/arch/arm64/kernel/cpu-reset.h
+++ b/arch/arm64/kernel/cpu-reset.h
@@ -20,11 +20,10 @@ static inline void __noreturn __nocfi cpu_soft_restart(unsigned long entry,
{
typeof(__cpu_soft_restart) *restart;
- unsigned long el2_switch = is_hyp_callable();
restart = (void *)__pa_symbol(function_nocfi(__cpu_soft_restart));
cpu_install_idmap();
- restart(el2_switch, entry, arg0, arg1, arg2);
+ restart(0, entry, arg0, arg1, arg2);
unreachable();
}
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index 9f74791cb1d0..c9993f029262 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -231,8 +231,8 @@ void machine_kexec(struct kimage *kimage)
} else {
if (is_hyp_callable())
__hyp_set_vectors(kimage->arch.el2_vectors);
- cpu_soft_restart(kimage->arch.kern_reloc, virt_to_phys(kimage),
- 0, 0);
+ cpu_soft_restart(kimage->arch.kern_reloc,
+ virt_to_phys(kimage), 0, 0);
}
BUG(); /* Should never get here. */
diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S
index 36b4496524c3..df023b82544b 100644
--- a/arch/arm64/kernel/relocate_kernel.S
+++ b/arch/arm64/kernel/relocate_kernel.S
@@ -13,6 +13,7 @@
#include <asm/kexec.h>
#include <asm/page.h>
#include <asm/sysreg.h>
+#include <asm/virt.h>
/*
* arm64_relocate_new_kernel - Put a 2nd stage image in place and boot it.
@@ -61,12 +62,20 @@ SYM_CODE_START(arm64_relocate_new_kernel)
isb
/* Start new image. */
+ ldr x1, [x0, #KIMAGE_ARCH_EL2_VECTORS] /* relocation start */
+ cbz x1, .Lel1
+ ldr x1, [x0, #KIMAGE_START] /* relocation start */
+ ldr x2, [x0, #KIMAGE_ARCH_DTB_MEM] /* dtb address */
+ mov x3, xzr
+ mov x4, xzr
+ mov x0, #HVC_SOFT_RESTART
+ hvc #0 /* Jumps from el2 */
+.Lel1:
ldr x4, [x0, #KIMAGE_START] /* relocation start */
ldr x0, [x0, #KIMAGE_ARCH_DTB_MEM] /* dtb address */
- mov x1, xzr
mov x2, xzr
mov x3, xzr
- br x4
+ br x4 /* Jumps from el1 */
SYM_CODE_END(arm64_relocate_new_kernel)
.align 3 /* To keep the 64-bit values below naturally aligned. */
--
2.25.1
next prev parent reply other threads:[~2021-05-27 15:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 15:05 [PATCH 00/18] arm64: MMU enabled kexec relocation Pavel Tatashin
2021-05-27 15:05 ` [PATCH 01/18] arm64: hyp-stub: Check the size of the HYP stub's vectors Pavel Tatashin
2021-05-27 15:05 ` [PATCH 02/18] arm64: hyp-stub: Move invalid vector entries into the vectors Pavel Tatashin
2021-05-27 15:05 ` [PATCH 03/18] arm64: hyp-stub: Move elx_sync " Pavel Tatashin
2021-05-27 15:54 ` Marc Zyngier
2021-05-27 21:23 ` Pavel Tatashin
2021-06-01 12:22 ` Marc Zyngier
2021-06-02 1:18 ` Pavel Tatashin
2021-06-08 17:46 ` Pavel Tatashin
2021-05-27 15:05 ` [PATCH 04/18] arm64: kernel: add helper for booted at EL2 and not VHE Pavel Tatashin
2021-06-01 12:38 ` Marc Zyngier
2021-06-02 1:33 ` Pavel Tatashin
2021-06-02 8:20 ` Marc Zyngier
2021-05-27 15:05 ` [PATCH 05/18] arm64: trans_pgd: hibernate: Add trans_pgd_copy_el2_vectors Pavel Tatashin
2021-05-27 15:05 ` [PATCH 06/18] arm64: hibernate: abstract ttrb0 setup function Pavel Tatashin
2021-05-27 15:05 ` [PATCH 07/18] arm64: kexec: flush image and lists during kexec load time Pavel Tatashin
2021-05-27 15:05 ` [PATCH 08/18] arm64: kexec: skip relocation code for inplace kexec Pavel Tatashin
2021-05-27 15:05 ` [PATCH 09/18] arm64: kexec: Use dcache ops macros instead of open-coding Pavel Tatashin
2021-05-27 15:05 ` [PATCH 10/18] arm64: kexec: pass kimage as the only argument to relocation function Pavel Tatashin
2021-05-27 15:05 ` [PATCH 11/18] arm64: kexec: kexec may require EL2 vectors Pavel Tatashin
2021-05-27 15:05 ` Pavel Tatashin [this message]
2021-05-27 15:05 ` [PATCH 13/18] arm64: kexec: use ld script for relocation function Pavel Tatashin
2021-05-27 15:05 ` [PATCH 14/18] arm64: kexec: install a copy of the linear-map Pavel Tatashin
2021-05-27 15:05 ` [PATCH 15/18] arm64: kexec: keep MMU enabled during kexec relocation Pavel Tatashin
2021-05-27 15:05 ` [PATCH 16/18] arm64: kexec: remove the pre-kexec PoC maintenance Pavel Tatashin
2021-05-27 15:05 ` [PATCH 17/18] arm64: kexec: Remove cpu-reset.h Pavel Tatashin
2021-05-27 15:05 ` [PATCH 18/18] arm64/mm: remove useless trans_pgd_map_page() Pavel Tatashin
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