On 31/8/23 10:42, Andrew Jones wrote:
On Wed, Aug 30, 2023 at 10:35:02AM -0300, Daniel Henrique Barboza wrote:
A build with --enable-debug and without KVM will fail as follows:
/usr/bin/ld: libqemu-riscv64-softmmu.fa.p/hw_riscv_virt.c.o: in function
`virt_machine_init':
./qemu/build/../hw/riscv/virt.c:1465: undefined reference to
`kvm_riscv_aia_create'
This happens because the code block with "if virt_use_kvm_aia(s)" isn't
being ignored by the debug build, resulting in an undefined reference to
a KVM only function.
Add a 'kvm_enabled()' conditional together with virt_use_kvm_aia() will
make the compiler crop the kvm_riscv_aia_create() call entirely from a
non-KVM build. Note that adding the 'kvm_enabled()' conditional inside
virt_use_kvm_aia() won't fix the build because this function would need
to be inlined multiple times to make the compiler zero out the entire
block.
While we're at it, use kvm_enabled() in all instances where
virt_use_kvm_aia() is checked to allow the compiler to elide these other
kvm-only instances as well.
Suggested-by: Richard Henderson <richard.hender...@linaro.org>
Fixes: dbdb99948e ("target/riscv: select KVM AIA in riscv virt machine")
Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
---
hw/riscv/virt.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
I think I'd prefer
/* We need this inlined for debug (-O0) builds */
static inline QEMU_ALWAYS_INLINE bool virt_use_kvm_aia(RISCVVirtState *s)
{
return kvm_enabled() && kvm_irqchip_in_kernel() && s->aia_type ==
VIRT_AIA_TYPE_APLIC_IMSIC;
Generally we should know whether KVM is enabled or not _before_
calling any foo_kvm() code, not after.
}
