From: Gerd Hoffmann <kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>,
Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
Eduardo Habkost <eduardo@habkost.net>,
Paolo Bonzini <pbonzini@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Sergio Lopez <slp@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>
Subject: [PATCH 1/2] [hack] reserve bit KVM_HINTS_HOST_PHYS_BITS
Date: Wed, 31 Aug 2022 14:50:58 +0200 [thread overview]
Message-ID: <20220831125059.170032-2-kraxel@redhat.com> (raw)
In-Reply-To: <20220831125059.170032-1-kraxel@redhat.com>
The KVM_HINTS_HOST_PHYS_BITS bit indicates that qemu has host-phys-bits
turned on. This implies the guest can actually work with the full
available physical address space as advertised by CPUID(0x80000008).
Temporary hack for RfC patch and testing. This change must actually be
done in the linux kernel, then picked up by qemu via header file sync.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
include/standard-headers/asm-x86/kvm_para.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/standard-headers/asm-x86/kvm_para.h b/include/standard-headers/asm-x86/kvm_para.h
index f0235e58a1d3..105b958c0f56 100644
--- a/include/standard-headers/asm-x86/kvm_para.h
+++ b/include/standard-headers/asm-x86/kvm_para.h
@@ -37,7 +37,8 @@
#define KVM_FEATURE_HC_MAP_GPA_RANGE 16
#define KVM_FEATURE_MIGRATION_CONTROL 17
-#define KVM_HINTS_REALTIME 0
+#define KVM_HINTS_REALTIME 0
+#define KVM_HINTS_HOST_PHYS_BITS 1
/* The last 8 bits are used to indicate how to interpret the flags field
* in pvclock structure. If no bits are set, all flags are ignored.
--
2.37.2
next prev parent reply other threads:[~2022-08-31 12:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 12:50 [PATCH 0/2] expose host-phys-bits to guest Gerd Hoffmann
2022-08-31 12:50 ` Gerd Hoffmann [this message]
2022-08-31 13:05 ` [PATCH 1/2] [hack] reserve bit KVM_HINTS_HOST_PHYS_BITS Michael S. Tsirkin
2022-08-31 12:50 ` [PATCH 2/2] [RfC] expose host-phys-bits to guest Gerd Hoffmann
2022-08-31 12:58 ` Claudio Fontana
2022-09-01 6:07 ` [PATCH 0/2] " Xiaoyao Li
2022-09-01 13:58 ` Gerd Hoffmann
2022-09-01 14:36 ` Xiaoyao Li
2022-09-01 16:17 ` Gerd Hoffmann
2022-09-02 0:10 ` Xiaoyao Li
2022-09-02 6:07 ` Gerd Hoffmann
2022-09-02 6:35 ` Michael S. Tsirkin
2022-09-02 8:44 ` Gerd Hoffmann
2022-09-04 20:37 ` Michael S. Tsirkin
2022-09-05 7:39 ` Gerd Hoffmann
2022-09-01 14:55 ` Claudio Fontana
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