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53 lines
1.9 KiB
53 lines
1.9 KiB
1 year ago
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From f9d982fae156aa9db0506e1e098c1e8a7f7eec94 Mon Sep 17 00:00:00 2001
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From: Bandan Das <bsd@redhat.com>
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Date: Thu, 3 Aug 2023 14:29:15 -0400
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Subject: [PATCH 13/14] i386/cpu: Update how the EBX register of CPUID
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0x8000001F is set
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RH-Author: Bandan Das <None>
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RH-MergeRequest: 196: Updates to SEV reduced-phys-bits parameter
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RH-Bugzilla: 2214839
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [4/4] efc368b2c844fd4fbc3c755a5e2da288329e7a2c (bdas1/qemu-kvm)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2214839
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commit fb6bbafc0f19385fb257ee073ed13dcaf613f2f8
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Author: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Fri Sep 30 10:14:30 2022 -0500
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i386/cpu: Update how the EBX register of CPUID 0x8000001F is set
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Update the setting of CPUID 0x8000001F EBX to clearly document the ranges
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associated with fields being set.
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Fixes: 6cb8f2a663 ("cpu/i386: populate CPUID 0x8000_001F when SEV is active")
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-Id: <5822fd7d02b575121380e1f493a8f6d9eba2b11a.1664550870.git.thomas.lendacky@amd.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Bandan Das <bsd@redhat.com>
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---
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target/i386/cpu.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 839706b430..4ac3046313 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -6008,8 +6008,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
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if (sev_enabled()) {
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*eax = 0x2;
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*eax |= sev_es_enabled() ? 0x8 : 0;
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- *ebx = sev_get_cbit_position();
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- *ebx |= sev_get_reduced_phys_bits() << 6;
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+ *ebx = sev_get_cbit_position() & 0x3f; /* EBX[5:0] */
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+ *ebx |= (sev_get_reduced_phys_bits() & 0x3f) << 6; /* EBX[11:6] */
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}
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break;
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default:
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--
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2.39.3
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