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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-arm-kernel@lists.infradead.org,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>
Subject: [PATCH 2/2] efi/arm: Revert "Defer persistent reservations until after paging_init()"
Date: Fri, 15 Feb 2019 13:33:33 +0100
Message-ID: <20190215123333.21209-3-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20190215123333.21209-1-ard.biesheuvel@linaro.org>

This reverts commit eff896288872d687d9662000ec9ae11b6d61766f, which
deferred the processing of persistent memory reservations to a point
where the memory may have already been allocated and overwritten,
defeating the purpose.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 arch/arm64/kernel/setup.c               | 1 -
 drivers/firmware/efi/efi.c              | 4 ----
 drivers/firmware/efi/libstub/arm-stub.c | 3 ---
 include/linux/efi.h                     | 7 -------
 4 files changed, 15 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 4b0e1231625c..d09ec76f08cf 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -313,7 +313,6 @@ void __init setup_arch(char **cmdline_p)
 	arm64_memblock_init();
 
 	paging_init();
-	efi_apply_persistent_mem_reservations();
 
 	acpi_table_upgrade();
 
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 4c46ff6f2242..55b77c576c42 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -592,11 +592,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
 
 		early_memunmap(tbl, sizeof(*tbl));
 	}
-	return 0;
-}
 
-int __init efi_apply_persistent_mem_reservations(void)
-{
 	if (efi.mem_reserve != EFI_INVALID_TABLE_ADDR) {
 		unsigned long prsv = efi.mem_reserve;
 
diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
index eee42d5e25ee..c037c6c5d0b7 100644
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ b/drivers/firmware/efi/libstub/arm-stub.c
@@ -75,9 +75,6 @@ void install_memreserve_table(efi_system_table_t *sys_table_arg)
 	efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID;
 	efi_status_t status;
 
-	if (IS_ENABLED(CONFIG_ARM))
-		return;
-
 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
 				(void **)&rsv);
 	if (status != EFI_SUCCESS) {
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 45ff763fba76..28604a8d0aa9 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1198,8 +1198,6 @@ static inline bool efi_enabled(int feature)
 extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
 
 extern bool efi_is_table_address(unsigned long phys_addr);
-
-extern int efi_apply_persistent_mem_reservations(void);
 #else
 static inline bool efi_enabled(int feature)
 {
@@ -1218,11 +1216,6 @@ static inline bool efi_is_table_address(unsigned long phys_addr)
 {
 	return false;
 }
-
-static inline int efi_apply_persistent_mem_reservations(void)
-{
-	return 0;
-}
 #endif
 
 extern int efi_status_to_err(efi_status_t status);
-- 
2.20.1


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  parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-15 12:33 [GIT PULL 0/2] EFI fixes for v5.0-rc Ard Biesheuvel
2019-02-15 12:33 ` [PATCH 1/2] arm64: account for GICv3 LPI tables in static memblock reserve table Ard Biesheuvel
2019-02-15 12:33 ` Ard Biesheuvel [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-02-13 13:27 [PATCH 0/2] efi/arm/gicv3: implement fix for memory reservation issue Ard Biesheuvel
2019-02-13 13:27 ` [PATCH 2/2] efi/arm: Revert "Defer persistent reservations until after paging_init()" Ard Biesheuvel

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