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KVM: SVM: Add GHCB accessor functions for retrieving fields 

Update the GHCB accessor functions to add functions for retrieve GHCB
fields by name. Update existing code to use the new accessor functions.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <664172c53a5fb4959914e1a45d88e805649af0ad.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tom Lendacky 2020-12-10 11:09:39 -06:00 committed by Paolo Bonzini
parent 916391a2d1
commit 0f60bde15e
2 changed files with 16 additions and 6 deletions
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10
arch/x86/include/asm/svm.h
View File

@ -379,6 +379,16 @@ struct vmcb {
(unsigned long *)&ghcb->save.valid_bitmap); \
} \
\
static inline u64 ghcb_get_##field(struct ghcb *ghcb) \
{ \
return ghcb->save.field; \
} \
\
static inline u64 ghcb_get_##field##_if_valid(struct ghcb *ghcb) \
{ \
return ghcb_##field##_is_valid(ghcb) ? ghcb->save.field : 0; \
} \
\
static inline void ghcb_set_##field(struct ghcb *ghcb, u64 value) \
{ \
__set_bit(GHCB_BITMAP_IDX(field), \

12
arch/x86/kernel/cpu/vmware.c
View File

@ -501,12 +501,12 @@ static bool vmware_sev_es_hcall_finish(struct ghcb *ghcb, struct pt_regs *regs)
ghcb_rbp_is_valid(ghcb)))
return false;
regs->bx = ghcb->save.rbx;
regs->cx = ghcb->save.rcx;
regs->dx = ghcb->save.rdx;
regs->si = ghcb->save.rsi;
regs->di = ghcb->save.rdi;
regs->bp = ghcb->save.rbp;
regs->bx = ghcb_get_rbx(ghcb);
regs->cx = ghcb_get_rcx(ghcb);
regs->dx = ghcb_get_rdx(ghcb);
regs->si = ghcb_get_rsi(ghcb);
regs->di = ghcb_get_rdi(ghcb);
regs->bp = ghcb_get_rbp(ghcb);
return true;
}