[PATCH v2 03/12] KVM: arm64: Add latest HFGITR_EL2 FGT entries to nested virt

Fuad Tabba
2023-12-06T10:05:50Z

Add the missing nested virt FGT table entries HFGITR_EL2. Based
on the 2023-09 Arm Architecture System Registers xml
specification [*]. Add the missing field definitions as well,
both to generate the correct RES0 mask and to be able to toggle
their FGT bits.

Also adds definitions of some of the missing system registers and
instructions, which can be trapped by the FGT bits.

[*] https://developer.arm.com/downloads/-/exploration-tools

Signed-off-by: Fuad Tabba <tabba@google.com>
---
arch/arm64/include/asm/sysreg.h | 7 +++++++
arch/arm64/kvm/emulate-nested.c | 5 +++++
arch/arm64/tools/sysreg | 4 +++-
3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 7b469b3ac1f9..5892f9f1b541 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -658,6 +658,7 @@
#define OP_AT_S1E0W sys_insn(AT_Op0, 0, AT_CRn, 8, 3)
#define OP_AT_S1E1RP sys_insn(AT_Op0, 0, AT_CRn, 9, 0)
#define OP_AT_S1E1WP sys_insn(AT_Op0, 0, AT_CRn, 9, 1)
+#define OP_AT_S1E1A sys_insn(AT_Op0, 0, AT_CRn, 9, 2)
#define OP_AT_S1E2R sys_insn(AT_Op0, 4, AT_CRn, 8, 0)
#define OP_AT_S1E2W sys_insn(AT_Op0, 4, AT_CRn, 8, 1)
#define OP_AT_S12E1R sys_insn(AT_Op0, 4, AT_CRn, 8, 4)
@@ -794,10 +795,16 @@
#define OP_TLBI_VMALLS12E1NXS sys_insn(1, 4, 9, 7, 6)

/* Misc instructions */
+#define OP_GCSPUSHX sys_insn(1, 0, 7, 7, 4)
+#define OP_GCSPOPCX sys_insn(1, 0, 7, 7, 5)
+#define OP_GCSPOPX sys_insn(1, 0, 7, 7, 6)
+#define OP_GCSPUSHM sys_insn(1, 3, 7, 7, 0)
+
#define OP_BRB_IALL sys_insn(1, 1, 7, 2, 4)
#define OP_BRB_INJ sys_insn(1, 1, 7, 2, 5)
#define OP_CFP_RCTX sys_insn(1, 3, 7, 3, 4)
#define OP_DVP_RCTX sys_insn(1, 3, 7, 3, 5)
+#define OP_COSP_RCTX sys_insn(1, 3, 7, 3, 6)
#define OP_CPP_RCTX sys_insn(1, 3, 7, 3, 7)

/* Common SCTLR_ELx flags. */
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 8b473a1bbc11..89901550db34 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -1117,6 +1117,11 @@ static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
SR_FGT(SYS_AFSR1_EL1, HFGxTR, AFSR1_EL1, 1),
SR_FGT(SYS_AFSR0_EL1, HFGxTR, AFSR0_EL1, 1),
/* HFGITR_EL2 */
+ SR_FGT(OP_AT_S1E1A, HFGITR, ATS1E1A, 1),
+ SR_FGT(OP_COSP_RCTX, HFGITR, COSPRCTX, 1),
+ SR_FGT(OP_GCSPUSHX, HFGITR, nGCSEPP, 0),
+ SR_FGT(OP_GCSPOPX, HFGITR, nGCSEPP, 0),
+ SR_FGT(OP_GCSPUSHM, HFGITR, nGCSPUSHM_EL1, 0),
SR_FGT(OP_BRB_IALL, HFGITR, nBRBIALL, 0),
SR_FGT(OP_BRB_INJ, HFGITR, nBRBINJ, 0),
SR_FGT(SYS_DC_CVAC, HFGITR, DCCVAC, 1),
diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index c6cc8f2396e6..61cc3bcfc3fa 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -2102,7 +2102,9 @@ Fields HFGxTR_EL2
EndSysreg

Sysreg HFGITR_EL2 3 4 1 1 6
-Res0 63:61
+Res0 63
+Field 62 ATS1E1A
+Res0 61
Field 60 COSPRCTX
Field 59 nGCSEPP
Field 58 nGCSSTR_EL1
--
2.43.0.rc2.451.g8631bc7472-goog