[v1] target/riscv/kvm: QEMU support for KVM Guest Debug on RISC-V

[RFC PATCH 2/4] target/riscv/kvm: implement kvm_arch_update_guest_debug()

Chao Du posted 4 patches 11 months, 1 week ago

Diff against v1 v2 v2 v3 v4
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Maintainers: Paolo Bonzini <pbonzini@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Marcelo Tosatti <mtosatti@redhat.com>, Huacai Chen <chenhuacai@kernel.org>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Weiwei Li <liwei1518@gmail.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>

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[RFC PATCH 2/4] target/riscv/kvm: implement kvm_arch_update_guest_debug()

Posted by Chao Du 11 months, 1 week ago

Set the control flag when there are active breakpoints. This will
help KVM to know the status in the userspace.

Signed-off-by: Chao Du <duchao@eswincomputing.com>
---
 target/riscv/kvm/kvm-cpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index e9110006b0..94697b09bb 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1598,5 +1598,7 @@ void kvm_arch_remove_all_hw_breakpoints(void)
 
 void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
 {
-    /* TODO; To be implemented later. */
+    if (kvm_sw_breakpoints_active(cs)) {
+        dbg->control |= KVM_GUESTDBG_ENABLE;
+    }
 }
-- 
2.17.1

[RFC PATCH 1/4] target/riscv/kvm: add software breakpoints support
[RFC PATCH 2/4] target/riscv/kvm: implement kvm_arch_update_guest_debug()
[RFC PATCH 3/4] target/riscv/kvm: handle the exit with debug reason
[RFC PATCH 4/4] linux-headers: enable KVM GUEST DEBUG for RISC-V