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From 1c7fad3776a14ca35b24dc2fdb262d4ddf40d6eb Mon Sep 17 00:00:00 2001
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From: Gavin Shan <gshan@redhat.com>
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Date: Wed, 21 Dec 2022 08:48:45 +0800
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Subject: [PATCH 5/8] hw/arm/virt: Improve high memory region address
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assignment
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RH-Author: Gavin Shan <gshan@redhat.com>
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RH-MergeRequest: 126: hw/arm/virt: Optimize high memory region address assignment
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RH-Bugzilla: 2113840
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [5/8] 4d77fa78b5258a1bd8d30405cec5ba3311d42f92
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2113840
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There are three high memory regions, which are VIRT_HIGH_REDIST2,
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VIRT_HIGH_PCIE_ECAM and VIRT_HIGH_PCIE_MMIO. Their base addresses
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are floating on highest RAM address. However, they can be disabled
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in several cases.
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(1) One specific high memory region is likely to be disabled by
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code by toggling vms->highmem_{redists, ecam, mmio}.
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(2) VIRT_HIGH_PCIE_ECAM region is disabled on machine, which is
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'virt-2.12' or ealier than it.
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(3) VIRT_HIGH_PCIE_ECAM region is disabled when firmware is loaded
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on 32-bits system.
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(4) One specific high memory region is disabled when it breaks the
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PA space limit.
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The current implementation of virt_set_{memmap, high_memmap}() isn't
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optimized because the high memory region's PA space is always reserved,
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regardless of whatever the actual state in the corresponding
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vms->highmem_{redists, ecam, mmio} flag. In the code, 'base' and
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'vms->highest_gpa' are always increased for case (1), (2) and (3).
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It's unnecessary since the assigned PA space for the disabled high
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memory region won't be used afterwards.
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Improve the address assignment for those three high memory region by
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skipping the address assignment for one specific high memory region if
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it has been disabled in case (1), (2) and (3). The memory layout may
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be changed after the improvement is applied, which leads to potential
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migration breakage. So 'vms->highmem_compact' is added to control if
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the improvement should be applied. For now, 'vms->highmem_compact' is
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set to false, meaning that we don't have memory layout change until it
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becomes configurable through property 'compact-highmem' in next patch.
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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Reviewed-by: Marc Zyngier <maz@kernel.org>
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Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
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Message-id: 20221029224307.138822-6-gshan@redhat.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit 4a4ff9edc6a8fdc76082af5b41b059217138c09b)
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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---
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hw/arm/virt.c | 15 ++++++++++-----
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include/hw/arm/virt.h | 1 +
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2 files changed, 11 insertions(+), 5 deletions(-)
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diff --git a/hw/arm/virt.c b/hw/arm/virt.c
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index 6e3b9fc060..6896e0ca0f 100644
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--- a/hw/arm/virt.c
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+++ b/hw/arm/virt.c
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@@ -1768,18 +1768,23 @@ static void virt_set_high_memmap(VirtMachineState *vms,
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vms->memmap[i].size = region_size;
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/*
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- * Check each device to see if they fit in the PA space,
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- * moving highest_gpa as we go.
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+ * Check each device to see if it fits in the PA space,
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+ * moving highest_gpa as we go. For compatibility, move
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+ * highest_gpa for disabled fitting devices as well, if
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+ * the compact layout has been disabled.
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*
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* For each device that doesn't fit, disable it.
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*/
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fits = (region_base + region_size) <= BIT_ULL(pa_bits);
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- if (fits) {
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- vms->highest_gpa = region_base + region_size - 1;
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+ *region_enabled &= fits;
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+ if (vms->highmem_compact && !*region_enabled) {
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+ continue;
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}
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- *region_enabled &= fits;
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base = region_base + region_size;
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+ if (fits) {
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+ vms->highest_gpa = base - 1;
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+ }
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}
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}
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diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
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index 22b54ec510..15bd291311 100644
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--- a/include/hw/arm/virt.h
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+++ b/include/hw/arm/virt.h
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@@ -144,6 +144,7 @@ struct VirtMachineState {
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PFlashCFI01 *flash[2];
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bool secure;
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bool highmem;
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+ bool highmem_compact;
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bool highmem_ecam;
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bool highmem_mmio;
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bool highmem_redists;
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--
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2.31.1
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