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Subject[PATCH] x86/sev-es: Expose __sev_es_ghcb_hv_call() to call ghcb hv call out of sev code
Date
From: Tianyu Lan <Tianyu.Lan@microsoft.com>


Hyper-V also needs to call ghcb hv call to write/read MSR in Isolation VM.
So expose __sev_es_ghcb_hv_call() to call it in the Hyper-V code.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
arch/x86/include/asm/sev.h | 11 +++++++++++
arch/x86/kernel/sev-shared.c | 24 +++++++++++++++++++-----
2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index fa5cd05d3b5b..295c847c3cd4 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -81,12 +81,23 @@ static __always_inline void sev_es_nmi_complete(void)
__sev_es_nmi_complete();
}
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
+extern enum es_result __sev_es_ghcb_hv_call(struct ghcb *ghcb,
+ struct es_em_ctxt *ctxt,
+ u64 exit_code, u64 exit_info_1,
+ u64 exit_info_2);
#else
static inline void sev_es_ist_enter(struct pt_regs *regs) { }
static inline void sev_es_ist_exit(void) { }
static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
static inline void sev_es_nmi_complete(void) { }
static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
+static inline enum es_result
+__sev_es_ghcb_hv_call(struct ghcb *ghcb,
+ u64 exit_code, u64 exit_info_1,
+ u64 exit_info_2)
+{
+ return ES_VMM_ERROR;
+}
#endif

#endif
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index ea9abd69237e..08c97cb057fa 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -124,10 +124,14 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt
return ES_VMM_ERROR;
}

-static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
- struct es_em_ctxt *ctxt,
- u64 exit_code, u64 exit_info_1,
- u64 exit_info_2)
+/*
+ * __sev_es_ghcb_hv_call() is also used in the other platform code(e.g
+ * Hyper-V).
+ */
+enum es_result __sev_es_ghcb_hv_call(struct ghcb *ghcb,
+ struct es_em_ctxt *ctxt,
+ u64 exit_code, u64 exit_info_1,
+ u64 exit_info_2)
{
/* Fill in protocol and format specifiers */
ghcb->protocol_version = GHCB_PROTOCOL_MAX;
@@ -137,12 +141,22 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
ghcb_set_sw_exit_info_2(ghcb, exit_info_2);

- sev_es_wr_ghcb_msr(__pa(ghcb));
VMGEXIT();

return verify_exception_info(ghcb, ctxt);
}

+static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
+ struct es_em_ctxt *ctxt,
+ u64 exit_code, u64 exit_info_1,
+ u64 exit_info_2)
+{
+ sev_es_wr_ghcb_msr(__pa(ghcb));
+
+ return __sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1,
+ exit_info_2);
+}
+
/*
* Boot VC Handler - This is the first VC handler during boot, there is no GHCB
* page yet, so it only supports the MSR based communication with the
--
2.25.1
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