Commit 0c12d18a authored Jan 20, 2017 by Borislav Petkov Committed by Thomas Gleixner Jan 23, 2017

x86/microcode: Convert to bare minimum MSR accessors



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>

parent a585df8e

arch/x86/include/asm/microcode.h

+4 −5

Original line number	Diff line number	Diff line
		@@ -7,17 +7,16 @@

		#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)), \
		__wrmsr((msr), (u32)((u64)(val)), \
		(u32)((u64)(val) >> 32))

		struct ucode_patch {