Merge branch 'for-next/kexec' into for-next/core

* for-next/kexec:
  arm64: trans_pgd: remove trans_pgd_map_page()
  arm64: kexec: remove cpu-reset.h
  arm64: kexec: remove the pre-kexec PoC maintenance
  arm64: kexec: keep MMU enabled during kexec relocation
  arm64: kexec: install a copy of the linear-map
  arm64: kexec: use ld script for relocation function
  arm64: kexec: relocate in EL1 mode
  arm64: kexec: configure EL2 vectors for kexec
  arm64: kexec: pass kimage as the only argument to relocation function
  arm64: kexec: Use dcache ops macros instead of open-coding
  arm64: kexec: skip relocation code for inplace kexec
  arm64: kexec: flush image and lists during kexec load time
  arm64: hibernate: abstract ttrb0 setup function
  arm64: trans_pgd: hibernate: Add trans_pgd_copy_el2_vectors
  arm64: kernel: add helper for booted at EL2 and not VHE

3 files changed, 91 insertions, 59 deletions

diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
index f188c9092696..ff1e800ba7a1 100644
--- a/arch/arm64/mm/Makefile
+++ b/arch/arm64/mm/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
 obj-$(CONFIG_PTDUMP_CORE)	+= ptdump.o
 obj-$(CONFIG_PTDUMP_DEBUGFS)	+= ptdump_debugfs.o
 obj-$(CONFIG_TRANS_TABLE)	+= trans_pgd.o
+obj-$(CONFIG_TRANS_TABLE)	+= trans_pgd-asm.o
 obj-$(CONFIG_DEBUG_VIRTUAL)	+= physaddr.o
 obj-$(CONFIG_ARM64_MTE)		+= mteswap.o
 KASAN_SANITIZE_physaddr.o	+= n
diff --git a/arch/arm64/mm/trans_pgd-asm.S b/arch/arm64/mm/trans_pgd-asm.S
new file mode 100644
index 000000000000..021c31573bcb
--- /dev/null
+++ b/arch/arm64/mm/trans_pgd-asm.S
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * Copyright (c) 2021, Microsoft Corporation.
+ * Pasha Tatashin <pasha.tatashin@soleen.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/kvm_asm.h>
+
+.macro invalid_vector	label
+SYM_CODE_START_LOCAL(\label)
+	.align 7
+	b	\label
+SYM_CODE_END(\label)
+.endm
+
+.macro el1_sync_vector
+SYM_CODE_START_LOCAL(el1_sync)
+	.align 7
+	cmp	x0, #HVC_SET_VECTORS	/* Called from hibernate */
+	b.ne	1f
+	msr	vbar_el2, x1
+	mov	x0, xzr
+	eret
+1:	cmp	x0, #HVC_SOFT_RESTART	/* Called from kexec */
+	b.ne	2f
+	mov	x0, x2
+	mov	x2, x4
+	mov	x4, x1
+	mov	x1, x3
+	br	x4
+2:	/* Unexpected argument, set an error */
+	mov_q	x0, HVC_STUB_ERR
+	eret
+SYM_CODE_END(el1_sync)
+.endm
+
+SYM_CODE_START(trans_pgd_stub_vectors)
+	invalid_vector	hyp_stub_el2t_sync_invalid	// Synchronous EL2t
+	invalid_vector	hyp_stub_el2t_irq_invalid	// IRQ EL2t
+	invalid_vector	hyp_stub_el2t_fiq_invalid	// FIQ EL2t
+	invalid_vector	hyp_stub_el2t_error_invalid	// Error EL2t
+
+	invalid_vector	hyp_stub_el2h_sync_invalid	// Synchronous EL2h
+	invalid_vector	hyp_stub_el2h_irq_invalid	// IRQ EL2h
+	invalid_vector	hyp_stub_el2h_fiq_invalid	// FIQ EL2h
+	invalid_vector	hyp_stub_el2h_error_invalid	// Error EL2h
+
+	el1_sync_vector					// Synchronous 64-bit EL1
+	invalid_vector	hyp_stub_el1_irq_invalid	// IRQ 64-bit EL1
+	invalid_vector	hyp_stub_el1_fiq_invalid	// FIQ 64-bit EL1
+	invalid_vector	hyp_stub_el1_error_invalid	// Error 64-bit EL1
+
+	invalid_vector	hyp_stub_32b_el1_sync_invalid	// Synchronous 32-bit EL1
+	invalid_vector	hyp_stub_32b_el1_irq_invalid	// IRQ 32-bit EL1
+	invalid_vector	hyp_stub_32b_el1_fiq_invalid	// FIQ 32-bit EL1
+	invalid_vector	hyp_stub_32b_el1_error_invalid	// Error 32-bit EL1
+	.align 11
+SYM_INNER_LABEL(__trans_pgd_stub_vectors_end, SYM_L_LOCAL)
+SYM_CODE_END(trans_pgd_stub_vectors)
+
+# Check the trans_pgd_stub_vectors didn't overflow
+.org . - (__trans_pgd_stub_vectors_end - trans_pgd_stub_vectors) + SZ_2K
diff --git a/arch/arm64/mm/trans_pgd.c b/arch/arm64/mm/trans_pgd.c
index 527f0a39c3da..d7da8ca40d2e 100644
--- a/arch/arm64/mm/trans_pgd.c
+++ b/arch/arm64/mm/trans_pgd.c
@@ -5,8 +5,8 @@
  *
  * This file derived from: arch/arm64/kernel/hibernate.c
  *
- * Copyright (c) 2020, Microsoft Corporation.
- * Pavel Tatashin <pasha.tatashin@soleen.com>
+ * Copyright (c) 2021, Microsoft Corporation.
+ * Pasha Tatashin <pasha.tatashin@soleen.com>
  *
  */
 
