x86/hyperv: Don't use auto-eoi when Secure AVIC is available

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>
Signed-off-by: Wei Liu <wei.liu@kernel.org>

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index c4febdbcfe4d8a0177fccbfdba020f22e22b5457..217a41b63df36045afa5a2fbb0f617ff97512445 100644 (file)
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -470,6 +470,9 @@ 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");