From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 11 Oct 2024 08:39:58 +0000 (+0200)
Subject: accel/kvm: check for KVM_CAP_MEMORY_ATTRIBUTES on vm
X-Git-Tag: v9.2.0-rc0~44^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=586d708c1e3e5e29a0b3c05c347290aed9478854;p=thirdparty%2Fqemu.git

accel/kvm: check for KVM_CAP_MEMORY_ATTRIBUTES on vm

The exact set of available memory attributes can vary by VM.  In the
future it might vary depending on enabled capabilities, too.  Query the
extension on the VM level instead of on the KVM level, and only after
architecture-specific initialization.

Inspired by an analogous patch by Tom Dohrmann.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index d985486a053..801cff16a5a 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2604,12 +2604,6 @@ static int kvm_init(MachineState *ms)
         goto err;
     }
 
-    kvm_supported_memory_attributes = kvm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
-    kvm_guest_memfd_supported =
-        kvm_check_extension(s, KVM_CAP_GUEST_MEMFD) &&
-        kvm_check_extension(s, KVM_CAP_USER_MEMORY2) &&
-        (kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE);
-
     kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
     s->nr_slots_max = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
 
@@ -2723,6 +2717,12 @@ static int kvm_init(MachineState *ms)
         goto err;
     }
 
+    kvm_supported_memory_attributes = kvm_vm_check_extension(s, KVM_CAP_MEMORY_ATTRIBUTES);
+    kvm_guest_memfd_supported =
+        kvm_check_extension(s, KVM_CAP_GUEST_MEMFD) &&
+        kvm_check_extension(s, KVM_CAP_USER_MEMORY2) &&
+        (kvm_supported_memory_attributes & KVM_MEMORY_ATTRIBUTE_PRIVATE);
+
     if (s->kernel_irqchip_split == ON_OFF_AUTO_AUTO) {
         s->kernel_irqchip_split = mc->default_kernel_irqchip_split ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
     }