There are several reasons to discard shadow TLB.
1. After implement shadow ID support for E500,
keep shadow TLB may incur potential coherence problem.
(if shadow ID mappings change, shadow TLB cannot be updated intime)
2. We use shadow TLB restore hardware TLB in vcpu_load().
However, since after implement shadow ID there is no tlbia() in vcpu_put(),
it's no need to restore hardware TLB any more.
3. Discard shadow TLB saves a lot memory.
Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_e500.h | 9 +-
arch/powerpc/kvm/e500_tlb.c | 275 ++++++++++++-----------------------
2 files changed, 103 insertions(+), 181 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_e500.h b/arch/powerpc/include/asm/kvm_e500.h
index 9d497ce..b248f31 100644
--- a/arch/powerpc/include/asm/kvm_e500.h
+++ b/arch/powerpc/include/asm/kvm_e500.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
+ * Copyright (C) 2008 - 2009 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Yu Liu, <yu.liu@xxxxxxxxxxxxx>
*
@@ -29,13 +29,18 @@ struct tlbe{
u32 mas7;
};
+struct kvmppc_e500_shadow_ref {
+ struct page *page;
+ struct tlbe *gtlbe;
+};
+
struct kvmppc_vcpu_e500 {
/* Unmodified copy of the guest's TLB. */
struct tlbe *guest_tlb[E500_TLB_NUM];
/* TLB that's actually used when the guest is running. */
struct tlbe *shadow_tlb[E500_TLB_NUM];
/* Pages which are referenced in the shadow TLB. */
- struct page **shadow_pages[E500_TLB_NUM];
+ struct kvmppc_e500_shadow_ref *shadow_refs[E500_TLB_NUM];
unsigned int guest_tlb_size[E500_TLB_NUM];
unsigned int shadow_tlb_size[E500_TLB_NUM];
diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index 0e773fc..4952dba 100644
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
+ * Copyright (C) 2008 - 2009 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Yu Liu, yu.liu@xxxxxxxxxxxxx
*
@@ -46,17 +46,6 @@ void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
tlbe->mas3, tlbe->mas7);
}
}
-
- for (tlbsel = 0; tlbsel < 2; tlbsel++) {
- printk("Shadow TLB%d:\n", tlbsel);
- for (i = 0; i < vcpu_e500->shadow_tlb_size[tlbsel]; i++) {
- tlbe = &vcpu_e500->shadow_tlb[tlbsel][i];
- if (tlbe->mas1 & MAS1_VALID)
- printk(" S[%d][%3d] | %08X | %08X | %08X | %08X |\n",
- tlbsel, i, tlbe->mas1, tlbe->mas2,
- tlbe->mas3, tlbe->mas7);
- }
- }
}
static inline unsigned int tlb0_get_next_victim(
@@ -119,10 +108,8 @@ static inline void __write_host_tlbe(struct tlbe *stlbe)
}
static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
- int tlbsel, int esel)
+ int tlbsel, int esel, struct tlbe *stlbe)
{
- struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
-
local_irq_disable();
if (tlbsel == 0) {
__write_host_tlbe(stlbe);
@@ -137,28 +124,13 @@ static inline void write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
mtspr(SPRN_MAS0, mas0);
}
local_irq_enable();
+ KVMTRACE_5D(STLB_WRITE, &vcpu_e500->vcpu, index_of(tlbsel, esel),
+ stlbe->mas1, stlbe->mas2, stlbe->mas3, stlbe->mas7,
+ handler);
}
void kvmppc_e500_tlb_load(struct kvm_vcpu *vcpu, int cpu)
{
- struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
- int i;
- unsigned register mas0;
