Origin: Linux 64222515138e43da1fcf288f0289ef1020427b87
Suppress -Waddress-of-packed-member to allow taking addresses on struct
ghcb / struct vmcb_save_area fields.
Signed-off-by: Varad Gautam <varad.gautam@xxxxxxxx>
---
lib/x86/amd_sev.h | 106 ++++++++++++++++++++++++++++++++++++++++++++
lib/x86/svm.h | 37 ++++++++++++++++
x86/Makefile.x86_64 | 1 +
3 files changed, 144 insertions(+)
diff --git a/lib/x86/amd_sev.h b/lib/x86/amd_sev.h
index afbacf3..ed71c18 100644
--- a/lib/x86/amd_sev.h
+++ b/lib/x86/amd_sev.h
@@ -18,6 +18,49 @@
#include "desc.h"
#include "asm/page.h"
#include "efi.h"
+#include "processor.h"
+#include "insn/insn.h"
+#include "svm.h"
+
+struct __attribute__ ((__packed__)) ghcb {
+ struct vmcb_save_area save;
+ u8 reserved_save[2048 - sizeof(struct vmcb_save_area)];
+
+ u8 shared_buffer[2032];
+
+ u8 reserved_1[10];
+ u16 protocol_version; /* negotiated SEV-ES/GHCB protocol version */
+ u32 ghcb_usage;
+};
+
+/* SEV definitions from linux's include/asm/sev.h */
+#define GHCB_PROTO_OUR 0x0001UL
+#define GHCB_PROTOCOL_MAX 1ULL
+#define GHCB_DEFAULT_USAGE 0ULL
+
+#define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
+
+enum es_result {
+ ES_OK, /* All good */
+ ES_UNSUPPORTED, /* Requested operation not supported */
+ ES_VMM_ERROR, /* Unexpected state from the VMM */
+ ES_DECODE_FAILED, /* Instruction decoding failed */
+ ES_EXCEPTION, /* Instruction caused exception */
+ ES_RETRY, /* Retry instruction emulation */
+};
+
+struct es_fault_info {
+ unsigned long vector;
+ unsigned long error_code;
+ unsigned long cr2;
+};
+
+/* ES instruction emulation context */
+struct es_em_ctxt {
+ struct ex_regs *regs;
+ struct insn insn;
+ struct es_fault_info fi;
+};
/*
* AMD Programmer's Manual Volume 3
@@ -59,6 +102,69 @@ void handle_sev_es_vc(struct ex_regs *regs);
unsigned long long get_amd_sev_c_bit_mask(void);
unsigned long long get_amd_sev_addr_upperbound(void);
+static int _test_bit(int nr, const volatile unsigned long *addr)
+{
+ const volatile unsigned long *word = addr + BIT_WORD(nr);
+ unsigned long mask = BIT_MASK(nr);
+
+ return (*word & mask) != 0;
+}
+
+/* GHCB Accessor functions from Linux's include/asm/svm.h */
+
+#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 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), \
+ (u8 *)&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)
+
+#define MSR_AMD64_SEV_ES_GHCB 0xc0010130
+
#endif /* TARGET_EFI */
#endif /* _X86_AMD_SEV_H_ */
diff --git a/lib/x86/svm.h b/lib/x86/svm.h
index f74b13a..f046455 100644
--- a/lib/x86/svm.h
+++ b/lib/x86/svm.h
@@ -197,6 +197,42 @@ struct __attribute__ ((__packed__)) vmcb_save_area {
u64 br_to;
u64 last_excp_from;
u64 last_excp_to;
+
+ /*
+ * The following part of the save area is valid only for
+ * SEV-ES guests when referenced through the GHCB or for
+ * saving to the host save area.
+ */
+ u8 reserved_7[72];
+ u32 spec_ctrl; /* Guest version of SPEC_CTRL at 0x2E0 */
+ u8 reserved_7b[4];
+ u32 pkru;
+ u8 reserved_7a[20];
+ u64 reserved_8; /* rax already available at 0x01f8 */
+ u64 rcx;
+ u64 rdx;
+ u64 rbx;
+ u64 reserved_9; /* rsp already available at 0x01d8 */
+ u64 rbp;
+ u64 rsi;
+ u64 rdi;
+ u64 r8;
+ u64 r9;
+ u64 r10;
+ u64 r11;
+ u64 r12;
+ u64 r13;
+ u64 r14;
+ u64 r15;
+ u8 reserved_10[16];
+ u64 sw_exit_code;
+ u64 sw_exit_info_1;
+ u64 sw_exit_info_2;
+ u64 sw_scratch;
+ u8 reserved_11[56];
+ u64 xcr0;
+ u8 valid_bitmap[16];
+ u64 x87_state_gpa;
};
struct __attribute__ ((__packed__)) vmcb {
@@ -297,6 +333,7 @@ struct __attribute__ ((__packed__)) vmcb {
#define SVM_EXIT_WRITE_DR6 0x036
#define SVM_EXIT_WRITE_DR7 0x037
#define SVM_EXIT_EXCP_BASE 0x040
+#define SVM_EXIT_LAST_EXCP 0x05f
#define SVM_EXIT_INTR 0x060
#define SVM_EXIT_NMI 0x061
#define SVM_EXIT_SMI 0x062
diff --git a/x86/Makefile.x86_64 b/x86/Makefile.x86_64
index 3963840..eeb321b 100644
--- a/x86/Makefile.x86_64
+++ b/x86/Makefile.x86_64
@@ -13,6 +13,7 @@ endif
fcf_protection_full := $(call cc-option, -fcf-protection=full,)
COMMON_CFLAGS += -mno-red-zone -mno-sse -mno-sse2 $(fcf_protection_full)
+COMMON_CFLAGS += -Wno-address-of-packed-member
cflatobjs += lib/x86/setjmp64.o
cflatobjs += lib/x86/intel-iommu.o
--
2.32.0
