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x86/microcode: Convert to bare minimum MSR accessors

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Having tracepoints to the MSR accessors makes them unsuitable for early
microcode loading: think 32-bit before paging is enabled and us chasing
pointers to test whether a tracepoint is enabled or not. Results in a
reliable triple fault.

Convert to the bare ones.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20170120202955.4091-4-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Borislav Petkov 2017-01-20 21:29:42 +01:00 committed by Thomas Gleixner
parent a585df8eda
commit 0c12d18ab9
1 changed files with 4 additions and 5 deletions
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9
arch/x86/include/asm/microcode.h
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@ -7,18 +7,17 @@
#define native_rdmsr(msr, val1, val2) \
do { \
u64 __val = native_read_msr((msr)); \
u64 __val = __rdmsr((msr)); \
(void)((val1) = (u32)__val); \
(void)((val2) = (u32)(__val >> 32)); \
} while (0)
#define native_wrmsr(msr, low, high) \
native_write_msr(msr, low, high)
__wrmsr(msr, low, high)
#define native_wrmsrl(msr, val) \
native_write_msr((msr), \
(u32)((u64)(val)), \
(u32)((u64)(val) >> 32))
__wrmsr((msr), (u32)((u64)(val)), \
(u32)((u64)(val) >> 32))
struct ucode_patch {
struct list_head plist;