-
- /* Load all valid TLB1 entries to reduce guest tlb miss fault */
- local_irq_disable();
- mas0 = mfspr(SPRN_MAS0);
- for (i = 0; i < tlb1_max_shadow_size(); i++) {
- struct tlbe *stlbe = &vcpu_e500->shadow_tlb[1][i];
-
- if (get_tlb_v(stlbe)) {
- mtspr(SPRN_MAS0, MAS0_TLBSEL(1)
- | MAS0_ESEL(to_htlb1_esel(i)));
- __write_host_tlbe(stlbe);
- }
- }
- mtspr(SPRN_MAS0, mas0);
- local_irq_enable();
}
void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu)
@@ -200,16 +172,19 @@ static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
}
static void kvmppc_e500_shadow_release(struct kvmppc_vcpu_e500 *vcpu_e500,
- int tlbsel, int esel)
+ int stlbsel, int sesel)
{
- struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
- struct page *page = vcpu_e500->shadow_pages[tlbsel][esel];
+ struct kvmppc_e500_shadow_ref *ref;
+ struct page *page;
+
+ ref = &vcpu_e500->shadow_refs[stlbsel][sesel];
+ page = ref->page;
if (page) {
- vcpu_e500->shadow_pages[tlbsel][esel] = NULL;
+ ref->page = NULL;
- if (get_tlb_v(stlbe)) {
- if (tlbe_is_writable(stlbe))
+ if (get_tlb_v(ref->gtlbe)) {
+ if (tlbe_is_writable(ref->gtlbe))
kvm_release_page_dirty(page);
else
kvm_release_page_clean(page);
@@ -217,44 +192,19 @@ static void kvmppc_e500_shadow_release(struct kvmppc_vcpu_e500 *vcpu_e500,
}
}
-static void kvmppc_e500_stlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
- int tlbsel, int esel)
-{
- struct tlbe *stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
-
- kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
- stlbe->mas1 = 0;
- KVMTRACE_5D(STLB_INVAL, &vcpu_e500->vcpu, index_of(tlbsel, esel),
- stlbe->mas1, stlbe->mas2, stlbe->mas3, stlbe->mas7,
- handler);
-}
-
static void kvmppc_e500_tlb1_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
- gva_t eaddr, gva_t eend, u32 tid)
+ int esel)
{
- unsigned int pid = tid & 0xff;
+ struct tlbe stlbe;
unsigned int i;
- /* XXX Replace loop with fancy data structures. */
- for (i = 0; i < vcpu_e500->guest_tlb_size[1]; i++) {
- struct tlbe *stlbe = &vcpu_e500->shadow_tlb[1][i];
- unsigned int tid;
-
- if (!get_tlb_v(stlbe))
- continue;
-
- if (eend < get_tlb_eaddr(stlbe))
- continue;
-
- if (eaddr > get_tlb_end(stlbe))
- continue;
+ stlbe.mas1 = 0;
+ for (i = 0; i < KVM_E500_TLB1_SIZE; i++) {
+ struct kvmppc_e500_shadow_ref *ref =
+ &vcpu_e500->shadow_refs[1][i];
- tid = get_tlb_tid(stlbe);
- if (tid && (tid != pid))
- continue;
-
- kvmppc_e500_stlbe_invalidate(vcpu_e500, 1, i);
- write_host_tlbe(vcpu_e500, 1, i);
+ if (ref->gtlbe == &vcpu_e500->guest_tlb[1][esel])
+ write_host_tlbe(vcpu_e500, 1, i, &stlbe);
}
}
@@ -285,14 +235,29 @@ static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
vcpu_e500->mas7 = 0;
}
+static inline void kvmppc_e500_setup_stlbe(struct kvmppc_vcpu_e500 *vcpu_e500,
+ struct tlbe *gtlbe, struct kvmppc_e500_shadow_ref *ref,
+ u64 gvaddr, struct tlbe *stlbe)
+{
+ hpa_t hpaddr = page_to_phys(ref->page);
+
+ /* Force TS=1 IPROT=0 TSIZE=4KB for all guest mappings. */
+ stlbe->mas1 = MAS1_TSIZE(BOOKE_PAGESZ_4K)
+ | MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID;
