[PATCH] target/riscv: Fix LCOFI masking in sie/sip/mvip

Commit 27f9566dcd98 ("target/riscv: Update the local interrupt mask")
dropped bit 13 (MIP_LCOFIP) from the supervisor-visible interrupt masks.
As a result, with Sscofpmf enabled and LCOFIP delegated to S-mode, the
overflow interrupt would be raised in mip but never delivered and hence
perf sampling stopped receiving overflow interrupts.

Re-add MIP_LCOFIP to all_ints, sip_writable_mask, mvip_writable_mask
to allow it to be writable again.

Fixes: 27f9566dcd98 ("target/riscv: Update the local interrupt mask")
Signed-off-by: Mayuresh Chitale <[email protected]>
---
 target/riscv/tcg/csr.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/target/riscv/tcg/csr.c b/target/riscv/tcg/csr.c
index c05c8ee076..ca68c1f5f1 100644
--- a/target/riscv/tcg/csr.c
+++ b/target/riscv/tcg/csr.c
@@ -1890,7 +1890,8 @@ static const uint64_t delegable_ints =
 static const uint64_t vs_delegable_ints =
     (VS_MODE_INTERRUPTS | LOCAL_INTERRUPTS) & ~MIP_LCOFIP;
 static const uint64_t all_ints = M_MODE_INTERRUPTS | S_MODE_INTERRUPTS |
-                                     HS_MODE_INTERRUPTS | LOCAL_INTERRUPTS;
+                                     HS_MODE_INTERRUPTS | MIP_LCOFIP |
+                                     LOCAL_INTERRUPTS;
 #define DELEGABLE_EXCPS ((1ULL << (RISCV_EXCP_INST_ADDR_MIS)) | \
                          (1ULL << (RISCV_EXCP_INST_ACCESS_FAULT)) | \
                          (1ULL << (RISCV_EXCP_ILLEGAL_INST)) | \
@@ -1936,11 +1937,12 @@ static const target_ulong sstatus_v1_10_mask = SSTATUS_SIE | SSTATUS_SPIE |
 
 /* Bit STIP can be an alias of mip.STIP that's why it's writable in mvip. */
 static const uint64_t mvip_writable_mask = MIP_SSIP | MIP_STIP | MIP_SEIP |
-                                    LOCAL_INTERRUPTS;
+                                    MIP_LCOFIP | LOCAL_INTERRUPTS;
 static const uint64_t mvien_writable_mask = MIP_SSIP | MIP_SEIP |
                                     LOCAL_INTERRUPTS;
 
-static const uint64_t sip_writable_mask = SIP_SSIP | LOCAL_INTERRUPTS;
+static const uint64_t sip_writable_mask = SIP_SSIP | SIP_LCOFIP |
+                                          LOCAL_INTERRUPTS;
 static const uint64_t hip_writable_mask = MIP_VSSIP;
 static const uint64_t hvip_writable_mask = MIP_VSSIP | MIP_VSTIP |
                                     MIP_VSEIP | LOCAL_INTERRUPTS;
@@ -3953,9 +3955,9 @@ static RISCVException rmw_mvip64(CPURISCVState *env, int csrno,
      *  alias_mask denotes the bits that come from mip nalias_mask denotes bits
      *  that come from hvip.
      */
-    uint64_t alias_mask = ((S_MODE_INTERRUPTS | LOCAL_INTERRUPTS) &
+    uint64_t alias_mask = ((S_MODE_INTERRUPTS | MIP_LCOFIP | LOCAL_INTERRUPTS) &
         (env->mideleg | ~env->mvien)) | MIP_STIP;
-    uint64_t nalias_mask = (S_MODE_INTERRUPTS | LOCAL_INTERRUPTS) &
+    uint64_t nalias_mask = (S_MODE_INTERRUPTS | MIP_LCOFIP | LOCAL_INTERRUPTS) &
         (~env->mideleg & env->mvien);
     uint64_t wr_mask_mvip;
     uint64_t wr_mask_mip;
@@ -4188,9 +4190,10 @@ static RISCVException rmw_sie64(CPURISCVState *env, int csrno,
                                 uint64_t *ret_val,
                                 uint64_t new_val, uint64_t wr_mask)
 {
-    uint64_t nalias_mask = (S_MODE_INTERRUPTS | LOCAL_INTERRUPTS) &
+    uint64_t nalias_mask = (S_MODE_INTERRUPTS | MIP_LCOFIP | LOCAL_INTERRUPTS) &
         (~env->mideleg & env->mvien);
-    uint64_t alias_mask = (S_MODE_INTERRUPTS | LOCAL_INTERRUPTS) & env->mideleg;
+    uint64_t alias_mask = (S_MODE_INTERRUPTS | MIP_LCOFIP | LOCAL_INTERRUPTS) &
+        env->mideleg;
     uint64_t sie_mask = wr_mask & nalias_mask;
     RISCVException ret;
 
-- 
2.43.0