linux-kernel - [RFC PATCH 3/6] KVM: x86: add async ioctl support

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Message-ID: <20241118123948.4796-4-kalyazin@amazon.com>
Date: Mon, 18 Nov 2024 12:39:45 +0000
From: Nikita Kalyazin <kalyazin@...zon.com>
To: <pbonzini@...hat.com>, <seanjc@...gle.com>, <corbet@....net>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <hpa@...or.com>, <rostedt@...dmis.org>,
	<mhiramat@...nel.org>, <mathieu.desnoyers@...icios.com>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>
CC: <jthoughton@...gle.com>, <david@...hat.com>, <peterx@...hat.com>,
	<oleg@...hat.com>, <vkuznets@...hat.com>, <gshan@...hat.com>,
	<graf@...zon.de>, <jgowans@...zon.com>, <roypat@...zon.co.uk>,
	<derekmn@...zon.com>, <nsaenz@...zon.es>, <xmarcalx@...zon.com>,
	<kalyazin@...zon.com>
Subject: [RFC PATCH 3/6] KVM: x86: add async ioctl support

x86 has not had support for async ioctls.
This patch adds an arch implementation, but does not add any of the
ioctls just yet.

Signed-off-by: Nikita Kalyazin <kalyazin@...zon.com>
---
 arch/x86/kvm/Kconfig | 1 +
 arch/x86/kvm/x86.c   | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index ebd1ec6600bc..191dfba3e27a 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -46,6 +46,7 @@ config KVM
 	select KVM_GENERIC_HARDWARE_ENABLING
 	select KVM_WERROR if WERROR
 	select KVM_USERFAULT
+	select HAVE_KVM_VCPU_ASYNC_IOCTL
 	help
 	  Support hosting fully virtualized guest machines using hardware
 	  virtualization extensions.  You will need a fairly recent
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ba0ad76f53bc..800493739043 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13619,6 +13619,12 @@ void kvm_arch_gmem_invalidate(kvm_pfn_t start, kvm_pfn_t end)
 }
 #endif
 
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+			       unsigned int ioctl, unsigned long arg)
+{
+	return -ENOIOCTLCMD;
+}
+
 int kvm_spec_ctrl_test_value(u64 value)
 {
 	/*
-- 
2.40.1