forked from rpms/qemu-kvm
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63 lines
2.5 KiB
63 lines
2.5 KiB
From 2b2dfff3e383c99d0f759a8c12659d1a0ce50e8e Mon Sep 17 00:00:00 2001
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From: Isaku Yamahata <isaku.yamahata@intel.com>
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Date: Thu, 29 Feb 2024 01:36:55 -0500
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Subject: [PATCH 036/100] kvm/tdx: Ignore memory conversion to shared of
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unassigned region
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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RH-MergeRequest: 245: SEV-SNP support
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RH-Jira: RHEL-39544
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Bandan Das <bdas@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Commit: [36/91] 84515b9dcfc2e07b272bb2477acf6430e9d33f28 (bonzini/rhel-qemu-kvm)
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TDX requires vMMIO region to be shared. For KVM, MMIO region is the region
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which kvm memslot isn't assigned to (except in-kernel emulation).
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qemu has the memory region for vMMIO at each device level.
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While OVMF issues MapGPA(to-shared) conservatively on 32bit PCI MMIO
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region, qemu doesn't find corresponding vMMIO region because it's before
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PCI device allocation and memory_region_find() finds the device region, not
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PCI bus region. It's safe to ignore MapGPA(to-shared) because when guest
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accesses those region they use GPA with shared bit set for vMMIO. Ignore
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memory conversion request of non-assigned region to shared and return
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success. Otherwise OVMF is confused and panics there.
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Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
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Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
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Message-ID: <20240229063726.610065-35-xiaoyao.li@intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 565f4768bb9cf840b2f8cca41483bb91aa3196a3)
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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---
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accel/kvm/kvm-all.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
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index 6efaff90a7..f6268855b4 100644
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--- a/accel/kvm/kvm-all.c
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+++ b/accel/kvm/kvm-all.c
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@@ -2923,6 +2923,18 @@ int kvm_convert_memory(hwaddr start, hwaddr size, bool to_private)
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section = memory_region_find(get_system_memory(), start, size);
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mr = section.mr;
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if (!mr) {
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+ /*
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+ * Ignore converting non-assigned region to shared.
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+ *
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+ * TDX requires vMMIO region to be shared to inject #VE to guest.
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+ * OVMF issues conservatively MapGPA(shared) on 32bit PCI MMIO region,
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+ * and vIO-APIC 0xFEC00000 4K page.
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+ * OVMF assigns 32bit PCI MMIO region to
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+ * [top of low memory: typically 2GB=0xC000000, 0xFC00000)
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+ */
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+ if (!to_private) {
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+ return 0;
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+ }
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return -1;
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}
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--
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2.39.3
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