linux-kernel - [PATCH 3/6] hv: Set the correct EOM register in case of nested hypervisor

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Date:   Wed,  2 Nov 2022 14:00:14 +0000
From:   Jinank Jain <jinankjain@...ux.microsoft.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, arnd@...db.de, peterz@...radead.org,
        jpoimboe@...nel.org, jinankjain@...ux.microsoft.com,
        seanjc@...gle.com, kirill.shutemov@...ux.intel.com,
        ak@...ux.intel.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH 3/6] hv: Set the correct EOM register in case of nested hypervisor

Currently we are using the default EOM register value. But this needs to
changes when running under nested MSHV setup.

Signed-off-by: Jinank Jain <jinankjain@...ux.microsoft.com>
---
 include/asm-generic/mshyperv.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 49d2e9274379..7256e2cb7b67 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -117,6 +117,8 @@ static inline u64 hv_generate_guest_id(u64 kernel_version)
 
 extern bool hv_nested;
 
+#define REG_EOM (hv_nested ? HV_REGISTER_NESTED_EOM : HV_REGISTER_EOM)
+
 /* Free the message slot and signal end-of-message if required */
 static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 {
@@ -148,7 +150,7 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
 		 * possibly deliver another msg from the
 		 * hypervisor
 		 */
-		hv_set_register(HV_REGISTER_EOM, 0);
+		hv_set_register(REG_EOM, 0);
 	}
 }
 
-- 
2.25.1