linux-kernel - [RFC V2 33/37] kvm, x86: enable record_steal

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Message-Id: <f5a43fcef278efcf6b2e138644160cf806d5dc51.1607332046.git.yuleixzhang@tencent.com>
Date:   Mon,  7 Dec 2020 19:31:26 +0800
From:   yulei.kernel@...il.com
To:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, naoya.horiguchi@....com,
        viro@...iv.linux.org.uk, pbonzini@...hat.com
Cc:     joao.m.martins@...cle.com, rdunlap@...radead.org,
        sean.j.christopherson@...el.com, xiaoguangrong.eric@...il.com,
        kernellwp@...il.com, lihaiwei.kernel@...il.com,
        Yulei Zhang <yuleixzhang@...cent.com>
Subject: [RFC V2 33/37] kvm, x86: enable record_steal_time for dmem

From: Yulei Zhang <yuleixzhang@...cent.com>

Adjust the kvm_map_gfn while using dmemfs to enable
record_steal_time when entering the guest.

Signed-off-by: Yulei Zhang <yuleixzhang@...cent.com>
---
 virt/kvm/kvm_main.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2541a17..500b170 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -51,6 +51,7 @@
 #include <linux/io.h>
 #include <linux/lockdep.h>
 #include <linux/kthread.h>
+#include <linux/dmem.h>
 
 #include <asm/processor.h>
 #include <asm/ioctl.h>
@@ -2164,7 +2165,10 @@ static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn,
 			hva = kmap(page);
 #ifdef CONFIG_HAS_IOMEM
 	} else if (!atomic) {
-		hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
+		if (is_dmem_pfn(pfn))
+			hva = __va(PFN_PHYS(pfn));
+		else
+			hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB);
 	} else {
 		return -EINVAL;
 #endif
@@ -2214,9 +2218,10 @@ static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot,
 			kunmap(map->page);
 	}
 #ifdef CONFIG_HAS_IOMEM
-	else if (!atomic)
-		memunmap(map->hva);
-	else
+	else if (!atomic) {
+		if (!is_dmem_pfn(map->pfn))
+			memunmap(map->hva);
+	} else
 		WARN_ONCE(1, "Unexpected unmapping in atomic context");
 #endif
 
-- 
1.8.3.1