linux-kernel - [PATCH v7 17/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap.

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Message-Id: <864a701c953f01ff12f97f4215512901b4d933ea.1588234824.git.ashish.kalra@amd.com>
Date:   Thu, 30 Apr 2020 08:47:01 +0000
From:   Ashish Kalra <Ashish.Kalra@....com>
To:     pbonzini@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        joro@...tes.org, bp@...e.de, thomas.lendacky@....com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        srutherford@...gle.com, rientjes@...gle.com,
        venu.busireddy@...cle.com, brijesh.singh@....com
Subject: [PATCH v7 17/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap.

From: Ashish Kalra <ashish.kalra@....com>

Ensure that _bss_decrypted section variables such as hv_clock_boot and
wall_clock are marked as decrypted in the page encryption bitmap if
sev liv migration is supported.

Signed-off-by: Ashish Kalra <ashish.kalra@....com>
---
 arch/x86/kernel/kvmclock.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 34b18f6eeb2c..65777bf1218d 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -334,6 +334,18 @@ void __init kvmclock_init(void)
 	pr_info("kvm-clock: Using msrs %x and %x",
 		msr_kvm_system_time, msr_kvm_wall_clock);
 
+	if (sev_live_migration_enabled()) {
+		unsigned long nr_pages;
+		/*
+		 * sizeof(hv_clock_boot) is already PAGE_SIZE aligned
+		 */
+		early_set_mem_enc_dec_hypercall((unsigned long)hv_clock_boot,
+						1, 0);
+		nr_pages = DIV_ROUND_UP(sizeof(wall_clock), PAGE_SIZE);
+		early_set_mem_enc_dec_hypercall((unsigned long)&wall_clock,
+						nr_pages, 0);
+	}
+
 	this_cpu_write(hv_clock_per_cpu, &hv_clock_boot[0]);
 	kvm_register_clock("primary cpu clock");
 	pvclock_set_pvti_cpu0_va(hv_clock_boot);
-- 
2.17.1