+ stlbe->mas2 = (gvaddr & MAS2_EPN)
+ | e500_shadow_mas2_attrib(gtlbe->mas2,
+ vcpu_e500->vcpu.arch.msr & MSR_PR);
+ stlbe->mas3 = (hpaddr & MAS3_RPN)
+ | e500_shadow_mas3_attrib(gtlbe->mas3,
+ vcpu_e500->vcpu.arch.msr & MSR_PR);
+ stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN;
+}
+
static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
- u64 gvaddr, gfn_t gfn, struct tlbe *gtlbe, int tlbsel, int esel)
+ gfn_t gfn, struct tlbe *gtlbe, int stlbsel, int sesel)
{
struct page *new_page;
- struct tlbe *stlbe;
- hpa_t hpaddr;
-
- stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
+ struct kvmppc_e500_shadow_ref *ref;
/* Get reference to new page. */
new_page = gfn_to_page(vcpu_e500->vcpu.kvm, gfn);
@@ -301,40 +266,24 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
kvm_release_page_clean(new_page);
return;
}
- hpaddr = page_to_phys(new_page);
/* Drop reference to old page. */
- kvmppc_e500_shadow_release(vcpu_e500, tlbsel, esel);
-
- vcpu_e500->shadow_pages[tlbsel][esel] = new_page;
+ kvmppc_e500_shadow_release(vcpu_e500, stlbsel, sesel);
- /* Force TS=1 IPROT=0 TSIZE=4KB for all guest mappings. */
- stlbe->mas1 = MAS1_TSIZE(BOOKE_PAGESZ_4K)
- | MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID;
- stlbe->mas2 = (gvaddr & MAS2_EPN)
- | e500_shadow_mas2_attrib(gtlbe->mas2,
- vcpu_e500->vcpu.arch.msr & MSR_PR);
- stlbe->mas3 = (hpaddr & MAS3_RPN)
- | e500_shadow_mas3_attrib(gtlbe->mas3,
- vcpu_e500->vcpu.arch.msr & MSR_PR);
- stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN;
-
- KVMTRACE_5D(STLB_WRITE, &vcpu_e500->vcpu, index_of(tlbsel, esel),
- stlbe->mas1, stlbe->mas2, stlbe->mas3, stlbe->mas7,
- handler);
+ ref = &vcpu_e500->shadow_refs[stlbsel][sesel];
+ ref->page = new_page;
+ ref->gtlbe = gtlbe;
}
/* XXX only map the one-one case, for now use TLB0 */
-static int kvmppc_e500_stlbe_map(struct kvmppc_vcpu_e500 *vcpu_e500,
- int tlbsel, int esel)
+static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, int esel)
{
struct tlbe *gtlbe;
- gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
+ gtlbe = &vcpu_e500->guest_tlb[0][esel];
- kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe),
- get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
- gtlbe, tlbsel, esel);
+ kvmppc_e500_shadow_map(vcpu_e500, get_tlb_raddr(gtlbe) >> PAGE_SHIFT,
+ gtlbe, 0, esel);
return esel;
}
@@ -352,7 +301,7 @@ static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
if (unlikely(vcpu_e500->guest_tlb_nv[1] >= tlb1_max_shadow_size()))
vcpu_e500->guest_tlb_nv[1] = 0;
- kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, victim);
+ kvmppc_e500_shadow_map(vcpu_e500, gfn, gtlbe, 1, victim);
return victim;
}
@@ -363,33 +312,19 @@ static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500,
void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode)
{
if (usermode) {
- struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
- int i;
-
- /* XXX Replace loop with fancy data structures. */
- for (i = 0; i < tlb1_max_shadow_size(); i++)
- kvmppc_e500_stlbe_invalidate(vcpu_e500, 1, i);
-
_tlbil_all();
}
}
