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Message-Id: <b8c847e84fd298abb25047b305ee76be13bea1b0.1605232743.git.isaku.yamahata@intel.com>
Date: Mon, 16 Nov 2020 10:26:08 -0800
From: isaku.yamahata@...el.com
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, x86@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [RFC PATCH 23/67] KVM: Add per-VM flag to disable dirty logging of memslots for TDs
From: Sean Christopherson <sean.j.christopherson@...el.com>
Add a flag for TDX to mark dirty logging as unsupported.
Suggested-by: Kai Huang <kai.huang@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1a0df7b83fd0..9682282cb258 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -517,6 +517,7 @@ struct kvm {
pid_t userspace_pid;
unsigned int max_halt_poll_ns;
+ bool dirty_log_unsupported;
#ifdef __KVM_HAVE_READONLY_MEM
bool readonly_mem_unsupported;
#endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 572a66a61c29..aa5f27753756 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1103,7 +1103,10 @@ static void update_memslots(struct kvm_memslots *slots,
static int check_memory_region_flags(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem)
{
- u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
+ u32 valid_flags = 0;
+
+ if (!kvm->dirty_log_unsupported)
+ valid_flags |= KVM_MEM_LOG_DIRTY_PAGES;
#ifdef __KVM_HAVE_READONLY_MEM
if (!kvm->readonly_mem_unsupported)
--
2.17.1
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