From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org,
hpa@zytor.com, arnd@arndb.de, Neeraj.Upadhyay@amd.com,
tiala@microsoft.com, kvijayab@amd.com,
romank@linux.microsoft.com
Cc: linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org,
Michael Kelley <mhklinux@outlook.com>
Subject: [PATCH 3/5] x86/hyperv: Don't use auto-eoi when Secure AVIC is available
Date: Thu, 18 Sep 2025 11:00:21 -0400 [thread overview]
Message-ID: <20250918150023.474021-4-tiala@microsoft.com> (raw)
In-Reply-To: <20250918150023.474021-1-tiala@microsoft.com>
Hyper-V doesn't support auto-eoi with Secure AVIC.
So set the HV_DEPRECATING_AEOI_RECOMMENDED flag
to force writing the EOI register after handling an interrupt.
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
arch/x86/kernel/cpu/mshyperv.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index c78f860419d6..6dd3ae66a646 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -464,6 +464,9 @@ static void __init ms_hyperv_init_platform(void)
hv_identify_partition_type();
+ if (cc_platform_has(CC_ATTR_SNP_SECURE_AVIC))
+ ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED;
+
if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) {
hv_nested = true;
pr_info("Hyper-V: running on a nested hypervisor\n");
--
2.25.1
next prev parent reply other threads:[~2025-09-18 15:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 15:00 [PATCH 0/5] x86/Hyper-V: Add AMD Secure AVIC for Hyper-V platform Tianyu Lan
2025-09-18 15:00 ` [PATCH 1/5] x86/hyperv: Don't use hv apic driver when Secure AVIC is available Tianyu Lan
2025-09-18 15:00 ` [PATCH 2/5] drivers: hv: Allow vmbus message synic interrupt injected from Hyper-V Tianyu Lan
2025-09-18 15:00 ` Tianyu Lan [this message]
2025-09-18 15:00 ` [PATCH 4/5] x86/hyperv: Allow Hyper-V to inject STIMER0 interrupts Tianyu Lan
2025-09-18 15:00 ` [PATCH 5/5] x86/Hyper-V: Add Hyper-V specific hvcall to set backing page Tianyu Lan
2025-09-18 15:09 ` Borislav Petkov
2025-09-18 17:11 ` Tianyu Lan
2025-09-18 19:59 ` Borislav Petkov
2025-09-30 23:05 ` [PATCH 0/5] x86/Hyper-V: Add AMD Secure AVIC for Hyper-V platform Wei Liu
2025-10-13 17:18 ` Wei Liu
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