9p: Add hypervisor configuration for 9p msize

This allows msize option for 9p to be configured and tuned. Fixes kata-containers#206 Signed-off-by: Archana Shinde <[email protected]>
amshinde · Apr 16, 2018 · 45a32f2 · 45a32f2
1 parent ad5669f
commit 45a32f2
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Showing 3 changed files with 10 additions and 0 deletions.
diff --git a/virtcontainers/hypervisor.go b/virtcontainers/hypervisor.go
@@ -226,6 +226,9 @@ type HypervisorConfig struct {
 	// DisableNestingChecks is used to override customizations performed
 	// when running on top of another VMM.
 	DisableNestingChecks bool
+
+	// Msize9p is used as the msize for 9p shares
+	Msize9p uint32
 }
 
 func (conf *HypervisorConfig) valid() (bool, error) {
@@ -257,6 +260,10 @@ func (conf *HypervisorConfig) valid() (bool, error) {
 		conf.DefaultMaxVCPUs = defaultMaxQemuVCPUs
 	}
 
+	if conf.Msize9p == 0 {
+		conf.Msize9p = defaultMsize9p
+	}
+
 	return true, nil
 }
 

diff --git a/virtcontainers/kata_agent.go b/virtcontainers/kata_agent.go
@@ -485,6 +485,8 @@ func (k *kataAgent) startSandbox(sandbox Sandbox) error {
 		}
 	}
 
+	sharedDir9pOptions = append(sharedDir9pOptions, fmt.Sprintf("msize=%d", sandbox.config.HypervisorConfig.Msize9p))
+
 	// We mount the shared directory in a predefined location
 	// in the guest.
 	// This is where at least some of the host config files

diff --git a/virtcontainers/qemu_arch_base.go b/virtcontainers/qemu_arch_base.go
@@ -108,6 +108,7 @@ const (
 	defaultCPUModel         = "host"
 	defaultBridgeBus        = "pcie.0"
 	maxDevIDSize            = 31
+	defaultMsize9p          = 8192
 )
 
 const (