* [RFC PATCH v3 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
@ 2020-02-12 22:31 Anchal Agarwal
0 siblings, 0 replies; 2+ messages in thread
From: Anchal Agarwal @ 2020-02-12 22:31 UTC (permalink / raw)
To: tglx, mingo, bp, hpa, x86, boris.ostrovsky, jgross, linux-pm,
linux-mm, kamatam, sstabellini, konrad.wilk, roger.pau, axboe,
davem, rjw, len.brown, pavel, peterz, eduval, sblbir, anchalag,
xen-devel, vkuznets, netdev, linux-kernel, dwmw, fllinden, benh
Introduce a small function which re-uses shared page's PA allocated
during guest initialization time in reserve_shared_info() and not
allocate new page during resume flow.
It also does the mapping of shared_info_page by calling
xen_hvm_init_shared_info() to use the function.
Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
---
Changes since V2: None
---
arch/x86/xen/enlighten_hvm.c | 7 +++++++
arch/x86/xen/xen-ops.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index e138f7de52d2..75b1ec7a0fcd 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -27,6 +27,13 @@
static unsigned long shared_info_pfn;
+void xen_hvm_map_shared_info(void)
+{
+ xen_hvm_init_shared_info();
+ if (shared_info_pfn)
+ HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
+}
+
void xen_hvm_init_shared_info(void)
{
struct xen_add_to_physmap xatp;
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 45a441c33d6d..d84c357994bd 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -56,6 +56,7 @@ void xen_enable_syscall(void);
void xen_vcpu_restore(void);
void xen_callback_vector(void);
+void xen_hvm_map_shared_info(void);
void xen_hvm_init_shared_info(void);
void xen_unplug_emulated_devices(void);
--
2.24.1.AMZN
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [RFC PATCH v3 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
2020-02-14 23:21 [RFC RESEND PATCH v3 00/12] Enable PM hibernation on guest VMs Anchal Agarwal
@ 2020-02-14 23:23 ` Anchal Agarwal
0 siblings, 0 replies; 2+ messages in thread
From: Anchal Agarwal @ 2020-02-14 23:23 UTC (permalink / raw)
To: tglx, mingo, bp, hpa, x86, boris.ostrovsky, jgross, linux-pm,
linux-mm, kamatam, sstabellini, konrad.wilk, roger.pau, axboe,
davem, rjw, len.brown, pavel, peterz, eduval, sblbir, anchalag,
xen-devel, vkuznets, netdev, linux-kernel, dwmw, fllinden, benh
Introduce a small function which re-uses shared page's PA allocated
during guest initialization time in reserve_shared_info() and not
allocate new page during resume flow.
It also does the mapping of shared_info_page by calling
xen_hvm_init_shared_info() to use the function.
Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
---
arch/x86/xen/enlighten_hvm.c | 7 +++++++
arch/x86/xen/xen-ops.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index e138f7de52d2..75b1ec7a0fcd 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -27,6 +27,13 @@
static unsigned long shared_info_pfn;
+void xen_hvm_map_shared_info(void)
+{
+ xen_hvm_init_shared_info();
+ if (shared_info_pfn)
+ HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
+}
+
void xen_hvm_init_shared_info(void)
{
struct xen_add_to_physmap xatp;
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 45a441c33d6d..d84c357994bd 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -56,6 +56,7 @@ void xen_enable_syscall(void);
void xen_vcpu_restore(void);
void xen_callback_vector(void);
+void xen_hvm_map_shared_info(void);
void xen_hvm_init_shared_info(void);
void xen_unplug_emulated_devices(void);
--
2.24.1.AMZN
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-02-14 23:24 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2020-02-12 22:31 [RFC PATCH v3 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
2020-02-14 23:21 [RFC RESEND PATCH v3 00/12] Enable PM hibernation on guest VMs Anchal Agarwal
2020-02-14 23:23 ` [RFC PATCH v3 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
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