linux-kernel - [GIT PULL] x86/hyperv change for v4.16

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Message-ID: <20180129112317.eyjtcpybpjvakkfx@gmail.com>
Date:   Mon, 29 Jan 2018 12:23:17 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] x86/hyperv change for v4.16

Linus,

Please pull the latest x86-hyperv-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-hyperv-for-linus

   # HEAD: 617ab45c9a8900e64a78b43696c02598b8cad68b x86/hyperv: Stop suppressing X86_FEATURE_PCID

Enable PCID support on Hyper-V guests.

 Thanks,

	Ingo

------------------>
Vitaly Kuznetsov (1):
      x86/hyperv: Stop suppressing X86_FEATURE_PCID


 arch/x86/hyperv/mmu.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index 9cc9e1c1e2db..56c9ebac946f 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -137,7 +137,12 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
 	}
 
 	if (info->mm) {
+		/*
+		 * AddressSpace argument must match the CR3 with PCID bits
+		 * stripped out.
+		 */
 		flush->address_space = virt_to_phys(info->mm->pgd);
+		flush->address_space &= CR3_ADDR_MASK;
 		flush->flags = 0;
 	} else {
 		flush->address_space = 0;
@@ -219,7 +224,12 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
 	}
 
 	if (info->mm) {
+		/*
+		 * AddressSpace argument must match the CR3 with PCID bits
+		 * stripped out.
+		 */
 		flush->address_space = virt_to_phys(info->mm->pgd);
+		flush->address_space &= CR3_ADDR_MASK;
 		flush->flags = 0;
 	} else {
 		flush->address_space = 0;
@@ -278,8 +288,6 @@ void hyperv_setup_mmu_ops(void)
 	if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))
 		return;
 
-	setup_clear_cpu_cap(X86_FEATURE_PCID);
-
 	if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED)) {
 		pr_info("Using hypercall for remote TLB flush\n");
 		pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others;