On Tue, Mar 22, 2022 at 04:06:51PM +0800, Gavin Shan wrote:
This supports SDEI_VERSION hypercall by returning v1.1, which is
the specification version we're following. The vendor is set to
'KVM'.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 8a9b477b8977..5a3a64cd6e84 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -118,6 +118,14 @@ static bool remove_all_vcpu_events(struct kvm_vcpu *vcpu,
return pending;
}
+static unsigned long hypercall_version(struct kvm_vcpu *vcpu)
+{
+ /* v1.1 and the vendor is KVM */
+ return (1UL << SDEI_VERSION_MAJOR_SHIFT) |
+ (1UL << SDEI_VERSION_MINOR_SHIFT) |
+ 0x4b564d;
It looks like the SDEI specification states that the vendor-defined
version number is 32 bits. Could we just use one of the
ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_{0,3} values instead?
ASCII 'KVM' is neat, but in reality guest software will just throw it in
a macro regardless. Might as well use one of the values we've already
trained it to use :-)
Also, it would appear that guest discovery of SDEI relies upon KVM
reporting a valid SDEI version. IMO, this patch should come at the very
end when KVM actually implements SDEI.