[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 8/8] kvm: Switch to unlocked MMIO
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 8/8] kvm: Switch to unlocked MMIO |
Date: |
Wed, 18 Mar 2015 14:21:49 +0100 |
Do not take the BQL before dispatching MMIO requests of KVM VCPUs.
Instead, call the unlocked version of address_space_rw. This enables
completely BQL-free MMIO handling in KVM mode for upcoming devices with
fine-grained locking.
Signed-off-by: Paolo Bonzini <address@hidden>
---
kvm-all.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/kvm-all.c b/kvm-all.c
index 2848e5b..fa0cfed 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1813,12 +1813,11 @@ int kvm_cpu_exec(CPUState *cpu)
break;
case KVM_EXIT_MMIO:
DPRINTF("handle_mmio\n");
- qemu_mutex_lock_iothread();
- cpu_physical_memory_rw(run->mmio.phys_addr,
- run->mmio.data,
- run->mmio.len,
- run->mmio.is_write);
- qemu_mutex_unlock_iothread();
+ address_space_rw_unlocked(&address_space_memory,
+ run->mmio.phys_addr,
+ run->mmio.data,
+ run->mmio.len,
+ run->mmio.is_write);
ret = 0;
break;
case KVM_EXIT_IRQ_WINDOW_OPEN:
--
2.3.0
- [Qemu-devel] [PATCH for-2.4 0/8] memory: enable unlocked PIO/MMIO in KVM, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 1/8] memory: Add global-locking property to memory regions, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 3/8] memory: Provide address_space_rw_unlocked, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 2/8] exec: move rcu_read_lock/unlock to address_space_translate callers, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 4/8] kvm: First step to push iothread lock out of inner run loop, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 6/8] exec: mark unassigned_io_ops as unlocked, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 7/8] acpi: mark PMTIMER as unlocked, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 5/8] kvm: Switch to unlocked PIO, Paolo Bonzini, 2015/03/18
- [Qemu-devel] [PATCH 8/8] kvm: Switch to unlocked MMIO,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH for-2.4 0/8] memory: enable unlocked PIO/MMIO in KVM, Jan Kiszka, 2015/03/18