-static int kvmppc_e500_gtlbe_invalidate(struct kvmppc_vcpu_e500 *vcpu_e500,
- int tlbsel, int esel)
+static inline int kvmppc_e500_gtlbe_invalidate(
+ struct kvmppc_vcpu_e500 *vcpu_e500,
+ int tlbsel, int esel)
{
struct tlbe *gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
if (unlikely(get_tlb_iprot(gtlbe)))
return -1;
- if (tlbsel == 1) {
- kvmppc_e500_tlb1_invalidate(vcpu_e500, get_tlb_eaddr(gtlbe),
- get_tlb_end(gtlbe),
- get_tlb_tid(gtlbe));
- } else {
- kvmppc_e500_stlbe_invalidate(vcpu_e500, tlbsel, esel);
- }
-
gtlbe->mas1 = 0;
return 0;
@@ -512,23 +447,16 @@ int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
- u64 eaddr;
- u64 raddr;
- u32 tid;
struct tlbe *gtlbe;
- int tlbsel, esel, stlbsel, sesel;
+ int tlbsel, esel;
tlbsel = get_tlb_tlbsel(vcpu_e500);
esel = get_tlb_esel(vcpu_e500, tlbsel);
gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
- if (get_tlb_v(gtlbe) && tlbsel == 1) {
- eaddr = get_tlb_eaddr(gtlbe);
- tid = get_tlb_tid(gtlbe);
- kvmppc_e500_tlb1_invalidate(vcpu_e500, eaddr,
- get_tlb_end(gtlbe), tid);
- }
+ if (get_tlb_v(gtlbe) && tlbsel == 1)
+ kvmppc_e500_tlb1_invalidate(vcpu_e500, esel);
gtlbe->mas1 = vcpu_e500->mas1;
gtlbe->mas2 = vcpu_e500->mas2;
@@ -541,35 +469,36 @@ int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
if (tlbe_is_host_safe(vcpu, gtlbe)) {
+ struct tlbe stlbe;
+ int stlbsel, sesel;
+ struct kvmppc_e500_shadow_ref *ref;
+ u64 eaddr;
+
switch (tlbsel) {
case 0:
/* TLB0 */
gtlbe->mas1 &= ~MAS1_TSIZE(~0);
gtlbe->mas1 |= MAS1_TSIZE(BOOKE_PAGESZ_4K);
+ eaddr = get_tlb_eaddr(gtlbe);
stlbsel = 0;
- sesel = kvmppc_e500_stlbe_map(vcpu_e500, 0, esel);
+ sesel = kvmppc_e500_tlb0_map(vcpu_e500, esel);
+ ref = &vcpu_e500->shadow_refs[stlbsel][sesel];
+
+ kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe,
+ ref, eaddr, &stlbe);
+ write_host_tlbe(vcpu_e500, stlbsel, sesel, &stlbe);
break;
case 1:
- /* TLB1 */
- eaddr = get_tlb_eaddr(gtlbe);
- raddr = get_tlb_raddr(gtlbe);
-
- /* Create a 4KB mapping on the host.
- * If the guest wanted a large page,
- * only the first 4KB is mapped here and the rest
- * are mapped on the fly. */
- stlbsel = 1;
- sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr,
- raddr >> PAGE_SHIFT, gtlbe);
+ /* Large page breaks into 4KB pages.
+ * And all these 4KB pages will be mapped on the fly. */
break;
default:
BUG();
}
- write_host_tlbe(vcpu_e500, stlbsel, sesel);
}
return EMULATE_DONE;
@@ -617,11 +546,11 @@ gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
- int tlbsel, i;
+ int stlbsel, i;
- for (tlbsel = 0; tlbsel < 2; tlbsel++)
- for (i = 0; i < vcpu_e500->guest_tlb_size[tlbsel]; i++)
- kvmppc_e500_shadow_release(vcpu_e500, tlbsel, i);
+ for (stlbsel = 0; stlbsel < 2; stlbsel++)
+ for (i = 0; i < vcpu_e500->guest_tlb_size[stlbsel]; i++)
+ kvmppc_e500_shadow_release(vcpu_e500, stlbsel, i);
/* discard all guest mapping */
_tlbil_all();
@@ -631,10 +560,14 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
unsigned int index)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
+ struct kvmppc_e500_shadow_ref *ref;
+ struct tlbe *gtlbe, stlbe;
