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[kvmtool,v3,4/4] riscv: Correct number of hart bits

Message ID 20240821142610.3297483-5-apatel@ventanamicro.com (mailing list archive)
State New, archived
Headers show
Series Add RISC-V ISA extensions based on Linux-6.10 | expand

Commit Message

Anup Patel Aug. 21, 2024, 2:26 p.m. UTC 
From: Andrew Jones <ajones@ventanamicro.com>

The number of hart bits should be obtained from the highest hart ID,
not the number of harts. For example, if a guest has 2 harts, then
the number of bits should be fls(1) == 1.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 riscv/aia.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/riscv/aia.c b/riscv/aia.c
index fe9399a..21d9704 100644
--- a/riscv/aia.c
+++ b/riscv/aia.c
@@ -164,7 +164,7 @@  static int aia__init(struct kvm *kvm)
 	ret = ioctl(aia_fd, KVM_SET_DEVICE_ATTR, &aia_nr_sources_attr);
 	if (ret)
 		return ret;
-	aia_hart_bits = fls_long(kvm->nrcpus);
+	aia_hart_bits = fls_long(kvm->nrcpus - 1);
 	ret = ioctl(aia_fd, KVM_SET_DEVICE_ATTR, &aia_hart_bits_attr);
 	if (ret)
 		return ret;