[PULL,25/28] target/riscv/kvm.c: Fix the hart bit setting of AIA

Commit Message

Alistair Francis May 28, 2024, 2:43 a.m. UTC

From: Yong-Xuan Wang <[e-mail]>

In AIA spec, each hart (or each hart within a group) has a unique hart
number to locate the memory pages of interrupt files in the address
space. The number of bits required to represent any hart number is equal
to ceil(log2(hmax + 1)), where hmax is the largest hart number among
groups.

However, if the largest hart number among groups is a power of 2, QEMU
will pass an inaccurate hart-index-bit setting to Linux. For example, when
the guest OS has 4 harts, only ceil(log2(3 + 1)) = 2 bits are sufficient
to represent 4 harts, but we passes 3 to Linux. The code needs to be
updated to ensure accurate hart-index-bit settings.

Additionally, a Linux patch[1] is necessary to correctly recover the hart
index when the guest OS has only 1 hart, where the hart-index-bit is 0.

[1] https://lore.kernel.org/lkml/[e-mail]/t/

Signed-off-by: Yong-Xuan Wang <[e-mail]>
Reviewed-by: Andrew Jones <[e-mail]>
Cc: qemu-stable <[e-mail]>
Message-ID: <[e-mail]>
Signed-off-by: Alistair Francis <[e-mail]>
---
 target/riscv/kvm/kvm-cpu.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Patch

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 473416649f..235e2cdaca 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1777,7 +1777,14 @@  void kvm_riscv_aia_create(MachineState *machine, uint64_t group_shift,
         }
     }
 
-    hart_bits = find_last_bit(&max_hart_per_socket, BITS_PER_LONG) + 1;
+
+    if (max_hart_per_socket > 1) {
+        max_hart_per_socket--;
+        hart_bits = find_last_bit(&max_hart_per_socket, BITS_PER_LONG) + 1;
+    } else {
+        hart_bits = 0;
+    }
+
     ret = kvm_device_access(aia_fd, KVM_DEV_RISCV_AIA_GRP_CONFIG,
                             KVM_DEV_RISCV_AIA_CONFIG_HART_BITS,
                             &hart_bits, true, NULL);