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[Qemu-devel] [PATCH 18/17] kvm: Flush coalesced mmio buffer on IO window
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [PATCH 18/17] kvm: Flush coalesced mmio buffer on IO window exits |
Date: |
Mon, 03 Jan 2011 13:44:11 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
From: Jan Kiszka <address@hidden>
We must flush pending mmio writes if we leave kvm_cpu_exec for an IO
window. Otherwise we risk to loose those requests when migrating to a
different host during that window.
Signed-off-by: Jan Kiszka <address@hidden>
---
kvm-all.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kvm-all.c b/kvm-all.c
index 15d5f32..766a3a7 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -844,6 +844,8 @@ void kvm_cpu_exec(CPUState *env)
cpu_single_env = env;
kvm_arch_post_run(env, run);
+ kvm_flush_coalesced_mmio_buffer();
+
if (ret == -EINTR || ret == -EAGAIN) {
cpu_exit(env);
DPRINTF("io window exit\n");
@@ -856,8 +858,6 @@ void kvm_cpu_exec(CPUState *env)
abort();
}
- kvm_flush_coalesced_mmio_buffer();
-
ret = 0; /* exit loop */
switch (run->exit_reason) {
case KVM_EXIT_IO:
- [Qemu-devel] [PATCH v2 10/17] kvm: x86: Refactor msr_star/hsave_pa setup and checks, (continued)
[Qemu-devel] [PATCH v2 12/17] kvm: x86: Drop MCE MSRs write back restrictions, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 02/17] kvm: Drop return value of kvm_cpu_exec, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 03/17] kvm: Stop on all fatal exit reasons, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 04/17] kvm: Improve reporting of fatal errors, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH 18/17] kvm: Flush coalesced mmio buffer on IO window exits,
Jan Kiszka <=
[Qemu-devel] Re: [PATCH v2 00/17] [uq/master] Prepare for more qemu-kvm merging, Avi Kivity, 2011/01/03