In some scene, e.g openstack CI, PR guest can trigger sc 1 frequently,
this patch optimizes the path by directly delivering BOOK3S_INTERRUPT_SYSCALL
to HV guest, so powernv can return to HV guest without heavy exit, i.e,
no need to swap TLB, HTAB,.. etc
Signed-off-by: Liu Ping Fan
Since kvmppc_hv_find_lock_hpte() is called from both virtmode and
realmode, so it can trigger the deadlock.
Suppose the following scene:
Two physical cpuM, cpuN, two VM instances A, B, each VM has a group of
vcpus.
If on cpuM, vcpu_A_1 holds bitlock X (HPTE_V_HVLOCK), then is switched
out, and
On Fri, 2013-11-15 at 11:01 +0530, Bharat Bhushan wrote:
@@ -440,9 +437,9 @@ static inline int kvmppc_e500_shadow_map(struct
kvmppc_vcpu_e500 *vcpu_e500,
}
if (likely(!pfnmap)) {
- unsigned long tsize_pages = 1 (tsize + 10 - PAGE_SHIFT);
+ tsize_pages
Some users have reported instances of the host hanging with secondary
threads of a core waiting for the primary thread to exit the guest,
and the primary thread stuck in nap mode. This prompted a review of
the memory barriers in the guest entry/exit code, and this is the
result. Most of these
Lockdep reported that there is a potential for deadlock because
vcpu-arch.tbacct_lock is not irq-safe, and is sometimes taken inside
the rq_lock (run-queue lock) in the scheduler, which is taken within
interrupts. The lockdep splat looks like:
On Fri, Nov 15, 2013 at 04:35:01PM +0800, Liu Ping Fan wrote:
+sc_1_fast_return:
+ mtspr SPRN_SRR0,r10
+ mtspr SPRN_SRR1,r11
+ li r10, BOOK3S_INTERRUPT_SYSCALL
+ li r11, (MSR_ME 1) | 1 /* synthesize MSR_SF | MSR_ME */
+ rotldi r11, r11, 63
You need a