int tlbsel = tlbsel_of(index);
int esel = esel_of(index);
int stlbsel, sesel;
+ gtlbe = &vcpu_e500->guest_tlb[tlbsel][esel];
+
switch (tlbsel) {
case 0:
stlbsel = 0;
@@ -643,8 +576,6 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
case 1: {
gfn_t gfn = gpaddr >> PAGE_SHIFT;
- struct tlbe *gtlbe
- = &vcpu_e500->guest_tlb[tlbsel][esel];
stlbsel = 1;
sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe);
@@ -655,7 +586,11 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
BUG();
break;
}
- write_host_tlbe(vcpu_e500, stlbsel, sesel);
+
+ ref = &vcpu_e500->shadow_refs[stlbsel][sesel];
+
+ kvmppc_e500_setup_stlbe(vcpu_e500, gtlbe, ref, eaddr, &stlbe);
+ write_host_tlbe(vcpu_e500, stlbsel, sesel, &stlbe);
}
int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
@@ -702,44 +637,28 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
if (vcpu_e500->guest_tlb[0] == NULL)
goto err_out;
- vcpu_e500->shadow_tlb_size[0] = KVM_E500_TLB0_SIZE;
- vcpu_e500->shadow_tlb[0] =
- kzalloc(sizeof(struct tlbe) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
- if (vcpu_e500->shadow_tlb[0] == NULL)
- goto err_out_guest0;
-
vcpu_e500->guest_tlb_size[1] = KVM_E500_TLB1_SIZE;
vcpu_e500->guest_tlb[1] =
kzalloc(sizeof(struct tlbe) * KVM_E500_TLB1_SIZE, GFP_KERNEL);
if (vcpu_e500->guest_tlb[1] == NULL)
- goto err_out_shadow0;
+ goto err_out_guest0;
- vcpu_e500->shadow_tlb_size[1] = tlb1_entry_num;
- vcpu_e500->shadow_tlb[1] =
- kzalloc(sizeof(struct tlbe) * tlb1_entry_num, GFP_KERNEL);
- if (vcpu_e500->shadow_tlb[1] == NULL)
+ vcpu_e500->shadow_refs[0] = (struct kvmppc_e500_shadow_ref *)
+ kzalloc(sizeof(struct kvmppc_e500_shadow_ref) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
+ if (vcpu_e500->shadow_refs[0] == NULL)
goto err_out_guest1;
- vcpu_e500->shadow_pages[0] = (struct page **)
- kzalloc(sizeof(struct page *) * KVM_E500_TLB0_SIZE, GFP_KERNEL);
- if (vcpu_e500->shadow_pages[0] == NULL)
- goto err_out_shadow1;
-
- vcpu_e500->shadow_pages[1] = (struct page **)
- kzalloc(sizeof(struct page *) * tlb1_entry_num, GFP_KERNEL);
- if (vcpu_e500->shadow_pages[1] == NULL)
- goto err_out_page0;
+ vcpu_e500->shadow_refs[1] = (struct kvmppc_e500_shadow_ref *)
+ kzalloc(sizeof(struct kvmppc_e500_shadow_ref) * KVM_E500_TLB1_SIZE, GFP_KERNEL);
+ if (vcpu_e500->shadow_refs[1] == NULL)
+ goto err_out_ref0;
return 0;
-err_out_page0:
- kfree(vcpu_e500->shadow_pages[0]);
-err_out_shadow1:
- kfree(vcpu_e500->shadow_tlb[1]);
+err_out_ref0:
+ kfree(vcpu_e500->shadow_refs[0]);
err_out_guest1:
kfree(vcpu_e500->guest_tlb[1]);
-err_out_shadow0:
- kfree(vcpu_e500->shadow_tlb[0]);
err_out_guest0:
kfree(vcpu_e500->guest_tlb[0]);
err_out:
@@ -748,10 +667,8 @@ err_out:
void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *vcpu_e500)
{
- kfree(vcpu_e500->shadow_pages[1]);
- kfree(vcpu_e500->shadow_pages[0]);
- kfree(vcpu_e500->shadow_tlb[1]);
+ kfree(vcpu_e500->shadow_refs[1]);
+ kfree(vcpu_e500->shadow_refs[0]);
kfree(vcpu_e500->guest_tlb[1]);
- kfree(vcpu_e500->shadow_tlb[0]);
kfree(vcpu_e500->guest_tlb[0]);
}
--
1.5.4
--
To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
