[GIT PULL] x86 fixes

Ingo Molnar
2017-09-12T15:39:01Z

Linus,

Please pull the latest x86-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

# HEAD: e2329b4252f373c244e75928be38bf1dd45b35da x86/cpu: Remove unused and undefined __generic_processor_info() declaration

Two fixes: dead code removal, plus a SME memory encryption fix on 32-bit kernels
that crashed Xen guests.

out-of-topic modifications in x86-urgent-for-linus:
-----------------------------------------------------
include/linux/mem_encrypt.h # 21d9bb4a05ba: x86/mm: Make the SME mask a

Thanks,

Ingo

------------------>
Borislav Petkov (1):
x86/mm: Make the SME mask a u64

Dou Liyang (1):
x86/cpu: Remove unused and undefined __generic_processor_info() declaration

arch/x86/include/asm/mem_encrypt.h | 4 ++--
arch/x86/include/asm/mpspec.h | 1 -
arch/x86/kernel/apic/apic.c | 2 +-
arch/x86/mm/mem_encrypt.c | 2 +-
include/linux/mem_encrypt.h | 13 +++++++++----
5 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 8e618fcf1f7c..6a77c63540f7 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -21,7 +21,7 @@

#ifdef CONFIG_AMD_MEM_ENCRYPT

-extern unsigned long sme_me_mask;
+extern u64 sme_me_mask;

void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
unsigned long decrypted_kernel_vaddr,
@@ -49,7 +49,7 @@ void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);

#else /* !CONFIG_AMD_MEM_ENCRYPT */

-#define sme_me_mask 0UL
+#define sme_me_mask 0ULL

static inline void __init sme_early_encrypt(resource_size_t paddr,
unsigned long size) { }
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index 831eb7895535..c471ca1f9412 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -86,7 +86,6 @@ static inline void e820__memblock_alloc_reserved_mpc_new(void) { }
#endif

int generic_processor_info(int apicid, int version);
-int __generic_processor_info(int apicid, int version, bool enabled);

#define PHYSID_ARRAY_SIZE BITS_TO_LONGS(MAX_LOCAL_APIC)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 7834f73efbf1..6e19ef152869 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2130,7 +2130,7 @@ int generic_processor_info(int apicid, int version)
* Since fixing handling of boot_cpu_physical_apicid requires
* another discussion and tests on each platform, we leave it
* for now and here we use read_apic_id() directly in this
- * function, __generic_processor_info().
+ * function, generic_processor_info().
*/
if (disabled_cpu_apicid != BAD_APICID &&
disabled_cpu_apicid != read_apic_id() &&
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 0fbd09269757..3fcc8e01683b 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -37,7 +37,7 @@ static char sme_cmdline_off[] __initdata = "off";
* reside in the .data section so as not to be zeroed out when the .bss
* section is later cleared.
*/
-unsigned long sme_me_mask __section(.data) = 0;
+u64 sme_me_mask __section(.data) = 0;
EXPORT_SYMBOL_GPL(sme_me_mask);

/* Buffer used for early in-place encryption by BSP, no locking needed */
diff --git a/include/linux/mem_encrypt.h b/include/linux/mem_encrypt.h
index 1255f09f5e42..265a9cd21cb4 100644
--- a/include/linux/mem_encrypt.h
+++ b/include/linux/mem_encrypt.h
@@ -21,7 +21,7 @@

#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */

-#define sme_me_mask 0UL
+#define sme_me_mask 0ULL

#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */

@@ -30,18 +30,23 @@ static inline bool sme_active(void)
return !!sme_me_mask;
}

-static inline unsigned long sme_get_me_mask(void)
+static inline u64 sme_get_me_mask(void)
{
return sme_me_mask;
}

+#ifdef CONFIG_AMD_MEM_ENCRYPT
/*
* The __sme_set() and __sme_clr() macros are useful for adding or removing
* the encryption mask from a value (e.g. when dealing with pagetable
* entries).
*/
-#define __sme_set(x) ((unsigned long)(x) | sme_me_mask)
-#define __sme_clr(x) ((unsigned long)(x) & ~sme_me_mask)
+#define __sme_set(x) ((x) | sme_me_mask)
+#define __sme_clr(x) ((x) & ~sme_me_mask)
+#else
+#define __sme_set(x) (x)
+#define __sme_clr(x) (x)
+#endif

#endif /* __ASSEMBLY__ */