|
 |
9ae3a8 |
From 7212bc6c8e9b4a3118e1cc90157c2f123198139e Mon Sep 17 00:00:00 2001
|
|
|
9ae3a8 |
From: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
9ae3a8 |
Date: Thu, 16 Jan 2014 10:25:57 +0100
|
|
|
9ae3a8 |
Subject: [PATCH 02/14] pc_piix: document gigabyte_align
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
RH-Author: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
9ae3a8 |
Message-id: <1389867959-12463-3-git-send-email-kraxel@redhat.com>
|
|
|
9ae3a8 |
Patchwork-id: 56745
|
|
|
9ae3a8 |
O-Subject: [RHEL-7 qemu-kvm PATCH 2/4] pc_piix: document gigabyte_align
|
|
|
9ae3a8 |
Bugzilla: 1026548
|
|
|
9ae3a8 |
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
|
|
|
9ae3a8 |
RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
|
|
|
9ae3a8 |
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
From: "Michael S. Tsirkin" <mst@redhat.com>
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Document the logic behind the below/above 4G split.
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
|
9ae3a8 |
(cherry picked from commit ecdbfceb0f20a3ef784bf522ed7264660aa3d150)
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Conflicts:
|
|
|
9ae3a8 |
hw/i386/pc_piix.c
|
|
|
9ae3a8 |
---
|
|
|
9ae3a8 |
hw/i386/pc_piix.c | 11 +++++++++++
|
|
|
9ae3a8 |
1 file changed, 11 insertions(+)
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
9ae3a8 |
---
|
|
|
9ae3a8 |
hw/i386/pc_piix.c | 11 +++++++++++
|
|
|
9ae3a8 |
1 files changed, 11 insertions(+), 0 deletions(-)
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
|
|
|
9ae3a8 |
index 9f1d0b5..12351f9 100644
|
|
|
9ae3a8 |
--- a/hw/i386/pc_piix.c
|
|
|
9ae3a8 |
+++ b/hw/i386/pc_piix.c
|
|
|
9ae3a8 |
@@ -61,6 +61,10 @@ static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
|
|
|
9ae3a8 |
static bool smbios_type1_defaults = true;
|
|
|
9ae3a8 |
static bool has_pci_info;
|
|
|
9ae3a8 |
static bool has_acpi_build = true;
|
|
|
9ae3a8 |
+/* Make sure that guest addresses aligned at 1Gbyte boundaries get mapped to
|
|
|
9ae3a8 |
+ * host addresses aligned at 1Gbyte boundaries. This way we can use 1GByte
|
|
|
9ae3a8 |
+ * pages in the host.
|
|
|
9ae3a8 |
+ */
|
|
|
9ae3a8 |
static bool gigabyte_align = true;
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
/* PC hardware initialisation */
|
|
|
9ae3a8 |
@@ -102,6 +106,13 @@ static void pc_init1(QEMUMachineInitArgs *args,
|
|
|
9ae3a8 |
kvmclock_create();
|
|
|
9ae3a8 |
}
|
|
|
9ae3a8 |
|
|
|
9ae3a8 |
+ /* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory).
|
|
|
9ae3a8 |
+ * If it doesn't, we need to split it in chunks below and above 4G.
|
|
|
9ae3a8 |
+ * In any case, try to make sure that guest addresses aligned at
|
|
|
9ae3a8 |
+ * 1G boundaries get mapped to host addresses aligned at 1G boundaries.
|
|
|
9ae3a8 |
+ * For old machine types, use whatever split we used historically to avoid
|
|
|
9ae3a8 |
+ * breaking migration.
|
|
|
9ae3a8 |
+ */
|
|
|
9ae3a8 |
if (args->ram_size >= 0xe0000000) {
|
|
|
9ae3a8 |
ram_addr_t lowmem = gigabyte_align ? 0xc0000000 : 0xe0000000;
|
|
|
9ae3a8 |
above_4g_mem_size = args->ram_size - lowmem;
|
|
|
9ae3a8 |
--
|
|
|
9ae3a8 |
1.7.1
|
|
|
9ae3a8 |
|