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[Qemu-devel] [PATCH 23/35] kvm: x86: Reset paravirtual MSRs
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [PATCH 23/35] kvm: x86: Reset paravirtual MSRs |
Date: |
Thu, 6 Jan 2011 15:56:29 -0200 |
From: Jan Kiszka <address@hidden>
Make sure to write the cleared MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
and MSR_KVM_ASYNC_PF_EN to the kernel state so that a freshly booted
guest cannot be disturbed by old values.
Signed-off-by: Jan Kiszka <address@hidden>
CC: Glauber Costa <address@hidden>
Signed-off-by: Marcelo Tosatti <address@hidden>
---
target-i386/kvm.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index d8f26bf..8267655 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -845,6 +845,13 @@ static int kvm_put_msrs(CPUState *env, int level)
if (smp_cpus == 1 || env->tsc != 0) {
kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
}
+ }
+ /*
+ * The following paravirtual MSRs have side effects on the guest or are
+ * too heavy for normal writeback. Limit them to reset or full state
+ * updates.
+ */
+ if (level >= KVM_PUT_RESET_STATE) {
kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
env->system_time_msr);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
--
1.7.2.3
- [Qemu-devel] [PATCH 00/35] [PULL] qemu-kvm.git uq/master queue, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 19/35] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 29/35] kvm: Drop smp_cpus argument from init functions, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 08/35] kvm: introduce kvm_inject_x86_mce_on, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 01/35] kvm: Enable user space NMI injection for kvm guest, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 30/35] kvm: Consolidate must-have capability checks, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 09/35] kvm: x86: Fix DPL write back of segment registers, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 34/35] kvm: x86: Implicitly clear nmi_injected/pending on reset, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 11/35] kvm: x86: Prevent sign extension of DR7 in guest debugging mode, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 23/35] kvm: x86: Reset paravirtual MSRs,
Marcelo Tosatti <=
- [Qemu-devel] [PATCH 32/35] kvm: Flush coalesced mmio buffer on IO window exits, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 22/35] kvm: x86: Refactor msr_star/hsave_pa setup and checks, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 02/35] kvm: convert kvm_ioctl(KVM_CHECK_EXTENSION) to kvm_check_extension(), Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 27/35] kvm: x86: Fix !CONFIG_KVM_PARA build, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 20/35] kvm: x86: Remove redundant mp_state initialization, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 13/35] kvm: Fix coding style violations, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 35/35] kvm: x86: Only read/write MSR_KVM_ASYNC_PF_EN if supported, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 24/35] Synchronize VCPU states before reset, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 10/35] kvm: x86: Remove obsolete SS.RPL/DPL aligment, Marcelo Tosatti, 2011/01/06
- [Qemu-devel] [PATCH 14/35] kvm: Drop return value of kvm_cpu_exec, Marcelo Tosatti, 2011/01/06