81 lines
2.9 KiB
Diff
81 lines
2.9 KiB
Diff
From 25f3b21b6b1654d1ffde72e231a4635b5929a6a8 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 18 Jul 2025 18:03:48 +0200
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Subject: [PATCH 078/115] i386/tdx: Define supported KVM features for TDX
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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RH-MergeRequest: 391: TDX support, including attestation and device assignment
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RH-Jira: RHEL-15710 RHEL-20798 RHEL-49728
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RH-Acked-by: Yash Mankad <None>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Commit: [78/115] d0ab8e6f6795d750c9fd07bf19bec65078424075 (bonzini/rhel-qemu-kvm)
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For TDX, only limited KVM PV features are supported.
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Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
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Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
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Link: https://lore.kernel.org/r/20250508150002.689633-50-xiaoyao.li@intel.com
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 4d6e288a350a977b0fb0613db952087928ccd93e)
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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target/i386/kvm/tdx.c | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
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index f15ed51a32..32e03caf43 100644
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--- a/target/i386/kvm/tdx.c
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+++ b/target/i386/kvm/tdx.c
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@@ -32,6 +32,8 @@
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#include "kvm_i386.h"
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#include "tdx.h"
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+#include "standard-headers/asm-x86/kvm_para.h"
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+
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#define TDX_MIN_TSC_FREQUENCY_KHZ (100 * 1000)
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#define TDX_MAX_TSC_FREQUENCY_KHZ (10 * 1000 * 1000)
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@@ -44,6 +46,14 @@
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TDX_TD_ATTRIBUTES_PKS | \
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TDX_TD_ATTRIBUTES_PERFMON)
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+#define TDX_SUPPORTED_KVM_FEATURES ((1U << KVM_FEATURE_NOP_IO_DELAY) | \
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+ (1U << KVM_FEATURE_PV_UNHALT) | \
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+ (1U << KVM_FEATURE_PV_TLB_FLUSH) | \
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+ (1U << KVM_FEATURE_PV_SEND_IPI) | \
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+ (1U << KVM_FEATURE_POLL_CONTROL) | \
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+ (1U << KVM_FEATURE_PV_SCHED_YIELD) | \
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+ (1U << KVM_FEATURE_MSI_EXT_DEST_ID))
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+
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static TdxGuest *tdx_guest;
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static struct kvm_tdx_capabilities *tdx_caps;
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@@ -631,6 +641,14 @@ static void tdx_add_supported_cpuid_by_xfam(void)
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e->edx |= (tdx_caps->supported_xfam & CPUID_XSTATE_XSS_MASK) >> 32;
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}
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+static void tdx_add_supported_kvm_features(void)
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+{
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+ struct kvm_cpuid_entry2 *e;
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+
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+ e = find_in_supported_entry(0x40000001, 0);
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+ e->eax = TDX_SUPPORTED_KVM_FEATURES;
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+}
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+
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static void tdx_setup_supported_cpuid(void)
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{
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if (tdx_supported_cpuid) {
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@@ -647,6 +665,8 @@ static void tdx_setup_supported_cpuid(void)
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tdx_add_supported_cpuid_by_fixed1_bits();
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tdx_add_supported_cpuid_by_attrs();
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tdx_add_supported_cpuid_by_xfam();
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+
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+ tdx_add_supported_kvm_features();
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}
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static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
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--
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2.50.1
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