[Qemu-devel] [PATCH v1 5/6] kvm/x86: Skip SynIC vector check for QEMU side

[Andrey Smetanin]

QEMU zero-inits Hyper-V SynIC vectors. We should allow that,
and don't reject zero values if set by the host.

Signed-off-by: Andrey Smetanin <address@hidden>
Reviewed-by: Roman Kagan <address@hidden>
CC: Gleb Natapov <address@hidden>
CC: Paolo Bonzini <address@hidden>
CC: Roman Kagan <address@hidden>
CC: Denis V. Lunev <address@hidden>
CC: address@hidden
---
 arch/x86/kvm/hyperv.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index b203ce3..d7e6651 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -72,12 +72,13 @@ static bool synic_has_vector_auto_eoi(struct 
kvm_vcpu_hv_synic *synic,
        return false;
 }
 
-static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, u64 data)
+static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
+                         u64 data, bool host)
 {
        int vector;
 
        vector = data & HV_SYNIC_SINT_VECTOR_MASK;
-       if (vector < 16)
+       if (vector < 16 && !host)
                return 1;
        /*
         * Guest may configure multiple SINTs to use the same vector, so
@@ -247,7 +248,7 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
                break;
        }
        case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
-               ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data);
+               ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
                break;
        default:
                ret = 1;
-- 
2.4.3