Commit 3702c2f4 authored by Joerg Roedel's avatar Joerg Roedel Committed by Borislav Petkov
Browse files

KVM: SVM: Add GHCB Accessor functions 



Building a correct GHCB for the hypervisor requires setting valid bits
in the GHCB. Simplify that process by providing accessor functions to
set values and to update the valid bitmap and to check the valid bitmap
in KVM.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-4-joro@8bytes.org
parent d07f46f9

arch/x86/include/asm/svm.h

+43 −0
Original line number Diff line number Diff line
@@ -345,4 +345,47 @@ struct __attribute__ ((__packed__)) vmcb { 


#define SVM_CR0_SELECTIVE_MASK (X86_CR0_TS | X86_CR0_MP)



/* GHCB Accessor functions */



#define GHCB_BITMAP_IDX(field)							\

	(offsetof(struct vmcb_save_area, field) / sizeof(u64))



#define DEFINE_GHCB_ACCESSORS(field)						\

	static inline bool ghcb_##field##_is_valid(const struct ghcb *ghcb)	\

	{									\

		return test_bit(GHCB_BITMAP_IDX(field),				\

				(unsigned long *)&ghcb->save.valid_bitmap);	\

	}									\

										\

	static inline void ghcb_set_##field(struct ghcb *ghcb, u64 value)	\

	{									\

		__set_bit(GHCB_BITMAP_IDX(field),				\

			  (unsigned long *)&ghcb->save.valid_bitmap);		\

		ghcb->save.field = value;					\

	}



DEFINE_GHCB_ACCESSORS(cpl)

DEFINE_GHCB_ACCESSORS(rip)

DEFINE_GHCB_ACCESSORS(rsp)

DEFINE_GHCB_ACCESSORS(rax)

DEFINE_GHCB_ACCESSORS(rcx)

DEFINE_GHCB_ACCESSORS(rdx)

DEFINE_GHCB_ACCESSORS(rbx)

DEFINE_GHCB_ACCESSORS(rbp)

DEFINE_GHCB_ACCESSORS(rsi)

DEFINE_GHCB_ACCESSORS(rdi)

DEFINE_GHCB_ACCESSORS(r8)

DEFINE_GHCB_ACCESSORS(r9)

DEFINE_GHCB_ACCESSORS(r10)

DEFINE_GHCB_ACCESSORS(r11)

DEFINE_GHCB_ACCESSORS(r12)

DEFINE_GHCB_ACCESSORS(r13)

DEFINE_GHCB_ACCESSORS(r14)

DEFINE_GHCB_ACCESSORS(r15)

DEFINE_GHCB_ACCESSORS(sw_exit_code)

DEFINE_GHCB_ACCESSORS(sw_exit_info_1)

DEFINE_GHCB_ACCESSORS(sw_exit_info_2)

DEFINE_GHCB_ACCESSORS(sw_scratch)

DEFINE_GHCB_ACCESSORS(xcr0)



#endif

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