linux-kernel - [PATCH RFC v15 18/30] virt: gunyah: Add IO handlers

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Message-ID: <20231215-gunyah-v15-18-192a5d872a30@quicinc.com>
Date: Fri, 15 Dec 2023 16:20:59 -0800
From: Elliot Berman <quic_eberman@...cinc.com>
To: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri
	<quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu
	<quic_pheragu@...cinc.com>,
        Jonathan Corbet <corbet@....net>, Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Elliot Berman
	<quic_eberman@...cinc.com>
Subject: [PATCH RFC v15 18/30] virt: gunyah: Add IO handlers

Add framework for VM functions to handle stage-2 write faults from Gunyah
guest virtual machines. IO handlers have a range of addresses which they
apply to. Optionally, they may apply to only when the value written
matches the IO handler's value.

Reviewed-by: Alex Elder <elder@...aro.org>
Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>
Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
---
 drivers/virt/gunyah/vm_mgr.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
index d2f6ac212169..5d1ebce678ad 100644
--- a/drivers/virt/gunyah/vm_mgr.h
+++ b/drivers/virt/gunyah/vm_mgr.h
@@ -74,4 +74,6 @@ int gunyah_vm_provide_folio(struct gunyah_vm *ghvm, struct folio *folio,
 int gunyah_vm_reclaim_folio(struct gunyah_vm *ghvm, u64 gfn);
 void gunyah_vm_reclaim_memory(struct gunyah_vm *ghvm);
 
+int gunyah_vm_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data);
+
 #endif

-- 
2.43.0