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Re: [RFC PATCH v2 02/44] kvm: Switch KVM_CAP_READONLY_MEM to a per-VM io


From: Connor Kuehl
Subject: Re: [RFC PATCH v2 02/44] kvm: Switch KVM_CAP_READONLY_MEM to a per-VM ioctl()
Date: Thu, 22 Jul 2021 12:52:35 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 7/7/21 7:54 PM, isaku.yamahata@gmail.com wrote:
From: Isaku Yamahata <isaku.yamahata@intel.com>

Switch to making a VM ioctl() call for KVM_CAP_READONLY_MEM, which may
be conditional on VM type in recent versions of KVM, e.g. when TDX is
supported.

kvm_vm_check_extension() has fallback from kvm_vm_ioctl() to
kvm_check_extension(). fallback from VM ioctl to System ioctl for
compatibility for old kernel.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
  accel/kvm/kvm-all.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index e5b10dd129..fdbe24bf59 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2531,7 +2531,7 @@ static int kvm_init(MachineState *ms)
      }
kvm_readonly_mem_allowed =
-        (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
+        (kvm_vm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
kvm_eventfds_allowed =
          (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);


Reviewed-by: Connor Kuehl <ckuehl@redhat.com>




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