diff mbox series

[RFC,kvmtool,28/31] arm64: realm: Enforce virtio F_ACCESS_PLATFORM flag

Message ID 20230127113932.166089-29-suzuki.poulose@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Support for Arm Confidential Compute Architecture | expand

Commit Message

Suzuki K Poulose Jan. 27, 2023, 11:39 a.m. UTC 
For realms, force the F_ACCESS_PLATFORM flag to ensure DMA-APIs
are triggered for virtio in Linux

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arm/aarch64/kvm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index a4664237..1f3a0def 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -5,6 +5,7 @@ 
 #include <linux/byteorder.h>
 #include <linux/cpumask.h>
 #include <linux/sizes.h>
+#include <linux/virtio_config.h>
 
 #include <kvm/util.h>
 
@@ -237,5 +238,10 @@  void kvm__arch_enable_mte(struct kvm *kvm)
 
 u64 kvm__arch_get_virtio_host_features(struct kvm *kvm)
 {
-	return 0;
+	u64 features = 0;
+
+	/* Enforce F_ACCESS_PLATFORM for Realms */
+	if (kvm->cfg.arch.is_realm)
+		features |= (1ULL << VIRTIO_F_ACCESS_PLATFORM);
+	return features;
 }