@@ -218,63 +218,6 @@ int trans_pgd_create_copy(struct trans_pgd_info *info, pgd_t **dst_pgdp,
 }
 
 /*
- * Add map entry to trans_pgd for a base-size page at PTE level.
- * info:	contains allocator and its argument
- * trans_pgd:	page table in which new map is added.
- * page:	page to be mapped.
- * dst_addr:	new VA address for the page
- * pgprot:	protection for the page.
- *
- * Returns 0 on success, and -ENOMEM on failure.
- */
-int trans_pgd_map_page(struct trans_pgd_info *info, pgd_t *trans_pgd,
-		       void *page, unsigned long dst_addr, pgprot_t pgprot)
-{
-	pgd_t *pgdp;
-	p4d_t *p4dp;
-	pud_t *pudp;
-	pmd_t *pmdp;
-	pte_t *ptep;
-
-	pgdp = pgd_offset_pgd(trans_pgd, dst_addr);
-	if (pgd_none(READ_ONCE(*pgdp))) {
-		p4dp = trans_alloc(info);
-		if (!pgdp)
-			return -ENOMEM;
-		pgd_populate(NULL, pgdp, p4dp);
-	}
-
-	p4dp = p4d_offset(pgdp, dst_addr);
-	if (p4d_none(READ_ONCE(*p4dp))) {
-		pudp = trans_alloc(info);
-		if (!pudp)
-			return -ENOMEM;
-		p4d_populate(NULL, p4dp, pudp);
-	}
-
-	pudp = pud_offset(p4dp, dst_addr);
-	if (pud_none(READ_ONCE(*pudp))) {
-		pmdp = trans_alloc(info);
-		if (!pmdp)
-			return -ENOMEM;
-		pud_populate(NULL, pudp, pmdp);
-	}
-
-	pmdp = pmd_offset(pudp, dst_addr);
-	if (pmd_none(READ_ONCE(*pmdp))) {
-		ptep = trans_alloc(info);
-		if (!ptep)
-			return -ENOMEM;
-		pmd_populate_kernel(NULL, pmdp, ptep);
-	}
-
-	ptep = pte_offset_kernel(pmdp, dst_addr);
-	set_pte(ptep, pfn_pte(virt_to_pfn(page), pgprot));
-
-	return 0;
-}
-
-/*
  * The page we want to idmap may be outside the range covered by VA_BITS that
  * can be built using the kernel's p?d_populate() helpers. As a one off, for a
  * single page, we build these page tables bottom up and just assume that will
@@ -322,3 +265,26 @@ int trans_pgd_idmap_page(struct trans_pgd_info *info, phys_addr_t *trans_ttbr0,
 
 	return 0;
 }
+
+/*
+ * Create a copy of the vector table so we can call HVC_SET_VECTORS or
+ * HVC_SOFT_RESTART from contexts where the table may be overwritten.
+ */
+int trans_pgd_copy_el2_vectors(struct trans_pgd_info *info,
+			       phys_addr_t *el2_vectors)
+{
+	void *hyp_stub = trans_alloc(info);
+
+	if (!hyp_stub)
+		return -ENOMEM;
+	*el2_vectors = virt_to_phys(hyp_stub);
+	memcpy(hyp_stub, &trans_pgd_stub_vectors, ARM64_VECTOR_TABLE_LEN);
+	caches_clean_inval_pou((unsigned long)hyp_stub,
+			       (unsigned long)hyp_stub +
+			       ARM64_VECTOR_TABLE_LEN);
+	dcache_clean_inval_poc((unsigned long)hyp_stub,
+			       (unsigned long)hyp_stub +
+			       ARM64_VECTOR_TABLE_LEN);
+
+	return 0;
+}